HotSpot VM Options for JDK10


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NameSinceTypeOSCPUComponentDefaultAvailabilityDescriptionDefined in
SinceTypeOSCPUComponentAvailability
AOTLibraryJDK9ccstrlistNULLproductAOT libraryshare/runtime/globals.hpp
AbortVMOnExceptionMessageJDK6ccstrNULLdiagnosticCall fatal if the exception pointed by AbortVMOnException has this messageshare/runtime/globals.hpp
AbortVMOnExceptionJDK6ccstrNULLdiagnosticCall fatal if this exception is thrown.Example: java -XX:AbortVMOnException=java.lang.NullPointerException Fooshare/runtime/globals.hpp
ActiveProcessorCountJDK10int-1productSpecify the CPU count the VM should use and report as activeshare/runtime/globals.hpp
AdaptiveSizeDecrementScaleFactorJDK6uintx4
range(1, max_uintx)
productAdaptive size scale down factor for shrinkingshare/runtime/globals.hpp
AdaptiveSizeMajorGCDecayTimeScaleJDK6uintx10
range(0, max_uintx)
productTime scale over which major costs decayshare/runtime/globals.hpp
AdaptiveSizePolicyCollectionCostMarginJDK6uintx50
range(0, 100)
productIf collection costs are within margin, reduce both by full deltashare/runtime/globals.hpp
AdaptiveSizePolicyGCTimeLimitThresholdJDK6uintx5
range(1, max_uintx)
developNumber of consecutive collections before gc time limit firesshare/runtime/globals.hpp
AdaptiveSizePolicyInitializingStepsJDK6uintx20
range(0, max_uintx)
productNumber of steps where heuristics is used before data is usedshare/runtime/globals.hpp
AdaptiveSizePolicyOutputIntervalJDK6uintx0
range(0, max_uintx)
productCollection interval for printing information; zero means nevershare/runtime/globals.hpp
AdaptiveSizePolicyReadyThresholdJDK6uintx5developNumber of collections before the adaptive sizing is startedshare/runtime/globals.hpp
AdaptiveSizePolicyWeightJDK6uintx10
range(0, 100)
productWeight given to exponential resizing, between 0 and 100share/runtime/globals.hpp
AdaptiveSizeThroughPutPolicyJDK6uintx0
range(0, 1)
productPolicy for changing generation size for throughput goalsshare/runtime/globals.hpp
AdaptiveTimeWeightJDK6uintx25
range(0, 100)
productWeight given to time in adaptive policy, between 0 and 100share/runtime/globals.hpp
AggressiveHeapJDK10boolfalseproductOptimize heap options for long-running memory intensive appsshare/runtime/globals.hpp
AggressiveOptsJDK6boolfalseproductEnable aggressive optimizations - see arguments.cppshare/runtime/globals.hpp
AggressiveUnboxingJDK8boolfalseexperimentalControl optimizations for aggressive boxing eliminationshare/opto/c2_globals.hpp
AliasLevelJDK6intx3
range(0, 3)
product0 for no aliasing, 1 for oop/field/static/array split, 2 for class split, 3 for unique instancesshare/opto/c2_globals.hpp
AlignVectorJDK8booltrueproductPerform vector store/load alignment in loopshare/opto/c2_globals.hpp
AllocateHeapAtJDK10ccstrNULLproductPath to the directoy where a temporary file will be created to use as the backing store for Java Heap.share/runtime/globals.hpp
AllocateInstancePrefetchLinesJDK6intx1
range(1, 64)
productNumber of lines to prefetch ahead of instance allocation pointershare/runtime/globals.hpp
AllocatePrefetchDistanceJDK6intx-1productDistance to prefetch ahead of allocation pointer. -1: use system-specific value (automatically determinedshare/runtime/globals.hpp
AllocatePrefetchInstrJDK6intx0productSelect instruction to prefetch ahead of allocation pointershare/runtime/globals.hpp
AllocatePrefetchLinesJDK6intx3
range(1, 64)
productNumber of lines to prefetch ahead of array allocation pointershare/runtime/globals.hpp
AllocatePrefetchStepSizeJDK6intx16
range(1, 512)
productStep size in bytes of sequential prefetch instructionsshare/runtime/globals.hpp
AllocatePrefetchStyleJDK6intx1
range(0, 3)
product0 = no prefetch, 1 = generate prefetch instructions for each allocation, 2 = use TLAB watermark to gate allocation prefetch, 3 = generate one prefetch instruction per cache lineshare/runtime/globals.hpp
AllowExtshmJDK9boolaixfalseproductAllow VM to run with EXTSHM=ON.os/aix/globals_aix.hpp
AllowJNIEnvProxyJDK6boolfalseproductAllow JNIEnv proxies for jdbxshare/runtime/globals.hpp
AllowNonVirtualCallsJDK6boolfalseproductObey the ACC_SUPER flag and allow invokenonvirtual callsshare/runtime/globals.hpp
AllowParallelDefineClassJDK6boolfalseproductAllow parallel defineClass requests for class loaders registering as parallel capableshare/runtime/globals.hpp
AllowUserSignalHandlersJDK6boolfalseproductDo not complain if the application installs signal handlers (Solaris & Linux only)share/runtime/globals.hpp
AllowVectorizeOnDemandJDK9booltrueproductGlobally supress vectorization set in VectorizeMethodshare/opto/c2_globals.hpp
AlwaysActAsServerClassMachineJDK6boolfalseproductAlways act like a server-class machineshare/runtime/globals.hpp
AlwaysAtomicAccessesJDK9boolfalseexperimentalAccesses to all variables should always be atomicshare/runtime/globals.hpp
AlwaysCompileLoopMethodsJDK6boolfalseproductWhen using recompilation, never interpret methods containing loopsshare/runtime/globals.hpp
AlwaysIncrementalInlineJDK8boolfalsedevelopdo all inlining incrementallyshare/opto/c2_globals.hpp
AlwaysLockClassLoaderJDK6boolfalseproductRequire the VM to acquire the class loader lock before calling loadClass() even for class loaders registering as parallel capableshare/runtime/globals.hpp
AlwaysPreTouchJDK6boolfalseproductForce all freshly committed pages to be pre-touchedshare/runtime/globals.hpp
AlwaysRestoreFPUJDK6boolfalseproductRestore the FPU control word after every JNI call (expensive)share/runtime/globals.hpp
AlwaysSafeConstructorsJDK9boolfalseexperimentalForce safe construction, as if all fields are final.share/runtime/globals.hpp
AlwaysTenureJDK6boolfalseproductAlways tenure objects in eden (ParallelGC only)share/runtime/globals.hpp
ArrayAllocatorMallocLimitJDK8size_tSOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1)experimentalAllocation less than this value will be allocated using malloc. Larger allocations will use mmap.share/runtime/globals.hpp
ArrayCopyLoadStoreMaxElemJDK9intx8
range(0, max_intx)
productMaximum number of arraycopy elements inlined as a sequence ofloads/storesshare/opto/c2_globals.hpp
ArraycopyDstPrefetchDistanceJDK6uintxsparc0productDistance to prefetch destination array in arraycopycpu/sparc/globals_sparc.hpp
ArraycopySrcPrefetchDistanceJDK6uintxsparc0productDistance to prefetch source array in arraycopycpu/sparc/globals_sparc.hpp
AssertOnSuspendWaitFailureJDK6boolfalseproductAssert/Guarantee on external suspend wait failureshare/runtime/globals.hpp
AssertRangeCheckEliminationJDK8boolfalsedevelopAssert Range Check Eliminationshare/c1/c1_globals.hpp
AssumeMPJDK8booltrueproduct(Deprecated) Instruct the VM to assume multiple processors are availableshare/runtime/globals.hpp
AttachListenerTimeoutJDK8intxaix1000
range(0, 2147483)
productTimeout in ms the attach listener waits for a requestos/aix/globals_aix.hpp
AutoBoxCacheMaxJDK6intx128
range(0, max_jint)
productSets max value cached by the java.lang.Integer autobox cacheshare/opto/c2_globals.hpp
AvoidUnalignedAccessesJDK9boolaarch64falseproductAvoid generating unaligned memory accessescpu/aarch64/globals_aarch64.hpp
BCEATraceLevelJDK6intx0
range(0, 3)
productHow much tracing to do of bytecode escape analysis estimates (0-3)share/runtime/globals.hpp
BackgroundCompilationJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
BackgroundCompilationJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
BackgroundCompilationJDK6boolnullproduct_pdA thread requesting compilation is not blocked during compilationshare/runtime/globals.hpp
BackgroundCompilationJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
BackgroundCompilationJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
BackgroundCompilationJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
BackgroundCompilationJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
BailoutAfterHIRJDK6boolfalsedevelopbailout of compilation after building of HIRshare/c1/c1_globals.hpp
BailoutAfterLIRJDK6boolfalsedevelopbailout of compilation after building of LIRshare/c1/c1_globals.hpp
BailoutOnExceptionHandlersJDK6boolfalsedevelopbailout of compilation for methods with exception handlersshare/c1/c1_globals.hpp
BailoutToInterpreterForThrowsJDK6boolfalsedevelopCompiled methods which throws/catches exceptions will be deopt and intp.share/opto/c2_globals.hpp
BaseFootPrintEstimateJDK6size_t256*M
range(0, max_uintx)
productEstimate of footprint other than Java Heapshare/runtime/globals.hpp
BciProfileWidthJDK6intx2developNumber of return bci's to record in ret profileshare/runtime/globals.hpp
BiasedLockingBulkRebiasThresholdJDK6intx20
range(0, max_intx)
productThreshold of number of revocations per type to try to rebias all objects in the heap of that typeshare/runtime/globals.hpp
BiasedLockingBulkRevokeThresholdJDK6intx40
range(0, max_intx)
productThreshold of number of revocations per type to permanently revoke biases of all objects in the heap of that typeshare/runtime/globals.hpp
BiasedLockingDecayTimeJDK6intx25000
range(500, max_intx)
productDecay time (in milliseconds) to re-enable bulk rebiasing of a type after previous bulk rebiasshare/runtime/globals.hpp
BiasedLockingStartupDelayJDK6intx0
range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran)))
productNumber of milliseconds to wait before enabling biased lockingshare/runtime/globals.hpp
BinarySwitchThresholdJDK6intx5developMinimal number of lookupswitch entries for rewriting to binary switchshare/runtime/globals.hpp
BindCMSThreadToCPUJDK6boolfalsediagnosticBind CMS Thread to CPU if possibleshare/runtime/globals.hpp
BindGCTaskThreadsToCPUsJDK6boolfalseproductBind GCTaskThreads to CPUs if possibleshare/runtime/globals.hpp
BlockCopyLowLimitJDK6intxsparc2048
range(1, max_jint)
productMinimum size in bytes when block copy will be usedcpu/sparc/globals_sparc.hpp
BlockLayoutByFrequencyJDK6booltrueproductUse edge frequencies to drive block orderingshare/opto/c2_globals.hpp
BlockLayoutMinDiamondPercentageJDK6intx20
range(0, 100)
productMiniumum %% of a successor (predecessor) for which block layout a will allow a fork (join) in a single chainshare/opto/c2_globals.hpp
BlockLayoutRotateLoopsJDK6booltrueproductAllow back branches to be fall throughs in the block layoutshare/opto/c2_globals.hpp
BlockOffsetArrayUseUnallocatedBlockJDK6boolfalsediagnosticMaintain _unallocated_block in BlockOffsetArray (currently applicable only to CMS collector)share/runtime/globals.hpp
BlockZeroingLowLimitJDK6intxaarch64256
range(1, max_jint)
productMinimum size in bytes when block zeroing will be usedcpu/aarch64/globals_aarch64.hpp
BlockZeroingLowLimitJDK6intxsparc2048
range(1, max_jint)
productMinimum size in bytes when block zeroing will be usedcpu/sparc/globals_sparc.hpp
BootstrapJVMCIJDK9boolfalseexperimentalBootstrap JVMCI before running Java main methodshare/jvmci/jvmci_globals.hpp
BranchOnRegisterJDK6boolfalseproductUse Sparc V9 branch-on-register opcodesshare/opto/c2_globals.hpp
BreakAtNodeJDK6intx0notproductBreak at construction of this Node (either _idx or _debug_idx)share/opto/c2_globals.hpp
BreakAtWarningJDK6boolfalsedevelopExecute breakpoint upon encountering VM warningshare/runtime/globals.hpp
BytecodeVerificationLocalJDK6boolfalseproductEnable the Java bytecode verifier for local classesshare/runtime/globals.hpp
BytecodeVerificationRemoteJDK6booltrueproductEnable the Java bytecode verifier for remote classesshare/runtime/globals.hpp
C1BreakpointJDK6boolfalsedevelopSets a breakpoint at entry of each compiled methodshare/c1/c1_globals.hpp
C1OptimizeVirtualCallProfilingJDK6booltrueproductUse CHA and exact type results at call sites when updating MDOsshare/c1/c1_globals.hpp
C1ProfileBranchesJDK6booltrueproductProfile branches when generating code for updating MDOsshare/c1/c1_globals.hpp
C1ProfileCallsJDK6booltrueproductProfile calls when generating code for updating MDOsshare/c1/c1_globals.hpp
C1ProfileCheckcastsJDK6booltrueproductProfile checkcasts when generating code for updating MDOsshare/c1/c1_globals.hpp
C1ProfileInlinedCallsJDK6booltrueproductProfile inlined calls when generating code for updating MDOsshare/c1/c1_globals.hpp
C1ProfileVirtualCallsJDK6booltrueproductProfile virtual calls when generating code for updating MDOsshare/c1/c1_globals.hpp
C1UpdateMethodDataJDK6booltrueInTieredproductUpdate MethodData*s in Tier1-generated codeshare/c1/c1_globals.hpp
CIBreakAtOSRJDK6intx-1developThe id of osr compilation to break atshare/runtime/globals.hpp
CIBreakAtJDK6intx-1developThe id of compilation to break atshare/runtime/globals.hpp
CICompileNativesJDK6booltruedevelopcompile native methods if supported by the compilershare/runtime/globals.hpp
CICompileOSRJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
CICompileOSRJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
CICompileOSRJDK6boolfalsedefine_pd_globalshare/runtime/globals.hpp
CICompileOSRJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
CICompileOSRJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
CICompileOSRJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
CICompileOSRJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
CICompilerCountPerCPUJDK6boolfalseproduct1 compiler thread for log(N CPUs)share/runtime/globals.hpp
CICompilerCountJDK6intxCI_COMPILER_COUNT
range(0, max_jint)
productNumber of compiler threads to runshare/runtime/globals.hpp
CICountOSRJDK6boolfalsedevelopuse a separate counter when assigning ids to osr compilationsshare/runtime/globals.hpp
CICrashAtJDK8intx-1notproductid of compilation to trigger assert in compiler thread for the purpose of testing, e.g. generation of replay datashare/runtime/globals.hpp
CIFireOOMAtJDK6intx-1developFire OutOfMemoryErrors throughout CI for testing the compiler (non-negative value throws OOM after this many CI accesses in each compile)share/runtime/globals.hpp
CIObjectFactoryVerifyJDK6boolfalsenotproductenable potentially expensive verification in ciObjectFactoryshare/runtime/globals.hpp
CIPrintCompileQueueJDK6boolfalsediagnosticdisplay the contents of the compile queue whenever a compilation is enqueuedshare/runtime/globals.hpp
CIPrintCompilerNameJDK6boolfalsedevelopwhen CIPrint is active, print the name of the active compilershare/runtime/globals.hpp
CIPrintMethodCodesJDK6boolfalsedevelopprint method bytecodes of the compiled codeshare/runtime/globals.hpp
CIPrintRequestsJDK6boolfalsedevelopdisplay every request for compilationshare/runtime/globals.hpp
CIPrintTypeFlowJDK6boolfalsedevelopprint the results of ciTypeFlow analysisshare/runtime/globals.hpp
CIStartOSRJDK6intx0developThe id of the first osr compilation to permit (CICountOSR must be on)share/runtime/globals.hpp
CIStartJDK6intx0developThe id of the first compilation to permitshare/runtime/globals.hpp
CIStopOSRJDK6intxmax_jintdevelopThe id of the last osr compilation to permit (CICountOSR must be on)share/runtime/globals.hpp
CIStopJDK6intxmax_jintdevelopThe id of the last compilation to permitshare/runtime/globals.hpp
CITimeEachJDK6boolfalsedevelopdisplay timing information after each successful compilationshare/runtime/globals.hpp
CITimeVerboseJDK9boolfalsedevelopbe more verbose in compilation timingsshare/runtime/globals.hpp
CITimeJDK6boolfalseproductcollect timing information for compilationshare/runtime/globals.hpp
CITraceTypeFlowJDK6boolfalsedevelopdetailed per-bytecode tracing of ciTypeFlow analysisshare/runtime/globals.hpp
CMSAbortSemanticsJDK6boolfalseproductWhether abort-on-overflow semantics is implementedshare/runtime/globals.hpp
CMSAbortablePrecleanMinWorkPerIterationJDK6uintx100
range(0, max_intx)
productNominal minimum work per abortable preclean iterationshare/runtime/globals.hpp
CMSBitMapYieldQuantumJDK6size_t10*M
range(1, max_uintx)
productBitmap operations should process at most this many bits between yieldsshare/runtime/globals.hpp
CMSBootstrapOccupancyJDK6uintx50
range(0, 100)
productPercentage CMS generation occupancy at which to initiate CMS collection for bootstrapping collection statsshare/runtime/globals.hpp
CMSCheckIntervalJDK8uintx1000developInterval in milliseconds that CMS thread checks if it should start a collection cycleshare/runtime/globals.hpp
CMSClassUnloadingEnabledJDK6booltrueproductWhether class unloading enabled when using CMS GCshare/runtime/globals.hpp
CMSClassUnloadingMaxIntervalJDK6uintx0
range(0, max_uintx)
productWhen CMS class unloading is enabled, the maximum CMS cycle count for which classes may not be unloadedshare/runtime/globals.hpp
CMSCleanOnEnterJDK6booltrueproductClean-on-enter optimization for reducing number of dirty cardsshare/runtime/globals.hpp
CMSConcMarkMultipleJDK6size_t32
range(1, SIZE_MAX / 4096)
productSize (in cards) of CMS concurrent MT marking taskshare/runtime/globals.hpp
CMSConcurrentMTEnabledJDK6booltrueproductWhether multi-threaded concurrent work enabled (effective only if ParNewGC)share/runtime/globals.hpp
CMSCoordinatorYieldSleepCountJDK6uintx10
range(0, max_juint)
productNumber of times the coordinator GC thread will sleep while yielding before giving up and resuming GCshare/runtime/globals.hpp
CMSEdenChunksRecordAlwaysJDK8booltrueproductAlways record eden chunks used for the parallel initial mark or remark of edenshare/runtime/globals.hpp
CMSExpAvgFactorJDK6uintx50
range(0, 100)
productPercentage (0-100) used to weight the current sample when computing exponential averages for CMS statisticsshare/runtime/globals.hpp
CMSExtrapolateSweepJDK6boolfalseproductCMS: cushion for block demand during sweepshare/runtime/globals.hpp
CMSIncrementalSafetyFactorJDK6uintx10
range(0, 100)
productPercentage (0-100) used to add conservatism when computing the duty cycleshare/runtime/globals.hpp
CMSIndexedFreeListReplenishJDK6uintx4
range(1, max_uintx)
productReplenish an indexed free list with this number of chunksshare/runtime/globals.hpp
CMSInitiatingOccupancyFractionJDK6intx-1
range(min_intx, 100)
productPercentage CMS generation occupancy to start a CMS collection cycle. A negative value means that CMSTriggerRatio is usedshare/runtime/globals.hpp
CMSIsTooFullPercentageJDK6uintx98
range(0, 100)
productAn absolute ceiling above which CMS will always consider the unloading of classes when class unloading is enabledshare/runtime/globals.hpp
CMSLargeCoalSurplusPercentJDK6double0.95
range(0.0, DBL_MAX)
productCMS: the factor by which to inflate estimated demand of large block sizes to prevent coalescing with an adjoining blockshare/runtime/globals.hpp
CMSLargeSplitSurplusPercentJDK6double1.00
range(0.0, DBL_MAX)
productCMS: the factor by which to inflate estimated demand of large block sizes to prevent splitting to supply demand for smaller blocksshare/runtime/globals.hpp
CMSLoopWarnJDK6boolfalseproductWarn in case of excessive CMS loopingshare/runtime/globals.hpp
CMSMarkStackOverflowALotJDK6boolfalsenotproductSimulate frequent marking stack / work queue overflowshare/runtime/globals.hpp
CMSMarkStackOverflowIntervalJDK6uintx1000notproductAn 'interval' counter that determines how frequently to simulate overflow; a smaller number increases frequencyshare/runtime/globals.hpp
CMSMaxAbortablePrecleanLoopsJDK6uintx0
range(0, max_uintx)
productMaximum number of abortable preclean iterations, if > 0share/runtime/globals.hpp
CMSMaxAbortablePrecleanTimeJDK6intx5000
range(0, max_intx)
productMaximum time in abortable preclean (in milliseconds)share/runtime/globals.hpp
CMSOldPLABMaxJDK6size_t1024
range(1, max_uintx)
productMaximum size of CMS gen promotion LAB caches per worker per block sizeshare/runtime/globals.hpp
CMSOldPLABMinJDK6size_t16
range(1, max_uintx)
productMinimum size of CMS gen promotion LAB caches per worker per block sizeshare/runtime/globals.hpp
CMSOldPLABNumRefillsJDK6uintx4
range(1, max_uintx)
productNominal number of refills of CMS gen promotion LAB cache per worker per block sizeshare/runtime/globals.hpp
CMSOldPLABReactivityFactorJDK6uintx2
range(1, max_uintx)
productThe gain in the feedback loop for on-the-fly PLAB resizing during a scavengeshare/runtime/globals.hpp
CMSOldPLABResizeQuickerJDK6boolfalseproductReact on-the-fly during a scavenge to a sudden change in block demand rateshare/runtime/globals.hpp
CMSOldPLABToleranceFactorJDK6uintx4
range(1, max_uintx)
productThe tolerance of the phase-change detector for on-the-fly PLAB resizing during a scavengeshare/runtime/globals.hpp
CMSPLABRecordAlwaysJDK6booltrueproductAlways record survivor space PLAB boundaries (effective only if CMSParallelSurvivorRemarkEnabled)share/runtime/globals.hpp
CMSParallelInitialMarkEnabledJDK8booltrueproductUse the parallel initial mark.share/runtime/globals.hpp
CMSParallelRemarkEnabledJDK6booltrueproductWhether parallel remark enabled (only if ParNewGC)share/runtime/globals.hpp
CMSParallelSurvivorRemarkEnabledJDK6booltrueproductWhether parallel remark of survivor space enabled (effective only if CMSParallelRemarkEnabled)share/runtime/globals.hpp
CMSPrecleanDenominatorJDK6uintx3
range(1, max_uintx)
productCMSPrecleanNumerator:CMSPrecleanDenominator yields convergence ratioshare/runtime/globals.hpp
CMSPrecleanIterJDK6uintx3
range(0, 9)
productMaximum number of precleaning iteration passesshare/runtime/globals.hpp
CMSPrecleanNumeratorJDK6uintx2
range(0, max_uintx-1)
productCMSPrecleanNumerator:CMSPrecleanDenominator yields convergence ratioshare/runtime/globals.hpp
CMSPrecleanRefLists1JDK6booltrueproductPreclean ref lists during (initial) preclean phaseshare/runtime/globals.hpp
CMSPrecleanRefLists2JDK6boolfalseproductPreclean ref lists during abortable preclean phaseshare/runtime/globals.hpp
CMSPrecleanSurvivors1JDK6boolfalseproductPreclean survivors during (initial) preclean phaseshare/runtime/globals.hpp
CMSPrecleanSurvivors2JDK6booltrueproductPreclean survivors during abortable preclean phaseshare/runtime/globals.hpp
CMSPrecleanThresholdJDK6uintx1000
range(100, max_uintx)
productDo not iterate again if number of dirty cards is less than thisshare/runtime/globals.hpp
CMSPrecleaningEnabledJDK6booltrueproductWhether concurrent precleaning enabledshare/runtime/globals.hpp
CMSPrintChunksInDumpJDK6boolfalseproductIf logging for the 'gc' and 'promotion' tags is enabled ontrace level include more detailed information about thefree chunksshare/runtime/globals.hpp
CMSPrintObjectsInDumpJDK6boolfalseproductIf logging for the 'gc' and 'promotion' tags is enabled ontrace level include more detailed information about theallocated objectsshare/runtime/globals.hpp
CMSRemarkVerifyVariantJDK6uintx1
range(1, 2)
productChoose variant (1,2) of verification following remarkshare/runtime/globals.hpp
CMSReplenishIntermediateJDK6booltrueproductReplenish all intermediate free-list cachesshare/runtime/globals.hpp
CMSRescanMultipleJDK6size_t32
range(1, SIZE_MAX / 4096)
productSize (in cards) of CMS parallel rescan taskshare/runtime/globals.hpp
CMSSamplingGrainJDK6uintx16*K
range(ObjectAlignmentInBytes, max_uintx)
productThe minimum distance between eden samples for CMS (see above)share/runtime/globals.hpp
CMSScavengeBeforeRemarkJDK6boolfalseproductAttempt scavenge before the CMS remark stepshare/runtime/globals.hpp
CMSScheduleRemarkEdenPenetrationJDK6uintx50
range(0, 100)
productThe Eden occupancy percentage (0-100) at which to try and schedule remark pauseshare/runtime/globals.hpp
CMSScheduleRemarkEdenSizeThresholdJDK6size_t2*M
range(0, max_uintx)
productIf Eden size is below this, do not try to schedule remarkshare/runtime/globals.hpp
CMSScheduleRemarkSamplingRatioJDK6uintx5
range(1, max_uintx)
productStart sampling eden top at least before young gen occupancy reaches 1/ of the size at which we plan to schedule remarkshare/runtime/globals.hpp
CMSSmallCoalSurplusPercentJDK6double1.05
range(0.0, DBL_MAX)
productCMS: the factor by which to inflate estimated demand of small block sizes to prevent coalescing with an adjoining blockshare/runtime/globals.hpp
CMSSmallSplitSurplusPercentJDK6double1.10
range(0.0, DBL_MAX)
productCMS: the factor by which to inflate estimated demand of small block sizes to prevent splitting to supply demand for smaller blocksshare/runtime/globals.hpp
CMSSplitIndexedFreeListBlocksJDK6booltrueproductWhen satisfying batched demand, split blocks from the IndexedFreeList whose size is a multiple of requested sizeshare/runtime/globals.hpp
CMSTestInFreeListJDK6boolfalsedevelopCheck if the coalesced range is already in the free lists as claimedshare/runtime/globals.hpp
CMSTriggerRatioJDK6uintx80
range(0, 100)
productPercentage of MinHeapFreeRatio in CMS generation that is allocated before a CMS collection cycle commencesshare/runtime/globals.hpp
CMSVerifyReturnedBytesJDK6boolfalsenotproductCheck that all the garbage collected was returned to the free listsshare/runtime/globals.hpp
CMSWorkQueueDrainThresholdJDK6uintx10
range(min_jint, max_jint)
productDon't drain below this size per parallel worker/thiefshare/runtime/globals.hpp
CMSYieldSleepCountJDK6uintx0
range(0, max_juint)
productNumber of times a GC thread (minus the coordinator) will sleep while yielding before giving up and resuming GCshare/runtime/globals.hpp
CMSYieldJDK6booltrueproductYield between steps of CMSshare/runtime/globals.hpp
CMSYoungGenPerWorkerJDK6uintxaarch6464*Mdefine_pd_global// default max size of CMS young gen, per GC worker threadcpu/aarch64/globals_aarch64.hpp
CMSYoungGenPerWorkerJDK6size_tarm16*Mdefine_pd_global// default max size of CMS young gen, per GC worker threadcpu/arm/globals_arm.hpp
CMSYoungGenPerWorkerJDK6size_tnull
range(1, max_uintx)
product_pdThe maximum size of young gen chosen by default per GC worker thread availableshare/runtime/globals.hpp
CMSYoungGenPerWorkerJDK6size_tppc16*Mdefine_pd_global// Default max size of CMS young gen, per GC worker thread.cpu/ppc/globals_ppc.hpp
CMSYoungGenPerWorkerJDK6size_ts39016*Mdefine_pd_global// Default max size of CMS young gen, per GC worker thread.cpu/s390/globals_s390.hpp
CMSYoungGenPerWorkerJDK6size_tsparc16*Mdefine_pd_global// default max size of CMS young gen, per GC worker threadcpu/sparc/globals_sparc.hpp
CMSYoungGenPerWorkerJDK6size_tx8664*Mdefine_pd_global// default max size of CMS young gen, per GC worker threadcpu/x86/globals_x86.hpp
CMSYoungGenPerWorkerJDK6size_tzero16*Mdefine_pd_global// default max size of CMS young gen, per GC worker threadcpu/zero/globals_zero.hpp
CMS_FLSPaddingJDK6uintx1
range(0, max_juint)
productThe multiple of deviation from mean to use for buffering against volatility in free list demandshare/runtime/globals.hpp
CMS_FLSWeightJDK6uintx75
range(0, 100)
productPercentage (0-100) used to weight the current sample when computing exponentially decaying averages for CMS FLS statisticsshare/runtime/globals.hpp
CMS_SweepPaddingJDK6uintx1
range(0, max_juint)
productThe multiple of deviation from mean to use for buffering against volatility in inter-sweep durationshare/runtime/globals.hpp
CMS_SweepTimerThresholdMillisJDK6uintx10
range(0, max_uintx)
productSkip block flux-rate sampling for an epoch unless inter-sweep duration exceeds this threshold in millisecondsshare/runtime/globals.hpp
CMS_SweepWeightJDK6uintx75
range(0, 100)
productPercentage (0-100) used to weight the current sample when computing exponentially decaying average for inter-sweep durationshare/runtime/globals.hpp
CPUForCMSThreadJDK6uintx0
range(0, max_juint)
diagnosticWhen BindCMSThreadToCPU is true, the CPU to bind CMS thread toshare/runtime/globals.hpp
CSEArrayLengthJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
CSEArrayLengthJDK6boolarmtruedefine_pd_globalcpu/arm/c1_globals_arm.hpp
CSEArrayLengthJDK6boolppctruedefine_pd_globalcpu/ppc/c1_globals_ppc.hpp
CSEArrayLengthJDK6bools390truedefine_pd_globalcpu/s390/c1_globals_s390.hpp
CSEArrayLengthJDK6boolsparctruedefine_pd_globalcpu/sparc/c1_globals_sparc.hpp
CSEArrayLengthJDK6boolx86falsedefine_pd_globalcpu/x86/c1_globals_x86.hpp
CalculateClassFingerprintJDK10boolfalseproductCalculate class fingerprintshare/runtime/globals.hpp
CanonicalizeNodesJDK6booltruedevelopCanonicalize graph nodesshare/c1/c1_globals.hpp
CheckAssertionStatusDirectivesJDK6boolfalsenotproductTemporary - see javaClasses.cppshare/runtime/globals.hpp
CheckCompressedOopsJDK6booltruenotproductGenerate checks in encoding/decoding code in debug VMshare/runtime/globals.hpp
CheckEndorsedAndExtDirsJDK8boolfalseproductVerify the endorsed and extension directories are not usedshare/runtime/globals.hpp
CheckIntrinsicsJDK9booltrue
range(0, max_intx)
diagnosticWhen a class C is loaded, check that (1) all intrinsics defined by the VM for class C are present in the loaded class file and are marked with the @HotSpotIntrinsicCandidate annotation, that (2) there is an intrinsic registered for all loaded methods that are annotated with the @HotSpotIntrinsicCandidate annotation, and that (3) no orphan methods exist for class C (i.e., methods for which the VM declares an intrinsic but that are not declared in the loaded class C. Check (3) is available only in debug builds.share/runtime/globals.hpp
CheckJNICallsJDK6boolfalseproductVerify all arguments to JNI callsshare/runtime/globals.hpp
CheckMemoryInitializationJDK6boolfalsenotproductCheck memory initializationshare/runtime/globals.hpp
CheckUnhandledOopsJDK6boolfalsedevelopCheck for unhandled oops in VM codeshare/runtime/globals.hpp
CheckZapUnusedHeapAreaJDK6boolfalsedevelopCheck zapping of unused heap spaceshare/runtime/globals.hpp
ClassUnloadingWithConcurrentMarkJDK8booltrueproductDo unloading of classes with a concurrent marking cycleshare/runtime/globals.hpp
ClassUnloadingJDK6booltrueproductDo unloading of classesshare/runtime/globals.hpp
CleanChunkPoolAsyncJDK6booltruedevelopClean the chunk pool asynchronouslyshare/runtime/globals.hpp
ClipInliningJDK6booltrueproductClip inlining if aggregate method exceeds DesiredMethodLimitshare/runtime/globals.hpp
CodeCacheExpansionSizeJDK6intxaarch6432*Kdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
CodeCacheExpansionSizeJDK6size_tarm32*Kdefine_pd_globalcpu/arm/c2_globals_arm.hpp
CodeCacheExpansionSizeJDK6uintxnull
range(1, 100)
product_pdCode cache expansion size (in bytes)share/runtime/globals.hpp
CodeCacheExpansionSizeJDK6intxppc64*Kdefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
CodeCacheExpansionSizeJDK6uintxs39064*Kdefine_pd_globalcpu/s390/c2_globals_s390.hpp
CodeCacheExpansionSizeJDK6intxsparc64*Kdefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
CodeCacheExpansionSizeJDK6intxx8632*Kdefine_pd_globalcpu/x86/c1_globals_x86.hpp
CodeCacheMinBlockLengthJDK6uintxaarch641define_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
CodeCacheMinBlockLengthJDK6uintxarm4define_pd_globalcpu/arm/c2_globals_arm.hpp
CodeCacheMinBlockLengthJDK6intx1define_pd_globalshare/runtime/globals.hpp
CodeCacheMinBlockLengthJDK6uintxppc4define_pd_globalcpu/ppc/c2_globals_ppc.hpp
CodeCacheMinBlockLengthJDK6uintxs3904define_pd_globalcpu/s390/c2_globals_s390.hpp
CodeCacheMinBlockLengthJDK6uintxsparc4define_pd_globalcpu/sparc/c2_globals_sparc.hpp
CodeCacheMinBlockLengthJDK6uintxx861define_pd_globalcpu/x86/c1_globals_x86.hpp
CodeCacheMinimumUseSpaceJDK8uintxaarch64400*Kdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
CodeCacheMinimumUseSpaceJDK8size_tarm400*Kdefine_pd_globalcpu/arm/c2_globals_arm.hpp
CodeCacheMinimumUseSpaceJDK8intx200*Kdefine_pd_globalshare/runtime/globals.hpp
CodeCacheMinimumUseSpaceJDK8uintxppc400*Kdefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
CodeCacheMinimumUseSpaceJDK8uintxs390400*Kdefine_pd_globalcpu/s390/c2_globals_s390.hpp
CodeCacheMinimumUseSpaceJDK8uintxsparc400*Kdefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
CodeCacheMinimumUseSpaceJDK8uintxx86400*Kdefine_pd_globalcpu/x86/c1_globals_x86.hpp
CodeCacheSegmentSizeJDK6uintxaarch6464 TIERED_ONLY(+64)define_pd_global// Tiered compilation has large code-entry alignment.cpu/aarch64/globals_aarch64.hpp
CodeCacheSegmentSizeJDK6uintxarm64 TIERED_ONLY(+64)define_pd_global// Tiered compilation has large code-entry alignment.cpu/arm/globals_arm.hpp
CodeCacheSegmentSizeJDK6uintxppc128define_pd_globalcpu/ppc/globals_ppc.hpp
CodeCacheSegmentSizeJDK6uintxs390256define_pd_globalcpu/s390/globals_s390.hpp
CodeCacheSegmentSizeJDK6uintxsparc64 TIERED_ONLY(+64)define_pd_global// Tiered compilation has large code-entry alignment.cpu/sparc/globals_sparc.hpp
CodeCacheSegmentSizeJDK6uintxx8664 TIERED_ONLY(+64)define_pd_global// Tiered compilation has large code-entry alignment.cpu/x86/globals_x86.hpp
CodeCacheSegmentSizeJDK6uintxzero64 TIERED_ONLY(+64)define_pd_global// Tiered compilation has large code-entry alignment.cpu/zero/globals_zero.hpp
CodeEntryAlignmentJDK6intxaarch6464define_pd_globalcpu/aarch64/globals_aarch64.hpp
CodeEntryAlignmentJDK6intxarm16define_pd_globalcpu/arm/globals_arm.hpp
CodeEntryAlignmentJDK6intxppc128define_pd_globalcpu/ppc/globals_ppc.hpp
CodeEntryAlignmentJDK6intxs39064define_pd_globalcpu/s390/globals_s390.hpp
CodeEntryAlignmentJDK6intxsparc32define_pd_globalcpu/sparc/globals_sparc.hpp
CodeEntryAlignmentJDK6intxx8616define_pd_globalcpu/x86/globals_x86.hpp
CodeEntryAlignmentJDK6intxzero32define_pd_globalcpu/zero/globals_zero.hpp
CollectIndexSetStatisticsJDK6boolfalsenotproductCollect information about IndexSetsshare/runtime/globals.hpp
CommentedAssemblyJDK6booltrueInDebugdevelopShow extra info in PrintNMethods outputshare/c1/c1_globals.hpp
CompactFieldsJDK6booltrueproductAllocate nonstatic fields in gaps between previous fieldsshare/runtime/globals.hpp
CompactStringsJDK9boolaarch64truedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
CompactStringsJDK9boolarmfalsedefine_pd_globalcpu/arm/globals_arm.hpp
CompactStringsJDK9boolnullproduct_pdEnable Strings to use single byte chars in backing storeshare/runtime/globals.hpp
CompactStringsJDK9boolppctruedefine_pd_globalcpu/ppc/globals_ppc.hpp
CompactStringsJDK9bools390truedefine_pd_globalcpu/s390/globals_s390.hpp
CompactStringsJDK9boolsparctruedefine_pd_globalcpu/sparc/globals_sparc.hpp
CompactStringsJDK9boolx86truedefine_pd_globalcpu/x86/globals_x86.hpp
CompactStringsJDK9boolzerofalsedefine_pd_globalcpu/zero/globals_zero.hpp
CompilationPolicyChoiceJDK6intx0
range(0, 3)
productwhich compilation policy (0-3)share/runtime/globals.hpp
CompileCommandFileJDK6ccstrNULLproductRead compiler commands from this file [.hotspot_compiler]share/runtime/globals.hpp
CompileCommandJDK6ccstrlistPrepend to .hotspot_compiler; e.g. log,java/lang/String.productshare/runtime/globals.hpp
CompileOnlyJDK6ccstrlistList of methods (pkg/class.name) to restrict compilation toproductshare/runtime/globals.hpp
CompileTheWorldPreloadClassesJDK6booltruedevelopPreload all classes used by a class before start loadingshare/runtime/globals.hpp
CompileTheWorldSafepointIntervalJDK6intx100notproductForce a safepoint every n compiles so sweeper can keep upshare/runtime/globals.hpp
CompileTheWorldStartAtJDK6intx1notproductFirst class to consider when using +CompileTheWorldshare/runtime/globals.hpp
CompileTheWorldStopAtJDK6intxmax_jintnotproductLast class to consider when using +CompileTheWorldshare/runtime/globals.hpp
CompileTheWorldJDK6boolfalsedevelopCompile all methods in all classes in bootstrap class path (stress test)share/runtime/globals.hpp
CompileThresholdScalingJDK9double1.0
range(0.0, DBL_MAX)
productFactor to control when first compilation happens (both with and without tiered compilation): values greater than 1.0 delay counter overflow, values between 0 and 1.0 rush counter overflow, value of 1.0 leaves compilation thresholds unchanged value of 0.0 is equivalent to -Xint. Flag can be set as per-method option. If a value is specified for a method, compilation thresholds for that method are scaled by both the value of the global flag and the value of the per-method flag.share/runtime/globals.hpp
CompileThresholdJDK6intxaarch641500define_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
CompileThresholdJDK6intxarm10000define_pd_globalcpu/arm/c2_globals_arm.hpp
CompileThresholdJDK6intxnullproduct_pdnumber of interpreted method invocations before (re-)compilingshare/runtime/globals.hpp
CompileThresholdJDK6intxppc10000define_pd_globalcpu/ppc/c2_globals_ppc.hpp
CompileThresholdJDK6intxs39010000define_pd_globalcpu/s390/c2_globals_s390.hpp
CompileThresholdJDK6intxsparc10000define_pd_globalcpu/sparc/c2_globals_sparc.hpp
CompileThresholdJDK6intxx861500define_pd_globalcpu/x86/c1_globals_x86.hpp
CompilerDirectivesFileJDK9ccstrNULLdiagnosticRead compiler directives from this fileshare/runtime/globals.hpp
CompilerDirectivesIgnoreCompileCommandsJDK9boolfalsediagnosticDisable backwards compatibility for compile commands.share/runtime/globals.hpp
CompilerDirectivesLimitJDK9int50diagnosticLimit on number of compiler directives.share/runtime/globals.hpp
CompilerDirectivesPrintJDK9boolfalsediagnosticPrint compiler directives on installation.share/runtime/globals.hpp
CompilerThreadHintNoPreemptJDK6booltrueproduct(Solaris only) Give compiler threads an extra quantashare/runtime/globals.hpp
CompilerThreadPriorityJDK6intx-1
range(min_jint, max_jint)
productThe native priority at which compiler threads should run (-1 means no change)share/runtime/globals.hpp
CompilerThreadStackSizeJDK6intxaixppc4096define_pd_globalos_cpu/aix_ppc/globals_aix_ppc.hpp
CompilerThreadStackSizeJDK6intxbsdx86512define_pd_globalos_cpu/bsd_x86/globals_bsd_x86.hpp
CompilerThreadStackSizeJDK6intxbsdzero0define_pd_globalos_cpu/bsd_zero/globals_bsd_zero.hpp
CompilerThreadStackSizeJDK6intxlinuxaarch642048define_pd_globalos_cpu/linux_aarch64/globals_linux_aarch64.hpp
CompilerThreadStackSizeJDK6intxlinuxarm512define_pd_globalos_cpu/linux_arm/globals_linux_arm.hpp
CompilerThreadStackSizeJDK6intxlinuxppc4096define_pd_globalos_cpu/linux_ppc/globals_linux_ppc.hpp
CompilerThreadStackSizeJDK6intxlinuxs3902048define_pd_globalos_cpu/linux_s390/globals_linux_s390.hpp
CompilerThreadStackSizeJDK6intxlinuxx86512define_pd_globalos_cpu/linux_x86/globals_linux_x86.hpp
CompilerThreadStackSizeJDK6intxlinuxzero0define_pd_globalos_cpu/linux_zero/globals_linux_zero.hpp
CompilerThreadStackSizeJDK6intxnull
range(1, 1024)
product_pdCompiler Thread Stack Size (in Kbytes)share/runtime/globals.hpp
CompilerThreadStackSizeJDK6intxsparc1024define_pd_globalcpu/sparc/globals_sparc.hpp
CompilerThreadStackSizeJDK6intxsolarisx86512define_pd_globalos_cpu/solaris_x86/globals_solaris_x86.hpp
CompilerThreadStackSizeJDK6intxwindowsx860define_pd_globalos_cpu/windows_x86/globals_windows_x86.hpp
CompressedClassSpaceSizeJDK8size_t1*G
range(0, 100)
productMaximum size of class area in Metaspace when compressed class pointers are usedshare/runtime/globals.hpp
ComputeExactFPURegisterUsageJDK6booltruedevelopCompute additional live set for fpu registers to simplify fpu stack merge (Intel only)share/c1/c1_globals.hpp
ConcGCThreadsJDK6uint0productNumber of threads concurrent gc will useshare/runtime/globals.hpp
ConcGCYieldTimeoutJDK6intx0
range(0, max_intx)
developIf non-zero, assert that GC threads yield within this number of millisecondsshare/runtime/globals.hpp
ConditionalMoveLimitJDK6intxaarch643define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
ConditionalMoveLimitJDK6intxarm4define_pd_globalcpu/arm/c2_globals_arm.hpp
ConditionalMoveLimitJDK6intxnull
range(0, max_jint)
product_pdLimit of ops to make speculative when using CMOVEshare/opto/c2_globals.hpp
ConditionalMoveLimitJDK6intxppc3define_pd_globalcpu/ppc/c2_globals_ppc.hpp
ConditionalMoveLimitJDK6intxs3904define_pd_globalcpu/s390/c2_globals_s390.hpp
ConditionalMoveLimitJDK6intxsparc4define_pd_globalcpu/sparc/c2_globals_sparc.hpp
ConditionalMoveLimitJDK6intxx863define_pd_globalcpu/x86/c2_globals_x86.hpp
ContendedPaddingWidthJDK8intx128
range(0, 8192)
productHow many bytes to pad the fields/classes marked @Contended withshare/runtime/globals.hpp
ConvertCmpD2CmpFJDK6booltruedevelopConvert cmpD to cmpF when one input is constant in float rangeshare/opto/c2_globals.hpp
ConvertFloat2IntClippingJDK6booltruedevelopConvert float2int clipping idiom to integer clippingshare/opto/c2_globals.hpp
CountBytecodesJDK6boolfalsedevelopCount number of bytecodes executedshare/runtime/globals.hpp
CountCompiledCallsJDK6boolfalsedevelopCount method invocationsshare/runtime/globals.hpp
CountJNICallsJDK6boolfalsedevelopCount jni method invocationsshare/runtime/globals.hpp
CountJVMCallsJDK6boolfalsenotproductCount jvm method invocationsshare/runtime/globals.hpp
CountLinearScanJDK6boolfalsedevelopcollect statistic counters during LinearScanshare/c1/c1_globals.hpp
CountRemovableExceptionsJDK6boolfalsenotproductCount exceptions that could be replaced by branches due to inliningshare/runtime/globals.hpp
CountRuntimeCallsJDK6boolfalsenotproductCount VM runtime callsshare/runtime/globals.hpp
CounterDecayMinIntervalLengthJDK6intx500developThe minimum interval (in milliseconds) between invocation of CounterDecayshare/runtime/globals.hpp
CounterHalfLifeTimeJDK6intx30developHalf-life time of invocation counters (in seconds)share/runtime/globals.hpp
CrashGCForDumpingJavaThreadJDK6boolfalsenotproductManually make GC thread crash then dump java stack trace;Test onlyshare/runtime/globals.hpp
CrashOnOutOfMemoryErrorJDK8boolfalseproductJVM aborts, producing an error log and core/mini dump, on the first occurrence of an out-of-memory errorshare/runtime/globals.hpp
CreateCoredumpOnCrashJDK9booltrueproductCreate core/mini dump on VM fatal errorshare/runtime/globals.hpp
CriticalJNINativesJDK6booltrueproductCheck for critical JNI entry pointsshare/runtime/globals.hpp
DSCR_DPFD_PPC64JDK9uint64_tppc8productPower8 or later: DPFD (default prefetch depth) value of the Data Stream Control Register. 0: hardware default, 1: none, 2-7: min-max, 8: don't touchcpu/ppc/globals_ppc.hpp
DSCR_PPC64JDK9uint64_tppc(uintx)-1productPower8 or later: Specify encoded value for Data Stream Control Registercpu/ppc/globals_ppc.hpp
DSCR_URG_PPC64JDK9uint64_tppc8productPower8 or later: URG (depth attainment urgency) value of the Data Stream Control Register. 0: hardware default, 1: none, 2-7: min-max, 8: don't touchcpu/ppc/globals_ppc.hpp
DTraceAllocProbesJDK6boolfalseproductEnable dtrace probes for object allocationshare/runtime/globals.hpp
DTraceMethodProbesJDK6boolfalseproductEnable dtrace probes for method-entry and method-exitshare/runtime/globals.hpp
DTraceMonitorProbesJDK6boolfalseproductEnable dtrace probes for monitor eventsshare/runtime/globals.hpp
DebugDeoptimizationJDK6boolfalsedevelopTracing various information while debugging deoptimizationshare/runtime/globals.hpp
DebugInlinedCallsJDK6booltruediagnosticIf false, restricts profiled locations to the root method onlyshare/opto/c2_globals.hpp
DebugNonSafepointsJDK6booltrueInDebugdiagnosticGenerate extra debugging information for non-safepoints in nmethodsshare/runtime/globals.hpp
DebugVtablesJDK6boolfalsedevelopadd debugging code to vtable dispatchshare/runtime/globals.hpp
DebuggingJDK6boolfalseproductSet when executing debug methods in debug.cpp (to prevent triggering assertions)share/runtime/globals.hpp
DeferInitialCardMarkJDK6boolfalsediagnosticWhen +ReduceInitialCardMarks, explicitly defer any that may arise from new_pre_store_barriershare/runtime/globals.hpp
DeferPollingPageLoopCountJDK6intx-1
range(-1, max_jint-1)
product(Unsafe,Unstable,Deprecated) Number of iterations in safepoint loop before changing safepoint polling page to ROshare/runtime/globals.hpp
DeferThrSuspendLoopCountJDK6intx4000
range(-1, max_jint-1)
product(Unstable, Deprecated) Number of times to iterate in safepoint loop before blocking VM threadsshare/runtime/globals.hpp
DelayCompilationDuringStartupJDK6booltruedevelopDelay invoking the compiler until main application class is loadedshare/runtime/globals.hpp
DeoptC1JDK6booltruedevelopUse deoptimization in C1share/c1/c1_globals.hpp
DeoptimizeALotIntervalJDK6intx5notproductNumber of exits until DeoptimizeALot kicks inshare/runtime/globals.hpp
DeoptimizeALotJDK6boolfalsedevelopDeoptimize at every exit from the runtime systemshare/runtime/globals.hpp
DeoptimizeOnlyAtJDK6ccstrlistA comma separated list of bcis to deoptimize atnotproductshare/runtime/globals.hpp
DeoptimizeRandomJDK6boolfalseproductDeoptimize random frames on random exit from the runtime systemshare/runtime/globals.hpp
DesiredMethodLimitJDK6intx8000developThe desired maximum method size (in bytecodes) after inliningshare/runtime/globals.hpp
DieOnSafepointTimeoutJDK6boolfalsedevelopDie upon failure to reach safepoint (see SafepointTimeout)share/runtime/globals.hpp
DisableAttachMechanismJDK6boolfalseproductDisable mechanism that allows tools to attach to this VMshare/runtime/globals.hpp
DisableBCCheckJDK9boolaarch64trueproducttell sim not to invoke bccheck callbackcpu/aarch64/globals_aarch64.hpp
DisableExplicitGCJDK6boolfalseproductIgnore calls to System.gc()share/runtime/globals.hpp
DisableIntrinsicJDK6ccstrlistdo not expand intrinsics whose (internal) names appear herediagnosticshare/runtime/globals.hpp
DisablePrimordialThreadGuardPagesJDK8boolfalseexperimentalDisable the use of stack guard pages if the JVM is loaded on the primordial process threadshare/runtime/globals.hpp
DisableStartThreadJDK6boolfalsedevelopDisable starting of additional Java threads (for debugging only)share/runtime/globals.hpp
DisplayVMOutputToStderrJDK6boolfalseproductIf DisplayVMOutput is true, display all VM output to stderrshare/runtime/globals.hpp
DisplayVMOutputToStdoutJDK6boolfalseproductIf DisplayVMOutput is true, display all VM output to stdoutshare/runtime/globals.hpp
DisplayVMOutputJDK6booltruediagnosticDisplay all VM output on the tty, independently of LogVMOutputshare/runtime/globals.hpp
DoCEEJDK6booltruedevelopDo Conditional Expression Elimination to simplify CFGshare/c1/c1_globals.hpp
DoEscapeAnalysisJDK6booltrueproductPerform escape analysisshare/opto/c2_globals.hpp
DoReserveCopyInSuperWordJDK9booltrueproductCreate reserve copy of graph in SuperWord.share/opto/c2_globals.hpp
DominatorSearchLimitJDK6intx1000
range(0, max_jint)
diagnosticIterations limit in Node::dominatesshare/opto/c2_globals.hpp
DontCompileHugeMethodsJDK6booltrueproductDo not compile methods > HugeMethodLimitshare/runtime/globals.hpp
DontYieldALotIntervalJDK6intx10developInterval between which yields will be dropped (milliseconds)share/runtime/globals.hpp
DontYieldALotJDK6boolaixppcfalsedefine_pd_globalos_cpu/aix_ppc/globals_aix_ppc.hpp
DontYieldALotJDK6boolbsdx86falsedefine_pd_globalos_cpu/bsd_x86/globals_bsd_x86.hpp
DontYieldALotJDK6boolbsdzerofalsedefine_pd_globalos_cpu/bsd_zero/globals_bsd_zero.hpp
DontYieldALotJDK6boollinuxaarch64falsedefine_pd_globalos_cpu/linux_aarch64/globals_linux_aarch64.hpp
DontYieldALotJDK6boollinuxarmfalsedefine_pd_globalos_cpu/linux_arm/globals_linux_arm.hpp
DontYieldALotJDK6boollinuxppcfalsedefine_pd_globalos_cpu/linux_ppc/globals_linux_ppc.hpp
DontYieldALotJDK6boollinuxs390falsedefine_pd_globalos_cpu/linux_s390/globals_linux_s390.hpp
DontYieldALotJDK6boollinuxx86falsedefine_pd_globalos_cpu/linux_x86/globals_linux_x86.hpp
DontYieldALotJDK6boollinuxzerofalsedefine_pd_globalos_cpu/linux_zero/globals_linux_zero.hpp
DontYieldALotJDK6boolnullproduct_pdThrow away obvious excess yield callsshare/runtime/globals.hpp
DontYieldALotJDK6boolsparctruedefine_pd_global// yield no more than 100 times per secondcpu/sparc/globals_sparc.hpp
DontYieldALotJDK6boolsolarisx86truedefine_pd_global// Determined in the design centeros_cpu/solaris_x86/globals_solaris_x86.hpp
DontYieldALotJDK6boolwindowsx86falsedefine_pd_globalos_cpu/windows_x86/globals_windows_x86.hpp
DumpLoadedClassListJDK8ccstrNULLproductDump the names all loaded classes, that could be stored into the CDS archive, in the specified fileshare/runtime/globals.hpp
DumpReplayDataOnErrorJDK8booltrueproductRecord replay data for crashing compiler threadsshare/runtime/globals.hpp
DumpSharedSpacesJDK6boolfalseproductSpecial mode: JVM reads a class list, loads classes, builds shared spaces, and dumps the shared spaces to a file to be used in future JVM runsshare/runtime/globals.hpp
DynamicallyResizeSystemDictionariesJDK10booltruediagnosticDynamically resize system dictionaries as neededshare/runtime/globals.hpp
EagerInitializationJDK6boolfalsedevelopEagerly initialize classes if possibleshare/runtime/globals.hpp
EagerXrunInitJDK6boolfalseproductEagerly initialize -Xrun libraries; allows startup profiling, but not all -Xrun libraries may support the state of the VM at this timeshare/runtime/globals.hpp
EliminateAllocationArraySizeLimitJDK6intx64
range(0, max_jint)
productArray size (number of elements) limit for scalar replacementshare/opto/c2_globals.hpp
EliminateAllocationsJDK6booltrueproductUse escape analysis to eliminate allocationsshare/opto/c2_globals.hpp
EliminateAutoBoxJDK6booltrueproductControl optimizations for autobox eliminationshare/opto/c2_globals.hpp
EliminateBlocksJDK6booltruedevelopEliminate unneccessary basic blocksshare/c1/c1_globals.hpp
EliminateFieldAccessJDK6booltruedevelopOptimize field loads and storesshare/c1/c1_globals.hpp
EliminateLocksJDK6booltrueproductCoarsen locks when possibleshare/opto/c2_globals.hpp
EliminateNestedLocksJDK6booltrueproductEliminate nested locks of the same object when possibleshare/opto/c2_globals.hpp
EliminateNullChecksJDK6booltruedevelopEliminate unneccessary null checksshare/c1/c1_globals.hpp
EmitSyncJDK6intx0experimental(Unsafe, Unstable) Control emission of inline sync fast-path codeshare/runtime/globals.hpp
EnableContendedJDK8booltrueproductEnable @Contended annotation supportshare/runtime/globals.hpp
EnableDynamicAgentLoadingJDK9booltrueproductAllow tools to load agents with the attach mechanismshare/runtime/globals.hpp
EnableJVMCIJDK9boolfalseexperimentalEnable JVMCIshare/jvmci/jvmci_globals.hpp
EnableThreadSMRExtraValidityChecksJDK10booltruediagnosticEnable Thread SMR extra validity checksshare/runtime/globals.hpp
EnableThreadSMRStatisticsJDK10booltrueInDebugdiagnosticEnable Thread SMR Statisticsshare/runtime/globals.hpp
EnableTracingJDK8boolfalseproductEnable event-based tracingshare/runtime/globals.hpp
ErgoHeapSizeLimitJDK6size_t0
range(0, max_uintx)
productMaximum ergonomically set heap size (in bytes); zero means use MaxRAM * MaxRAMPercentage / 100share/runtime/globals.hpp
ErrorFileJDK6ccstrNULLproductIf an error occurs, save the error data to this file [default: ./hs_err_pid%p.log] (%p replaced with pid)share/runtime/globals.hpp
ErrorHandlerTestJDK6uintx0notproductIf > 0, provokes an error after VM initialization; the value determines which error to provoke. See test_error_handler() in vmError.cpp.share/runtime/globals.hpp
ErrorLogTimeoutJDK9uint64_t2 * 60
range(0, (uint64_t)max_jlong/1000)
productTimeout, in seconds, to limit the time spent on writing an error log in case of a crash.share/runtime/globals.hpp
ErrorReportServerJDK6ccstrNULLproductOverride built-in error report server addressshare/runtime/globals.hpp
EscapeAnalysisTimeoutJDK8double20. DEBUG_ONLY(+40.)
range(0, DBL_MAX)
productAbort EA when it reaches time limit (in sec)share/opto/c2_globals.hpp
EstimateArgEscapeJDK6booltrueproductAnalyze bytecodes to estimate escape state of argumentsshare/runtime/globals.hpp
ExecuteInternalVMTestsJDK6boolfalsenotproductEnable execution of internal VM testsshare/runtime/globals.hpp
ExecutingUnitTestsJDK9boolfalseproductWhether the JVM is running unit tests or notshare/runtime/globals.hpp
ExitEscapeAnalysisOnTimeoutJDK8booltruedevelopExit or throw assert in EA when it reaches time limitshare/opto/c2_globals.hpp
ExitOnFullCodeCacheJDK6boolfalsenotproductExit the VM if we fill the code cacheshare/runtime/globals.hpp
ExitOnOutOfMemoryErrorJDK8boolfalseproductJVM exits on the first occurrence of an out-of-memory errorshare/runtime/globals.hpp
ExitVMOnVerifyErrorJDK6boolfalsenotproductstandard exit from VM if bytecode verify error (only in debug mode)share/runtime/globals.hpp
ExpandLoadingBaseDecode_NNJDK9bools390trueproductExpand the assembler instruction required to load the base from DecodeN_NN nodes during matching.cpu/s390/globals_s390.hpp
ExpandLoadingBaseDecodeJDK9bools390trueproductExpand the assembler instruction required to load the base from DecodeN nodes during matching.cpu/s390/globals_s390.hpp
ExpandLoadingBaseEncode_NNJDK9bools390trueproductExpand the assembler instruction required to load the base from EncodeP_NN nodes during matching.cpu/s390/globals_s390.hpp
ExpandLoadingBaseEncodeJDK9bools390trueproductExpand the assembler instruction required to load the base from EncodeP nodes during matching.cpu/s390/globals_s390.hpp
ExplicitGCInvokesConcurrentJDK6boolfalseproductA System.gc() request invokes a concurrent collection; (effective only when using concurrent collectors)share/runtime/globals.hpp
ExtendedDTraceProbesJDK6boolfalseproductEnable performance-impacting dtrace probesshare/runtime/globals.hpp
ExtraSharedClassListFileJDK8ccstrNULLproductExtra classlist for building the CDS archive fileshare/runtime/globals.hpp
FLOATPRESSUREJDK6intxaarch6464define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
FLOATPRESSUREJDK6intxarm30define_pd_globalcpu/arm/c2_globals_arm.hpp
FLOATPRESSUREJDK6intxppc28define_pd_globalcpu/ppc/c2_globals_ppc.hpp
FLOATPRESSUREJDK6intxs39015define_pd_globalcpu/s390/c2_globals_s390.hpp
FLOATPRESSUREJDK6intxsparc52define_pd_global// C2 on V9 gets to use all the float/double registerscpu/sparc/c2_globals_sparc.hpp
FLOATPRESSUREJDK6intxx866define_pd_globalcpu/x86/c2_globals_x86.hpp
FLSAlwaysCoalesceLargeJDK6boolfalseproductCMS: larger free blocks are always available for coalescingshare/runtime/globals.hpp
FLSCoalescePolicyJDK6uintx2
range(0, 4)
productCMS: aggressiveness level for coalescing, increasing from 0 to 4share/runtime/globals.hpp
FLSLargestBlockCoalesceProximityJDK6double0.99
range(0.0, 1.0)
productCMS: the smaller the percentage the greater the coalescing forceshare/runtime/globals.hpp
FLSVerifyAllHeapReferencesJDK6boolfalsediagnosticVerify that all references across the FLS boundary are to valid objectsshare/runtime/globals.hpp
FLSVerifyDictionaryJDK6boolfalsedevelopDo lots of (expensive) FLS dictionary verificationshare/runtime/globals.hpp
FLSVerifyIndexTableJDK6boolfalsediagnosticDo lots of (expensive) FLS index table verificationshare/runtime/globals.hpp
FLSVerifyListsJDK6boolfalsediagnosticDo lots of (expensive) FreeListSpace verificationshare/runtime/globals.hpp
FailOverToOldVerifierJDK6booltrueproductFail over to old verifier when split verifier failsshare/runtime/globals.hpp
FastAllocateSizeLimitJDK6intx128*Kdevelop/* Note:This value is zero mod 1<<13 for a cheap sparc set. */Inline allocations larger than this in doublewords must go slowshare/runtime/globals.hpp
FastSuperclassLimitJDK6intx8developDepth of hardwired instanceof accelerator arrayshare/runtime/globals.hpp
FastTLABRefillJDK6boolfalseproduct(Deprecated) Use fast TLAB refill codeshare/runtime/globals.hpp
FieldsAllocationStyleJDK6intx1
range(0, 2)
product0 - type based with oops first, 1 - with oops last, 2 - oops in super and sub classes are togethershare/runtime/globals.hpp
FillDelaySlotsJDK6booltruedevelopFill delay slots (on SPARC only)share/runtime/globals.hpp
FilterSpuriousWakeupsJDK6booltrueproductWhen true prevents OS-level spurious, or premature, wakeups from Object.wait (Ignored for Windows)share/runtime/globals.hpp
FoldStableValuesJDK8booltruediagnosticOptimize loads from stable fields (marked w/ @Stable)share/runtime/globals.hpp
ForceDynamicNumberOfGCThreadsJDK6boolfalsediagnosticForce dynamic selection of the number of parallel threads parallel gc will use to aid debuggingshare/runtime/globals.hpp
ForceFloatExceptionsJDK6booltrueInDebugdevelopForce exceptions on FP stack under/overflowshare/runtime/globals.hpp
ForceNUMAJDK6boolfalseproductForce NUMA optimizations on single-node/UMA systemsshare/runtime/globals.hpp
ForceTimeHighResolutionJDK6boolfalseproductUsing high time resolution (for Win32 only)share/runtime/globals.hpp
ForceUnreachableJDK6boolfalsediagnosticMake all non code cache addresses to be unreachable by forcing use of 64bit literal fixupsshare/runtime/globals.hpp
FreqCountInvocationsJDK6intx1
range(1, max_intx)
developScaling factor for branch frequencies (deprecated)share/opto/c2_globals.hpp
FreqInlineSizeJDK6intxaarch64325define_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
FreqInlineSizeJDK6intxarm175define_pd_globalcpu/arm/c2_globals_arm.hpp
FreqInlineSizeJDK6intxnull
range(0, max_jint)
product_pdThe maximum bytecode size of a frequent method to be inlinedshare/runtime/globals.hpp
FreqInlineSizeJDK6intxppc175define_pd_globalcpu/ppc/c2_globals_ppc.hpp
FreqInlineSizeJDK6intxs390175define_pd_globalcpu/s390/c2_globals_s390.hpp
FreqInlineSizeJDK6intxsparc175define_pd_globalcpu/sparc/c2_globals_sparc.hpp
FreqInlineSizeJDK6intxx86325define_pd_globalcpu/x86/c1_globals_x86.hpp
FullGCALotDummiesJDK6intx32*KnotproductDummy object allocated with +FullGCALot, forcing all objects to moveshare/runtime/globals.hpp
FullGCALotIntervalJDK6intx1notproductInterval between which full gc will occur with +FullGCALotshare/runtime/globals.hpp
FullGCALotStartJDK6intx0notproductFor which invocation to start FullGCAlotshare/runtime/globals.hpp
FullGCALotJDK6boolfalsedevelopForce full gc at every Nth exit from the runtime system (N=FullGCALotInterval)share/runtime/globals.hpp
G1AdaptiveIHOPNumInitialSamplesJDK9size_t3
range(1, max_intx)
experimentalHow many completed time periods from initial mark to first mixed gc are required to use the input values for prediction of the optimal occupancy to start marking.share/gc/g1/g1_globals.hpp
G1ConcMarkStepDurationMillisJDK6double10.0
range(1.0, DBL_MAX)
productTarget duration of individual concurrent marking steps in milliseconds.share/gc/g1/g1_globals.hpp
G1ConcRSHotCardLimitJDK6uintx4
range(0, max_jubyte)
productThe threshold that defines (>=) a hot card.share/gc/g1/g1_globals.hpp
G1ConcRSLogCacheSizeJDK6size_t10
range(0, 27)
productLog base 2 of the length of conc RS hot-card cache.share/gc/g1/g1_globals.hpp
G1ConcRefinementGreenZoneJDK6size_t0
range(0, max_intx)
productThe number of update buffers that are left in the queue by the concurrent processing threads. Will be selected ergonomically by default.share/gc/g1/g1_globals.hpp
G1ConcRefinementRedZoneJDK6size_t0
range(0, max_intx)
productMaximum number of enqueued update buffers before mutator threads start processing new ones instead of enqueueing them. Will be selected ergonomically by default.share/gc/g1/g1_globals.hpp
G1ConcRefinementServiceIntervalMillisJDK6uintx300
range(0, max_jint)
productThe last concurrent refinement thread wakes up every specified number of milliseconds to do miscellaneous work.share/gc/g1/g1_globals.hpp
G1ConcRefinementThreadsJDK6uint0
range(0, (max_jint-1)/wordSize)
productThe number of parallel rem set update threads. Will be set ergonomically by default.share/gc/g1/g1_globals.hpp
G1ConcRefinementThresholdStepJDK6size_t2
range(1, SIZE_MAX)
productEach time the rset update queue increases by this amount activate the next refinement thread if available. The actual step size will be selected ergonomically by default, with this value used to determine a lower bound.share/gc/g1/g1_globals.hpp
G1ConcRefinementYellowZoneJDK6size_t0
range(0, max_intx)
productNumber of enqueued update buffers that will trigger concurrent processing. Will be selected ergonomically by default.share/gc/g1/g1_globals.hpp
G1ConfidencePercentJDK6uintx50
range(0, 100)
productConfidence level for MMU/pause predictionsshare/gc/g1/g1_globals.hpp
G1DummyRegionsPerGCJDK6uintx0developThe number of dummy regions G1 will allocate at the end of each evacuation pause in order to artificially fill up the heap and stress the marking implementation.share/gc/g1/g1_globals.hpp
G1EagerReclaimHumongousObjectsWithStaleRefsJDK8booltrueexperimentalTry to reclaim dead large objects that have a few stale references at every young GC.share/gc/g1/g1_globals.hpp
G1EagerReclaimHumongousObjectsJDK8booltrueexperimentalTry to reclaim dead large objects at every young GC.share/gc/g1/g1_globals.hpp
G1EvacuationFailureALotCountJDK8uintx1000developNumber of successful evacuations between evacuation failures occurring at object copyingshare/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringConcMarkJDK8booltruedevelopForce use of evacuation failure handling during evacuation pauses when marking is in progressshare/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringInitialMarkJDK8booltruedevelopForce use of evacuation failure handling during initial mark evacuation pausesshare/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringMixedGCJDK8booltruedevelopForce use of evacuation failure handling during mixed evacuation pausesshare/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringYoungGCJDK8booltruedevelopForce use of evacuation failure handling during young evacuation pausesshare/gc/g1/g1_globals.hpp
G1EvacuationFailureALotIntervalJDK8uintx5developTotal collections between forced triggering of evacuation failuresshare/gc/g1/g1_globals.hpp
G1EvacuationFailureALotJDK8boolfalsenotproductForce use of evacuation failure handling during certain evacuation pausesshare/gc/g1/g1_globals.hpp
G1ExitOnExpansionFailureJDK6boolfalsedevelopRaise a fatal VM exit out of memory failure in the eventthat heap expansion fails due to running out of swap.share/gc/g1/g1_globals.hpp
G1ExpandByPercentOfAvailableJDK6intx20
range(0, 100)
experimentalWhen expanding, % of uncommitted space to claim.share/gc/g1/g1_globals.hpp
G1HRRSUseSparseTableJDK6booltruedevelopWhen true, use sparse table to save space.share/gc/g1/g1_globals.hpp
G1HeapRegionSizeJDK6size_t0
range(0, 32*M)
productSize of the G1 regions.share/gc/g1/g1_globals.hpp
G1HeapWastePercentJDK8uintx5
range(0, 100)
productAmount of space, expressed as a percentage of the heap size, that G1 is willing not to collect to avoid expensive GCs.share/gc/g1/g1_globals.hpp
G1LastPLABAverageOccupancyJDK9double50.0
range(0.001, 100.0)
experimentalThe expected average occupancy of the last PLAB in percent.share/gc/g1/g1_globals.hpp
G1MaxNewSizePercentJDK8uintx60
range(0, 100)
experimentalPercentage (0-100) of the heap size to use as defaultmaximum young gen size.share/gc/g1/g1_globals.hpp
G1MaxVerifyFailuresJDK6intx-1
range(-1, max_jint)
developThe maximum number of verification failures to print.-1 means print all.share/gc/g1/g1_globals.hpp
G1MixedGCCountTargetJDK8uintx8
range(0, max_uintx)
productThe target number of mixed GCs after a marking cycle.share/gc/g1/g1_globals.hpp
G1MixedGCLiveThresholdPercentJDK8uintx85
range(0, 100)
experimentalThreshold for regions to be considered for inclusion in the collection set of mixed GCs. Regions with live bytes exceeding this will not be collected.share/gc/g1/g1_globals.hpp
G1NewSizePercentJDK8uintx5
range(0, 100)
experimentalPercentage (0-100) of the heap size to use as default minimum young gen size.share/gc/g1/g1_globals.hpp
G1OldCSetRegionThresholdPercentJDK6uintx10
range(0, 100)
experimentalAn upper bound for the number of old CSet regions expressed as a percentage of the heap size.share/gc/g1/g1_globals.hpp
G1PretouchAuxiliaryMemoryJDK9boolfalseexperimentalPre-touch large auxiliary data structures used by the GC.share/gc/g1/g1_globals.hpp
G1RSBarrierRegionFilterJDK6booltruedevelopIf true, generate region filtering code in RS barriershare/gc/g1/g1_globals.hpp
G1RSetRegionEntriesBaseJDK6intx256
range(1, max_jint/wordSize)
developMax number of regions in a fine-grain table per MB.share/gc/g1/g1_globals.hpp
G1RSetRegionEntriesJDK6intx0
range(0, max_jint/wordSize)
productMax number of regions for which we keep bitmaps.Will be set ergonomically by defaultshare/gc/g1/g1_globals.hpp
G1RSetScanBlockSizeJDK6size_t64
range(1, max_uintx)
productSize of a work unit of cards claimed by a worker threadduring RSet scanning.share/gc/g1/g1_globals.hpp
G1RSetSparseRegionEntriesBaseJDK6intx4
range(1, max_jint/wordSize)
developMax number of entries per region in a sparse table per MB.share/gc/g1/g1_globals.hpp
G1RSetSparseRegionEntriesJDK6intx0
range(0, max_jint/wordSize)
productMax number of entries per region in a sparse table.Will be set ergonomically by default.share/gc/g1/g1_globals.hpp
G1RSetUpdatingPauseTimePercentJDK6intx10
range(0, 100)
productA target percentage of time that is allowed to be spend on process RS update buffers during the collection pause.share/gc/g1/g1_globals.hpp
G1RefProcDrainIntervalJDK6int10
range(1, INT_MAX)
productThe number of discovered reference objects to process before draining concurrent marking work queues.share/gc/g1/g1_globals.hpp
G1ReservePercentJDK6uintx10
range(0, 50)
productIt determines the minimum reserve we should have in the heap to minimize the probability of promotion failure.share/gc/g1/g1_globals.hpp
G1SATBBufferEnqueueingThresholdPercentJDK6uintx60
range(0, 100)
productBefore enqueueing them, each mutator thread tries to do some filtering on the SATB buffers it generates. If post-filtering the percentage of retained entries is over this threshold the buffer will be enqueued for processing. A value of 0 specifies that mutator threads should not do such filtering.share/gc/g1/g1_globals.hpp
G1SATBBufferSizeJDK6size_t1*K
range(1, max_uintx)
productNumber of entries in an SATB log buffer.share/gc/g1/g1_globals.hpp
G1SATBProcessCompletedThresholdJDK6intx20
range(0, max_jint)
developNumber of completed buffers that triggers log processing.share/gc/g1/g1_globals.hpp
G1ScrubRemSetsJDK6booltruedevelopWhen true, do RS scrubbing after cleanup.share/gc/g1/g1_globals.hpp
G1SecondaryFreeListAppendLengthJDK6uintx5developThe number of regions we will add to the secondary free list at every append operationshare/gc/g1/g1_globals.hpp
G1StressConcRegionFreeingDelayMillisJDK6uintx0developArtificial delay during concurrent region freeingshare/gc/g1/g1_globals.hpp
G1StressConcRegionFreeingJDK6boolfalsedevelopIt stresses the concurrent region freeing operationshare/gc/g1/g1_globals.hpp
G1SummarizeRSetStatsPeriodJDK6intx0
range(0, max_intx)
diagnosticThe period (in number of GCs) at which we will generate update buffer processing info (0 means do not periodically generate this info); it also requires that logging is enabled on the tracelevel for gc+remsetshare/gc/g1/g1_globals.hpp
G1UpdateBufferSizeJDK6size_t256
range(1, NOT_LP64(32*M) LP64_ONLY(1*G))
productSize of an update buffershare/gc/g1/g1_globals.hpp
G1UseAdaptiveConcRefinementJDK6booltrueproductSelect green, yellow and red zones adaptively to meet the the pause requirements.share/gc/g1/g1_globals.hpp
G1UseAdaptiveIHOPJDK9booltrueproductAdaptively adjust the initiating heap occupancy from the initial value of InitiatingHeapOccupancyPercent. The policy attempts to start marking in time based on application behavior.share/gc/g1/g1_globals.hpp
G1VerifyBitmapsJDK8boolfalsedevelopVerifies the consistency of the marking bitmapsshare/gc/g1/g1_globals.hpp
G1VerifyCTCleanupJDK6boolfalsedevelopVerify card table cleanup.share/gc/g1/g1_globals.hpp
G1VerifyHeapRegionCodeRootsJDK8boolfalsediagnosticVerify the code root lists attached to each heap region.share/gc/g1/g1_globals.hpp
G1VerifyRSetsDuringFullGCJDK8boolfalsediagnosticIf true, perform verification of each heap region's remembered set when verifying the heap during a full GC.share/gc/g1/g1_globals.hpp
GCALotAtAllSafepointsJDK6boolfalsenotproductEnforce ScavengeALot/GCALot at all potential safepointsshare/runtime/globals.hpp
GCDrainStackTargetSizeJDK6uintx64
range(0, max_juint)
productNumber of entries we will try to leave on the stack during parallel gcshare/runtime/globals.hpp
GCExpandToAllocateDelayMillisJDK6uintx0developDelay between expansion and allocation (in milliseconds)share/runtime/globals.hpp
GCHeapFreeLimitJDK6uintx2
range(0, 100)
productMinimum percentage of free space after a full GC before an OutOfMemoryError is thrown (used with GCTimeLimit)share/runtime/globals.hpp
GCLockerEdenExpansionPercentJDK6uintx5
range(0, 100)
productHow much the GC can expand the eden by while the GC locker is active (as a percentage)share/runtime/globals.hpp
GCLockerInvokesConcurrentJDK6boolfalseproductThe exit of a JNI critical section necessitating a scavenge, also kicks off a background concurrent collectionshare/runtime/globals.hpp
GCLockerRetryAllocationCountJDK8uintx2
range(0, max_uintx)
diagnosticNumber of times to retry allocations when blocked by the GC lockershare/runtime/globals.hpp
GCParallelVerificationEnabledJDK6booltruediagnosticEnable parallel memory system verificationshare/runtime/globals.hpp
GCPauseIntervalMillisJDK6uintx0productTime slice for MMU specificationshare/runtime/globals.hpp
GCTaskTimeStampEntriesJDK6uint200
range(1, max_jint)
productNumber of time stamp entries per gc worker threadshare/runtime/globals.hpp
GCTimeLimitJDK6uintx98
range(0, 100)
productLimit of the proportion of time spent in GC before an OutOfMemoryError is thrown (used with GCHeapFreeLimit)share/runtime/globals.hpp
GCTimeRatioJDK6uintx99
range(0, max_juint)
productAdaptive size policy application time to GC time ratioshare/runtime/globals.hpp
GCWorkerDelayMillisJDK8uintx0developDelay in scheduling GC workers (in milliseconds)share/runtime/globals.hpp
GenerateArrayStoreCheckJDK6booltruedevelopGenerates code for array store checksshare/c1/c1_globals.hpp
GenerateRangeChecksJDK6booltruedevelopGenerate range checks for array accessesshare/runtime/globals.hpp
GenerateSynchronizationCodeJDK6booltruedevelopgenerate locking/unlocking code for synchronized methods and monitorsshare/runtime/globals.hpp
GuaranteedSafepointIntervalJDK9intx1000
range(0, max_jint)
diagnosticGuarantee a safepoint (at least) every so many milliseconds (0 means none)share/runtime/globals.hpp
HandshakeTimeoutJDK10uint0diagnosticIf nonzero set a timeout in milliseconds for handshakesshare/runtime/globals.hpp
HeapBaseMinAddressJDK6size_taixppc2*Gdefine_pd_globalos_cpu/aix_ppc/globals_aix_ppc.hpp
HeapBaseMinAddressJDK6size_tbsdx862*Gdefine_pd_globalos_cpu/bsd_x86/globals_bsd_x86.hpp
HeapBaseMinAddressJDK6size_tbsdzero2*Gdefine_pd_globalos_cpu/bsd_zero/globals_bsd_zero.hpp
HeapBaseMinAddressJDK6uintxlinuxaarch642*Gdefine_pd_globalos_cpu/linux_aarch64/globals_linux_aarch64.hpp
HeapBaseMinAddressJDK6size_tlinuxarm2*Gdefine_pd_globalos_cpu/linux_arm/globals_linux_arm.hpp
HeapBaseMinAddressJDK6size_tlinuxppc2*Gdefine_pd_globalos_cpu/linux_ppc/globals_linux_ppc.hpp
HeapBaseMinAddressJDK6size_tlinuxs3902*Gdefine_pd_globalos_cpu/linux_s390/globals_linux_s390.hpp
HeapBaseMinAddressJDK6size_tlinuxsparcCONST64(4)*Gdefine_pd_globalos_cpu/linux_sparc/globals_linux_sparc.hpp
HeapBaseMinAddressJDK6size_tlinuxx862*Gdefine_pd_globalos_cpu/linux_x86/globals_linux_x86.hpp
HeapBaseMinAddressJDK6size_tlinuxzero2*Gdefine_pd_globalos_cpu/linux_zero/globals_linux_zero.hpp
HeapBaseMinAddressJDK6size_tnullproduct_pdOS specific low limit for heap base addressshare/runtime/globals.hpp
HeapBaseMinAddressJDK6size_tsolarissparcCONST64(6)*Gdefine_pd_globalos_cpu/solaris_sparc/globals_solaris_sparc.hpp
HeapBaseMinAddressJDK6size_tsolarisx862*Gdefine_pd_globalos_cpu/solaris_x86/globals_solaris_x86.hpp
HeapBaseMinAddressJDK6size_twindowsx862*Gdefine_pd_globalos_cpu/windows_x86/globals_windows_x86.hpp
HeapFirstMaximumCompactionCountJDK6uintx3
range(0, max_uintx)
productThe collection count for the first maximum compactionshare/runtime/globals.hpp
HeapMaximumCompactionIntervalJDK6uintx20
range(0, max_uintx)
productHow often should we maximally compact the heap (not allowing any dead space)share/runtime/globals.hpp
HeapSearchStepsJDK9uintx3 PPC64_ONLY(+17)
range(1, max_uintx)
productHeap allocation steps through preferred address regions to find where it can allocate the heap. Number of steps to take per region.share/runtime/globals.hpp
HeapSizePerGCThreadJDK6size_tScaleForWordSize(64*M)
range((size_t)os::vm_page_size(), (size_t)max_uintx)
productSize of heap (bytes) per GC thread used in calculating the number of GC threadsshare/runtime/globals.hpp
HotCallCountThresholdJDK6intx999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
developlarge numbers of calls (per method invocation) force hotnessshare/opto/c2_globals.hpp
HotCallProfitThresholdJDK6intx999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
develophighly profitable inlining opportunities force hotnessshare/opto/c2_globals.hpp
HotCallTrivialSizeJDK6intx-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
developtrivial methods (no larger than this) force calls to be hotshare/opto/c2_globals.hpp
HotCallTrivialWorkJDK6intx-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
developtrivial execution time (no larger than this) forces hotnessshare/opto/c2_globals.hpp
HotMethodDetectionLimitJDK9intx100000
range(1, max_jint)
diagnosticNumber of compiled code invocations after which the method is considered as hot by the flushershare/runtime/globals.hpp
HugeMethodLimitJDK6intx8000developDon't compile methods larger than this if +DontCompileHugeMethodsshare/runtime/globals.hpp
ICMissHistogramJDK6boolfalsenotproductProduce histogram of IC missesshare/runtime/globals.hpp
IEEEPrecisionJDK6boolx86truedevelopEnables IEEE precision (for INTEL only)cpu/x86/globals_x86.hpp
INTPRESSUREJDK6intxaarch6424define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
INTPRESSUREJDK6intxarm12define_pd_globalcpu/arm/c2_globals_arm.hpp
INTPRESSUREJDK6intxppc26define_pd_globalcpu/ppc/c2_globals_ppc.hpp
INTPRESSUREJDK6intxs39010define_pd_global// Medium size register set, 6 special purpose regs, 3 SOE regs.cpu/s390/c2_globals_s390.hpp
INTPRESSUREJDK6intxsparc48define_pd_global// large register setcpu/sparc/c2_globals_sparc.hpp
INTPRESSUREJDK6intxx866define_pd_globalcpu/x86/c2_globals_x86.hpp
IdealizeClearArrayNodeJDK9boolaarch64truedefine_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
IdealizeClearArrayNodeJDK9boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
IdealizeClearArrayNodeJDK9boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
IdealizeClearArrayNodeJDK9bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
IdealizeClearArrayNodeJDK9boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
IdealizeClearArrayNodeJDK9boolx86truedefine_pd_globalcpu/x86/c2_globals_x86.hpp
IdealizedNumericsJDK6boolfalsedevelopCheck performance difference allowing FP associativity and commutativity...share/opto/c2_globals.hpp
IgnoreEmptyClassPathsJDK8boolfalseproductIgnore empty path elements in -classpathshare/runtime/globals.hpp
IgnoreLibthreadGPFaultJDK6boolfalsedevelopSuppress workaround for libthread GP faultshare/runtime/globals.hpp
IgnoreLockingAssertionsJDK6boolfalsenotproductdisable locking assertions (for speed)share/runtime/globals.hpp
IgnoreRewritesJDK6boolfalsedevelopSuppress rewrites of bytecodes in the oopmap generator. This is unsafe!share/runtime/globals.hpp
IgnoreUnrecognizedVMOptionsJDK6boolfalseproductIgnore unrecognized VM optionsshare/runtime/globals.hpp
IgnoreUnverifiableClassesDuringDumpJDK8booltruediagnosticDo not quit -Xshare:dump even if we encounter unverifiable classes. Just exclude them from the shared dictionary.share/runtime/globals.hpp
ImplicitDiv0ChecksJDK6booltruedevelopUse implicit division by zero checksshare/c1/c1_globals.hpp
ImplicitNullCheckThresholdJDK6intx3
range(0, max_jint)
developDon't do implicit null checks if NPE's in a method exceeds limitshare/opto/c2_globals.hpp
ImplicitNullChecksJDK6boolaarch64truedefine_pd_global// Generate code for implicit null checkscpu/aarch64/globals_aarch64.hpp
ImplicitNullChecksJDK6boolarmtruedefine_pd_global// Generate code for implicit null checkscpu/arm/globals_arm.hpp
ImplicitNullChecksJDK6boolppctruedefine_pd_global// Generate code for implicit null checks.cpu/ppc/globals_ppc.hpp
ImplicitNullChecksJDK6bools390truedefine_pd_global// Generate code for implicit null checks.cpu/s390/globals_s390.hpp
ImplicitNullChecksJDK6boolsparctruedefine_pd_global// Generate code for implicit null checkscpu/sparc/globals_sparc.hpp
ImplicitNullChecksJDK6boolx86truedefine_pd_global// Generate code for implicit null checkscpu/x86/globals_x86.hpp
ImplicitNullChecksJDK6boolzerotruedefine_pd_globalcpu/zero/globals_zero.hpp
IncreaseFirstTierCompileThresholdAtJDK8uintx50
range(0, 99)
productIncrease the compile threshold for C1 compilation if the code cache is filled by the specified percentageshare/runtime/globals.hpp
IncrementalInlineJDK8booltrueproductdo post parse inliningshare/opto/c2_globals.hpp
IndexSetWatchJDK6intx0
range(-1, 0)
notproductTrace all operations on this IndexSet (-1 means all, 0 none)share/opto/c2_globals.hpp
InitArrayShortSizeJDK9intxaarch64BytesPerLongdefine_pd_globalcpu/aarch64/globals_aarch64.hpp
InitArrayShortSizeJDK9intxarm8*BytesPerLongdefine_pd_globalcpu/arm/globals_arm.hpp
InitArrayShortSizeJDK9intxppc9*BytesPerLongdefine_pd_globalcpu/ppc/globals_ppc.hpp
InitArrayShortSizeJDK9intxs3901*BytesPerLongdefine_pd_globalcpu/s390/globals_s390.hpp
InitArrayShortSizeJDK9intxsparc8*BytesPerLongdefine_pd_globalcpu/sparc/globals_sparc.hpp
InitArrayShortSizeJDK9intxx868*BytesPerLongdefine_pd_globalcpu/x86/globals_x86.hpp
InitArrayShortSizeJDK9intxzero0define_pd_globalcpu/zero/globals_zero.hpp
InitialBootClassLoaderMetaspaceSizeJDK8size_tNOT_LP64(2200*K) LP64_ONLY(4*M)
range(30*K, max_uintx/BytesPerWord)
productInitial size of the boot class loader data metaspaceshare/runtime/globals.hpp
InitialCodeCacheSizeJDK6intxaarch64160*Kdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
InitialCodeCacheSizeJDK6size_tarm1536*Kdefine_pd_global// Integral multiple of CodeCacheExpansionSizecpu/arm/c2_globals_arm.hpp
InitialCodeCacheSizeJDK6uintxnull
range(0, max_uintx)
product_pdInitial code cache size (in bytes)share/runtime/globals.hpp
InitialCodeCacheSizeJDK6intxppc2048*Kdefine_pd_global// Integral multiple of CodeCacheExpansionSizecpu/ppc/c2_globals_ppc.hpp
InitialCodeCacheSizeJDK6uintxs3902048*Kdefine_pd_global// Integral multiple of CodeCacheExpansionSizecpu/s390/c2_globals_s390.hpp
InitialCodeCacheSizeJDK6intxsparc2048*Kdefine_pd_global// Integral multiple of CodeCacheExpansionSizecpu/sparc/c2_globals_sparc.hpp
InitialCodeCacheSizeJDK6intxx86160*Kdefine_pd_globalcpu/x86/c1_globals_x86.hpp
InitialHeapSizeJDK6size_t0productInitial heap size (in bytes); zero means use ergonomicsshare/runtime/globals.hpp
InitialRAMFractionJDK6uintx64
range(1, max_uintx)
productFraction (1/n) of real memory used for initial heap size. Deprecated, use InitialRAMPercentage insteadshare/runtime/globals.hpp
InitialRAMPercentageJDK10double1.5625
range(0.0, 100.0)
productPercentage of real memory used for initial heap sizeshare/runtime/globals.hpp
InitialSurvivorRatioJDK6uintx8
range(0, max_uintx)
productInitial ratio of young generation/survivor space sizeshare/runtime/globals.hpp
InitialTenuringThresholdJDK6uintx7
range(0, markOopDesc::max_age + 1)
productInitial value for tenuring thresholdshare/runtime/globals.hpp
InitiatingHeapOccupancyPercentJDK6uintx45
range(-1, max_intx)
productThe percent occupancy (IHOP) of the current old generation capacity above which a concurrent mark cycle will be initiated Its value may change over time if adaptive IHOP is enabled, otherwise the value remains constant. In the latter case a value of 0 will result as frequent as possible concurrent marking cycles. A value of 100 disables concurrent marking. Fragmentation waste in the old generation is not considered free space in this calculation. (G1 collector only)share/runtime/globals.hpp
InjectGCWorkerCreationFailureJDK9boolfalsediagnosticInject thread creation failures for UseDynamicNumberOfGCThreadsshare/runtime/globals.hpp
InlineAccessorsJDK6booltruedevelopinline accessor methods (get/set)share/opto/c2_globals.hpp
InlineArrayCopyJDK6booltruediagnosticInline arraycopy native that is known to be part of base library DLLshare/runtime/globals.hpp
InlineClassNativesJDK6booltruediagnosticInline Class.isInstance, etcshare/runtime/globals.hpp
InlineDataFileJDK8ccstrNULLproductFile containing inlining replay information[default: ./inline_pid%p.log] (%p replaced with pid)share/runtime/globals.hpp
InlineFrequencyCountJDK6intxaarch64100define_pd_globalcpu/aarch64/globals_aarch64.hpp
InlineFrequencyCountJDK6intxarm50define_pd_globalcpu/arm/globals_arm.hpp
InlineFrequencyCountJDK6intxppc100define_pd_globalcpu/ppc/globals_ppc.hpp
InlineFrequencyCountJDK6intxs390100define_pd_globalcpu/s390/globals_s390.hpp
InlineFrequencyCountJDK6intxsparc50define_pd_global// we can use more inlining on the SPARCcpu/sparc/globals_sparc.hpp
InlineFrequencyCountJDK6intxx86100define_pd_globalcpu/x86/globals_x86.hpp
InlineFrequencyCountJDK6intxzero100define_pd_globalcpu/zero/globals_zero.hpp
InlineFrequencyRatioJDK6intx20
range(0, max_jint)
developRatio of call site execution to caller method invocationshare/runtime/globals.hpp
InlineIntrinsicsJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
InlineIntrinsicsJDK6boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
InlineIntrinsicsJDK6boolfalsedefine_pd_globalshare/runtime/globals.hpp
InlineIntrinsicsJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
InlineIntrinsicsJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
InlineIntrinsicsJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
InlineIntrinsicsJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
InlineMathNativesJDK6booltruediagnosticInline SinD, CosD, etc.share/runtime/globals.hpp
InlineMethodsWithExceptionHandlersJDK6booltruedevelopInline methods containing exception handlers (NOTE: does not work with current backend)share/c1/c1_globals.hpp
InlineNIOCheckIndexJDK6booltruediagnosticIntrinsify java.nio.Buffer.checkIndexshare/c1/c1_globals.hpp
InlineNativesJDK6booltruediagnosticInline natives that are known to be part of base library DLLshare/runtime/globals.hpp
InlineNotifyJDK9booltruediagnosticintrinsify subset of notifyshare/runtime/globals.hpp
InlineObjectCopyJDK6booltruediagnosticinline Object.clone and Arrays.copyOf[Range] intrinsicsshare/opto/c2_globals.hpp
InlineObjectHashJDK6booltruediagnosticInline Object::hashCode() native that is known to be part of base library DLLshare/runtime/globals.hpp
InlineReflectionGetCallerClassJDK6booltruediagnosticinline sun.reflect.Reflection.getCallerClass(), known to be part of base library DLLshare/opto/c2_globals.hpp
InlineSmallCodeJDK6intxaarch641000define_pd_globalcpu/aarch64/globals_aarch64.hpp
InlineSmallCodeJDK6intxarm1500define_pd_globalcpu/arm/globals_arm.hpp
InlineSmallCodeJDK6intxnull
range(0, max_jint)
product_pdOnly inline already compiled methods if their code size is less than thisshare/runtime/globals.hpp
InlineSmallCodeJDK6intxppc1500define_pd_globalcpu/ppc/globals_ppc.hpp
InlineSmallCodeJDK6intxs3902000define_pd_globalcpu/s390/globals_s390.hpp
InlineSmallCodeJDK6intxsparc1500define_pd_globalcpu/sparc/globals_sparc.hpp
InlineSmallCodeJDK6intxx861000define_pd_globalcpu/x86/globals_x86.hpp
InlineSmallCodeJDK6intxzero1000define_pd_globalcpu/zero/globals_zero.hpp
InlineSynchronizedMethodsJDK6booltrueproductInline synchronized methodsshare/c1/c1_globals.hpp
InlineThreadNativesJDK6booltruediagnosticInline Thread.currentThread, etcshare/runtime/globals.hpp
InlineThrowCountJDK6intx50
range(0, max_jint)
developForce inlining of interpreted methods that throw this oftenshare/runtime/globals.hpp
InlineThrowMaxSizeJDK6intx200
range(0, max_jint)
developForce inlining of throwing methods smaller than thisshare/runtime/globals.hpp
InlineUnsafeOpsJDK6booltruediagnosticInline memory ops (native methods) from Unsafeshare/runtime/globals.hpp
InlineWarmCallsJDK6boolfalsedevelopUse a heat-based priority queue to govern inliningshare/opto/c2_globals.hpp
InlineJDK6booltrueproductEnable inliningshare/runtime/globals.hpp
InsertEndGroupPPC64JDK8boolppcfalseproductInsert EndGroup instructions to optimize for Power6.cpu/ppc/globals_ppc.hpp
InsertMemBarAfterArraycopyJDK6booltrueproductInsert memory barrier after arraycopy callshare/opto/c2_globals.hpp
InstallMethodsJDK6booltruedevelopInstall methods at the end of successful compilationsshare/c1/c1_globals.hpp
InstructionCountCutoffJDK6intx37000
range(0, max_jint)
developIf GraphBuilder adds this many instructions, bails outshare/c1/c1_globals.hpp
InterceptOSExceptionJDK6boolfalsedevelopStart debugger when an implicit OS (e.g. NULL) exception happensshare/runtime/globals.hpp
InteriorEntryAlignmentJDK6intxaarch6416define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
InteriorEntryAlignmentJDK6intxarm16define_pd_global// = CodeEntryAlignmentcpu/arm/c2_globals_arm.hpp
InteriorEntryAlignmentJDK6intxnullproduct_pdCode alignment for interior entry points in generated code (in bytes)share/opto/c2_globals.hpp
InteriorEntryAlignmentJDK6intxppc16define_pd_globalcpu/ppc/c2_globals_ppc.hpp
InteriorEntryAlignmentJDK6intxs3902define_pd_globalcpu/s390/c2_globals_s390.hpp
InteriorEntryAlignmentJDK6intxsparc16define_pd_global// = CodeEntryAlignmentcpu/sparc/c2_globals_sparc.hpp
InteriorEntryAlignmentJDK6intxx864define_pd_globalcpu/x86/c2_globals_x86.hpp
InterpreterProfilePercentageJDK6intx33
range(0, 100)
productNON_TIERED number of method invocations/branches (expressed as % of CompileThreshold) before profiling in the interpretershare/runtime/globals.hpp
JVMCICounterSizeJDK9intx0
range(0, max_jint)
experimentalReserved size for benchmark countersshare/jvmci/jvmci_globals.hpp
JVMCICountersExcludeCompilerJDK9booltrueexperimentalExclude JVMCI compiler threads from benchmark countersshare/jvmci/jvmci_globals.hpp
JVMCIHostThreadsJDK9intx1
range(1, max_jint)
experimentalForce number of compiler threads for JVMCI host compilershare/jvmci/jvmci_globals.hpp
JVMCINMethodSizeLimitJDK9intx(80*K)*wordSizeexperimentalMaximum size of a compiled method.share/jvmci/jvmci_globals.hpp
JVMCIPrintPropertiesJDK9boolfalseexperimentalPrints properties used by the JVMCI compiler and exitsshare/jvmci/jvmci_globals.hpp
JVMCIThreadsJDK9intx1
range(1, max_jint)
experimentalForce number of JVMCI compiler threads to useshare/jvmci/jvmci_globals.hpp
JVMCITraceLevelJDK9intx0experimentalTrace level for JVMCI: 1 means emit a message for each CompilerToVM call,levels greater than 1 provide progressively greater detailshare/jvmci/jvmci_globals.hpp
JVMCIUseFastLockingJDK9booltruedevelopUse fast inlined locking codeshare/jvmci/jvmci_globals.hpp
JVMInvokeMethodSlackJDK6size_taixppc8192define_pd_globalos_cpu/aix_ppc/globals_aix_ppc.hpp
JVMInvokeMethodSlackJDK6size_tbsdx868192define_pd_globalos_cpu/bsd_x86/globals_bsd_x86.hpp
JVMInvokeMethodSlackJDK6size_tbsdzero8192define_pd_globalos_cpu/bsd_zero/globals_bsd_zero.hpp
JVMInvokeMethodSlackJDK6uintxlinuxaarch648192define_pd_globalos_cpu/linux_aarch64/globals_linux_aarch64.hpp
JVMInvokeMethodSlackJDK6size_tlinuxarm8192define_pd_globalos_cpu/linux_arm/globals_linux_arm.hpp
JVMInvokeMethodSlackJDK6size_tlinuxppc8192define_pd_globalos_cpu/linux_ppc/globals_linux_ppc.hpp
JVMInvokeMethodSlackJDK6size_tlinuxs3908192define_pd_globalos_cpu/linux_s390/globals_linux_s390.hpp
JVMInvokeMethodSlackJDK6size_tlinuxsparc12288define_pd_globalos_cpu/linux_sparc/globals_linux_sparc.hpp
JVMInvokeMethodSlackJDK6size_tlinuxx868192define_pd_globalos_cpu/linux_x86/globals_linux_x86.hpp
JVMInvokeMethodSlackJDK6size_tlinuxzero8192define_pd_globalos_cpu/linux_zero/globals_linux_zero.hpp
JVMInvokeMethodSlackJDK6size_tsolarissparc12288define_pd_globalos_cpu/solaris_sparc/globals_solaris_sparc.hpp
JVMInvokeMethodSlackJDK6size_tsolarisx8610*Kdefine_pd_globalos_cpu/solaris_x86/globals_solaris_x86.hpp
JVMInvokeMethodSlackJDK6size_twindowsx868192define_pd_globalos_cpu/windows_x86/globals_windows_x86.hpp
JavaMonitorsInStackTraceJDK6booltrueproductPrint information about Java monitor locks when the stacks aredumpedshare/runtime/globals.hpp
JavaPriority10_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority1_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority2_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority3_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority4_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority5_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority6_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority7_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority8_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
JavaPriority9_To_OSPriorityJDK6intx-1
range(-1, 127)
productMap Java priorities to OS prioritiesshare/runtime/globals.hpp
LIRFillDelaySlotsJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
LIRFillDelaySlotsJDK6boolarmfalsedefine_pd_globalcpu/arm/c1_globals_arm.hpp
LIRFillDelaySlotsJDK6boolnullproduct_pdfill delays on on SPARC with LIRshare/c1/c1_globals.hpp
LIRFillDelaySlotsJDK6boolppcfalsedefine_pd_globalcpu/ppc/c1_globals_ppc.hpp
LIRFillDelaySlotsJDK6bools390falsedefine_pd_globalcpu/s390/c1_globals_s390.hpp
LIRFillDelaySlotsJDK6boolsparctruedefine_pd_globalcpu/sparc/c1_globals_sparc.hpp
LIRFillDelaySlotsJDK6boolx86falsedefine_pd_globalcpu/x86/c1_globals_x86.hpp
LIRTraceExecutionJDK6boolfalsedevelopadd LIR code which logs the execution of blocksshare/c1/c1_globals.hpp
LIRTracePeepholeJDK6boolfalsedevelopTrace peephole optimizershare/c1/c1_globals.hpp
LargePageHeapSizeThresholdJDK6size_t128*M
range(0, max_uintx)
productUse large pages if maximum heap is at least this bigshare/runtime/globals.hpp
LargePageSizeInBytesJDK6size_t0
range(0, max_uintx)
productLarge page size (0 to let VM choose the page size)share/runtime/globals.hpp
LargePagesIndividualAllocationInjectErrorJDK6boolfalsedevelopFail large pages individual allocationshare/runtime/globals.hpp
LiveNodeCountInliningCutoffJDK8intx40000
range(0, max_juint / 8)
productmax number of live nodes in a methodshare/opto/c2_globals.hpp
LoadExecStackDllInVMThreadJDK8boollinuxtrueproductLoad DLLs with executable-stack attribute in the VM Threados/linux/globals_linux.hpp
LoadLineNumberTablesJDK6booltruedevelopTell whether the class file parser loads line number tablesshare/runtime/globals.hpp
LoadLocalVariableTablesJDK6booltruedevelopTell whether the class file parser loads local variable tablesshare/runtime/globals.hpp
LoadLocalVariableTypeTablesJDK6booltruedevelopTell whether the class file parser loads local variable typetablesshare/runtime/globals.hpp
LogCompilationJDK6boolfalsediagnosticLog compilation activity in detail to LogFileshare/runtime/globals.hpp
LogEventsBufferEntriesJDK6uintx10
range(1, NOT_LP64(1*K) LP64_ONLY(1*M))
diagnosticNumber of ring buffer event logsshare/runtime/globals.hpp
LogEventsJDK6booltruediagnosticEnable the various ring buffer event logsshare/runtime/globals.hpp
LogFileJDK6ccstrNULLdiagnosticIf LogVMOutput or LogCompilation is on, save VM output to this file [default: ./hotspot_pid%p.log] (%p replaced with pid)share/runtime/globals.hpp
LogSweeperJDK6boolfalsenotproductKeep a ring buffer of sweeper activityshare/runtime/globals.hpp
LogTouchedMethodsJDK9boolfalsediagnosticLog methods which have been ever touched in runtimeshare/runtime/globals.hpp
LogVMOutputJDK6boolfalsediagnosticSave VM output to LogFileshare/runtime/globals.hpp
LongCompileThresholdJDK6intx50developUsed with +TraceLongCompilesshare/runtime/globals.hpp
LoopMaxUnrollJDK8intx16
range(0, max_jint)
productMaximum number of unrolls for main loopshare/opto/c2_globals.hpp
LoopOptsCountJDK6intx43
range(5, 43)
productSet level of loop optimization for tier 1 compilesshare/opto/c2_globals.hpp
LoopPercentProfileLimitJDK9intxaarch6410define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
LoopPercentProfileLimitJDK9intxarm10define_pd_globalcpu/arm/c2_globals_arm.hpp
LoopPercentProfileLimitJDK9intxnull
range(10, 100)
product_pdUnroll loop bodies with % node count of profile limitshare/opto/c2_globals.hpp
LoopPercentProfileLimitJDK9intxppc10define_pd_globalcpu/ppc/c2_globals_ppc.hpp
LoopPercentProfileLimitJDK9intxs39010define_pd_globalcpu/s390/c2_globals_s390.hpp
LoopPercentProfileLimitJDK9intxsparc10define_pd_globalcpu/sparc/c2_globals_sparc.hpp
LoopPercentProfileLimitJDK9intxx8630define_pd_globalcpu/x86/c2_globals_x86.hpp
LoopStripMiningIterShortLoopJDK10uintx0
range(0, max_juint)
productLoop with fewer iterations are not strip minedshare/opto/c2_globals.hpp
LoopStripMiningIterJDK10uintx0
range(0, max_juint)
productNumber of iterations in strip mined loopshare/opto/c2_globals.hpp
LoopUnrollLimitJDK6intxaarch6460define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
LoopUnrollLimitJDK6intxarm60define_pd_global// Design center runs on 1.3.1cpu/arm/c2_globals_arm.hpp
LoopUnrollLimitJDK6intxnull
range(0, max_jint / 4)
product_pdUnroll loop bodies with node count less than thisshare/opto/c2_globals.hpp
LoopUnrollLimitJDK6intxppc60define_pd_globalcpu/ppc/c2_globals_ppc.hpp
LoopUnrollLimitJDK6intxs39060define_pd_globalcpu/s390/c2_globals_s390.hpp
LoopUnrollLimitJDK6intxsparc60define_pd_global// Design center runs on 1.3.1cpu/sparc/c2_globals_sparc.hpp
LoopUnrollLimitJDK6intxx8650define_pd_global// Design center runs on 1.3.1cpu/x86/c2_globals_x86.hpp
LoopUnrollMinJDK6intx4
range(0, max_jint)
productMinimum number of unroll loop bodies before checking progressof rounds of unroll,optimize,..share/opto/c2_globals.hpp
LoopUnswitchingJDK6booltrueproductEnable loop unswitching (a form of invariant test hoisting)share/opto/c2_globals.hpp
MVCLEThresholdJDK9size_ts390+2*(4*K)productThreshold above which page-aligned MVCLE copy/init is used.cpu/s390/globals_s390.hpp
MallocCatchPtrJDK6intx-1developHit breakpoint when mallocing/freeing this pointershare/runtime/globals.hpp
MallocMaxTestWordsJDK8uintx0
range(0, max_uintx)
diagnosticIf non-zero, maximum number of words that malloc/realloc can allocate (for testing only)share/runtime/globals.hpp
ManagementServerJDK6boolfalseproductCreate JMX Management Servershare/runtime/globals.hpp
MarkStackSizeMaxJDK6size_tNOT_LP64(4*M) LP64_ONLY(512*M)
range(1, (max_jint - 1))
productMaximum size of marking stackshare/runtime/globals.hpp
MarkStackSizeJDK6size_tNOT_LP64(32*K) LP64_ONLY(4*M)productSize of marking stackshare/runtime/globals.hpp
MarkSweepAlwaysCompactCountJDK6uint4
range(1, max_juint)
productHow often should we fully compact the heap (ignoring the dead space parameters)share/runtime/globals.hpp
MarkSweepDeadRatioJDK6uintx5
range(0, 100)
productPercentage (0-100) of the old gen allowed as dead wood. Serial mark sweep treats this as both the minimum and maximum value. CMS uses this value only if it falls back to mark sweep. Par compact uses a variable scale based on the density of the generation and treats this as the maximum value when the heap is either completely full or completely empty.Par compact also has a smaller default value; see arguments.cpp.share/runtime/globals.hpp
MaxBCEAEstimateLevelJDK6intx5
range(0, max_jint)
productMaximum number of nested calls that are analyzed by BC EAshare/runtime/globals.hpp
MaxBCEAEstimateSizeJDK6intx150
range(0, max_jint)
productMaximum bytecode size of a method to be analyzed by BC EAshare/runtime/globals.hpp
MaxDirectMemorySizeJDK6uint64_t0
range(0, max_jlong)
productMaximum total size of NIO direct-buffer allocationsshare/runtime/globals.hpp
MaxElementPrintSizeJDK6intx256notproductmaximum number of elements to printshare/runtime/globals.hpp
MaxExpectedDataSegmentSizeJDK9uintxaix8*GproductMaximum expected Data Segment Size.os/aix/globals_aix.hpp
MaxFDLimitJDK6booltrueproductBump the number of file descriptors to maximum in Solarisshare/runtime/globals.hpp
MaxForceInlineLevelJDK8intx100
range(0, max_jint)
developmaximum number of nested calls that are forced for inlining (using CompileCommand or marked w/ @ForceInline)share/runtime/globals.hpp
MaxGCMinorPauseMillisJDK6uintxmax_uintx
range(0, max_uintx)
productAdaptive size policy maximum GC minor pause time goal in millisecondshare/runtime/globals.hpp
MaxGCPauseMillisJDK6uintxmax_uintx - 1
range(1, max_uintx - 1)
productAdaptive size policy maximum GC pause time goal in millisecond, or (G1 Only) the maximum GC time per MMU time sliceshare/runtime/globals.hpp
MaxHeapSizeJDK6size_tScaleForWordSize(96*M)productMaximum heap size (in bytes)share/runtime/globals.hpp
MaxInlineLevelJDK6intx9
range(0, max_jint)
productmaximum number of nested calls that are inlinedshare/runtime/globals.hpp
MaxInlineSizeJDK6intx35
range(0, max_jint)
productThe maximum bytecode size of a method to be inlinedshare/runtime/globals.hpp
MaxInterpretedSearchLengthJDK6intx3developThe maximum number of interpreted frames to skip when searching for recompileeshare/runtime/globals.hpp
MaxJNILocalCapacityJDK8intx65536
range(min_intx, max_intx)
productMaximum allowable local JNI handle capacity to EnsureLocalCapacity() and PushLocalFrame(), where <= 0 is unlimited, default: 65536share/runtime/globals.hpp
MaxJavaStackTraceDepthJDK6intx1024
range(0, max_jint/2)
productThe maximum number of lines in the stack trace for Java exceptions (0 means all)share/runtime/globals.hpp
MaxJumpTableSizeJDK6intx65000
range(0, max_intx)
productMaximum number of targets in a generated jump tableshare/opto/c2_globals.hpp
MaxJumpTableSparsenessJDK6intx5
range(0, max_intx / 4)
productMaximum sparseness for jumptablesshare/opto/c2_globals.hpp
MaxLabelRootDepthJDK6intx1100
range(100, max_jint)
productMaximum times call Label_Root to prevent stack overflowshare/opto/c2_globals.hpp
MaxLoopPadJDK6intx(OptoLoopAlignment-1)
range(0, max_jint)
productAlign a loop if padding size in bytes is less or equal to this valueshare/opto/c2_globals.hpp
MaxMetaspaceExpansionJDK8size_tScaleForWordSize(4*M)
range(0, max_uintx)
productThe maximum expansion of Metaspace without full GC (in bytes)share/runtime/globals.hpp
MaxMetaspaceFreeRatioJDK8uintx70
range(0, 100)
productThe maximum percentage of Metaspace free after GC to avoid shrinkingshare/runtime/globals.hpp
MaxMetaspaceSizeJDK8size_tmax_uintxproductMaximum size of Metaspaces (in bytes)share/runtime/globals.hpp
MaxNewSizeJDK6size_tmax_uintx
range(0, max_uintx)
productMaximum new generation size (in bytes), max_uintx means set ergonomicallyshare/runtime/globals.hpp
MaxNodeLimitJDK6intx80000
range(1000, max_jint / 3)
productMaximum number of nodesshare/opto/c2_globals.hpp
MaxRAMFractionJDK6uintx4
range(1, max_uintx)
productMaximum fraction (1/n) of real memory used for maximum heap size. Deprecated, use MaxRAMPercentage insteadshare/runtime/globals.hpp
MaxRAMPercentageJDK10double25.0
range(0.0, 100.0)
productMaximum percentage of real memory used for maximum heap sizeshare/runtime/globals.hpp
MaxRAMJDK6uint64_taarch641ULL*Gdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
MaxRAMJDK6uint64_tarm4ULL*Gdefine_pd_globalcpu/arm/c2_globals_arm.hpp
MaxRAMJDK6uint64_tnull
range(0, 0XFFFFFFFFFFFFFFFF)
product_pdReal memory size (in bytes) used to set maximum heap sizeshare/runtime/globals.hpp
MaxRAMJDK6uint64_tppc4ULL*Gdefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
MaxRAMJDK6uint64_ts390128ULL*Gdefine_pd_globalcpu/s390/c2_globals_s390.hpp
MaxRAMJDK6uint64_tsparc128ULL*Gdefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
MaxRAMJDK6uint64_tx861ULL*Gdefine_pd_globalcpu/x86/c1_globals_x86.hpp
MaxRecompilationSearchLengthJDK6intx10developThe maximum number of frames to inspect when searching for recompileeshare/runtime/globals.hpp
MaxRecursiveInlineLevelJDK6intx1
range(0, max_jint)
productmaximum number of nested recursive calls that are inlinedshare/runtime/globals.hpp
MaxSubklassPrintSizeJDK6intx4notproductmaximum number of subklasses to print when printing klassshare/runtime/globals.hpp
MaxTenuringThresholdJDK6uintx15
range(0, markOopDesc::max_age + 1)
productMaximum value for tenuring thresholdshare/runtime/globals.hpp
MaxTrivialSizeJDK6intx6
range(0, max_jint)
productThe maximum bytecode size of a trivial method to be inlinedshare/runtime/globals.hpp
MaxVectorSizeJDK8intx64
range(0, max_jint)
productMax vector size in bytes, actual size could be less depending on elements typeshare/opto/c2_globals.hpp
MaxVirtMemFractionJDK8uintx2developMaximum fraction (1/n) of virtual memory used for ergonomically determining maximum heap sizeshare/runtime/globals.hpp
MemProfilingIntervalJDK6intx500notproductTime between each invocation of the MemProfilershare/runtime/globals.hpp
MemProfilingJDK6boolfalsedevelopWrite memory usage profiling to log fileshare/runtime/globals.hpp
MetadataAllocationFailALotIntervalJDK8uintx1000developMetadata allocation failure a lot intervalshare/runtime/globals.hpp
MetadataAllocationFailALotJDK8boolfalsedevelopFail metadata allocations at intervals controlled by MetadataAllocationFailALotIntervalshare/runtime/globals.hpp
MetaspaceSizeJDK8uintxaarch6412*Mdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
MetaspaceSizeJDK8size_tarmScaleForWordSize(16*M)define_pd_globalcpu/arm/c2_globals_arm.hpp
MetaspaceSizeJDK8size_tnullproduct_pdInitial threshold (in bytes) at which a garbage collection is done to reduce Metaspace usageshare/runtime/globals.hpp
MetaspaceSizeJDK8size_tppcScaleForWordSize(16*M)define_pd_globalcpu/ppc/c2_globals_ppc.hpp
MetaspaceSizeJDK8size_ts390ScaleForWordSize(16*M)define_pd_globalcpu/s390/c2_globals_s390.hpp
MetaspaceSizeJDK8size_tsparcScaleForWordSize(16*M)define_pd_globalcpu/sparc/c2_globals_sparc.hpp
MetaspaceSizeJDK8size_tx8612*Mdefine_pd_globalcpu/x86/c1_globals_x86.hpp
MethodFlushingJDK6booltrueproductReclamation of zombie and not-entrant methodsshare/runtime/globals.hpp
MethodHistogramCutoffJDK6intx100developThe cutoff value for method invocation histogram (+CountCalls)share/runtime/globals.hpp
MethodProfileWidthJDK9intx0experimentalNumber of methods to record in call profileshare/jvmci/jvmci_globals.hpp
MinHeapDeltaBytesJDK6size_tScaleForWordSize(128*K)
range(0, max_uintx)
productThe minimum change in heap space due to GC (in bytes)share/runtime/globals.hpp
MinInliningThresholdJDK6intx250
range(0, max_jint)
productThe minimum invocation count a method needs to have to be inlinedshare/runtime/globals.hpp
MinJumpTableSizeJDK6intxaarch6410define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
MinJumpTableSizeJDK6intxarm16define_pd_globalcpu/arm/c2_globals_arm.hpp
MinJumpTableSizeJDK6intxnull
range(0, max_intx)
product_pdMinimum number of targets in a generated jump tableshare/opto/c2_globals.hpp
MinJumpTableSizeJDK6intxppc10define_pd_globalcpu/ppc/c2_globals_ppc.hpp
MinJumpTableSizeJDK6intxs39018define_pd_globalcpu/s390/c2_globals_s390.hpp
MinJumpTableSizeJDK6intxsparc5define_pd_globalcpu/sparc/c2_globals_sparc.hpp
MinJumpTableSizeJDK6intxx8610define_pd_globalcpu/x86/c2_globals_x86.hpp
MinMetaspaceExpansionJDK8size_tScaleForWordSize(256*K)
range(0, max_uintx)
productThe minimum expansion of Metaspace (in bytes)share/runtime/globals.hpp
MinMetaspaceFreeRatioJDK8uintx40
range(0, 99)
productThe minimum percentage of Metaspace free after GC to avoid expansionshare/runtime/globals.hpp
MinOopMapAllocationJDK6intx8developMinimum number of OopMap entries in an OopMapSetshare/runtime/globals.hpp
MinPassesBeforeFlushJDK9intx10
range(0, max_intx)
diagnosticMinimum number of sweeper passes before an nmethod can be flushedshare/runtime/globals.hpp
MinRAMFractionJDK6uintx2
range(1, max_uintx)
productMinimum fraction (1/n) of real memory used for maximum heap size on systems with small physical memory size. Deprecated, use MinRAMPercentage insteadshare/runtime/globals.hpp
MinRAMPercentageJDK10double50.0
range(0.0, 100.0)
productMinimum percentage of real memory used for maximum heapsize on systems with small physical memory sizeshare/runtime/globals.hpp
MinSurvivorRatioJDK6uintx3
range(3, max_uintx)
productMinimum ratio of young generation/survivor space sizeshare/runtime/globals.hpp
MinTLABSizeJDK6size_t2*K
range(1, max_uintx/2)
productMinimum allowed TLAB size (in bytes)share/runtime/globals.hpp
MonitorBoundJDK6intx0
range(0, max_jint)
productBound Monitor populationshare/runtime/globals.hpp
MonitorInUseListsJDK6booltrueproductTrack Monitors for Deflationshare/runtime/globals.hpp
MonitorUsedDeflationThresholdJDK10intx90
range(0, 100)
experimentalPercentage of used monitors before triggering cleanup safepoint which deflates monitors (0 is off). The check is performed on GuaranteedSafepointInterval.share/runtime/globals.hpp
MonomorphicArrayCheckJDK6booltruedevelopUncommon-trap array store checks that require full type checkshare/opto/c2_globals.hpp
MultiArrayExpandLimitJDK6intx6
range(0, max_jint)
productMaximum number of individual allocations in an inline-expanded multianewarray instructionshare/opto/c2_globals.hpp
MustCallLoadClassInternalJDK6boolfalseproductCall loadClassInternal() rather than loadClass()share/runtime/globals.hpp
NMethodSizeLimitJDK6intx(64*K)*wordSize
range(0, max_jint)
developMaximum size of a compiled method.share/c1/c1_globals.hpp
NUMAChunkResizeWeightJDK6uintx20
range(0, 100)
productPercentage (0-100) used to weight the current sample when computing exponentially decaying average for AdaptiveNUMAChunkSizingshare/runtime/globals.hpp
NUMAInterleaveGranularityJDK6size_t2*M
range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G))
productGranularity to use for NUMA interleaving on Windows OSshare/runtime/globals.hpp
NUMAPageScanRateJDK6uintx256
range(0, max_uintx)
productMaximum number of pages to include in the page scan procedureshare/runtime/globals.hpp
NUMASpaceResizeRateJDK6size_t1*G
range(0, max_uintx)
productDo not reallocate more than this amount per collectionshare/runtime/globals.hpp
NUMAStatsJDK6boolfalseproductPrint NUMA stats in detailed heap informationshare/runtime/globals.hpp
NativeMemoryTrackingJDK8ccstroffproductNative memory tracking optionsshare/runtime/globals.hpp
NativeMonitorFlagsJDK6intx0experimental(Unstable)share/runtime/globals.hpp
NativeMonitorSpinLimitJDK6intx20experimental(Unstable)share/runtime/globals.hpp
NativeMonitorTimeoutJDK6intx-1experimental(Unstable)share/runtime/globals.hpp
NearCpoolJDK9boolaarch64trueproductconstant pool is close to instructionscpu/aarch64/globals_aarch64.hpp
NeedsDeoptSuspendJDK6boolaarch64falsedefine_pd_global// only register window machines need thiscpu/aarch64/globals_aarch64.hpp
NeedsDeoptSuspendJDK6boolarmfalsedefine_pd_global// only register window machines need thiscpu/arm/globals_arm.hpp
NeedsDeoptSuspendJDK6boolnullproduct_pdTrue for register window machines (sparc/ia64)share/runtime/globals.hpp
NeedsDeoptSuspendJDK6boolppcfalsedefine_pd_global// Only register window machines need this.cpu/ppc/globals_ppc.hpp
NeedsDeoptSuspendJDK6bools390falsedefine_pd_global// Only register window machines need this.cpu/s390/globals_s390.hpp
NeedsDeoptSuspendJDK6boolsparctruedefine_pd_global// register window machines need thiscpu/sparc/globals_sparc.hpp
NeedsDeoptSuspendJDK6boolx86falsedefine_pd_global// only register window machines need thiscpu/x86/globals_x86.hpp
NeedsDeoptSuspendJDK6boolzerofalsedefine_pd_globalcpu/zero/globals_zero.hpp
NestedInliningSizeRatioJDK6intx90
range(0, 100)
developPercentage of prev. allowed inline size in recursive inliningshare/c1/c1_globals.hpp
NeverActAsServerClassMachineJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
NeverActAsServerClassMachineJDK6boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
NeverActAsServerClassMachineJDK6boolnullproduct_pdNever act like a server-class machineshare/runtime/globals.hpp
NeverActAsServerClassMachineJDK6boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
NeverActAsServerClassMachineJDK6bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
NeverActAsServerClassMachineJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
NeverActAsServerClassMachineJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
NeverTenureJDK6boolfalseproductNever tenure objects in eden, may tenure on overflow (ParallelGC only)share/runtime/globals.hpp
NewCodeParameterJDK6intx0developTesting Only: Create a dedicated integer parameter before putbackshare/runtime/globals.hpp
NewRatioJDK6uintx2
range(0, max_uintx-1)
productRatio of old/new generation sizesshare/runtime/globals.hpp
NewSizeThreadIncreaseJDK6intxaarch644*Kdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
NewSizeThreadIncreaseJDK6size_tarmScaleForWordSize(4*K)define_pd_globalcpu/arm/c2_globals_arm.hpp
NewSizeThreadIncreaseJDK6size_tnull
range(0, max_uintx)
product_pdAdditional size added to desired new generation size per non-daemon thread (in bytes)share/runtime/globals.hpp
NewSizeThreadIncreaseJDK6size_tppcScaleForWordSize(4*K)define_pd_globalcpu/ppc/c2_globals_ppc.hpp
NewSizeThreadIncreaseJDK6size_ts390ScaleForWordSize(4*K)define_pd_globalcpu/s390/c2_globals_s390.hpp
NewSizeThreadIncreaseJDK6size_tsparcScaleForWordSize(4*K)define_pd_globalcpu/sparc/c2_globals_sparc.hpp
NewSizeThreadIncreaseJDK6size_tx864*Kdefine_pd_globalcpu/x86/c1_globals_x86.hpp
NewSizeJDK6size_tScaleForWordSize(1*M)productInitial new generation size (in bytes)share/runtime/globals.hpp
NmethodSweepActivityJDK8intx10
range(0, 2000)
productRemoves cold nmethods from code cache if > 0. Higher values result in more aggressive sweepingshare/runtime/globals.hpp
NodeCountInliningCutoffJDK6intx18000
range(0, max_jint)
developIf parser node generation exceeds limit stop inliningshare/opto/c2_globals.hpp
NodeCountInliningStepJDK6intx1000
range(0, max_jint)
developTarget size of warm calls inlined between optimization passesshare/opto/c2_globals.hpp
NodeLimitFudgeFactorJDK6intx2000productFudge Factor for certain optimizationsshare/opto/c2_globals.hpp
NonNMethodCodeHeapSizeJDK9intxaarch645*Mdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
NonNMethodCodeHeapSizeJDK9size_tarm5*Mdefine_pd_globalcpu/arm/c2_globals_arm.hpp
NonNMethodCodeHeapSizeJDK9uintxnull
range(os::vm_page_size(), max_uintx)
product_pdSize of code heap with non-nmethods (in bytes)share/runtime/globals.hpp
NonNMethodCodeHeapSizeJDK9intxppc5*Mdefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
NonNMethodCodeHeapSizeJDK9uintxs3905*Mdefine_pd_globalcpu/s390/c2_globals_s390.hpp
NonNMethodCodeHeapSizeJDK9intxsparc5*Mdefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
NonNMethodCodeHeapSizeJDK9intxx865*Mdefine_pd_globalcpu/x86/c1_globals_x86.hpp
NonProfiledCodeHeapSizeJDK9intxaarch6413*Mdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
NonProfiledCodeHeapSizeJDK9size_tarm13*Mdefine_pd_globalcpu/arm/c2_globals_arm.hpp
NonProfiledCodeHeapSizeJDK9uintxnull
range(0, max_uintx)
product_pdSize of code heap with non-profiled methods (in bytes)share/runtime/globals.hpp
NonProfiledCodeHeapSizeJDK9intxppc125*Mdefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
NonProfiledCodeHeapSizeJDK9uintxs39021*Mdefine_pd_globalcpu/s390/c2_globals_s390.hpp
NonProfiledCodeHeapSizeJDK9intxsparc21*Mdefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
NonProfiledCodeHeapSizeJDK9intxx8613*Mdefine_pd_globalcpu/x86/c1_globals_x86.hpp
NotifySimulatorJDK9boolaarch64UseBuiltinSimproducttell the AArch64 sim where we are in method codecpu/aarch64/globals_aarch64.hpp
NumberOfLoopInstrToAlignJDK6intx4
range(0, max_jint)
productNumber of first instructions in a loop to alignshare/opto/c2_globals.hpp
OSROnlyBCIJDK6intx-1developOSR only at this bci.Negative values mean exclude that bcishare/runtime/globals.hpp
ObjArrayMarkingStrideJDK6uintx2048developNumber of object array elements to push onto the marking stack before pushing a continuation entryshare/runtime/globals.hpp
ObjectAlignmentInBytesJDK6intx8
range(8, 256)
lp64_productDefault object alignment in bytes, 8 is minimumshare/runtime/globals.hpp
ObjectCountCutOffPercentJDK8double0.5
range(0.0, 100.0)
experimentalThe percentage of the used heap that the instances of a class must occupy for the class to generate a trace eventshare/runtime/globals.hpp
OldPLABSizeJDK6size_t1024productSize of old gen promotion LAB's (in HeapWords), or Number of blocks to attempt to claim when refilling CMS LAB'sshare/runtime/globals.hpp
OldPLABWeightJDK6uintx50
range(0, 100)
productPercentage (0-100) used to weight the current sample when computing exponentially decaying average for resizing OldPLABSizeshare/runtime/globals.hpp
OldSizeJDK6size_tScaleForWordSize(4*M)
range(0, max_uintx)
productInitial tenured generation size (in bytes)share/runtime/globals.hpp
OmitStackTraceInFastThrowJDK6booltrueproductOmit backtraces for some 'hot' exceptions in optimized codeshare/runtime/globals.hpp
OnErrorJDK6ccstrlistRun user-defined commands on fatal error; see VMError.cpp for examplesproductshare/runtime/globals.hpp
OnOutOfMemoryErrorJDK6ccstrlistRun user-defined commands on first java.lang.OutOfMemoryErrorproductshare/runtime/globals.hpp
OnStackReplacePercentageJDK6intxaarch64933define_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
OnStackReplacePercentageJDK6intxarm140define_pd_globalcpu/arm/c2_globals_arm.hpp
OnStackReplacePercentageJDK6intxnullproduct_pdNON_TIERED number of method invocations/branches (expressed as % of CompileThreshold) before (re-)compiling OSR codeshare/runtime/globals.hpp
OnStackReplacePercentageJDK6intxppc140define_pd_globalcpu/ppc/c2_globals_ppc.hpp
OnStackReplacePercentageJDK6intxs390140define_pd_globalcpu/s390/c2_globals_s390.hpp
OnStackReplacePercentageJDK6intxsparc140define_pd_globalcpu/sparc/c2_globals_sparc.hpp
OnStackReplacePercentageJDK6intxx86933define_pd_globalcpu/x86/c1_globals_x86.hpp
OptimizeExpensiveOpsJDK8booltruediagnosticFind best control for expensive operationsshare/opto/c2_globals.hpp
OptimizeFillJDK6booltrue PPC64_ONLY(&& false)productconvert fill/copy loops into intrinsicshare/opto/c2_globals.hpp
OptimizeIfOpsJDK6booltruedevelopOptimize multiple IfOpsshare/c1/c1_globals.hpp
OptimizePollingPageLocationJDK8boolaixtrueproductOptimize the location of the polling page used for Safepointsos/aix/globals_aix.hpp
OptimizePtrCompareJDK6booltrueproductUse escape analysis to optimize pointers compareshare/opto/c2_globals.hpp
OptimizeSinglePrecisionJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
OptimizeSinglePrecisionJDK6boolarmtruedefine_pd_globalcpu/arm/c1_globals_arm.hpp
OptimizeSinglePrecisionJDK6boolppcfalsedefine_pd_globalcpu/ppc/c1_globals_ppc.hpp
OptimizeSinglePrecisionJDK6bools390falsedefine_pd_globalcpu/s390/c1_globals_s390.hpp
OptimizeSinglePrecisionJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c1_globals_sparc.hpp
OptimizeSinglePrecisionJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
OptimizeStringConcatJDK6booltrueproductOptimize the construction of Strings by StringBuildershare/opto/c2_globals.hpp
OptimizeUnsafesJDK6booltruedevelopOptimize raw unsafe opsshare/c1/c1_globals.hpp
OptoBlockListSizeJDK6intx8
range(0, max_jint)
developStarting allocation size of Block_List data structuresshare/opto/c2_globals.hpp
OptoBreakpointC2RJDK6boolfalsenotproductinsert breakpoint at runtime stub entryshare/opto/c2_globals.hpp
OptoBreakpointOSRJDK6boolfalsenotproductinsert breakpoint at osr method entryshare/opto/c2_globals.hpp
OptoBreakpointJDK6boolfalsedevelopinsert breakpoint at method entryshare/opto/c2_globals.hpp
OptoBundlingJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
OptoBundlingJDK6boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
OptoBundlingJDK6boolnullproduct_pdGenerate nops to fill i-cache linesshare/opto/c2_globals.hpp
OptoBundlingJDK6boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
OptoBundlingJDK6bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
OptoBundlingJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
OptoBundlingJDK6boolx86falsedefine_pd_globalcpu/x86/c2_globals_x86.hpp
OptoCoalesceJDK6booltruedevelopUse Conservative Copy Coalescing in the Register Allocatorshare/opto/c2_globals.hpp
OptoLoopAlignmentJDK6intxaarch6416define_pd_globalcpu/aarch64/globals_aarch64.hpp
OptoLoopAlignmentJDK6intxarm16define_pd_globalcpu/arm/globals_arm.hpp
OptoLoopAlignmentJDK6intxnull
range(1, 16)
product_pdAlign inner loops to zero relative to this modulusshare/runtime/globals.hpp
OptoLoopAlignmentJDK6intxppc16define_pd_globalcpu/ppc/globals_ppc.hpp
OptoLoopAlignmentJDK6intxs3902define_pd_globalcpu/s390/globals_s390.hpp
OptoLoopAlignmentJDK6intxsparc16define_pd_global// = 4*wordSizecpu/sparc/globals_sparc.hpp
OptoLoopAlignmentJDK6intxx8616define_pd_globalcpu/x86/globals_x86.hpp
OptoLoopAlignmentJDK6intxzero16define_pd_globalcpu/zero/globals_zero.hpp
OptoNoExecuteJDK6boolfalsenotproductAttempt to parse and compile but do not execute generated codeshare/opto/c2_globals.hpp
OptoNodeListSizeJDK6intx4
range(0, max_jint)
developStarting allocation size of Node_List data structuresshare/opto/c2_globals.hpp
OptoPeepholeAtJDK6intx-1developApply peephole optimizations to this peephole ruleshare/opto/c2_globals.hpp
OptoPeepholeJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
OptoPeepholeJDK6boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
OptoPeepholeJDK6boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
OptoPeepholeJDK6bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
OptoPeepholeJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
OptoPeepholeJDK6boolx86truedefine_pd_globalcpu/x86/c2_globals_x86.hpp
OptoPrologueNopsJDK6intx0
range(0, 128)
developInsert this many extra nop instructions in the prologue of every nmethodshare/opto/c2_globals.hpp
OptoRegSchedulingJDK9boolaarch64falsedefine_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
OptoRegSchedulingJDK9boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
OptoRegSchedulingJDK9boolnullproduct_pdInstruction Scheduling before register allocation for pressureshare/opto/c2_globals.hpp
OptoRegSchedulingJDK9boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
OptoRegSchedulingJDK9bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
OptoRegSchedulingJDK9boolsparcfalsedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
OptoRegSchedulingJDK9boolx86truedefine_pd_globalcpu/x86/c2_globals_x86.hpp
OptoRemoveUselessJDK6booltruedevelopRemove useless nodes after parsingshare/opto/c2_globals.hpp
OptoSchedulingJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
OptoSchedulingJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
OptoSchedulingJDK6boolnullproduct_pdInstruction Scheduling after register allocationshare/opto/c2_globals.hpp
OptoSchedulingJDK6boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
OptoSchedulingJDK6bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
OptoSchedulingJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
OptoSchedulingJDK6boolx86falsedefine_pd_globalcpu/x86/c2_globals_x86.hpp
PLABWeightJDK6uintx75
range(0, 100)
productPercentage (0-100) used to weight the current sample when computing exponentially decaying average for ResizePLABshare/runtime/globals.hpp
PSAdaptiveSizePolicyResizeVirtualSpaceAlotJDK6intx-1
range(-1, 1)
developResize the virtual spaces of the young or old generationsshare/runtime/globals.hpp
PSChunkLargeArraysJDK6booltrueproductProcess large arrays in chunksshare/runtime/globals.hpp
ParGCArrayScanChunkJDK6int50
range(1, max_jint/3)
productScan a subset of object array and push remainder, if array is bigger than thisshare/runtime/globals.hpp
ParGCCardsPerStrideChunkJDK6intx256
range(1, max_intx)
diagnosticThe number of cards in each chunk of the parallel chunks used during card table scanningshare/runtime/globals.hpp
ParGCDesiredObjsFromOverflowListJDK6uintx20
range(0, max_uintx)
productThe desired number of objects to claim from the overflow listshare/runtime/globals.hpp
ParGCStridesPerThreadJDK6uintx2
range(1, max_uintx)
diagnosticThe number of strides per worker thread that we divide up the card table scanning work intoshare/runtime/globals.hpp
ParGCTrimOverflowJDK6booltrueproductEagerly trim the local overflow lists (when ParGCUseLocalOverflow)share/runtime/globals.hpp
ParGCUseLocalOverflowJDK6boolfalseproductInstead of a global overflow list, use local overflow stacksshare/runtime/globals.hpp
ParGCWorkQueueOverflowALotJDK6boolfalsenotproductSimulate work queue overflow in ParNewshare/runtime/globals.hpp
ParGCWorkQueueOverflowIntervalJDK6uintx1000notproductAn `interval' counter that determines how frequently we simulate overflow; a smaller number increases frequencyshare/runtime/globals.hpp
ParallelGCBufferWastePctJDK6uintx10
range(0, 100)
productWasted fraction of parallel allocation buffershare/runtime/globals.hpp
ParallelGCThreadsJDK6uint0productNumber of parallel threads parallel gc will useshare/runtime/globals.hpp
ParallelOldDeadWoodLimiterMeanJDK6uintx50
range(0, 100)
productThe mean used by the parallel compact dead wood limiter (a number between 0-100)share/runtime/globals.hpp
ParallelOldDeadWoodLimiterStdDevJDK6uintx80
range(0, 100)
productThe standard deviation used by the parallel compact dead wood limiter (a number between 0-100)share/runtime/globals.hpp
ParallelRefProcBalancingEnabledJDK6booltrueproductEnable balancing of reference processing queuesshare/runtime/globals.hpp
ParallelRefProcEnabledJDK6boolfalseproductEnable parallel reference processing whenever possibleshare/runtime/globals.hpp
PartialPeelAtUnsignedTestsJDK6booltrueproductPartial peel at unsigned tests if no signed test existsshare/opto/c2_globals.hpp
PartialPeelLoopJDK6booltrueproductPartial peel (rotate) loopsshare/opto/c2_globals.hpp
PartialPeelNewPhiDeltaJDK6intx0
range(0, max_jint)
productAdditional phis that can be created by partial peelingshare/opto/c2_globals.hpp
PatchALotJDK6boolfalsedevelopMarks all fields as having unloaded classesshare/c1/c1_globals.hpp
PauseAtExitJDK6boolfalsediagnosticPause and wait for keypress on exit if a debugger is attachedshare/runtime/globals.hpp
PauseAtStartupFileJDK6ccstrNULLdiagnosticThe file to create and for whose removal to await when pausing at startup. (default: ./vm.paused.)share/runtime/globals.hpp
PauseAtStartupJDK6boolfalsediagnosticCauses the VM to pause at startup time and wait for the pause file to be removed (default: ./vm.paused.)share/runtime/globals.hpp
PausePaddingJDK6uintx1
range(0, max_juint)
productHow much buffer to keep for pause timeshare/runtime/globals.hpp
PerBytecodeRecompilationCutoffJDK6intx200
range(-1, max_intx)
productPer-BCI limit on repeated recompilation (-1=>'Inf')share/runtime/globals.hpp
PerBytecodeTrapLimitJDK6intx4
range(0, max_jint)
productLimit on traps (of one kind) at a particular BCIshare/runtime/globals.hpp
PerMethodRecompilationCutoffJDK6intx400
range(-1, max_intx)
productAfter recompiling N times, stay in the interpreter (-1=>'Inf')share/runtime/globals.hpp
PerMethodSpecTrapLimitJDK8intx5000
range(0, max_jint)
experimentalLimit on speculative traps (of one kind) in a method (includes inlines)share/runtime/globals.hpp
PerMethodTrapLimitJDK6intx100
range(0, max_jint)
productLimit on traps (of one kind) in a method (includes inlines)share/runtime/globals.hpp
PerfAllowAtExitRegistrationJDK6boolfalseproductAllow registration of atexit() methodsshare/runtime/globals.hpp
PerfBypassFileSystemCheckJDK6boolfalseproductBypass Win32 file system criteria checks (Windows Only)share/runtime/globals.hpp
PerfDataMemorySizeJDK6intx32*K
range(128, 32*64*K)
productSize of performance data memory region. Will be rounded up to a multiple of the native os page size.share/runtime/globals.hpp
PerfDataSamplingIntervalJDK6intx50
range(PeriodicTask::min_interval, max_jint)
productData sampling interval (in milliseconds)share/runtime/globals.hpp
PerfDataSaveFileJDK6ccstrNULLproductSave PerfData memory to the specified absolute pathname. The string %p in the file name (if present) will be replaced by pidshare/runtime/globals.hpp
PerfDataSaveToFileJDK6boolfalseproductSave PerfData memory to hsperfdata_ file on exitshare/runtime/globals.hpp
PerfDisableSharedMemJDK6boolfalseproductStore performance data in standard memoryshare/runtime/globals.hpp
PerfMaxStringConstLengthJDK6intx1024
range(32, 32*K)
productMaximum PerfStringConstant string length before truncationshare/runtime/globals.hpp
PinAllInstructionsJDK6boolfalsedevelopAll instructions are pinnedshare/c1/c1_globals.hpp
PoisonOSREntryJDK6booltruedevelopDetect abnormal calls to OSR codeshare/opto/c2_globals.hpp
PostLoopMultiversioningJDK9boolfalseexperimentalMulti versioned post loops to eliminate range checksshare/opto/c2_globals.hpp
PowerArchitecturePPC64JDK8uintxppc0productCPU Version: x for PowerX. Currently recognizes Power5 to Power8. Default is 0. Newer CPUs will be recognized as Power8.cpu/ppc/globals_ppc.hpp
PreTouchParallelChunkSizeJDK9size_t1 * G
range(1, SIZE_MAX / 2)
productPer-thread chunk size for parallel memory pre-touch.share/runtime/globals.hpp
PreallocatedOutOfMemoryErrorCountJDK6uintx4developNumber of OutOfMemoryErrors preallocated with backtraceshare/runtime/globals.hpp
PreferInterpreterNativeStubsJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
PreferInterpreterNativeStubsJDK6boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
PreferInterpreterNativeStubsJDK6boolnullproduct_pdUse always interpreter stubs for native methods invoked via interpretershare/runtime/globals.hpp
PreferInterpreterNativeStubsJDK6boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
PreferInterpreterNativeStubsJDK6bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
PreferInterpreterNativeStubsJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
PreferInterpreterNativeStubsJDK6boolx86falsedefine_pd_globalcpu/x86/c1_globals_x86.hpp
PreferLAoverADDJDK9bools390falseproductUse LA/LAY instructions over ADD instructions (z/Architecture).cpu/s390/globals_s390.hpp
PrefetchCopyIntervalInBytesJDK6intx-1
range(-1, max_jint)
productHow far ahead to prefetch destination area (<= 0 means off)share/runtime/globals.hpp
PrefetchFieldsAheadJDK6intx-1
range(-1, max_jint)
productHow many fields ahead to prefetch in oop scan (<= 0 means off)share/runtime/globals.hpp
PrefetchScanIntervalInBytesJDK6intx-1
range(-1, max_jint)
productHow far ahead to prefetch scan area (<= 0 means off)share/runtime/globals.hpp
PreserveAllAnnotationsJDK6boolfalseproductPreserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotationsshare/runtime/globals.hpp
PreserveFramePointerJDK8boolaarch64falsedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
PreserveFramePointerJDK8boolarmfalsedefine_pd_globalcpu/arm/globals_arm.hpp
PreserveFramePointerJDK8boolnullproduct_pdUse the FP register for holding the frame pointer and not as a general purpose register.share/runtime/globals.hpp
PreserveFramePointerJDK8boolppcfalsedefine_pd_globalcpu/ppc/globals_ppc.hpp
PreserveFramePointerJDK8bools390falsedefine_pd_globalcpu/s390/globals_s390.hpp
PreserveFramePointerJDK8boolsparcfalsedefine_pd_globalcpu/sparc/globals_sparc.hpp
PreserveFramePointerJDK8boolx86falsedefine_pd_globalcpu/x86/globals_x86.hpp
PreserveFramePointerJDK8boolzerofalsedefine_pd_globalcpu/zero/globals_zero.hpp
PretenureSizeThresholdJDK6size_t0
range(0, max_uintx)
productMaximum size in bytes of objects allocated in DefNew generation; zero means no maximumshare/runtime/globals.hpp
PrintAOTStatisticsJDK9boolfalsenotproductPrint AOT statisticsshare/runtime/globals.hpp
PrintAOTJDK9boolfalseproductPrint used AOT klasses and methodsshare/runtime/globals.hpp
PrintAdapterHandlersJDK6boolfalsediagnosticPrint code generated for i2c/c2i adaptersshare/runtime/globals.hpp
PrintAssemblyOptionsJDK6ccstrNULLdiagnosticPrint options string passed to disassembler.soshare/runtime/globals.hpp
PrintAssemblyJDK6boolfalsediagnosticPrint assembly code (using external disassembler.so)share/runtime/globals.hpp
PrintBailoutsJDK6boolfalsedevelopPrint bailout and its reasonshare/c1/c1_globals.hpp
PrintBiasedLockingStatisticsJDK6boolfalsediagnosticPrint statistics of biased locking in JVMshare/runtime/globals.hpp
PrintBlockEliminationJDK6boolfalsedevelopPrint basic block eliminationshare/c1/c1_globals.hpp
PrintBootstrapJDK9booltrueexperimentalPrint JVMCI bootstrap progress and summaryshare/jvmci/jvmci_globals.hpp
PrintBytecodeHistogramJDK6boolfalsedevelopPrint histogram of the executed bytecodesshare/runtime/globals.hpp
PrintBytecodePairHistogramJDK6boolfalsedevelopPrint histogram of the executed bytecode pairsshare/runtime/globals.hpp
PrintC1StatisticsJDK6boolfalsenotproductPrint Compiler1 statisticsshare/c1/c1_globals.hpp
PrintCEEJDK6boolfalsedevelopPrint Conditional Expression Eliminationshare/c1/c1_globals.hpp
PrintCFG0JDK6boolfalsenotproductPrint control flow graph after constructionshare/c1/c1_globals.hpp
PrintCFG1JDK6boolfalsenotproductPrint control flow graph after optimizationsshare/c1/c1_globals.hpp
PrintCFG2JDK6boolfalsenotproductPrint control flow graph before code generationshare/c1/c1_globals.hpp
PrintCFGBlockFreqJDK6boolfalsedevelopPrint CFG block freqenciesshare/opto/c2_globals.hpp
PrintCFGToFileJDK6boolfalsedevelopprint control flow graph to a separate file during compilationshare/c1/c1_globals.hpp
PrintCFGJDK6boolfalsenotproductPrint control flow graph after each changeshare/c1/c1_globals.hpp
PrintCanonicalizationJDK6boolfalsedevelopPrint graph node canonicalizationshare/c1/c1_globals.hpp
PrintCodeCache2JDK6boolfalsedevelopPrint detailed usage information on the code cache when exitingshare/runtime/globals.hpp
PrintCodeCacheExtensionJDK6boolfalsedevelopPrint extension of code cacheshare/runtime/globals.hpp
PrintCodeCacheOnCompilationJDK8boolfalseproductPrint the code cache memory usage each time a method is compiledshare/runtime/globals.hpp
PrintCodeCacheJDK6boolfalseproductPrint the code cache memory usage when exitingshare/runtime/globals.hpp
PrintCommandLineFlagsJDK6boolfalseproductPrint flags specified on command line or set by ergonomicsshare/runtime/globals.hpp
PrintCompilation2JDK6boolfalsediagnosticPrint additional statistics per compilationshare/runtime/globals.hpp
PrintCompilationJDK6boolfalseproductPrint compilationsshare/runtime/globals.hpp
PrintDebugInfoJDK6boolfalsedevelopPrint debug information for all nmethods when generatedshare/runtime/globals.hpp
PrintDeoptimizationDetailsJDK9boolfalsedevelopPrint more information about deoptimizationshare/runtime/globals.hpp
PrintDependenciesJDK6boolfalsedevelopPrint dependency information for all nmethods when generatedshare/runtime/globals.hpp
PrintDominatorsJDK6boolfalsedevelopPrint out dominator trees for GVNshare/opto/c2_globals.hpp
PrintEliminateAllocationsJDK6boolfalsenotproductPrint out when allocations are eliminatedshare/opto/c2_globals.hpp
PrintEliminateLocksJDK6boolfalsenotproductPrint out when locks are eliminatedshare/opto/c2_globals.hpp
PrintEscapeAnalysisJDK6boolfalsenotproductPrint the results of escape analysisshare/opto/c2_globals.hpp
PrintExceptionHandlersJDK6boolfalsedevelopPrint exception handler tables for all nmethods when generatedshare/runtime/globals.hpp
PrintFieldLayoutJDK8boolfalsenotproductPrint field layout for each classshare/runtime/globals.hpp
PrintFlagsFinalJDK6boolfalseproductPrint all VM flags after argument and ergonomic processingshare/runtime/globals.hpp
PrintFlagsInitialJDK6boolfalseproductPrint all VM flags before argument processing and exit VMshare/runtime/globals.hpp
PrintFlagsRangesJDK9boolfalseproductPrint VM flags and their ranges and exit VMshare/runtime/globals.hpp
PrintFlagsWithCommentsJDK6boolfalsenotproductPrint all VM flags with default values and descriptions and exitshare/runtime/globals.hpp
PrintFrameConverterAssemblyJDK6boolfalsenotproductPrint New compiler assembly output for frame convertersshare/opto/c2_globals.hpp
PrintGCDetailsJDK9boolfalseproductPrint more details at garbage collection. Deprecated, use -Xlog:gc* instead.share/runtime/globals.hpp
PrintGCJDK9boolfalseproductPrint message at garbage collection. Deprecated, use -Xlog:gc instead.share/runtime/globals.hpp
PrintHeapAtSIGBREAKJDK6booltrueproductPrint heap layout in response to SIGBREAKshare/runtime/globals.hpp
PrintIR0JDK6boolfalsenotproductPrint full intermediate representation after constructionshare/c1/c1_globals.hpp
PrintIR1JDK6boolfalsenotproductPrint full intermediate representation after optimizationsshare/c1/c1_globals.hpp
PrintIR2JDK6boolfalsenotproductPrint full intermediate representation before code generationshare/c1/c1_globals.hpp
PrintIRDuringConstructionJDK6boolfalsenotproductPrint IR as it's being constructed (helpful for debugging frontend)share/c1/c1_globals.hpp
PrintIRWithLIRJDK6boolfalsenotproductPrint IR instructions with generated LIRshare/c1/c1_globals.hpp
PrintIRJDK6boolfalsenotproductPrint full intermediate representation after each changeshare/c1/c1_globals.hpp
PrintIdealGraphAddressJDK6ccstr127.0.0.1notproductIP address to connect to visualizershare/opto/c2_globals.hpp
PrintIdealGraphFileJDK6ccstrNULLnotproductFile to dump ideal graph to.If set overrides the use of the networkshare/opto/c2_globals.hpp
PrintIdealGraphLevelJDK6intx0
range(0, 4)
notproductLevel of detail of the ideal graph printout. System-wide value, 0=nothing is printed, 4=all details printed. Level of detail of printouts can be set on a per-method level as well by using CompileCommand=option.share/opto/c2_globals.hpp
PrintIdealGraphPortJDK6intx4444
range(0, SHRT_MAX)
notproductIdeal graph printer to network portshare/opto/c2_globals.hpp
PrintIdealGraphJDK9boolfalsenotproductPrint ideal graph to XML file / network interface. By default attempts to connect to the visualizer on a socket.share/opto/c2_globals.hpp
PrintIdealNodeCountJDK8boolfalsenotproductPrint liveness counts of ideal nodesshare/opto/c2_globals.hpp
PrintIdealJDK6boolfalsenotproductPrint ideal graph before code generationshare/opto/c2_globals.hpp
PrintInitialBlockListJDK6boolfalsenotproductPrint block list of BlockListBuildershare/c1/c1_globals.hpp
PrintInliningJDK6boolfalsediagnosticPrint inlining optimizationsshare/runtime/globals.hpp
PrintInterpreterJDK6boolfalsediagnosticPrint the generated interpreter codeshare/runtime/globals.hpp
PrintIntrinsicsJDK6boolfalsediagnosticprints attempted and successful inlining of intrinsicsshare/opto/c2_globals.hpp
PrintJNIResolvingJDK6boolfalseproductUsed to implement -v:jnishare/runtime/globals.hpp
PrintLIRWithAssemblyJDK6boolfalsenotproductShow LIR instruction with generated assemblyshare/c1/c1_globals.hpp
PrintLIRJDK6boolfalsedevelopprint low-level IRshare/c1/c1_globals.hpp
PrintLockStatisticsJDK6boolfalsenotproductPrint precise statistics on the dynamic lock usageshare/opto/c2_globals.hpp
PrintMallocFreeJDK6boolfalsenotproductTrace calls to C heap malloc/free allocationshare/runtime/globals.hpp
PrintMallocStatisticsJDK6boolfalsedevelopPrint malloc/free statisticsshare/runtime/globals.hpp
PrintMallocJDK6boolfalsedevelopPrint all malloc/free callsshare/runtime/globals.hpp
PrintMethodDataJDK6boolfalsediagnosticPrint the results of +ProfileInterpreter at end of runshare/runtime/globals.hpp
PrintMethodFlushingStatisticsJDK8boolfalsediagnosticprint statistics about method flushingshare/runtime/globals.hpp
PrintMethodFlushingJDK6boolfalsedevelopPrint the nmethods being flushedshare/runtime/globals.hpp
PrintMethodHandleStubsJDK6boolfalsediagnosticPrint generated stub code for method handlesshare/runtime/globals.hpp
PrintMiscellaneousJDK6boolfalsedevelopPrint uncategorized debugging information (requires +Verbose)share/runtime/globals.hpp
PrintNMTStatisticsJDK8boolfalsediagnosticPrint native memory tracking summary data if it is onshare/runtime/globals.hpp
PrintNMethodStatisticsJDK9boolfalsenotproductPrint a summary statistic for the generated nmethodsshare/runtime/globals.hpp
PrintNMethodsJDK6boolfalsediagnosticPrint assembly code for nmethods when generatedshare/runtime/globals.hpp
PrintNativeNMethodsJDK6boolfalsediagnosticPrint assembly code for native nmethods when generatedshare/runtime/globals.hpp
PrintNotLoadedJDK6boolfalsedevelopPrints where classes are not loaded during code generationshare/c1/c1_globals.hpp
PrintNullCheckEliminationJDK6boolfalsedevelopPrint null check eliminationshare/c1/c1_globals.hpp
PrintOptimizePtrCompareJDK6boolfalsenotproductPrint information about optimized pointers compareshare/opto/c2_globals.hpp
PrintOptimizeStringConcatJDK6boolfalsenotproductPrint information about transformations performed on Stringsshare/opto/c2_globals.hpp
PrintOptoAssemblyJDK6boolfalsediagnosticPrint New compiler assembly outputshare/opto/c2_globals.hpp
PrintOptoInliningJDK6boolfalsenotproductPrint compiler2 inlining decisionsshare/opto/c2_globals.hpp
PrintOptoPeepholeJDK6boolfalsenotproductPrint New compiler peephole replacementsshare/opto/c2_globals.hpp
PrintOptoStatisticsJDK6boolfalsenotproductPrint New compiler statisticsshare/opto/c2_globals.hpp
PrintOptoJDK6boolfalsenotproductPrint compiler2 attemptsshare/opto/c2_globals.hpp
PrintParseStatisticsJDK6boolfalsenotproductPrint nodes, transforms and new values made per bytecode parsedshare/opto/c2_globals.hpp
PrintPhiFunctionsJDK6boolfalsenotproductPrint phi functions when they are created and simplifiedshare/c1/c1_globals.hpp
PrintPreciseBiasedLockingStatisticsJDK6boolfalsediagnosticPrint per-lock-site statistics of biased locking in JVMshare/opto/c2_globals.hpp
PrintPreciseRTMLockingStatisticsJDK8boolfalsediagnosticPrint per-lock-site statistics of rtm locking in JVMshare/opto/c2_globals.hpp
PrintRelocationsJDK6boolfalsedevelopPrint relocation information for all nmethods when generatedshare/runtime/globals.hpp
PrintRewritesJDK6boolfalsenotproductPrint methods that are being rewrittenshare/runtime/globals.hpp
PrintSafepointStatisticsCountJDK6intx300
range(1, max_intx)
productTotal number of safepoint statistics collected before printing them outshare/runtime/globals.hpp
PrintSafepointStatisticsTimeoutJDK6intx-1productPrint safepoint statistics only when safepoint takes more than PrintSafepointSatisticsTimeout in millisshare/runtime/globals.hpp
PrintSafepointStatisticsJDK6boolfalseproductPrint statistics about safepoint synchronizationshare/runtime/globals.hpp
PrintSharedArchiveAndExitJDK8boolfalseproductPrint shared archive file contentsshare/runtime/globals.hpp
PrintSharedDictionaryJDK8boolfalseproductIf PrintSharedArchiveAndExit is true, also print the shared dictionaryshare/runtime/globals.hpp
PrintSignatureHandlersJDK6boolfalsediagnosticPrint code generated for native method signature handlersshare/runtime/globals.hpp
PrintSimpleStubsJDK6boolfalsenotproductPrint SimpleStubsshare/c1/c1_globals.hpp
PrintStringTableStatisticsJDK6boolfalseproductprint statistics about the StringTable and SymbolTableshare/runtime/globals.hpp
PrintStubCodeJDK6boolfalsediagnosticPrint generated stub codeshare/runtime/globals.hpp
PrintSymbolTableSizeHistogramJDK6boolfalsenotproductprint histogram of the symbol tableshare/runtime/globals.hpp
PrintSystemDictionaryAtExitJDK6boolfalsenotproductPrint the system dictionary at exitshare/runtime/globals.hpp
PrintTieredEventsJDK6boolfalseproductPrint tiered events notificationsshare/runtime/globals.hpp
PrintTouchedMethodsAtExitJDK9boolfalsediagnosticPrint all methods that have been ever touched in runtimeshare/runtime/globals.hpp
PrintUnsafeOptimizationJDK6boolfalsedevelopPrint optimization of raw unsafe opsshare/c1/c1_globals.hpp
PrintVMMessagesJDK6booltruedevelopPrint VM messages on consoleshare/runtime/globals.hpp
PrintVMOptionsJDK6boolfalseproductPrint flags that appeared on the command lineshare/runtime/globals.hpp
PrintVMQWaitTimeJDK6boolfalseproductPrint out the waiting time in VM operation queueshare/runtime/globals.hpp
PrintValueNumberingJDK6boolfalsedevelopPrint Value Numberingshare/c1/c1_globals.hpp
PrintVtableStatsJDK6boolfalsenotproductprint vtables stats at end of runshare/runtime/globals.hpp
PrintWarningsJDK6booltrueproductPrint JVM warnings to output streamshare/runtime/globals.hpp
ProcessDistributionStrideJDK6uintx4
range(0, max_juint)
productStride through processors when distributing processesshare/runtime/globals.hpp
ProfileDynamicTypesJDK6booltruediagnosticdo extra type profiling and use it more aggressivelyshare/opto/c2_globals.hpp
ProfileInterpreterJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
ProfileInterpreterJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
ProfileInterpreterJDK6boolnullproduct_pdProfile at the bytecode level during interpretationshare/runtime/globals.hpp
ProfileInterpreterJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
ProfileInterpreterJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
ProfileInterpreterJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
ProfileInterpreterJDK6boolx86falsedefine_pd_globalcpu/x86/c1_globals_x86.hpp
ProfileIntervalsTicksJDK6intx100
range(0, max_intx)
productNumber of ticks between printing of interval profile (+ProfileIntervals)share/runtime/globals.hpp
ProfileIntervalsJDK6boolfalseproductPrint profiles for each interval (see ProfileIntervalsTicks)share/runtime/globals.hpp
ProfileMaturityPercentageJDK6intx20
range(0, 100)
productnumber of method invocations/branches (expressed as % of CompileThreshold) before using the method's profileshare/runtime/globals.hpp
ProfileTrapsJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
ProfileTrapsJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
ProfileTrapsJDK6boolfalsedefine_pd_globalshare/runtime/globals.hpp
ProfileTrapsJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
ProfileTrapsJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
ProfileTrapsJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
ProfileTrapsJDK6boolx86falsedefine_pd_globalcpu/x86/c1_globals_x86.hpp
ProfileVMJDK6boolfalseproductProfile ticks that fall within VM (either in the VM Thread or VM code called through stubs)share/runtime/globals.hpp
ProfiledCodeHeapSizeJDK9intxaarch6414*Mdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
ProfiledCodeHeapSizeJDK9size_tarm14*Mdefine_pd_globalcpu/arm/c2_globals_arm.hpp
ProfiledCodeHeapSizeJDK9uintxnull
range(0, max_uintx)
product_pdSize of code heap with profiled methods (in bytes)share/runtime/globals.hpp
ProfiledCodeHeapSizeJDK9intxppc126*Mdefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
ProfiledCodeHeapSizeJDK9uintxs39022*Mdefine_pd_globalcpu/s390/c2_globals_s390.hpp
ProfiledCodeHeapSizeJDK9intxsparc22*Mdefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
ProfiledCodeHeapSizeJDK9intxx8614*Mdefine_pd_globalcpu/x86/c1_globals_x86.hpp
ProfilerCheckIntervalsJDK6boolfalsenotproductCollect and print information on spacing of profiler ticksshare/runtime/globals.hpp
ProfilerNodeSizeJDK6intx1024
range(0, 1024)
developSize in K to allocate for the Profile Nodes of each threadshare/runtime/globals.hpp
ProfilerNumberOfCompiledMethodsJDK6intx25diagnosticNumber of compiled methods to show in profileshare/runtime/globals.hpp
ProfilerNumberOfInterpretedMethodsJDK6intx25diagnosticNumber of interpreted methods to show in profileshare/runtime/globals.hpp
ProfilerNumberOfRuntimeStubNodesJDK6intx25diagnosticNumber of runtime stub nodes to show in profileshare/runtime/globals.hpp
ProfilerNumberOfStubMethodsJDK6intx25diagnosticNumber of stub methods to show in profileshare/runtime/globals.hpp
ProfilerPCTickThresholdJDK6intx15developNumber of ticks in a PC buckets to be a hotspotshare/runtime/globals.hpp
ProfilerPrintByteCodeStatisticsJDK6boolfalseproductPrint bytecode statistics when dumping profiler outputshare/runtime/globals.hpp
ProfilerRecordPCJDK6boolfalseproductCollect ticks for each 16 byte interval of compiled codeshare/runtime/globals.hpp
PromotedPaddingJDK6uintx3
range(0, max_juint)
productHow much buffer to keep for promotion failureshare/runtime/globals.hpp
PromotionFailureALotCountJDK6uintx1000developNumber of promotion failures occurring at PLAB refill attempts (ParNew) or promotion attempts (other young collectors)share/runtime/globals.hpp
PromotionFailureALotIntervalJDK6uintx5developTotal collections between promotion failures a lotshare/runtime/globals.hpp
PromotionFailureALotJDK6boolfalsenotproductUse promotion failure handling on every youngest generation collectionshare/runtime/globals.hpp
ProtectionDomainVerificationJDK6booltruedevelopVerify protection domain before resolution in system dictionaryshare/runtime/globals.hpp
QueuedAllocationWarningCountJDK6uintx0
range(0, max_uintx)
productNumber of times an allocation that queues behind a GC will retry before printing a warningshare/runtime/globals.hpp
RTMAbortRatioJDK8intppc50
range(0, 100) /* natural range */
experimentalLock abort ratio at which to stop use RTM lock elidingcpu/ppc/globals_ppc.hpp
RTMAbortRatioJDK8intx8650
range(0, 100) /* natural range */
experimentalLock abort ratio at which to stop use RTM lock elidingcpu/x86/globals_x86.hpp
RTMAbortThresholdJDK8intppc1000
range(0, max_jint)
experimentalCalculate abort ratio after this number of abortscpu/ppc/globals_ppc.hpp
RTMAbortThresholdJDK8intx861000
range(0, max_jint)
experimentalCalculate abort ratio after this number of abortscpu/x86/globals_x86.hpp
RTMLockingCalculationDelayJDK8intxppc0experimentalNumber of milliseconds to wait before start calculating aborts for RTM lockingcpu/ppc/globals_ppc.hpp
RTMLockingCalculationDelayJDK8intxx860experimentalNumber of milliseconds to wait before start calculating aborts for RTM lockingcpu/x86/globals_x86.hpp
RTMLockingThresholdJDK8intppc10000
range(0, max_jint)
experimentalLock count at which to do RTM lock eliding without abort ratio calculationcpu/ppc/globals_ppc.hpp
RTMLockingThresholdJDK8intx8610000
range(0, max_jint)
experimentalLock count at which to do RTM lock eliding without abort ratio calculationcpu/x86/globals_x86.hpp
RTMRetryCountJDK8intppc5
range(0, max_jint)
productNumber of RTM retries on lock abort or busycpu/ppc/globals_ppc.hpp
RTMRetryCountJDK8intx865
range(0, max_jint)
productNumber of RTM retries on lock abort or busycpu/x86/globals_x86.hpp
RTMSpinLoopCountJDK8intppc100
range(0, 32767) /* immediate operand limit on ppc */
experimentalSpin count for lock to become free before RTM retrycpu/ppc/globals_ppc.hpp
RTMSpinLoopCountJDK8intx86100
range(0, max_jint)
experimentalSpin count for lock to become free before RTM retrycpu/x86/globals_x86.hpp
RTMTotalCountIncrRateJDK8intppc64
range(1, 32767) /* immediate operand limit on ppc */
experimentalIncrement total RTM attempted lock count once every n timescpu/ppc/globals_ppc.hpp
RTMTotalCountIncrRateJDK8intx8664
range(1, max_jint)
experimentalIncrement total RTM attempted lock count once every n timescpu/x86/globals_x86.hpp
RangeCheckEliminationJDK6booltrueproductEliminate range checksshare/runtime/globals.hpp
ReassociateInvariantsJDK6booltrueproductEnable reassociation of expressions with loop invariants.share/opto/c2_globals.hpp
ReduceBulkZeroingJDK6booltrueproductWhen bulk-initializing, try to avoid needless zeroingshare/opto/c2_globals.hpp
ReduceFieldZeroingJDK6booltrueproductWhen initializing fields, try to avoid needless zeroingshare/opto/c2_globals.hpp
ReduceInitialCardMarksJDK6booltrueproductWhen initializing fields, try to avoid needless card marksshare/opto/c2_globals.hpp
ReduceSignalUsageJDK6boolfalseproductReduce the use of OS signals in Java and/or the VMshare/runtime/globals.hpp
RefDiscoveryPolicyJDK6intx0
range(ReferenceProcessor::DiscoveryPolicyMin,
productSelect type of reference discovery policy: reference-based(0) or referent-based(1)share/runtime/globals.hpp
RegisterCostAreaRatioJDK6intxaarch6416000define_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
RegisterCostAreaRatioJDK6intxarm16000define_pd_globalcpu/arm/c2_globals_arm.hpp
RegisterCostAreaRatioJDK6intxppc16000define_pd_globalcpu/ppc/c2_globals_ppc.hpp
RegisterCostAreaRatioJDK6intxs39012000define_pd_globalcpu/s390/c2_globals_s390.hpp
RegisterCostAreaRatioJDK6intxsparc12000define_pd_globalcpu/sparc/c2_globals_sparc.hpp
RegisterCostAreaRatioJDK6intxx8616000define_pd_globalcpu/x86/c2_globals_x86.hpp
RegisterFinalizersAtInitJDK6booltrueproductRegister finalizable objects at end of Object. or after allocationshare/runtime/globals.hpp
RegisterReferencesJDK6booltruedevelopTell whether the VM should register soft/weak/final/phantom referencesshare/runtime/globals.hpp
RelaxAccessControlCheckJDK6boolfalseproductRelax the access control checks in the verifiershare/runtime/globals.hpp
RenumberLiveNodesJDK8booltruedevelopRenumber live nodesshare/opto/c2_globals.hpp
ReoptimizeCallSequencesJDK8boolppctrueproductReoptimize code-sequences of calls at runtime.cpu/ppc/globals_ppc.hpp
ReoptimizeCallSequencesJDK8bools390trueproductReoptimize code-sequences of calls at runtime.cpu/s390/globals_s390.hpp
ReplayCompilesJDK8boolfalsedevelopEnable replay of compilations from ReplayDataFileshare/runtime/globals.hpp
ReplayDataFileJDK8ccstrNULLproductFile containing compilation replay information[default: ./replay_pid%p.log] (%p replaced with pid)share/runtime/globals.hpp
ReplayIgnoreInitErrorsJDK8boolfalsedevelopIgnore exceptions thrown during initialization for replayshare/runtime/globals.hpp
ReplaySuppressInitializersJDK8intx2
range(0, 3)
developControl handling of class initialization during replay: 0 - don't do anything special; 1 - treat all class initializers as empty; 2 - treat class initializers for application classes as empty; 3 - allow all class initializers to run during bootstrap but pretend they are empty after starting replayshare/runtime/globals.hpp
RequireSharedSpacesJDK6boolfalseproductRequire shared spaces for metadatashare/runtime/globals.hpp
ReservedCodeCacheSizeJDK6intxaarch6432*Mdefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
ReservedCodeCacheSizeJDK6size_tarm32*Mdefine_pd_globalcpu/arm/c2_globals_arm.hpp
ReservedCodeCacheSizeJDK6uintxnull
range(os::vm_page_size(), max_uintx)
product_pdReserved code cache size (in bytes) - maximum code cache sizeshare/runtime/globals.hpp
ReservedCodeCacheSizeJDK6intxppc256*Mdefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
ReservedCodeCacheSizeJDK6uintxs39048*Mdefine_pd_globalcpu/s390/c2_globals_s390.hpp
ReservedCodeCacheSizeJDK6intxsparc48*Mdefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
ReservedCodeCacheSizeJDK6intxx8632*Mdefine_pd_globalcpu/x86/c1_globals_x86.hpp
ResizeOldPLABJDK6booltrueproductDynamically resize (old gen) promotion LAB'sshare/runtime/globals.hpp
ResizePLABJDK6booltrueproductDynamically resize (survivor space) promotion LAB'sshare/runtime/globals.hpp
ResizeTLABJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
ResizeTLABJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
ResizeTLABJDK6boolnullproduct_pdDynamically resize TLAB size for threadsshare/runtime/globals.hpp
ResizeTLABJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
ResizeTLABJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
ResizeTLABJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
ResizeTLABJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
RestoreMXCSROnJNICallsJDK6boolfalseproductRestore MXCSR when returning from JNI callsshare/runtime/globals.hpp
RestrictContendedJDK8booltrueproductRestrict @Contended to trusted classesshare/runtime/globals.hpp
RestrictReservedStackJDK9booltrueproductRestrict @ReservedStackAccess to trusted classesshare/runtime/globals.hpp
RewriteBytecodesJDK6boolaarch64truedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
RewriteBytecodesJDK6boolarmtruedefine_pd_globalcpu/arm/globals_arm.hpp
RewriteBytecodesJDK6boolnullproduct_pdAllow rewriting of bytecodes (bytecodes are not immutable)share/runtime/globals.hpp
RewriteBytecodesJDK6boolppctruedefine_pd_globalcpu/ppc/globals_ppc.hpp
RewriteBytecodesJDK6bools390truedefine_pd_globalcpu/s390/globals_s390.hpp
RewriteBytecodesJDK6boolsparctruedefine_pd_globalcpu/sparc/globals_sparc.hpp
RewriteBytecodesJDK6boolx86truedefine_pd_globalcpu/x86/globals_x86.hpp
RewriteBytecodesJDK6boolzerotruedefine_pd_globalcpu/zero/globals_zero.hpp
RewriteFrequentPairsJDK6boolaarch64truedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
RewriteFrequentPairsJDK6boolarmtruedefine_pd_globalcpu/arm/globals_arm.hpp
RewriteFrequentPairsJDK6boolnullproduct_pdRewrite frequently used bytecode pairs into a single bytecodeshare/runtime/globals.hpp
RewriteFrequentPairsJDK6boolppctruedefine_pd_globalcpu/ppc/globals_ppc.hpp
RewriteFrequentPairsJDK6bools390truedefine_pd_globalcpu/s390/globals_s390.hpp
RewriteFrequentPairsJDK6boolsparctruedefine_pd_globalcpu/sparc/globals_sparc.hpp
RewriteFrequentPairsJDK6boolx86truedefine_pd_globalcpu/x86/globals_x86.hpp
RewriteFrequentPairsJDK6boolzerotruedefine_pd_globalcpu/zero/globals_zero.hpp
RoundFPResultsJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
RoundFPResultsJDK6boolarmfalsedefine_pd_globalcpu/arm/c1_globals_arm.hpp
RoundFPResultsJDK6boolppcfalsedefine_pd_globalcpu/ppc/c1_globals_ppc.hpp
RoundFPResultsJDK6bools390falsedefine_pd_globalcpu/s390/c1_globals_s390.hpp
RoundFPResultsJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c1_globals_sparc.hpp
RoundFPResultsJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
SafepointALotJDK6boolfalsedevelopGenerate a lot of safepoints. This works with GuaranteedSafepointIntervalshare/runtime/globals.hpp
SafepointSpinBeforeYieldJDK6intx2000
range(0, max_intx)
product(Unstable, Deprecated)share/runtime/globals.hpp
SafepointTimeoutDelayJDK6intx10000productDelay in milliseconds for option SafepointTimeoutshare/runtime/globals.hpp
SafepointTimeoutJDK6boolfalseproductTime out and warn or fail after SafepointTimeoutDelay milliseconds if failed to reach safepointshare/runtime/globals.hpp
ScavengeALotIntervalJDK6intx1notproductInterval between which scavenge will occur with +ScavengeALotshare/runtime/globals.hpp
ScavengeALotJDK6boolfalsenotproductForce scavenge at every Nth exit from the runtime system (N=ScavengeALotInterval)share/runtime/globals.hpp
ScavengeBeforeFullGCJDK6booltrueproductScavenge youngest generation before each full GC.share/runtime/globals.hpp
ScavengeRootsInCodeJDK6intx2
range(0, 2)
diagnostic0: do not allow scavengable oops in the code cache; 1: allow scavenging from the code cache; 2: emit as many constants as the compiler can seeshare/runtime/globals.hpp
SegmentedCodeCacheJDK9boolfalseproductUse a segmented code cacheshare/runtime/globals.hpp
SelectivePhiFunctionsJDK6booltruedevelopcreate phi functions at loop headers only when necessaryshare/c1/c1_globals.hpp
SelfDestructTimerJDK6intx0
range(0, max_intx)
productWill cause VM to terminate after a given time (in minutes) (0 means off)share/runtime/globals.hpp
SerializeVMOutputJDK6booltruediagnosticUse a mutex to serialize output to tty and LogFileshare/runtime/globals.hpp
ShareVtableStubsJDK6boolaarch64truedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
ShareVtableStubsJDK6boolarmtruedefine_pd_globalcpu/arm/globals_arm.hpp
ShareVtableStubsJDK6boolppctruedefine_pd_globalcpu/ppc/globals_ppc.hpp
ShareVtableStubsJDK6bools390truedefine_pd_globalcpu/s390/globals_s390.hpp
ShareVtableStubsJDK6boolsparcfalsedefine_pd_global// improves performance markedly for mtrt and compresscpu/sparc/globals_sparc.hpp
ShareVtableStubsJDK6boolx86truedefine_pd_globalcpu/x86/globals_x86.hpp
ShareVtableStubsJDK6boolzerotruedefine_pd_globalcpu/zero/globals_zero.hpp
SharedArchiveConfigFileJDK10ccstrNULLproductData to add to the CDS archive fileshare/runtime/globals.hpp
SharedArchiveFileJDK8ccstrNULLdiagnosticOverride the default location of the CDS archive fileshare/runtime/globals.hpp
SharedBaseAddressJDK8size_tLP64_ONLY(32*G)NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0))
range(0, SIZE_MAX)
productAddress to allocate shared memory region for class datashare/runtime/globals.hpp
SharedClassListFileJDK8ccstrNULLproductOverride the default CDS class listshare/runtime/globals.hpp
SharedSymbolTableBucketSizeJDK9uintx4
range(2, 246)
productAverage number of symbols per bucket in shared tableshare/runtime/globals.hpp
ShowHiddenFramesJDK8boolfalsediagnosticshow method handle implementation frames (usually hidden)share/runtime/globals.hpp
ShowMessageBoxOnErrorJDK6boolfalseproductKeep process alive on VM fatal errorshare/runtime/globals.hpp
ShowSafepointMsgsJDK6boolfalsedevelopShow message about safepoint synchronizationshare/runtime/globals.hpp
ShrinkHeapInStepsJDK9booltrueproductWhen disabled, informs the GC to shrink the java heap directly to the target size at the next full GC rather than requiring smaller steps during multiple full GCs.share/runtime/globals.hpp
SoftMatchFailureJDK6booltrueInProductdevelopIf the DFA fails to match a node, print a message and bail outshare/opto/c2_globals.hpp
SoftRefLRUPolicyMSPerMBJDK6intx1000
range(0, max_intx)
productNumber of milliseconds per MB of free space in the heapshare/runtime/globals.hpp
SoftwarePrefetchHintDistanceJDK10intaarch64-1
range(-1, 32760)
productUse prfm hint with specified distance in compiled code.Value -1 means off.cpu/aarch64/globals_aarch64.hpp
SparcV9RegsHiBitsZeroJDK6booltruedevelopAssume Sparc V9 I&L registers on V8+ systems are zero-extendedshare/opto/c2_globals.hpp
SpecTrapLimitExtraEntriesJDK8intx3experimentalExtra method data trap entries for speculationshare/runtime/globals.hpp
SpecialArraysEqualsJDK6booltruediagnosticspecial version of Arrays.equals(char[],char[])share/opto/c2_globals.hpp
SpecialEncodeISOArrayJDK8booltruediagnosticspecial version of ISO_8859_1$Encoder.encodeISOArrayshare/opto/c2_globals.hpp
SpecialStringCompareToJDK6booltruediagnosticspecial version of string compareToshare/opto/c2_globals.hpp
SpecialStringEqualsJDK6booltruediagnosticspecial version of string equalsshare/opto/c2_globals.hpp
SpecialStringIndexOfJDK6booltruediagnosticspecial version of string indexOfshare/opto/c2_globals.hpp
SplitIfBlocksJDK6booltrueproductClone compares and control flow through merge points to fold some branchesshare/opto/c2_globals.hpp
StackPrintLimitJDK6intx100developnumber of stack frames to print in VM-level stack dumpshare/runtime/globals.hpp
StackRedPagesJDK6intxaarch64DEFAULT_STACK_RED_PAGESdefine_pd_globalcpu/aarch64/globals_aarch64.hpp
StackRedPagesJDK6intxarmDEFAULT_STACK_RED_PAGESdefine_pd_globalcpu/arm/globals_arm.hpp
StackRedPagesJDK6intxnull
range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))
product_pdNumber of red zone (unrecoverable overflows) pages of size 4KB. If pages are bigger red zone is aligned up.share/runtime/globals.hpp
StackRedPagesJDK6intxppcDEFAULT_STACK_RED_PAGESdefine_pd_globalcpu/ppc/globals_ppc.hpp
StackRedPagesJDK6intxs390DEFAULT_STACK_RED_PAGESdefine_pd_globalcpu/s390/globals_s390.hpp
StackRedPagesJDK6intxsparcDEFAULT_STACK_RED_PAGESdefine_pd_globalcpu/sparc/globals_sparc.hpp
StackRedPagesJDK6intxx86DEFAULT_STACK_RED_PAGESdefine_pd_globalcpu/x86/globals_x86.hpp
StackRedPagesJDK6intxzeroDEFAULT_STACK_RED_PAGESdefine_pd_globalcpu/zero/globals_zero.hpp
StackReservedPagesJDK9intxaarch64DEFAULT_STACK_RESERVED_PAGESdefine_pd_globalcpu/aarch64/globals_aarch64.hpp
StackReservedPagesJDK9intxarmDEFAULT_STACK_RESERVED_PAGESdefine_pd_globalcpu/arm/globals_arm.hpp
StackReservedPagesJDK9intxnull
range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))
product_pdNumber of reserved zone (reserved to annotated methods) pages of size 4KB. If pages are bigger reserved zone is aligned up.share/runtime/globals.hpp
StackReservedPagesJDK9intxppcDEFAULT_STACK_RESERVED_PAGESdefine_pd_globalcpu/ppc/globals_ppc.hpp
StackReservedPagesJDK9intxs390DEFAULT_STACK_RESERVED_PAGESdefine_pd_globalcpu/s390/globals_s390.hpp
StackReservedPagesJDK9intxsparcDEFAULT_STACK_RESERVED_PAGESdefine_pd_globalcpu/sparc/globals_sparc.hpp
StackReservedPagesJDK9intxx86DEFAULT_STACK_RESERVED_PAGESdefine_pd_globalcpu/x86/globals_x86.hpp
StackReservedPagesJDK9intxzeroDEFAULT_STACK_RESERVED_PAGESdefine_pd_globalcpu/zero/globals_zero.hpp
StackShadowPagesJDK6intxaarch64DEFAULT_STACK_SHADOW_PAGESdefine_pd_globalcpu/aarch64/globals_aarch64.hpp
StackShadowPagesJDK6intxarmDEFAULT_STACK_SHADOW_PAGESdefine_pd_globalcpu/arm/globals_arm.hpp
StackShadowPagesJDK6intxnull
range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))
product_pdNumber of shadow zone (for overflow checking) pages of size 4KB. If pages are bigger shadow zone is aligned up. This should exceed the depth of the VM and native call stack.share/runtime/globals.hpp
StackShadowPagesJDK6intxppcDEFAULT_STACK_SHADOW_PAGESdefine_pd_globalcpu/ppc/globals_ppc.hpp
StackShadowPagesJDK6intxs390DEFAULT_STACK_SHADOW_PAGESdefine_pd_globalcpu/s390/globals_s390.hpp
StackShadowPagesJDK6intxsparcDEFAULT_STACK_SHADOW_PAGESdefine_pd_globalcpu/sparc/globals_sparc.hpp
StackShadowPagesJDK6intxx86DEFAULT_STACK_SHADOW_PAGESdefine_pd_globalcpu/x86/globals_x86.hpp
StackShadowPagesJDK6intxzeroDEFAULT_STACK_SHADOW_PAGESdefine_pd_globalcpu/zero/globals_zero.hpp
StackTraceInThrowableJDK6booltrueproductCollect backtrace in throwable when exception happensshare/runtime/globals.hpp
StackYellowPagesJDK6intxaarch64DEFAULT_STACK_YELLOW_PAGESdefine_pd_globalcpu/aarch64/globals_aarch64.hpp
StackYellowPagesJDK6intxarmDEFAULT_STACK_YELLOW_PAGESdefine_pd_globalcpu/arm/globals_arm.hpp
StackYellowPagesJDK6intxnull
range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))
product_pdNumber of yellow zone (recoverable overflows) pages of size 4KB. If pages are bigger yellow zone is aligned up.share/runtime/globals.hpp
StackYellowPagesJDK6intxppcDEFAULT_STACK_YELLOW_PAGESdefine_pd_globalcpu/ppc/globals_ppc.hpp
StackYellowPagesJDK6intxs390DEFAULT_STACK_YELLOW_PAGESdefine_pd_globalcpu/s390/globals_s390.hpp
StackYellowPagesJDK6intxsparcDEFAULT_STACK_YELLOW_PAGESdefine_pd_globalcpu/sparc/globals_sparc.hpp
StackYellowPagesJDK6intxx86DEFAULT_STACK_YELLOW_PAGESdefine_pd_globalcpu/x86/globals_x86.hpp
StackYellowPagesJDK6intxzeroDEFAULT_STACK_YELLOW_PAGESdefine_pd_globalcpu/zero/globals_zero.hpp
StartAggressiveSweepingAtJDK9uintx10
range(0, 100)
productStart aggressive sweeping if X[%] of the code cache is free.Segmented code cache: X[%] of the non-profiled heap.Non-segmented code cache: X[%] of the total code cacheshare/runtime/globals.hpp
StartAttachListenerJDK6boolfalseproductAlways start Attach Listener at VM startupshare/runtime/globals.hpp
StopInterpreterAtJDK6intx0developStop interpreter execution at specified bytecode numbershare/runtime/globals.hpp
StressArrayCopyMacroNodeJDK9boolfalsedevelopPerform ArrayCopy load/store replacement during IGVN onlyshare/opto/c2_globals.hpp
StressCodeAgingJDK9boolfalsediagnosticStart with counters compiled inshare/runtime/globals.hpp
StressCodeBuffersJDK6boolfalsedevelopExercise code buffer expansion and other rare state changesshare/runtime/globals.hpp
StressCompiledExceptionHandlersJDK8boolfalsedevelopExercise compiled exception handlersshare/runtime/globals.hpp
StressCriticalJNINativesJDK6boolfalsenotproductExercise register saving code in critical nativesshare/runtime/globals.hpp
StressDerivedPointersJDK6boolfalsenotproductForce scavenge when a derived pointer is detected on stack after rtm callshare/runtime/globals.hpp
StressGCMJDK8boolfalsediagnosticRandomize instruction scheduling in GCMshare/opto/c2_globals.hpp
StressLCMJDK8boolfalsediagnosticRandomize instruction scheduling in LCMshare/opto/c2_globals.hpp
StressLdcRewriteJDK6boolfalseproductForce ldc -> ldc_w rewrite during RedefineClassesshare/runtime/globals.hpp
StressLinearScanJDK6boolfalsedevelopscramble block order used by LinearScan (stress test)share/c1/c1_globals.hpp
StressLoopInvariantCodeMotionJDK8boolfalsedevelopstress loop invariant code motionshare/c1/c1_globals.hpp
StressRangeCheckEliminationJDK8boolfalsedevelopstress Range Check Eliminationshare/c1/c1_globals.hpp
StressRecompilationJDK6boolfalsedevelopRecompile each compiled method without subsuming loads or escape analysis.share/opto/c2_globals.hpp
StressReflectiveCodeJDK6boolfalsedevelopUse inexact types at allocations, etc., to test reflectionshare/opto/c2_globals.hpp
StressRewriterJDK8boolfalsedevelopStress linktime bytecode rewritingshare/runtime/globals.hpp
StrictSafepointChecksJDK6booltrueInDebugnotproductEnable strict checks that safepoints cannot happen for threads that use NoSafepointVerifiershare/runtime/globals.hpp
StringDeduplicationAgeThresholdJDK8uintx3
range(1, markOopDesc::max_age)
productA string must reach this age (or be promoted to an old region) to be considered for deduplicationshare/runtime/globals.hpp
StringDeduplicationRehashALotJDK8boolfalsediagnosticForce table rehash every time the table is scannedshare/runtime/globals.hpp
StringDeduplicationResizeALotJDK8boolfalsediagnosticForce table resize every time the table is scannedshare/runtime/globals.hpp
StringTableSizeJDK6uintxdefaultStringTableSize
range(minimumStringTableSize, 111*defaultStringTableSize)
productNumber of buckets in the interned String tableshare/runtime/globals.hpp
SubsumeLoadsJDK6booltruedevelopAttempt to compile while subsuming loads into machine instructions.share/opto/c2_globals.hpp
SuperWordLoopUnrollAnalysisJDK9boolaarch64truedefine_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
SuperWordLoopUnrollAnalysisJDK9boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
SuperWordLoopUnrollAnalysisJDK9boolnullproduct_pdMap number of unrolls for main loop via Superword Level Parallelism analysisshare/opto/c2_globals.hpp
SuperWordLoopUnrollAnalysisJDK9boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
SuperWordLoopUnrollAnalysisJDK9bools390falsedefine_pd_globalcpu/s390/c2_globals_s390.hpp
SuperWordLoopUnrollAnalysisJDK9boolsparcfalsedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
SuperWordLoopUnrollAnalysisJDK9boolx86truedefine_pd_globalcpu/x86/c2_globals_x86.hpp
SuperWordRTDepCheckJDK6boolfalsedevelopEnable runtime dependency checks.share/opto/c2_globals.hpp
SuperWordReductionsJDK9booltrueproductEnable reductions support in superword.share/opto/c2_globals.hpp
SuperwordUseVSXJDK10boolppcfalseproductUse Power8 VSX instructions for superword optimization.cpu/ppc/globals_ppc.hpp
SuppressErrorAtJDK6ccstrlistList of assertions (file:line) to muzzlenotproductshare/runtime/globals.hpp
SuppressFatalErrorMessageJDK6boolfalseproductReport NO fatal error message (avoid deadlock)share/runtime/globals.hpp
SurvivorAlignmentInBytesJDK8intx0experimentalDefault survivor space alignment in bytesshare/runtime/globals.hpp
SurvivorPaddingJDK6uintx3
range(0, max_juint)
productHow much buffer to keep for survivor overflowshare/runtime/globals.hpp
SurvivorRatioJDK6uintx8
range(1, max_uintx-2)
productRatio of eden/survivor space sizeshare/runtime/globals.hpp
SuspendRetryCountJDK6intx50
range(0, max_intx)
productMaximum retry count for an external suspend requestshare/runtime/globals.hpp
SuspendRetryDelayJDK6intx5
range(0, max_intx)
productMilliseconds to delay per retry (* current_retry_count)share/runtime/globals.hpp
SweeperLogEntriesJDK6intx1024notproductNumber of records in the ring buffer of sweeper activityshare/runtime/globals.hpp
SymbolTableSizeJDK8uintxdefaultSymbolTableSize
range(minimumSymbolTableSize, 111*defaultSymbolTableSize)
experimentalNumber of buckets in the JVM internal Symbol tableshare/runtime/globals.hpp
SyncFlagsJDK6intx0experimental(Unsafe, Unstable) Experimental Sync flagsshare/runtime/globals.hpp
SyncKnobsJDK6ccstrNULLexperimental(Unstable) Various monitor synchronization tunablesshare/runtime/globals.hpp
SyncVerboseJDK6intx0experimental(Unstable)share/runtime/globals.hpp
TLABAllocationWeightJDK6uintx35
range(0, 100)
productAllocation averaging weightshare/runtime/globals.hpp
TLABRefillWasteFractionJDK6uintx64
range(1, max_juint)
productMaximum TLAB waste at a refill (internal fragmentation)share/runtime/globals.hpp
TLABSizeJDK6size_t0productStarting TLAB size (in bytes); zero means set ergonomicallyshare/runtime/globals.hpp
TLABStatsJDK6booltrueproductProvide more detailed and expensive TLAB statistics.share/runtime/globals.hpp
TLABWasteIncrementJDK6uintx4
range(0, max_jint)
productIncrement allowed waste at slow allocationshare/runtime/globals.hpp
TLABWasteTargetPercentJDK6uintx1
range(1, 100)
productPercentage of Eden that can be wastedshare/runtime/globals.hpp
TargetPLABWastePctJDK6uintx10
range(1, 100)
productTarget wasted space in last buffer as percent of overall allocationshare/runtime/globals.hpp
TargetSurvivorRatioJDK6uintx50
range(0, 100)
productDesired percentage of survivor space used after scavengeshare/runtime/globals.hpp
TenuredGenerationSizeIncrementJDK6uintx20
range(0, 100)
productAdaptive size percentage change in tenured generationshare/runtime/globals.hpp
TenuredGenerationSizeSupplementDecayJDK6uintx2
range(1, max_uintx)
productDecay factor to TenuredGenerationSizeIncrementshare/runtime/globals.hpp
TenuredGenerationSizeSupplementJDK6uintx80
range(0, 100)
productSupplement to TenuredGenerationSizeIncrement used at startupshare/runtime/globals.hpp
TestCrashInErrorHandlerJDK9uintx0notproductIf > 0, provokes an error inside VM error handler (a secondary crash). see test_error_handler() in vmError.cppshare/runtime/globals.hpp
TestSafeFetchInErrorHandlerJDK9boolfalsenotproductIf true, tests SafeFetch inside error handler.share/runtime/globals.hpp
TestUnresponsiveErrorHandlerJDK10boolfalsenotproductIf true, simulates an unresponsive error handler.share/runtime/globals.hpp
ThreadLocalHandshakesJDK10boolaarch64truedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
ThreadLocalHandshakesJDK10boolarmfalsedefine_pd_globalcpu/arm/globals_arm.hpp
ThreadLocalHandshakesJDK10boolnullproduct_pdUse thread-local polls instead of global poll for safepoints.share/runtime/globals.hpp
ThreadLocalHandshakesJDK10boolppctruedefine_pd_globalcpu/ppc/globals_ppc.hpp
ThreadLocalHandshakesJDK10bools390truedefine_pd_globalcpu/s390/globals_s390.hpp
ThreadLocalHandshakesJDK10boolsparctruedefine_pd_globalcpu/sparc/globals_sparc.hpp
ThreadLocalHandshakesJDK10boolx86falsedefine_pd_globalcpu/x86/globals_x86.hpp
ThreadLocalHandshakesJDK10boolzerofalsedefine_pd_globalcpu/zero/globals_zero.hpp
ThreadPriorityPolicyJDK6intx0
range(0, 1)
product0 : Normal. VM chooses priorities that are appropriate for normal applications. On Solaris NORM_PRIORITY and above are mapped to normal native priority. Java priorities below NORM_PRIORITY map to lower native priority values. On Windows applications are allowed to use higher native priorities. However, with ThreadPriorityPolicy=0, VM will not use the highest possible native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with system threads. On Linux thread priorities are ignoredbecause the OS does not support static priority inSCHED_OTHER scheduling class which is the only choice for non-root, non-realtime applications.1 : Aggressive. Java thread priorities map over to the entire range ofnative thread priorities. Higher Java thread priorities map to higher native thread priorities. This policy should be used with care, as sometimes it can cause performance degradation in the application and/or the entire system. On Linux this policy requires root privilege.share/runtime/globals.hpp
ThreadPriorityVerboseJDK6boolfalseproductPrint priority changesshare/runtime/globals.hpp
ThreadStackSizeJDK6intxaixppc2048define_pd_global// 0 => use system defaultos_cpu/aix_ppc/globals_aix_ppc.hpp
ThreadStackSizeJDK6intxbsdx86320define_pd_globalos_cpu/bsd_x86/globals_bsd_x86.hpp
ThreadStackSizeJDK6intxbsdzero1536define_pd_globalos_cpu/bsd_zero/globals_bsd_zero.hpp
ThreadStackSizeJDK6intxlinuxaarch642048define_pd_global// 0 => use system defaultos_cpu/linux_aarch64/globals_linux_aarch64.hpp
ThreadStackSizeJDK6intxlinuxarm320define_pd_globalos_cpu/linux_arm/globals_linux_arm.hpp
ThreadStackSizeJDK6intxlinuxppc2048define_pd_global// 0 => use system defaultos_cpu/linux_ppc/globals_linux_ppc.hpp
ThreadStackSizeJDK6intxlinuxs3901024define_pd_global// 0 => Use system default.os_cpu/linux_s390/globals_linux_s390.hpp
ThreadStackSizeJDK6intxlinuxx86320define_pd_globalos_cpu/linux_x86/globals_linux_x86.hpp
ThreadStackSizeJDK6intxlinuxzero1536define_pd_globalos_cpu/linux_zero/globals_linux_zero.hpp
ThreadStackSizeJDK6intxnull
range(0, 1 * M)
product_pdThread Stack Size (in Kbytes)share/runtime/globals.hpp
ThreadStackSizeJDK6intxsparc1024define_pd_globalcpu/sparc/globals_sparc.hpp
ThreadStackSizeJDK6intxsolarisx86320define_pd_globalos_cpu/solaris_x86/globals_solaris_x86.hpp
ThreadStackSizeJDK6intxwindowsx860define_pd_global// 0 => use system defaultos_cpu/windows_x86/globals_windows_x86.hpp
ThresholdToleranceJDK6uintx10
range(0, 100)
productAllowed collection cost difference between generationsshare/runtime/globals.hpp
Tier0BackedgeNotifyFreqLogJDK6intx10
range(0, 30)
productInterpreter (tier 0) invocation notification frequencyshare/runtime/globals.hpp
Tier0InvokeNotifyFreqLogJDK6intx7
range(0, 30)
productInterpreter (tier 0) invocation notification frequencyshare/runtime/globals.hpp
Tier0ProfilingStartPercentageJDK6intx200
range(0, max_jint)
productStart profiling in interpreter if the counters exceed tier 3 thresholds by the specified percentageshare/runtime/globals.hpp
Tier23InlineeNotifyFreqLogJDK6intx20
range(0, 30)
productInlinee invocation (tiers 2 and 3) notification frequencyshare/runtime/globals.hpp
Tier2BackEdgeThresholdJDK6intx0
range(0, max_jint)
productBack edge threshold at which tier 2 compilation is invokedshare/runtime/globals.hpp
Tier2BackedgeNotifyFreqLogJDK6intx14
range(0, 30)
productC1 without MDO (tier 2) invocation notification frequencyshare/runtime/globals.hpp
Tier2CompileThresholdJDK6intx0
range(0, max_jint)
productthreshold at which tier 2 compilation is invokedshare/runtime/globals.hpp
Tier2InvokeNotifyFreqLogJDK6intx11
range(0, 30)
productC1 without MDO (tier 2) invocation notification frequencyshare/runtime/globals.hpp
Tier3AOTBackEdgeThresholdJDK9intx120000
range(0, max_jint)
productBack edge threshold at which tier 3 OSR compilation is invoked if coming from AOTshare/runtime/globals.hpp
Tier3AOTCompileThresholdJDK9intx15000
range(0, max_jint)
productThreshold at which tier 3 compilation is invoked (invocation minimum must be satisfied) if coming from AOTshare/runtime/globals.hpp
Tier3AOTInvocationThresholdJDK9intx10000
range(0, max_jint)
productCompile if number of method invocations crosses this threshold if coming from AOTshare/runtime/globals.hpp
Tier3AOTMinInvocationThresholdJDK9intx1000
range(0, max_jint)
productMinimum invocation to compile at tier 3 if coming from AOTshare/runtime/globals.hpp
Tier3BackEdgeThresholdJDK6intx60000
range(0, max_jint)
productBack edge threshold at which tier 3 OSR compilation is invokedshare/runtime/globals.hpp
Tier3BackedgeNotifyFreqLogJDK6intx13
range(0, 30)
productC1 with MDO profiling (tier 3) invocation notification frequencyshare/runtime/globals.hpp
Tier3CompileThresholdJDK6intx2000
range(0, max_jint)
productThreshold at which tier 3 compilation is invoked (invocation minimum must be satisfied)share/runtime/globals.hpp
Tier3DelayOffJDK6intx2
range(0, max_jint)
productIf C2 queue size is less than this amount per compiler thread allow methods compiled at tier 2 transition to tier 3share/runtime/globals.hpp
Tier3DelayOnJDK6intx5
range(0, max_jint)
productIf C2 queue size grows over this amount per compiler thread stop compiling at tier 3 and start compiling at tier 2share/runtime/globals.hpp
Tier3InvocationThresholdJDK6intx200
range(0, max_jint)
productCompile if number of method invocations crosses this thresholdshare/runtime/globals.hpp
Tier3InvokeNotifyFreqLogJDK6intx10
range(0, 30)
productC1 with MDO profiling (tier 3) invocation notification frequencyshare/runtime/globals.hpp
Tier3LoadFeedbackJDK6intx5
range(0, max_jint)
productTier 3 thresholds will increase twofold when C1 queue size reaches this amount per compiler threadshare/runtime/globals.hpp
Tier3MinInvocationThresholdJDK6intx100
range(0, max_jint)
productMinimum invocation to compile at tier 3share/runtime/globals.hpp
Tier4BackEdgeThresholdJDK6intx40000
range(0, max_jint)
productBack edge threshold at which tier 4 OSR compilation is invokedshare/runtime/globals.hpp
Tier4CompileThresholdJDK6intx15000
range(0, max_jint)
productThreshold at which tier 4 compilation is invoked (invocation minimum must be satisfiedshare/runtime/globals.hpp
Tier4InvocationThresholdJDK6intx5000
range(0, max_jint)
productCompile if number of method invocations crosses this thresholdshare/runtime/globals.hpp
Tier4LoadFeedbackJDK6intx3
range(0, max_jint)
productTier 4 thresholds will increase twofold when C2 queue size reaches this amount per compiler threadshare/runtime/globals.hpp
Tier4MinInvocationThresholdJDK6intx600
range(0, max_jint)
productMinimum invocation to compile at tier 4share/runtime/globals.hpp
TieredCompilationJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
TieredCompilationJDK6boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
TieredCompilationJDK6boolnullproduct_pdEnable tiered compilationshare/runtime/globals.hpp
TieredCompilationJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
TieredCompilationJDK6bools390trueInTiereddefine_pd_globalcpu/s390/c2_globals_s390.hpp
TieredCompilationJDK6boolsparctrueInTiereddefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
TieredCompilationJDK6boolx86falsedefine_pd_globalcpu/x86/c1_globals_x86.hpp
TieredCompileTaskTimeoutJDK6intx50
range(0, max_intx)
productKill compile task if method was not used within given timeout in millisecondsshare/runtime/globals.hpp
TieredRateUpdateMaxTimeJDK6intx25
range(0, max_intx)
productMaximum rate sampling interval (in milliseconds)share/runtime/globals.hpp
TieredRateUpdateMinTimeJDK6intx1
range(0, max_intx)
productMinimum rate sampling interval (in milliseconds)share/runtime/globals.hpp
TieredStopAtLevelJDK6intx4
range(0, 4)
productStop at given compilation levelshare/runtime/globals.hpp
TimeCompilationPolicyJDK6boolfalsedevelopTime the compilation policyshare/runtime/globals.hpp
TimeEachLinearScanJDK6boolfalsedevelopprint detailed timing of each LinearScan runshare/c1/c1_globals.hpp
TimeLinearScanJDK6boolfalseproductdetailed timing of LinearScan phasesshare/c1/c1_globals.hpp
TimeLivenessAnalysisJDK6boolfalsedevelopTime computation of bytecode liveness analysisshare/runtime/globals.hpp
TimeOopMap2JDK6boolfalsedevelopTime calls to GenerateOopMap::compute_map() individuallyshare/runtime/globals.hpp
TimeOopMapJDK6boolfalsedevelopTime calls to GenerateOopMap::compute_map() in sumshare/runtime/globals.hpp
TraceBytecodesAtJDK6intx0developTrace bytecodes starting with specified bytecode numbershare/runtime/globals.hpp
TraceBytecodesJDK6boolfalsedevelopTrace bytecode executionshare/runtime/globals.hpp
TraceCISCSpillJDK6boolfalsenotproductTrace allocators use of cisc spillable instructionsshare/opto/c2_globals.hpp
TraceCallFixupJDK6boolfalsedevelopTrace all call fixupsshare/runtime/globals.hpp
TraceCodeBlobStacksJDK6boolfalsenotproductTrace stack-walk of codeblobsshare/runtime/globals.hpp
TraceCompilationPolicyJDK6boolfalsedevelopTrace compilation policyshare/runtime/globals.hpp
TraceCompiledICJDK6boolfalsedevelopTrace changes of compiled ICshare/runtime/globals.hpp
TraceCreateZombiesJDK6boolfalsedeveloptrace creation of zombie nmethodsshare/runtime/globals.hpp
TraceDeoptimizationJDK6boolfalsedevelopTrace deoptimizationshare/runtime/globals.hpp
TraceDependenciesJDK6boolfalsedevelopTrace dependenciesshare/runtime/globals.hpp
TraceDerivedPointersJDK6boolfalsedevelopTrace traversal of derived pointers on stackshare/runtime/globals.hpp
TraceFPURegisterUsageJDK6boolfalsedevelopTrace usage of FPU registers at start of blocks (intel only)share/c1/c1_globals.hpp
TraceFPUStackJDK6boolfalsedevelopTrace emulation of the FPU stack (intel only)share/c1/c1_globals.hpp
TraceFinalizerRegistrationJDK6boolfalsedevelopTrace registration of final referencesshare/runtime/globals.hpp
TraceFrequencyInliningJDK6boolfalsedevelopTrace frequency based inliningshare/runtime/globals.hpp
TraceGCTaskManagerJDK6boolfalsedevelopTrace actions of the GC task managershare/runtime/globals.hpp
TraceGCTaskQueueJDK6boolfalsedevelopTrace actions of the GC task queuesshare/runtime/globals.hpp
TraceICBufferJDK6boolfalsedevelopTrace usage of IC buffershare/runtime/globals.hpp
TraceICsJDK6boolfalsedevelopTrace inline cache changesshare/runtime/globals.hpp
TraceInlineCacheClearingJDK6boolfalsedevelopTrace clearing of inline caches in nmethodsshare/runtime/globals.hpp
TraceInvocationCounterOverflowJDK6boolfalsenotproductTrace method invocation counter overflowshare/runtime/globals.hpp
TraceInvokeDynamicJDK6boolfalsedeveloptrace internal invoke dynamic operationsshare/runtime/globals.hpp
TraceIterativeGVNJDK6boolfalsedevelopPrint progress during Iterative Global Value Numberingshare/opto/c2_globals.hpp
TraceJVMTIObjectTaggingJDK6boolfalsediagnosticTrace JVMTI object tagging callsshare/runtime/globals.hpp
TraceJVMTIJDK6ccstrNULLproductTrace flags for JVMTI functions and eventsshare/runtime/globals.hpp
TraceJavaAssertionsJDK6boolfalsedevelopTrace java language assertionsshare/runtime/globals.hpp
TraceLinearScanLevelJDK6intx0
range(0, 4)
developDebug levels for the linear scan allocatorshare/c1/c1_globals.hpp
TraceLivenessGenJDK6boolfalsedevelopTrace the generation of liveness analysis informationshare/runtime/globals.hpp
TraceLivenessQueryJDK6boolfalsenotproductTrace queries of liveness analysis informationshare/runtime/globals.hpp
TraceLongCompilesJDK6boolfalsedevelopPrint out every time compilation is longer than a given thresholdshare/runtime/globals.hpp
TraceLoopLimitCheckJDK6boolfalsedevelopTrace generation of loop limits checksshare/opto/c2_globals.hpp
TraceLoopOptsJDK6boolfalsedevelopTrace executed loop optimizationsshare/opto/c2_globals.hpp
TraceLoopPredicateJDK6boolfalsedevelopTrace generation of loop predicatesshare/opto/c2_globals.hpp
TraceLoopUnswitchingJDK6boolfalsenotproductTrace loop unswitchingshare/opto/c2_globals.hpp
TraceMethodHandlesJDK6boolfalsedeveloptrace internal method handle operationsshare/runtime/globals.hpp
TraceMethodReplacementJDK6boolfalsedevelopPrint when methods are replaced do to recompilationshare/runtime/globals.hpp
TraceNMethodInstallsJDK6boolfalsediagnosticTrace nmethod installationshare/runtime/globals.hpp
TraceNewOopMapGenerationDetailedJDK6boolfalsedevelopTrace OopMapGeneration: print detailed cell statesshare/runtime/globals.hpp
TraceNewOopMapGenerationJDK6boolfalsedevelopTrace OopMapGenerationshare/runtime/globals.hpp
TraceNewVectorsJDK8boolfalsenotproductTrace creation of Vector nodesshare/opto/c2_globals.hpp
TraceOnStackReplacementJDK6boolfalsenotproductTrace on stack replacementshare/runtime/globals.hpp
TraceOopMapRewritesJDK6boolfalsedevelopTrace rewriting of method oops during oop map generationshare/runtime/globals.hpp
TraceOptimizeFillJDK6boolfalsedevelopprint detailed information about fill conversionshare/opto/c2_globals.hpp
TraceOptoOutputJDK6boolfalsenotproductTrace pipelining informationshare/opto/c2_globals.hpp
TraceOptoParseJDK6boolfalsedevelopTrace bytecode parse and control-flow mergeshare/opto/c2_globals.hpp
TraceOptoPipeliningJDK6boolfalsenotproductTrace pipelining informationshare/opto/c2_globals.hpp
TraceParallelOldGCDensePrefixJDK6boolfalsedevelopTrace dense prefix computation for ParallelOldGCshare/runtime/globals.hpp
TraceParallelOldGCMarkingPhaseJDK6boolfalsedevelopTrace marking phase in ParallelOldGCshare/runtime/globals.hpp
TracePartialPeelingJDK6boolfalsenotproductTrace partial peeling (loop rotation) informationshare/opto/c2_globals.hpp
TracePatchingJDK6boolfalsedevelopTrace patching of field access on uninitialized classesshare/c1/c1_globals.hpp
TracePcPatchingJDK6boolfalsedevelopTrace usage of frame::patch_pcshare/runtime/globals.hpp
TracePhaseCCPJDK6boolfalsenotproductPrint progress during Conditional Constant Propagationshare/opto/c2_globals.hpp
TracePostallocExpandJDK8boolfalsedevelopTrace expanding nodes after register allocation.share/opto/c2_globals.hpp
TracePredicateFailedTrapsJDK8boolfalsedeveloptrace runtime traps caused by predicate failureshare/c1/c1_globals.hpp
TraceProfileInterpreterJDK8boolfalsedevelopTrace profiling at the bytecode level during interpretation. This outputs the profiling information collected to improve jit compilation.share/runtime/globals.hpp
TraceProfileTripCountJDK6boolfalsenotproductTrace profile loop trip count informationshare/opto/c2_globals.hpp
TraceRangeCheckEliminationJDK8boolfalsedevelopTrace Range Check Eliminationshare/c1/c1_globals.hpp
TraceRangeLimitCheckJDK6boolfalsedevelopTrace additional overflow checks in RCEshare/opto/c2_globals.hpp
TraceRelocatorJDK6boolfalsedevelopTrace the bytecode relocatorshare/runtime/globals.hpp
TraceScavengeJDK6boolfalsenotproductTrace scavengeshare/runtime/globals.hpp
TraceSpillingJDK6boolfalsediagnosticTrace spillingshare/opto/c2_globals.hpp
TraceSuperWordLoopUnrollAnalysisJDK9boolfalsenotproductTrace what Superword Level Parallelism analysis appliesshare/opto/c2_globals.hpp
TraceSuperWordJDK6boolfalsenotproductTrace superword transformsshare/opto/c2_globals.hpp
TraceSuspendWaitFailuresJDK6boolfalseproductTrace external suspend wait failuresshare/runtime/globals.hpp
TraceTrapsJDK8boolaarch64falseproductTrace all traps the signal handlercpu/aarch64/globals_aarch64.hpp
TraceTrapsJDK8boolppcfalseproductTrace all traps the signal handlerhandles.cpu/ppc/globals_ppc.hpp
TraceTrapsJDK8bools390falseproductTrace all traps the signal handlerhandles.cpu/s390/globals_s390.hpp
TraceTypeProfileJDK6boolfalsediagnosticTrace type profileshare/opto/c2_globals.hpp
TraceUncollectedSpeculationsJDK9boolfalsedevelopPrint message when a failed speculation was not collectedshare/jvmci/jvmci_globals.hpp
TrackedInitializationLimitJDK6intx50
range(0, 65535)
productWhen initializing fields, track up to this many wordsshare/opto/c2_globals.hpp
TransmitErrorReportJDK6boolfalseproductEnable error report transmission on erroneous terminationshare/runtime/globals.hpp
TrapBasedICMissChecksJDK8boolppctrueproductRaise and handle SIGTRAP if inline cache miss detected.cpu/ppc/globals_ppc.hpp
TrapBasedNotEntrantChecksJDK8boolppctrueproductRaise and handle SIGTRAP if calling not entrant or zombie method.cpu/ppc/globals_ppc.hpp
TrapBasedNullChecksJDK8boolaarch64falsedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
TrapBasedNullChecksJDK8boolarmfalsedefine_pd_global// Not neededcpu/arm/globals_arm.hpp
TrapBasedNullChecksJDK8boolnullproduct_pdGenerate code for null checks that uses a cmp and trap instruction raising SIGTRAP.This is only used if an access tonull (+offset) will not raise a SIGSEGV, i.e.,ImplicitNullChecks don't work (PPC64).share/runtime/globals.hpp
TrapBasedNullChecksJDK8boolppctruedefine_pd_globalcpu/ppc/globals_ppc.hpp
TrapBasedNullChecksJDK8bools390truedefine_pd_globalcpu/s390/globals_s390.hpp
TrapBasedNullChecksJDK8boolsparcfalsedefine_pd_global// Not needed on sparc.cpu/sparc/globals_sparc.hpp
TrapBasedNullChecksJDK8boolx86falsedefine_pd_global// Not needed on x86.cpu/x86/globals_x86.hpp
TrapBasedNullChecksJDK8boolzerofalsedefine_pd_globalcpu/zero/globals_zero.hpp
TrapBasedRangeChecksJDK8boolaarch64falsedefine_pd_global// Not needed.cpu/aarch64/c2_globals_aarch64.hpp
TrapBasedRangeChecksJDK8boolarmfalsedefine_pd_global// Not neededcpu/arm/c2_globals_arm.hpp
TrapBasedRangeChecksJDK8boolnullproduct_pdGenerate code for range checks that uses a cmp and trap instruction raising SIGTRAP. Used on PPC64.share/opto/c2_globals.hpp
TrapBasedRangeChecksJDK8boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
TrapBasedRangeChecksJDK8bools390falsedefine_pd_global// Not needed on z/Architecture.cpu/s390/c2_globals_s390.hpp
TrapBasedRangeChecksJDK8boolsparcfalsedefine_pd_global// Not needed on sparc.cpu/sparc/c2_globals_sparc.hpp
TrapBasedRangeChecksJDK8boolx86falsedefine_pd_global// Not needed on x86.cpu/x86/c2_globals_x86.hpp
TrustFinalNonStaticFieldsJDK6boolfalseexperimentaltrust final non-static declarations for constant foldingshare/runtime/globals.hpp
TwoOperandLIRFormJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
TwoOperandLIRFormJDK6boolarmfalsedefine_pd_globalcpu/arm/c1_globals_arm.hpp
TwoOperandLIRFormJDK6boolppcfalsedefine_pd_globalcpu/ppc/c1_globals_ppc.hpp
TwoOperandLIRFormJDK6bools390truedefine_pd_globalcpu/s390/c1_globals_s390.hpp
TwoOperandLIRFormJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c1_globals_sparc.hpp
TwoOperandLIRFormJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
TypeProfileArgsLimitJDK8intx2
range(0, 16)
productmax number of call arguments to consider for type profilingshare/runtime/globals.hpp
TypeProfileCastsJDK6booltruedeveloptreat casts like calls for purposes of type profilingshare/runtime/globals.hpp
TypeProfileLevelJDK8uintxaarch64111define_pd_globalcpu/aarch64/globals_aarch64.hpp
TypeProfileLevelJDK8uintxarm0define_pd_globalcpu/arm/globals_arm.hpp
TypeProfileLevelJDK8uintxnullproduct_pd=XYZ, with Z: Type profiling of arguments at call; Y: Type profiling of return value at call; X: Type profiling of parameters to methods; X, Y and Z in 0=off ; 1=jsr292 only; 2=all methodsshare/runtime/globals.hpp
TypeProfileLevelJDK8uintxppc111define_pd_globalcpu/ppc/globals_ppc.hpp
TypeProfileLevelJDK8uintxs390111define_pd_globalcpu/s390/globals_s390.hpp
TypeProfileLevelJDK8uintxsparc111define_pd_globalcpu/sparc/globals_sparc.hpp
TypeProfileLevelJDK8uintxx86111define_pd_globalcpu/x86/globals_x86.hpp
TypeProfileLevelJDK8uintxzero0define_pd_globalcpu/zero/globals_zero.hpp
TypeProfileMajorReceiverPercentJDK6intx90
range(0, 100)
product% of major receiver type to all profiled receiversshare/opto/c2_globals.hpp
TypeProfileParmsLimitJDK8intx2
range(-1, 64)
productmax number of incoming parameters to consider for type profiling, -1 for allshare/runtime/globals.hpp
TypeProfileWidthJDK6intx2
range(0, 8)
productNumber of receiver types to record in call/cast profileshare/runtime/globals.hpp
UncommonNullCastJDK6boolaarch64truedefine_pd_global// Uncommon-trap NULLs past to check castcpu/aarch64/globals_aarch64.hpp
UncommonNullCastJDK6boolarmtruedefine_pd_global// Uncommon-trap NULLs past to check castcpu/arm/globals_arm.hpp
UncommonNullCastJDK6boolppctruedefine_pd_global// Uncommon-trap NULLs passed to check cast.cpu/ppc/globals_ppc.hpp
UncommonNullCastJDK6bools390truedefine_pd_global// Uncommon-trap NULLs passed to check cast.cpu/s390/globals_s390.hpp
UncommonNullCastJDK6boolsparctruedefine_pd_global// Uncommon-trap NULLs passed to check castcpu/sparc/globals_sparc.hpp
UncommonNullCastJDK6boolx86truedefine_pd_global// Uncommon-trap NULLs passed to check castcpu/x86/globals_x86.hpp
UncommonNullCastJDK6boolzerotruedefine_pd_globalcpu/zero/globals_zero.hpp
UnguardOnExecutionViolationJDK6intx0
range(0, 2)
productUnguard page and retry on no-execute fault (Win32 only) 0=off, 1=conservative, 2=aggressiveshare/runtime/globals.hpp
UnlinkSymbolsALotJDK6boolfalseproductUnlink unreferenced symbols from the symbol table at safepointsshare/runtime/globals.hpp
UnlockDiagnosticVMOptionsJDK6booltrueInDebugdiagnosticEnable normal processing of flags relating to field diagnosticsshare/runtime/globals.hpp
UnlockExperimentalVMOptionsJDK6boolfalseexperimentalEnable normal processing of flags relating to experimental featuresshare/runtime/globals.hpp
UnrollLimitForProfileCheckJDK6intx1
range(0, max_intx)
developDon't use profile_trip_cnt() to restrict unrolling until unrolling would push the number of unrolled iterations above UnrollLimitForProfileCheck. A higher value allows more unrolling. Zero acts as a very large value.share/opto/c2_globals.hpp
UnsyncloadClassJDK6boolfalsediagnosticUnstable: VM calls loadClass unsynchronized. Custom class loader must call VM synchronized for findClass and defineClass.share/runtime/globals.hpp
Use24BitFPModeJDK6booltruedevelopSet 24-bit FPU mode on a per-compile basisshare/opto/c2_globals.hpp
Use24BitFPJDK6booltruedevelopuse FP instructions that produce 24-bit precise resultsshare/opto/c2_globals.hpp
Use64KPagesThresholdJDK9uintxaix0develop4K/64K page allocation threshold.os/aix/globals_aix.hpp
Use64KPagesJDK9boolaixtrueproductUse 64K pages if available.os/aix/globals_aix.hpp
UseAESCTRIntrinsicsJDK9boolfalsediagnosticUse intrinsics for the paralleled version of AES/CTR cryptoshare/runtime/globals.hpp
UseAESIntrinsicsJDK8boolfalsediagnosticUse intrinsics for AES versions of cryptoshare/runtime/globals.hpp
UseAESJDK8boolfalseproductControl whether AES instructions are used when availableshare/runtime/globals.hpp
UseAOTStrictLoadingJDK9boolfalsediagnosticExit the VM if any of the AOT libraries has invalid configshare/runtime/globals.hpp
UseAOTJDK9boolAOT_ONLY(true) NOT_AOT(false)productUse AOT compiled filesshare/runtime/globals.hpp
UseAVXJDK6intxx863
range(0, 99)
productHighest supported AVX instructions set on x86/x64cpu/x86/globals_x86.hpp
UseAdaptiveGCBoundaryJDK6boolfalseproductAllow young-old boundary to moveshare/runtime/globals.hpp
UseAdaptiveGenerationSizePolicyAtMajorCollectionJDK6booltrueproductUse adaptive young-old sizing policies at major collectionsshare/runtime/globals.hpp
UseAdaptiveGenerationSizePolicyAtMinorCollectionJDK6booltrueproductUse adaptive young-old sizing policies at minor collectionsshare/runtime/globals.hpp
UseAdaptiveNUMAChunkSizingJDK6booltrueproductEnable adaptive chunk sizing for NUMAshare/runtime/globals.hpp
UseAdaptiveSizeDecayMajorGCCostJDK6booltrueproductAdaptive size decays the major cost for long major intervalsshare/runtime/globals.hpp
UseAdaptiveSizePolicyFootprintGoalJDK6booltrueproductUse adaptive minimum footprint as a goalshare/runtime/globals.hpp
UseAdaptiveSizePolicyWithSystemGCJDK6boolfalseproductInclude statistics from System.gc() for adaptive size policyshare/runtime/globals.hpp
UseAdaptiveSizePolicyJDK6booltrueproductUse adaptive generation sizing policiesshare/runtime/globals.hpp
UseAddressNopJDK6boolx86falseproductUse '0F 1F [addr]' NOP instructions on x86 cpuscpu/x86/globals_x86.hpp
UseAdler32IntrinsicsJDK9boolfalsediagnosticuse intrinsics for java.util.zip.Adler32share/runtime/globals.hpp
UseAppCDSJDK10boolfalseproductEnable Application Class Data Sharing when using shared spacesshare/runtime/globals.hpp
UseBMI1InstructionsJDK8boolx86falseproductUse BMI1 instructionscpu/x86/globals_x86.hpp
UseBMI2InstructionsJDK8boolx86falseproductUse BMI2 instructionscpu/x86/globals_x86.hpp
UseBarriersForVolatileJDK9boolaarch64falseproductUse memory barriers to implement volatile accessescpu/aarch64/globals_aarch64.hpp
UseBiasedLockingJDK6booltrueproductEnable biased locking in JVMshare/runtime/globals.hpp
UseBimorphicInliningJDK6booltrueproductProfiling based inlining for two receiversshare/opto/c2_globals.hpp
UseBlockCopyJDK6boolsparcfalseproductUse special cpu instructions for block copycpu/sparc/globals_sparc.hpp
UseBlockZeroingJDK6boolaarch64trueproductUse DC ZVA for block zeroingcpu/aarch64/globals_aarch64.hpp
UseBlockZeroingJDK6boolsparcfalseproductUse special cpu instructions for block zeroingcpu/sparc/globals_sparc.hpp
UseBsdPosixThreadCPUClocksJDK6boolbsdtrueproductenable fast Bsd Posix clocks where availableos/bsd/globals_bsd.hpp
UseByteReverseInstructionJDK9bools390trueproductUse byte reverse instruction.cpu/s390/globals_s390.hpp
UseC1OptimizationsJDK6booltruedevelopTurn on C1 optimizationsshare/c1/c1_globals.hpp
UseCASForSwapJDK6boolsparcfalsedevelopDo not use swap instructions, but only CAS (in a loop) on SPARCcpu/sparc/globals_sparc.hpp
UseCBCondJDK6boolsparcfalseproductUse compare and branch instruction on SPARCcpu/sparc/globals_sparc.hpp
UseCGroupMemoryLimitForHeapJDK8boolfalseexperimentalUse CGroup memory limit as physical memory limit for heap sizingDeprecated, replaced by container supportshare/runtime/globals.hpp
UseCHAJDK6booltruedevelopEnable CHAshare/runtime/globals.hpp
UseCISCSpillJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c2_globals_aarch64.hpp
UseCISCSpillJDK6boolarmfalsedefine_pd_globalcpu/arm/c2_globals_arm.hpp
UseCISCSpillJDK6boolppcfalsedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
UseCISCSpillJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
UseCISCSpillJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
UseCISCSpillJDK6boolx86truedefine_pd_globalcpu/x86/c2_globals_x86.hpp
UseCLMULJDK8boolx86falseproductControl whether CLMUL instructions can be used on x86/x64cpu/x86/globals_x86.hpp
UseCMSBestFitJDK6booltrueproductUse CMS best fit allocation strategyshare/runtime/globals.hpp
UseCMSInitiatingOccupancyOnlyJDK6boolfalseproductOnly use occupancy as a criterion for starting a CMS collectionshare/runtime/globals.hpp
UseCMoveUnconditionallyJDK9boolfalseproductUse CMove (scalar and vector) ignoring profitability test.share/opto/c2_globals.hpp
UseCRC32CIntrinsicsJDK9boolfalsediagnosticuse intrinsics for java.util.zip.CRC32Cshare/runtime/globals.hpp
UseCRC32IntrinsicsJDK8boolfalsediagnosticuse intrinsics for java.util.zip.CRC32share/runtime/globals.hpp
UseCRC32JDK9boolaarch64falseproductUse CRC32 instructions for CRC32 computationcpu/aarch64/globals_aarch64.hpp
UseCodeAgingJDK9booltrueproductInsert counter to detect warm methodsshare/runtime/globals.hpp
UseCodeCacheFlushingJDK6booltrueproductRemove cold/old nmethods from the code cacheshare/runtime/globals.hpp
UseCompilerJDK6booltrueproductUse Just-In-Time compilationshare/runtime/globals.hpp
UseCompressedClassPointersJDK8boolfalselp64_productUse 32-bit class pointers in 64-bit VM. lp64_product means flag is always constant in 32 bit VMshare/runtime/globals.hpp
UseCompressedOopsJDK6boolfalselp64_productUse 32-bit object references in 64-bit VM. lp64_product means flag is always constant in 32 bit VMshare/runtime/globals.hpp
UseConcMarkSweepGCJDK6boolfalseproductUse Concurrent Mark-Sweep GC in the old generationshare/runtime/globals.hpp
UseCondCardMarkJDK6boolfalseproductCheck for already marked card before updating card tableshare/runtime/globals.hpp
UseContainerSupportJDK10boollinuxtrueproductEnable detection and runtime container configuration supportos/linux/globals_linux.hpp
UseCountLeadingZerosInstructionJDK6boolx86falseproductUse count leading zeros instructioncpu/x86/globals_x86.hpp
UseCountLeadingZerosInstructionsPPC64JDK8boolppctrueproductUse count leading zeros instructions.cpu/ppc/globals_ppc.hpp
UseCountTrailingZerosInstructionJDK8boolx86falseproductUse count trailing zeros instructioncpu/x86/globals_x86.hpp
UseCountedLoopSafepointsJDK8boolfalseproductForce counted loops to keep a safepointshare/opto/c2_globals.hpp
UseCounterDecayJDK6booltrueproductAdjust recompilation countersshare/runtime/globals.hpp
UseCpuAllocPathJDK9boollinuxfalsediagnosticUse CPU_ALLOC code path in os::active_processor_countos/linux/globals_linux.hpp
UseCriticalCMSThreadPriorityJDK6boolfalseexperimentalConcurrentMarkSweep thread runs at critical scheduling priorityshare/runtime/globals.hpp
UseCriticalCompilerThreadPriorityJDK6boolfalseexperimentalCompiler thread(s) run at critical scheduling priorityshare/runtime/globals.hpp
UseCriticalJavaThreadPriorityJDK6boolfalseexperimentalJava thread priority 10 maps to critical scheduling priorityshare/runtime/globals.hpp
UseDetachedThreadsJDK6booltruedevelopUse detached threads that are recycled upon termination (for Solaris only)share/runtime/globals.hpp
UseDivModJDK6booltrueproductUse combined DivMod instruction if availableshare/opto/c2_globals.hpp
UseDynamicNumberOfGCThreadsJDK6boolfalseproductDynamically choose the number of parallel threads parallel gc will useshare/runtime/globals.hpp
UseExactTypesJDK6booltruedevelopUse exact types to eliminate array store checks and v-callsshare/opto/c2_globals.hpp
UseExplicitCommitJDK9boolaixfalseproductExplicit commit for virtual memory.os/aix/globals_aix.hpp
UseExtendedFileIOJDK6boolsolaristrueproductEnable workaround for limitations of stdio FILE structureos/solaris/globals_solaris.hpp
UseExtendedLoadAndReserveInstructionsPPC64JDK8boolppcfalseproductUse extended versions of load-and-reserve instructions.cpu/ppc/globals_ppc.hpp
UseFMAJDK9boolfalseproductControl whether FMA instructions are used when availableshare/runtime/globals.hpp
UseFPUForSpillingJDK6boolfalseproductSpill integer registers to FPU instead of stack when possibleshare/opto/c2_globals.hpp
UseFakeTimersJDK6boolfalsedevelopTell whether the VM should use system time or a fake timershare/runtime/globals.hpp
UseFastAccessorMethodsJDK6boolzerotrueproductUse fast method entry code for accessor methodscpu/zero/globals_zero.hpp
UseFastEmptyMethodsJDK6boolzerotrueproductUse fast method entry code for empty methodscpu/zero/globals_zero.hpp
UseFastJNIAccessorsJDK6booltrueproductUse optimized versions of GetFieldshare/runtime/globals.hpp
UseFastLockingJDK6booltruedevelopUse fast inlined locking codeshare/c1/c1_globals.hpp
UseFastNewInstanceJDK6booltruedevelopUse fast inlined instance allocationshare/c1/c1_globals.hpp
UseFastNewObjectArrayJDK6booltruedevelopUse fast inlined object array allocationshare/c1/c1_globals.hpp
UseFastNewTypeArrayJDK6booltruedevelopUse fast inlined type array allocationshare/c1/c1_globals.hpp
UseFastSignatureHandlersJDK6booltruedevelopUse fast signature handlers for native callsshare/runtime/globals.hpp
UseFastStosbJDK8boolx86falseproductUse fast-string operation for zeroing: rep stosbcpu/x86/globals_x86.hpp
UseG1GCJDK6boolfalseproductUse the Garbage-First garbage collectorshare/runtime/globals.hpp
UseGCOverheadLimitJDK6booltrueproductUse policy to limit of proportion of time spent in GC before an OutOfMemory error is thrownshare/runtime/globals.hpp
UseGCTaskAffinityJDK6boolfalseproductUse worker affinity when asking for GCTasksshare/runtime/globals.hpp
UseGHASHIntrinsicsJDK9boolfalsediagnosticUse intrinsics for GHASH versions of cryptoshare/runtime/globals.hpp
UseGlobalValueNumberingJDK6booltruedevelopUse Global Value Numbering (separate phase)share/c1/c1_globals.hpp
UseHeavyMonitorsJDK6boolfalseproductuse heavyweight instead of lightweight Java monitorsshare/runtime/globals.hpp
UseHugeTLBFSJDK6boolbsdfalseproductUse MAP_HUGETLB for large pagesos/bsd/globals_bsd.hpp
UseHugeTLBFSJDK6boollinuxfalseproductUse MAP_HUGETLB for large pagesos/linux/globals_linux.hpp
UseImplicitStableValuesJDK8booltruediagnosticMark well-known stable fields as such (e.g. String.value)share/opto/c2_globals.hpp
UseIncDecJDK6boolx86truediagnosticUse INC, DEC instructions on x86cpu/x86/globals_x86.hpp
UseInlineCachesJDK6booltrueproductUse Inline Caches for virtual callsshare/runtime/globals.hpp
UseInlineDepthForSpeculativeTypesJDK8booltruediagnosticCarry inline depth of profile point with speculative type and give priority to profiling from lower inline depthshare/opto/c2_globals.hpp
UseInterpreterJDK6booltrueproductUse interpreter for non-compiled methodsshare/runtime/globals.hpp
UseJVMCICompilerJDK9boolfalseexperimentalUse JVMCI as the default compilershare/jvmci/jvmci_globals.hpp
UseJumpTablesJDK6booltrueproductUse JumpTables instead of a binary search tree for switchesshare/opto/c2_globals.hpp
UseLSEJDK9boolaarch64falseproductUse LSE instructionscpu/aarch64/globals_aarch64.hpp
UseLWPSynchronizationJDK6booltrueproductUse LWP-based instead of libthread-based synchronization (SPARC only)share/runtime/globals.hpp
UseLargePagesInMetaspaceJDK8boolfalseproductUse large page memory in metaspace. Only used if UseLargePages is enabled.share/runtime/globals.hpp
UseLargePagesIndividualAllocationJDK6boolaixfalsedefine_pd_globalos/aix/globals_aix.hpp
UseLargePagesIndividualAllocationJDK6boolbsdfalsedefine_pd_globalos/bsd/globals_bsd.hpp
UseLargePagesIndividualAllocationJDK6boollinuxfalsedefine_pd_globalos/linux/globals_linux.hpp
UseLargePagesIndividualAllocationJDK6boolnullproduct_pdAllocate large pages individually for better affinityshare/runtime/globals.hpp
UseLargePagesIndividualAllocationJDK6boolsolarisfalsedefine_pd_globalos/solaris/globals_solaris.hpp
UseLargePagesIndividualAllocationJDK6boolwindowstruedefine_pd_globalos/windows/globals_windows.hpp
UseLargePagesJDK6boolaixfalsedefine_pd_globalos/aix/globals_aix.hpp
UseLargePagesJDK6boolbsdfalsedefine_pd_globalos/bsd/globals_bsd.hpp
UseLargePagesJDK6boollinuxfalsedefine_pd_globalos/linux/globals_linux.hpp
UseLargePagesJDK6boolnullproduct_pdUse large page memoryshare/runtime/globals.hpp
UseLargePagesJDK6boolsolaristruedefine_pd_globalos/solaris/globals_solaris.hpp
UseLargePagesJDK6boolwindowsfalsedefine_pd_globalos/windows/globals_windows.hpp
UseLibmIntrinsicJDK9boolx86truediagnosticUse Libm Intrinsicscpu/x86/globals_x86.hpp
UseLinuxPosixThreadCPUClocksJDK6boollinuxtrueproductenable fast Linux Posix clocks where availableos/linux/globals_linux.hpp
UseLoadInstructionsForStackBangingPPC64JDK8boolppcfalseproductUse load instructions for stack banging.cpu/ppc/globals_ppc.hpp
UseLocalValueNumberingJDK6booltruedevelopUse Local Value Numbering (embedded in GraphBuilder)share/c1/c1_globals.hpp
UseLockedTracingJDK8boolfalseproductUse locked-tracing when doing event-based tracingshare/runtime/globals.hpp
UseLoopCounterJDK6booltrueproductIncrement invocation counter on backward branchshare/runtime/globals.hpp
UseLoopInvariantCodeMotionJDK8booltrueproductSimple loop invariant code motion for short loops during GVNshare/c1/c1_globals.hpp
UseLoopPredicateJDK6booltrueproductGenerate a predicate to select fast/slow loop versionsshare/opto/c2_globals.hpp
UseLoopSafepointsJDK6booltruedevelopGenerate Safepoint nodes in every loopshare/runtime/globals.hpp
UseMPMULJDK10boolsparcfalseproductUse multi-precision multiply instruction (mpmul) on SPARCcpu/sparc/globals_sparc.hpp
UseMallocOnlyJDK6boolfalsedevelopUse only malloc/free for allocation (no resource area/arena)share/runtime/globals.hpp
UseMathExactIntrinsicsJDK8booltruediagnosticEnables intrinsification of various java.lang.Math functionsshare/opto/c2_globals.hpp
UseMaximumCompactionOnSystemGCJDK6booltrueproductUse maximum compaction in the Parallel Old garbage collector for a system GCshare/runtime/globals.hpp
UseMembarJDK6boolaarch64truedefine_pd_globalcpu/aarch64/globals_aarch64.hpp
UseMembarJDK6boolarmtruedefine_pd_globalcpu/arm/globals_arm.hpp
UseMembarJDK6boolnullproduct_pd(Unstable) Issues membars on thread state transitionsshare/runtime/globals.hpp
UseMembarJDK6boolppctruedefine_pd_globalcpu/ppc/globals_ppc.hpp
UseMembarJDK6bools390truedefine_pd_globalcpu/s390/globals_s390.hpp
UseMembarJDK6boolsparctruedefine_pd_globalcpu/sparc/globals_sparc.hpp
UseMembarJDK6boolx86truedefine_pd_globalcpu/x86/globals_x86.hpp
UseMembarJDK6boolzerotruedefine_pd_globalcpu/zero/globals_zero.hpp
UseMontgomeryMultiplyIntrinsicJDK8boolfalsediagnosticEnables intrinsification of BigInteger.montgomeryMultiply()share/opto/c2_globals.hpp
UseMontgomerySquareIntrinsicJDK8boolfalsediagnosticEnables intrinsification of BigInteger.montgomerySquare()share/opto/c2_globals.hpp
UseMulAddIntrinsicJDK8boolfalsediagnosticEnables intrinsification of BigInteger.mulAdd()share/opto/c2_globals.hpp
UseMultiplyToLenIntrinsicJDK8boolfalsediagnosticEnables intrinsification of BigInteger.multiplyToLen()share/opto/c2_globals.hpp
UseNUMAInterleavingJDK6boolfalseproductInterleave memory across NUMA nodes if availableshare/runtime/globals.hpp
UseNUMAJDK6boolfalseproductUse NUMA if availableshare/runtime/globals.hpp
UseNeonJDK9boolaarch64falseproductUse Neon for CRC32 computationcpu/aarch64/globals_aarch64.hpp
UseNewCode2JDK6boolfalsediagnosticTesting Only: Use the new version while testingshare/runtime/globals.hpp
UseNewCode3JDK6boolfalsediagnosticTesting Only: Use the new version while testingshare/runtime/globals.hpp
UseNewCodeJDK6boolfalsediagnosticTesting Only: Use the new version while testingshare/runtime/globals.hpp
UseNewLongLShiftJDK6boolx86falseproductUse optimized bitwise shift leftcpu/x86/globals_x86.hpp
UseNiagaraInstrsJDK6boolsparcfalseproductUse Niagara-efficient instruction subsetcpu/sparc/globals_sparc.hpp
UseOSErrorReportingJDK6boolaixfalsedefine_pd_globalos/aix/globals_aix.hpp
UseOSErrorReportingJDK6boolbsdfalsedefine_pd_globalos/bsd/globals_bsd.hpp
UseOSErrorReportingJDK6boollinuxfalsedefine_pd_globalos/linux/globals_linux.hpp
UseOSErrorReportingJDK6boolnullproduct_pdLet VM fatal error propagate to the OS (ie. WER on Windows)share/runtime/globals.hpp
UseOSErrorReportingJDK6boolsolarisfalsedefine_pd_globalos/solaris/globals_solaris.hpp
UseOSErrorReportingJDK6boolwindowsfalsedefine_pd_global// for now.os/windows/globals_windows.hpp
UseOnStackReplacementJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
UseOnStackReplacementJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
UseOnStackReplacementJDK6boolnullproduct_pdUse on stack replacement, calls runtime if invoc. counter overflows in loopshare/runtime/globals.hpp
UseOnStackReplacementJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
UseOnStackReplacementJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
UseOnStackReplacementJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
UseOnStackReplacementJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
UseOnlyInlinedBimorphicJDK6booltrueproductDon't use BimorphicInlining if can't inline a second methodshare/opto/c2_globals.hpp
UseOprofileJDK6boolbsdfalseproductenable support for Oprofile profileros/bsd/globals_bsd.hpp
UseOprofileJDK6boollinuxfalseproductenable support for Oprofile profileros/linux/globals_linux.hpp
UseOptoBiasInliningJDK6booltrueproductGenerate biased locking code in C2 ideal graphshare/opto/c2_globals.hpp
UsePSAdaptiveSurvivorSizePolicyJDK6booltrueproductUse adaptive survivor sizing policiesshare/runtime/globals.hpp
UseParallelGCJDK6boolfalseproductUse the Parallel Scavenge garbage collectorshare/runtime/globals.hpp
UseParallelOldGCJDK6boolfalseproductUse the Parallel Old garbage collectorshare/runtime/globals.hpp
UsePerfDataJDK6booltrueproductFlag to disable jvmstat instrumentation for performance testing and problem isolation purposesshare/runtime/globals.hpp
UsePopCountInstructionJDK6boolfalseproductUse population count instructionshare/runtime/globals.hpp
UsePower6SchedulerPPC64JDK8boolppcfalseproductUse Power6 Scheduler.cpu/ppc/globals_ppc.hpp
UsePrivilegedStackJDK6booltruedevelopEnable the security JVM functionsshare/runtime/globals.hpp
UsePthreadsJDK6boolfalsedevelopUse pthread-based instead of libthread-based synchronization (SPARC only)share/runtime/globals.hpp
UseRDPCForConstantTableBaseJDK6boolfalseproductUse Sparc RDPC instruction for the constant table base.share/opto/c2_globals.hpp
UseRTMDeoptJDK8boolppcfalseproductPerform deopt and recompilation based on RTM abort ratiocpu/ppc/globals_ppc.hpp
UseRTMDeoptJDK8boolx86falseproductPerform deopt and recompilation based on RTM abort ratiocpu/x86/globals_x86.hpp
UseRTMForStackLocksJDK8boolppcfalseexperimentalEnable RTM lock eliding for stack locks in compiled codecpu/ppc/globals_ppc.hpp
UseRTMForStackLocksJDK8boolx86falseexperimentalEnable RTM lock eliding for stack locks in compiled codecpu/x86/globals_x86.hpp
UseRTMLockingJDK8boolppcfalseproductEnable RTM lock eliding for inflated locks in compiled codecpu/ppc/globals_ppc.hpp
UseRTMLockingJDK8boolx86falseproductEnable RTM lock eliding for inflated locks in compiled codecpu/x86/globals_x86.hpp
UseRTMXendForLockBusyJDK8boolppctrueexperimentalUse RTM Xend instead of Xabort when lock busycpu/ppc/globals_ppc.hpp
UseRTMXendForLockBusyJDK8boolx86trueexperimentalUse RTM Xend instead of Xabort when lock busycpu/x86/globals_x86.hpp
UseRotateAndMaskInstructionsPPC64JDK8boolppctrueproductUse rotate and mask instructions.cpu/ppc/globals_ppc.hpp
UseSHA1IntrinsicsJDK8boolfalsediagnosticUse intrinsics for SHA-1 crypto hash function. Requires that UseSHA is enabled.share/runtime/globals.hpp
UseSHA256IntrinsicsJDK8boolfalsediagnosticUse intrinsics for SHA-224 and SHA-256 crypto hash functions. Requires that UseSHA is enabled.share/runtime/globals.hpp
UseSHA512IntrinsicsJDK8boolfalsediagnosticUse intrinsics for SHA-384 and SHA-512 crypto hash functions. Requires that UseSHA is enabled.share/runtime/globals.hpp
UseSHAJDK8boolfalseproductControl whether SHA instructions are used when availableshare/runtime/globals.hpp
UseSHMJDK6boolbsdfalseproductUse SYSV shared memory for large pagesos/bsd/globals_bsd.hpp
UseSHMJDK6boollinuxfalseproductUse SYSV shared memory for large pagesos/linux/globals_linux.hpp
UseSIGTRAPJDK8boolppctrueproductAllow trap instructions that make use of SIGTRAP. Use this to switch off all optimizations requiring SIGTRAP.cpu/ppc/globals_ppc.hpp
UseSIMDForMemoryOpsJDK9boolaarch64falseproductUse SIMD instructions in generated memory move codecpu/aarch64/globals_aarch64.hpp
UseSSE42IntrinsicsJDK6boolx86falseproductSSE4.2 versions of intrinsicscpu/x86/globals_x86.hpp
UseSSEJDK6intx99
range(0, 99)
productHighest supported SSE instructions set on x86/x64share/runtime/globals.hpp
UseSemaphoreGCThreadsSynchronizationJDK9booltruediagnosticUse semaphore synchronization for the GC Threads, instead of synchronization based on mutexesshare/runtime/globals.hpp
UseSerialGCJDK6boolfalseproductUse the Serial garbage collectorshare/runtime/globals.hpp
UseSharedSpacesJDK6booltrueproductUse shared spaces for metadatashare/runtime/globals.hpp
UseSignalChainingJDK6booltrueproductUse signal-chaining to invoke signal handlers installed by the application (Solaris & Linux only)share/runtime/globals.hpp
UseSimulatorCacheJDK9boolaarch64falseproducttell sim to cache memory updates until exclusive op occurscpu/aarch64/globals_aarch64.hpp
UseSlowPathJDK6boolfalsedevelopFor debugging: test slow cases by always using themshare/c1/c1_globals.hpp
UseSquareToLenIntrinsicJDK8boolfalsediagnosticEnables intrinsification of BigInteger.squareToLen()share/opto/c2_globals.hpp
UseStackBangingJDK6booltruedevelopuse stack banging for stack overflow checks (required for proper StackOverflow handling; disable only to measure cost of stackbanging)share/runtime/globals.hpp
UseStaticBranchPredictionForUncommonPathsPPC64JDK8boolppcfalseproductUse static branch prediction hints for uncommon paths.cpu/ppc/globals_ppc.hpp
UseStaticBranchPredictionInCompareAndSwapPPC64JDK8boolppctrueproductUse static branch prediction hints in CAS operations.cpu/ppc/globals_ppc.hpp
UseStoreImmI16JDK6boolx86trueproductUse store immediate 16-bits value instruction on x86cpu/x86/globals_x86.hpp
UseStrictFPJDK6booltruedevelopuse strict fp if modifier strictfp is setshare/runtime/globals.hpp
UseStringDeduplicationJDK8boolfalseproductUse string deduplicationshare/runtime/globals.hpp
UseSubwordForMaxVectorJDK10booltrueproductUse Subword Analysis to set maximum vector sizeshare/opto/c2_globals.hpp
UseSuperWordJDK6booltrueproductTransform scalar operations into superword operationsshare/opto/c2_globals.hpp
UseTLABJDK6boolaarch64truedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
UseTLABJDK6boolarmtruedefine_pd_globalcpu/arm/c2_globals_arm.hpp
UseTLABJDK6boolnullproduct_pdUse thread-local object allocationshare/runtime/globals.hpp
UseTLABJDK6boolppctruedefine_pd_globalcpu/ppc/c2_globals_ppc.hpp
UseTLABJDK6bools390truedefine_pd_globalcpu/s390/c2_globals_s390.hpp
UseTLABJDK6boolsparctruedefine_pd_globalcpu/sparc/c2_globals_sparc.hpp
UseTLABJDK6boolx86truedefine_pd_globalcpu/x86/c1_globals_x86.hpp
UseTableRangesJDK6booltruedevelopFaster versions of lookup table using rangesshare/c1/c1_globals.hpp
UseThreadPrioritiesJDK6boolnullproduct_pdUse native thread prioritiesshare/runtime/globals.hpp
UseThreadPrioritiesJDK6boolsolarisfalsedefine_pd_globalos/solaris/globals_solaris.hpp
UseTransparentHugePagesJDK8boollinuxfalseproductUse MADV_HUGEPAGE for large pagesos/linux/globals_linux.hpp
UseTypeProfileJDK6boolaarch64falsedefine_pd_globalcpu/aarch64/c1_globals_aarch64.hpp
UseTypeProfileJDK6boolarmfalsedefine_pd_globalcpu/arm/c1_globals_arm.hpp
UseTypeProfileJDK6booltrueproductCheck interpreter profile for historically monomorphic callsshare/runtime/globals.hpp
UseTypeProfileJDK6boolppcfalsedefine_pd_globalcpu/ppc/c1_globals_ppc.hpp
UseTypeProfileJDK6bools390falsedefine_pd_globalcpu/s390/c1_globals_s390.hpp
UseTypeProfileJDK6boolsparcfalsedefine_pd_globalcpu/sparc/c1_globals_sparc.hpp
UseTypeProfileJDK6boolx86falsedefine_pd_globalcpu/x86/c1_globals_x86.hpp
UseTypeSpeculationJDK8booltrueproductSpeculatively propagate types from profilesshare/opto/c2_globals.hpp
UseUTCFileTimestampJDK6boolwindowstrueproductAdjust the timestamp returned from stat() to be UTCos/windows/globals_windows.hpp
UseUnalignedAccessesJDK9boolfalsediagnosticUse unaligned memory accesses in Unsafeshare/runtime/globals.hpp
UseUnalignedLoadStoresJDK6boolx86falseproductUse SSE2 MOVDQU instruction for Arraycopycpu/x86/globals_x86.hpp
UseUniqueSubclassesJDK6booltruedevelopNarrow an abstract reference to the unique concrete subclassshare/opto/c2_globals.hpp
UseVISJDK6intxsparc99
range(0, 99)
productHighest supported VIS instructions set on SPARCcpu/sparc/globals_sparc.hpp
UseVectorCmovJDK10boolfalseproductUse Vectorized Cmovshare/opto/c2_globals.hpp
UseVectorizedMismatchIntrinsicJDK9boolfalsediagnosticEnables intrinsification of ArraysSupport.vectorizedMismatch()share/runtime/globals.hpp
UseXMMForArrayCopyJDK6boolfalseproductUse SSE2 MOVQ instruction for Arraycopyshare/runtime/globals.hpp
UseXmmI2DJDK6boolx86falseproductUse SSE2 CVTDQ2PD instruction to convert Integer to Doublecpu/x86/globals_x86.hpp
UseXmmI2FJDK6boolx86falseproductUse SSE2 CVTDQ2PS instruction to convert Integer to Floatcpu/x86/globals_x86.hpp
UseXmmLoadAndClearUpperJDK6boolx86trueproductLoad low part of XMM register and clear upper partcpu/x86/globals_x86.hpp
UseXmmRegToRegMoveAllJDK6boolx86falseproductCopy all XMM register bits when moving value between registerscpu/x86/globals_x86.hpp
VMThreadHintNoPreemptJDK6boolfalseproduct(Solaris only) Give VM thread an extra quantashare/runtime/globals.hpp
VMThreadPriorityJDK6intx-1
range(-1, 127)
productThe native priority at which the VM thread should run (-1 means no change)share/runtime/globals.hpp
VMThreadStackSizeJDK6intxaixppc2048define_pd_globalos_cpu/aix_ppc/globals_aix_ppc.hpp
VMThreadStackSizeJDK6intxbsdx86512define_pd_globalos_cpu/bsd_x86/globals_bsd_x86.hpp
VMThreadStackSizeJDK6intxbsdzero512define_pd_globalos_cpu/bsd_zero/globals_bsd_zero.hpp
VMThreadStackSizeJDK6intxlinuxaarch642048define_pd_globalos_cpu/linux_aarch64/globals_linux_aarch64.hpp
VMThreadStackSizeJDK6intxlinuxarm512define_pd_globalos_cpu/linux_arm/globals_linux_arm.hpp
VMThreadStackSizeJDK6intxlinuxppc2048define_pd_globalos_cpu/linux_ppc/globals_linux_ppc.hpp
VMThreadStackSizeJDK6intxlinuxs3901024define_pd_globalos_cpu/linux_s390/globals_linux_s390.hpp
VMThreadStackSizeJDK6intxlinuxx86512define_pd_globalos_cpu/linux_x86/globals_linux_x86.hpp
VMThreadStackSizeJDK6intxlinuxzero512define_pd_globalos_cpu/linux_zero/globals_linux_zero.hpp
VMThreadStackSizeJDK6intxnull
range(0, max_intx/(1 * K))
product_pdNon-Java Thread Stack Size (in Kbytes)share/runtime/globals.hpp
VMThreadStackSizeJDK6intxsparc1024define_pd_globalcpu/sparc/globals_sparc.hpp
VMThreadStackSizeJDK6intxsolarisx86512define_pd_globalos_cpu/solaris_x86/globals_solaris_x86.hpp
VMThreadStackSizeJDK6intxwindowsx860define_pd_global// 0 => use system defaultos_cpu/windows_x86/globals_windows_x86.hpp
ValueMapInitialSizeJDK6intx11
range(1, NOT_LP64(1*K) LP64_ONLY(32*K))
productInitial size of a value mapshare/c1/c1_globals.hpp
ValueMapMaxLoopSizeJDK6intx8
range(0, 128)
productmaximum size of a loop optimized by global value numberingshare/c1/c1_globals.hpp
ValueSearchLimitJDK6intx1000
range(0, max_jint)
productRecursion limit in PhaseMacroExpand::value_from_mem_phishare/opto/c2_globals.hpp
VerboseInternalVMTestsJDK8boolfalsenotproductTurn on logging for internal VM tests.share/runtime/globals.hpp
VerboseJDK6boolfalsedevelopPrint additional debugging information from other modesshare/runtime/globals.hpp
VerifyActivationFrameSizeJDK6boolfalsedevelopVerify that activation frame didn't become smaller than its minimal sizeshare/runtime/globals.hpp
VerifyAdapterCallsJDK8booltrueInDebugdiagnosticVerify that i2c/c2i adapters are called properlyshare/runtime/globals.hpp
VerifyAdapterSharingJDK6boolfalsedevelopVerify that the code for shared adapters is the equivalentshare/runtime/globals.hpp
VerifyAfterGCJDK6boolfalsediagnosticVerify memory system after GCshare/runtime/globals.hpp
VerifyAliasesJDK6boolfalsedevelopperform extra checks on the results of alias analysisshare/opto/c2_globals.hpp
VerifyBeforeExitJDK6booltrueInDebugdiagnosticVerify system before exitingshare/runtime/globals.hpp
VerifyBeforeGCJDK6boolfalsediagnosticVerify memory system before GCshare/runtime/globals.hpp
VerifyBeforeIterationJDK6boolfalsediagnosticVerify memory system before JVMTI iterationshare/runtime/globals.hpp
VerifyBlockOffsetArrayJDK6boolfalsedevelopDo (expensive) block offset array verificationshare/runtime/globals.hpp
VerifyCodeCacheJDK9boolfalsenotproductVerify code cache on memory allocation/deallocationshare/runtime/globals.hpp
VerifyCompiledCodeJDK6boolfalsedevelopInclude miscellaneous runtime verifications in nmethod code; default off because it disturbs nmethod size heuristicsshare/runtime/globals.hpp
VerifyConnectionGraphJDK8booltruenotproductVerify Connection Graph construction in Escape Analysisshare/opto/c2_globals.hpp
VerifyDUIteratorsJDK6booltruenotproductVerify the safety of all iterations of Bi-directional Edgesshare/opto/c2_globals.hpp
VerifyDataPointerJDK6booltrueInDebugdevelopVerify the method data pointer during interpreter profilingshare/runtime/globals.hpp
VerifyDependenciesJDK6booltrueInDebugdevelopExercise and verify the compilation dependency mechanismshare/runtime/globals.hpp
VerifyDuringGCJDK6boolfalsediagnosticVerify memory system during GC (between phases)share/runtime/globals.hpp
VerifyDuringStartupJDK8boolfalsediagnosticVerify memory system before executing any Java code during VM initializationshare/runtime/globals.hpp
VerifyFPUJDK6boolfalsedevelopVerify FPU state (check for NaN's, etc.)share/runtime/globals.hpp
VerifyGCLevelJDK6intx0
range(0, 1)
diagnosticGeneration level at which to start +VerifyBefore/AfterGCshare/runtime/globals.hpp
VerifyGCStartAtJDK6uintx0
range(0, max_uintx)
diagnosticGC invoke count where +VerifyBefore/AfterGC kicks inshare/runtime/globals.hpp
VerifyGCTypeJDK10ccstrlistGC type(s) to verify when Verify*GC is enabled.Available types are collector specific.diagnosticshare/runtime/globals.hpp
VerifyGraphEdgesJDK6boolfalsenotproductVerify Bi-directional Edgesshare/opto/c2_globals.hpp
VerifyHashTableKeysJDK6booltruenotproductVerify the immutability of keys in the VN hash tablesshare/opto/c2_globals.hpp
VerifyIdealNodeCountJDK8boolfalsenotproductVerify that tracked dead ideal node count is accurateshare/opto/c2_globals.hpp
VerifyInterpreterStackTopJDK9boolarmfalsedevelopVerify interpreter stack top at every stack expansion (AArch64 only)cpu/arm/globals_arm.hpp
VerifyIterativeGVNJDK6boolfalsedevelopVerify Def-Use modifications during sparse Iterative Global Value Numberingshare/opto/c2_globals.hpp
VerifyJNIEnvThreadJDK6boolfalsenotproductVerify JNIEnv.thread == Thread::current() when entering VM from JNIshare/runtime/globals.hpp
VerifyJNIFieldsJDK6booltrueInDebugdevelopVerify jfieldIDs for instance fieldsshare/runtime/globals.hpp
VerifyLastFrameJDK6boolfalsenotproductVerify oops on last frame on entry to VMshare/runtime/globals.hpp
VerifyLoopOptimizationsJDK6boolfalsenotproductverify major loop optimizationsshare/opto/c2_globals.hpp
VerifyMergedCPBytecodesJDK6booltrueproductVerify bytecodes after RedefineClasses constant pool mergingshare/runtime/globals.hpp
VerifyMethodHandlesJDK6booltrueInDebugdiagnosticperform extra checks when constructing method handlesshare/runtime/globals.hpp
VerifyObjectStartArrayJDK6booltruediagnosticVerify GC object start array if verify before/aftershare/runtime/globals.hpp
VerifyOopsJDK6boolfalsedevelopDo plausibility checks for oopsshare/runtime/globals.hpp
VerifyOptoOopOffsetsJDK6boolfalsenotproductCheck types of base addresses in field referencesshare/opto/c2_globals.hpp
VerifyOptoJDK6boolfalsenotproductApply more time consuming verification during compilationshare/opto/c2_globals.hpp
VerifyRegisterAllocatorJDK6boolfalse
range(0, max_jint)
notproductVerify Register Allocatorshare/opto/c2_globals.hpp
VerifyRememberedSetsJDK6boolfalsediagnosticVerify GC remembered setsshare/runtime/globals.hpp
VerifySharedSpacesJDK8boolfalseproductVerify shared spaces (false for default archive, true for archive specified by -XX:SharedArchiveFile)share/runtime/globals.hpp
VerifyStackAtCallsJDK6boolfalsedevelopVerify that the stack pointer is unchanged after callsshare/runtime/globals.hpp
VerifyStackJDK6boolfalsedevelopVerify stack of each thread when it is entering a runtime callshare/runtime/globals.hpp
VerifyStringTableAtExitJDK8boolfalsediagnosticverify StringTable contents at exitshare/runtime/globals.hpp
VerifySubSetJDK8ccstrlistMemory sub-systems to verify when Verify*GC flag(s) are enabled. One or more sub-systems can be specified in a comma separated string. Sub-systems are: threads, heap, symbol_table, string_table, codecache, dictionary, classloader_data_graph, metaspace, jni_handles, codecache_oopsdiagnosticshare/runtime/globals.hpp
VerifyThreadJDK6boolfalsedevelopWatch the thread register for corruption (SPARC only)share/runtime/globals.hpp
WalkStackALotJDK6boolfalsenotproductTrace stack (no print) at every exit from the runtime systemshare/runtime/globals.hpp
WarmCallMaxSizeJDK6intx999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
developsize of the largest inlinable methodshare/opto/c2_globals.hpp
WarmCallMaxWorkJDK6intx999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
developexecution time of the largest inlinable methodshare/opto/c2_globals.hpp
WarmCallMinCountJDK6intx-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
developnumber of calls (per method invocation) to enable inliningshare/opto/c2_globals.hpp
WarmCallMinProfitJDK6intx-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))
developnumber of calls (per method invocation) to enable inliningshare/opto/c2_globals.hpp
WarnOnStalledSpinLockJDK6uintx0notproductPrint warnings for stalled SpinLocksshare/runtime/globals.hpp
WhiteBoxAPIJDK8boolfalsediagnosticEnable internal testing APIsshare/runtime/globals.hpp
WizardModeJDK6boolfalsedevelopPrint much more debugging informationshare/runtime/globals.hpp
WorkStealingHardSpinsJDK6uintx4096experimentalNumber of iterations in a spin loop between checks on time out of hard spinshare/runtime/globals.hpp
WorkStealingSleepMillisJDK6uintx1experimentalSleep time when sleep is used for yieldsshare/runtime/globals.hpp
WorkStealingSpinToYieldRatioJDK6uintx10experimentalRatio of hard spins to calls to yieldshare/runtime/globals.hpp
WorkStealingYieldsBeforeSleepJDK6uintx5000experimentalNumber of yields before a sleep is done during work stealingshare/runtime/globals.hpp
YoungGenerationSizeIncrementJDK6uintx20
range(0, 100)
productAdaptive size percentage change in young generationshare/runtime/globals.hpp
YoungGenerationSizeSupplementDecayJDK6uintx8
range(1, max_uintx)
productDecay factor to YoungedGenerationSizeSupplementshare/runtime/globals.hpp
YoungGenerationSizeSupplementJDK6uintx80
range(0, 100)
productSupplement to YoungedGenerationSizeIncrement used at startupshare/runtime/globals.hpp
YoungPLABSizeJDK6size_t4096productSize of young gen promotion LAB's (in HeapWords)share/runtime/globals.hpp
ZapEmptyStackFieldsJDK9bools390falsedevelopWrite 0x0101... to empty stack fields. Use this to ease stack debugging.cpu/s390/globals_s390.hpp
ZapFillerObjectsJDK6booltrueInDebugdevelopZap filler objects with 0xDEAFBABEshare/runtime/globals.hpp
ZapHighNonSignificantBitsJDK9boolarmfalsedevelopZap high non-significant bits of values (AArch64 only)cpu/arm/globals_arm.hpp
ZapMemoryJDK8boolppcfalseproductWrite 0x0101... to empty memory. Use this to ease debugging.cpu/ppc/globals_ppc.hpp
ZapResourceAreaJDK6booltrueInDebugdevelopZap freed resource/arena space with 0xABABABABshare/runtime/globals.hpp
ZapStackSegmentsJDK6booltrueInDebugnotproductZap allocated/freed stack segments with 0xFADFADEDshare/runtime/globals.hpp
ZapUnusedHeapAreaJDK6booltrueInDebugdevelopZap unused heap space with 0xBAADBABEshare/runtime/globals.hpp
ZapVMHandleAreaJDK6booltrueInDebugnotproductZap freed VM handle space with 0xBCBCBCBCshare/runtime/globals.hpp
ZeroTLABJDK6boolfalseproductZero out the newly created TLABshare/runtime/globals.hpp
ZombieALotIntervalJDK6intx5notproductNumber of exits until ZombieALot kicks inshare/runtime/globals.hpp
ZombieALotJDK6boolfalsenotproductCreate zombies (non-entrant) at exit from the runtime systemshare/runtime/globals.hpp
hashCodeJDK6intx5experimental(Unstable) select hashCode generation algorithmshare/runtime/globals.hpp