? ? ?讓我們來看看在Java環(huán)境中可以配置的21個最重要的JVM選項和參數(shù)。

1. -Xms：將設(shè)置JVM的初始堆大小。

2. -Xmx：將設(shè)置JVM的最大堆大小。

3. -Xss：將設(shè)置每個線程的內(nèi)部使用的線程堆棧的大小。

4. -XX：+UseCompressedOops：啟用使用壓縮對象指針以減少內(nèi)存使用的功能。

5. -XX：+UseThreadPriorities：將指示JVM使用本機線程優(yōu)先級。

6. -XX：PermSize：將設(shè)置垃圾收集器永久生成空間的初始大小。

7. -XX：MaxPermSize：將設(shè)置垃圾收集器永久生成空間的最大大小。

8. -XX：NewSize：設(shè)置年輕代空間的初始大小。

9. -XX：MaxNewSize：設(shè)置年輕代空間的最大大小。

10. -XX：SurvivorRatio：設(shè)置伊甸園空間與幸存者空間的比例。

11. -XX：MaxTenuringThreshold：設(shè)置幸存者空間中對象的最大年齡。

12. -XX：+UseParNewGC：指示JVM使用新的并行生成垃圾收集器。

13. -XX：+UseSerialGC：指示JVM使用串行垃圾收集器。

14. -XX：+UseG1GC：指示JVM使用Garbage First（G1）垃圾收集器。

15. -XX：+UseZGC：指示JVM使用ZGC垃圾收集器。

16. -XX：+HeapDumpOnOutOfMemoryError：告訴JVM在發(fā)生OutOfMemoryError時創(chuàng)建堆轉(zhuǎn)儲文件。

17. -XX：HeapDumpPath：為JVM提供自定義路徑，在堆轉(zhuǎn)儲期間寫入堆的內(nèi)容。

18. -Djava.library.path：允許您指定在運行時需要的本機庫的路徑。

19. -Duser.timezone：允許您為JVM設(shè)置自定義時區(qū)。

20. -XX：+PrintGCDetails：指示JVM打印詳細的垃圾回收日志，以幫助您進行GC優(yōu)化。

21. -XX：+PrintFlagsFinal-version：將打印在JVM上設(shè)置的所有當(dāng)前配置的標志和選項。

1如何使用Java JVM選項

所有這些JVM選項都可以通過將它們作為文本附加到Java運行時命令后來簡單地使用。

例如，以下命令將使用六個不同的參數(shù)運行名為Go的應(yīng)用程序，以優(yōu)化內(nèi)存分配和垃圾回收：

java Go -XX:MaxPermSize=128m -XX:MaxNewSize=256m -Xms768m -Xmx768m -XX:SurvivorRatio=128 -XX:MaxTenuringThreshold=0

Java JVM選項可用于管理內(nèi)存和優(yōu)化GC性能。

2最常用的JVM參數(shù)

在列舉的所有 JVM 選項中，最常用的是 Xms 和 Xmx，分別設(shè)置最小堆大小和最大堆大小。

下面的示例將最小堆大小設(shè)置為 768 MB，最大堆大小設(shè)置為 2 GB。

-Xms768m

-Xmx2048

3GC 選擇 JVM 選項

Java的一個優(yōu)點是它為開發(fā)者執(zhí)行垃圾回收，這使得應(yīng)用程序更加健壯，更不容易發(fā)生內(nèi)存泄漏問題。

有許多垃圾回收器可用，具有各種暫停行為和停頓時間。

在啟動運行時，您只能使用以下 Java JVM 選項之一選擇一個垃圾收集器：

-XX:+UseSerialGC

-XX:+UseParallelGC

-XX:+USeParNewGC

-XX:+UseG1GC

-XX:+UseZGC

4垃圾回收調(diào)優(yōu)選項

VM實現(xiàn)了一種分代垃圾回收算法，它積極監(jiān)控新對象，而很少檢查舊對象。JVM管理eden空間、tenured空間甚至PermGen空間的方式可以通過JVM選項進行配置，如下：

-XX:MaxPermSize

-XX:PermSize

-XX:NewSize

-XX:MaxNewSize

-XX:SurvivorRatio

-XX:MaxTenuringThreshold

5用于檢查的JVM打印選項

JVM還提供了一些打印方法，允許您查看Java運行時的狀態(tài)。有用的JVM打印選項包括：

-XX:+PrintGCDetails

-XX:+PrintGCDateStamps

-XX:+PrintHeapAtGC

-XX:+PrintCommandLineFlags

-XX:+PrintFlagsFinal

PrintFlagsFinal是一項有趣的JVM選項，它將顯示所有JVM標志設(shè)置的詳細信息，輸出內(nèi)容有超過500行。本文介紹的Java JVM選項已經(jīng)全部講解完畢，如果你對PrintFlagsFinal JVM標志的詳細輸出感興趣，可以查看上文提到的輸出內(nèi)容。

$ java -XX:+PrintFlagsFinal -version

[Global flags]

int ActiveProcessorCount = -1

uintx AdaptiveSizeDecrementScaleFactor = 4

uintx AdaptiveSizeMajorGCDecayTimeScale = 10

uintx AdaptiveSizePolicyCollectionCostMargin = 50

uintx AdaptiveSizePolicyInitializingSteps = 20

uintx AdaptiveSizePolicyOutputInterval = 0

uintx AdaptiveSizePolicyWeight = 10

uintx AdaptiveSizeThroughPutPolicy = 0

uintx AdaptiveTimeWeight = 25

bool AggressiveHeap = false

intx AliasLevel = 3

bool AlignVector = false

ccstr AllocateHeapAt =

intx AllocateInstancePrefetchLines = 1

intx AllocatePrefetchDistance = 256

intx AllocatePrefetchInstr = 0

intx AllocatePrefetchLines = 3

intx AllocatePrefetchStepSize = 64

intx AllocatePrefetchStyle = 1

bool AllowParallelDefineClass = false

bool AllowRedefinitionToAddDeleteMethods = false

bool AllowUserSignalHandlers = false

bool AllowVectorizeOnDemand = true

bool AlwaysActAsServerClassMachine = false

bool AlwaysCompileLoopMethods = false

bool AlwaysLockClassLoader = false

bool AlwaysPreTouch = false

bool AlwaysRestoreFPU = false

bool AlwaysTenure = false

ccstr ArchiveClassesAtExit =

intx ArrayCopyLoadStoreMaxElem = 8

size_t AsyncLogBufferSize = 2097152

intx AutoBoxCacheMax = 128

intx BCEATraceLevel = 0

bool BackgroundCompilation = true

size_t BaseFootPrintEstimate = 268435456

intx BiasedLockingBulkRebiasThreshold = 20

intx BiasedLockingBulkRevokeThreshold = 40

intx BiasedLockingDecayTime = 25000

intx BiasedLockingStartupDelay = 0

bool BlockLayoutByFrequency = true

intx BlockLayoutMinDiamondPercentage = 20

bool BlockLayoutRotateLoops = true

intx C1InlineStackLimit = 5

intx C1MaxInlineLevel = 9

intx C1MaxInlineSize = 35

intx C1MaxRecursiveInlineLevel = 1

intx C1MaxTrivialSize = 6

bool C1OptimizeVirtualCallProfiling = true

bool C1ProfileBranches = true

bool C1ProfileCalls = true

bool C1ProfileCheckcasts = true

bool C1ProfileInlinedCalls = true

bool C1ProfileVirtualCalls = true

bool C1UpdateMethodData = true

intx CICompilerCount = 4

bool CICompilerCountPerCPU = true

bool CITime = false

bool CheckJNICalls = false

bool ClassUnloading = true

bool ClassUnloadingWithConcurrentMark = true

bool ClipInlining = true

uintx CodeCacheExpansionSize = 65536

bool CompactStrings = true

ccstr CompilationMode = default

ccstrlist CompileCommand =

ccstr CompileCommandFile =

ccstrlist CompileOnly =

intx CompileThreshold = 10000

double CompileThresholdScaling = 1.000000

intx CompilerThreadPriority = -1

intx CompilerThreadStackSize = 0

size_t CompressedClassSpaceSize = 1073741824

uint ConcGCThreads = 3

intx ConditionalMoveLimit = 3

intx ContendedPaddingWidth = 128

bool CrashOnOutOfMemoryError = false

bool CreateCoredumpOnCrash = true

bool CriticalJNINatives = false

bool DTraceAllocProbes = false

bool DTraceMethodProbes = false

bool DTraceMonitorProbes = false

bool DisableAttachMechanism = false

bool DisableExplicitGC = false

bool DisplayVMOutputToStderr = false

bool DisplayVMOutputToStdout = false

bool DoEscapeAnalysis = true

bool DoReserveCopyInSuperWord = true

bool DontCompileHugeMethods = true

bool DontYieldALot = false

ccstr DumpLoadedClassList =

bool DumpReplayDataOnError = true

bool DumpSharedSpaces = false

bool DynamicDumpSharedSpaces = false

bool EagerXrunInit = false

intx EliminateAllocationArraySizeLimit = 64

bool EliminateAllocations = true

bool EliminateAutoBox = true

bool EliminateLocks = true

bool EliminateNestedLocks = true

bool EnableContended = true

bool EnableDynamicAgentLoading = true

size_t ErgoHeapSizeLimit = 0

ccstr ErrorFile =

bool ErrorFileToStderr = false

bool ErrorFileToStdout = false

uint64_t ErrorLogTimeout = 120

double EscapeAnalysisTimeout = 20.000000

bool EstimateArgEscape = true

bool ExecutingUnitTests = false

bool ExitOnOutOfMemoryError = false

bool ExplicitGCInvokesConcurrent = false

bool ExtendedDTraceProbes = false

bool ExtensiveErrorReports = false

ccstr ExtraSharedClassListFile =

bool FilterSpuriousWakeups = true

bool FlightRecorder = false

ccstr FlightRecorderOptions =

bool ForceTimeHighResolution = false

intx FreqInlineSize = 325

double G1ConcMarkStepDurationMillis = 10.000000

uintx G1ConcRSHotCardLimit = 4

size_t G1ConcRSLogCacheSize = 10

size_t G1ConcRefinementGreenZone = 0

size_t G1ConcRefinementRedZone = 0

uintx G1ConcRefinementServiceIntervalMillis = 300

uint G1ConcRefinementThreads = 10

size_t G1ConcRefinementThresholdStep = 2

size_t G1ConcRefinementYellowZone = 0

uintx G1ConfidencePercent = 50

size_t G1HeapRegionSize = 2097152

uintx G1HeapWastePercent = 5

uintx G1MixedGCCountTarget = 8

uintx G1PeriodicGCInterval = 0

bool G1PeriodicGCInvokesConcurrent = true

double G1PeriodicGCSystemLoadThreshold = 0.000000

intx G1RSetRegionEntries = 512

intx G1RSetSparseRegionEntries = 16

intx G1RSetUpdatingPauseTimePercent = 10

uint G1RefProcDrainInterval = 1000

uintx G1ReservePercent = 10

uintx G1SATBBufferEnqueueingThresholdPercent = 60

size_t G1SATBBufferSize = 1024

size_t G1UpdateBufferSize = 256

bool G1UseAdaptiveConcRefinement = true

bool G1UseAdaptiveIHOP = true

uintx GCDrainStackTargetSize = 64

uintx GCHeapFreeLimit = 2

uintx GCLockerEdenExpansionPercent = 5

uintx GCPauseIntervalMillis = 201

uintx GCTimeLimit = 98

uintx GCTimeRatio = 12

size_t HeapBaseMinAddress = 2147483648

bool HeapDumpAfterFullGC = false

bool HeapDumpBeforeFullGC = false

intx HeapDumpGzipLevel = 0

bool HeapDumpOnOutOfMemoryError = false

ccstr HeapDumpPath =

uintx HeapFirstMaximumCompactionCount = 3

uintx HeapMaximumCompactionInterval = 20

uintx HeapSearchSteps = 3

size_t HeapSizePerGCThread = 43620760

bool IgnoreEmptyClassPaths = false

bool IgnoreUnrecognizedVMOptions = false

uintx IncreaseFirstTierCompileThresholdAt = 50

bool IncrementalInline = true

uintx InitialCodeCacheSize = 2555904

size_t InitialHeapSize = 268435456

uintx InitialRAMFraction = 64

double InitialRAMPercentage = 1.562500

uintx InitialSurvivorRatio = 8

uintx InitialTenuringThreshold = 7

uintx InitiatingHeapOccupancyPercent = 45

bool Inline = true

ccstr InlineDataFile =

intx InlineSmallCode = 2500

bool InlineSynchronizedMethods = true

intx InteriorEntryAlignment = 16

intx InterpreterProfilePercentage = 33

bool JavaMonitorsInStackTrace = true

intx JavaPriority10_To_OSPriority = -1

intx JavaPriority1_To_OSPriority = -1

intx JavaPriority2_To_OSPriority = -1

intx JavaPriority3_To_OSPriority = -1

intx JavaPriority4_To_OSPriority = -1

intx JavaPriority5_To_OSPriority = -1

intx JavaPriority6_To_OSPriority = -1

intx JavaPriority7_To_OSPriority = -1

intx JavaPriority8_To_OSPriority = -1

intx JavaPriority9_To_OSPriority = -1

size_t LargePageHeapSizeThreshold = 134217728

size_t LargePageSizeInBytes = 0

intx LiveNodeCountInliningCutoff = 40000

intx LoopMaxUnroll = 16

intx LoopOptsCount = 43

intx LoopPercentProfileLimit = 10

uintx LoopStripMiningIter = 1000

uintx LoopStripMiningIterShortLoop = 100

intx LoopUnrollLimit = 60

intx LoopUnrollMin = 4

bool LoopUnswitching = true

bool ManagementServer = false

size_t MarkStackSize = 4194304

size_t MarkStackSizeMax = 536870912

uint MarkSweepAlwaysCompactCount = 4

uintx MarkSweepDeadRatio = 5

intx MaxBCEAEstimateLevel = 5

intx MaxBCEAEstimateSize = 150

uint64_t MaxDirectMemorySize = 0

bool MaxFDLimit = true

uintx MaxGCMinorPauseMillis = 18446744073709551615

uintx MaxGCPauseMillis = 200

uintx MaxHeapFreeRatio = 70

size_t MaxHeapSize = 4282384384

intx MaxInlineLevel = 15

intx MaxInlineSize = 35

intx MaxJNILocalCapacity = 65536

intx MaxJavaStackTraceDepth = 1024

intx MaxJumpTableSize = 65000

intx MaxJumpTableSparseness = 5

intx MaxLabelRootDepth = 1100

intx MaxLoopPad = 15

size_t MaxMetaspaceExpansion = 5439488

uintx MaxMetaspaceFreeRatio = 70

size_t MaxMetaspaceSize = 18446744073709551615

size_t MaxNewSize = 2569011200

intx MaxNodeLimit = 80000

uint64_t MaxRAM = 137438953472

uintx MaxRAMFraction = 4

double MaxRAMPercentage = 25.000000

intx MaxRecursiveInlineLevel = 1

uintx MaxTenuringThreshold = 15

intx MaxTrivialSize = 6

intx MaxVectorSize = 32

ccstr MetaspaceReclaimPolicy = balanced

size_t MetaspaceSize = 22020096

bool MethodFlushing = true

size_t MinHeapDeltaBytes = 2097152

uintx MinHeapFreeRatio = 40

size_t MinHeapSize = 8388608

intx MinInliningThreshold = 250

intx MinJumpTableSize = 10

size_t MinMetaspaceExpansion = 327680

uintx MinMetaspaceFreeRatio = 40

uintx MinRAMFraction = 2

double MinRAMPercentage = 50.000000

uintx MinSurvivorRatio = 3

size_t MinTLABSize = 2048

intx MultiArrayExpandLimit = 6

uintx NUMAChunkResizeWeight = 20

size_t NUMAInterleaveGranularity = 2097152

uintx NUMAPageScanRate = 256

size_t NUMASpaceResizeRate = 1073741824

bool NUMAStats = false

ccstr NativeMemoryTracking = off

bool NeverActAsServerClassMachine = false

bool NeverTenure = false

uintx NewRatio = 2

size_t NewSize = 1363144

size_t NewSizeThreadIncrease = 5320

intx NmethodSweepActivity = 10

intx NodeLimitFudgeFactor = 2000

uintx NonNMethodCodeHeapSize = 5839372

uintx NonProfiledCodeHeapSize = 122909434

intx NumberOfLoopInstrToAlign = 4

intx ObjectAlignmentInBytes = 8 {

size_t OldPLABSize = 1024

size_t OldSize = 5452592

bool OmitStackTraceInFastThrow = true

ccstrlist OnError =

ccstrlist OnOutOfMemoryError =

intx OnStackReplacePercentage = 140

bool OptimizeFill = false

bool OptimizePtrCompare = true

bool OptimizeStringConcat = true

bool OptoBundling = false

intx OptoLoopAlignment = 16

bool OptoRegScheduling = true

bool OptoScheduling = false

uintx PLABWeight = 75

bool PSChunkLargeArrays = true

int ParGCArrayScanChunk = 50

uintx ParallelGCBufferWastePct = 10

uint ParallelGCThreads = 10

size_t ParallelOldDeadWoodLimiterMean = 50

size_t ParallelOldDeadWoodLimiterStdDev = 80

bool ParallelRefProcBalancingEnabled = true

bool ParallelRefProcEnabled = true

bool PartialPeelAtUnsignedTests = true

bool PartialPeelLoop = true

intx PartialPeelNewPhiDelta = 0

uintx PausePadding = 1

intx PerBytecodeRecompilationCutoff = 200

intx PerBytecodeTrapLimit = 4

intx PerMethodRecompilationCutoff = 400

intx PerMethodTrapLimit = 100

bool PerfAllowAtExitRegistration = false

bool PerfBypassFileSystemCheck = false

intx PerfDataMemorySize = 32768

intx PerfDataSamplingInterval = 50

ccstr PerfDataSaveFile =

bool PerfDataSaveToFile = false

bool PerfDisableSharedMem = false

intx PerfMaxStringConstLength = 1024

size_t PreTouchParallelChunkSize = 1073741824

bool PreferInterpreterNativeStubs = false

intx PrefetchCopyIntervalInBytes = 576

intx PrefetchFieldsAhead = 1

intx PrefetchScanIntervalInBytes = 576

bool PreserveAllAnnotations = false

bool PreserveFramePointer = false

size_t PretenureSizeThreshold = 0

bool PrintClassHistogram = false

bool PrintCodeCache = false

bool PrintCodeCacheOnCompilation = false

bool PrintCommandLineFlags = false

bool PrintCompilation = false

bool PrintConcurrentLocks = false

bool PrintExtendedThreadInfo = false

bool PrintFlagsFinal = true

bool PrintFlagsInitial = false

bool PrintFlagsRanges = false

bool PrintGC = false

bool PrintGCDetails = false

bool PrintHeapAtSIGBREAK = true

bool PrintSharedArchiveAndExit = false

bool PrintSharedDictionary = false

bool PrintStringTableStatistics = false

bool PrintTieredEvents = false

bool PrintVMOptions = false

bool PrintWarnings = true

uintx ProcessDistributionStride = 4

bool ProfileInterpreter = true

intx ProfileMaturityPercentage = 20

uintx ProfiledCodeHeapSize = 122909434

uintx PromotedPadding = 3

uintx QueuedAllocationWarningCount = 0

int RTMRetryCount = 5

bool RangeCheckElimination = true

bool ReassociateInvariants = true

bool RecordDynamicDumpInfo = false

bool ReduceBulkZeroing = true

bool ReduceFieldZeroing = true

bool ReduceInitialCardMarks = true

bool ReduceSignalUsage = false

intx RefDiscoveryPolicy = 0

bool RegisterFinalizersAtInit = true

bool RelaxAccessControlCheck = false

ccstr ReplayDataFile =

bool RequireSharedSpaces = false

uintx ReservedCodeCacheSize = 251658240

bool ResizePLAB = true

bool ResizeTLAB = true

bool RestoreMXCSROnJNICalls = false

bool RestrictContended = true

bool RestrictReservedStack = true

bool RewriteBytecodes = true

bool RewriteFrequentPairs = true

bool SafepointTimeout = false

intx SafepointTimeoutDelay = 10000

bool ScavengeBeforeFullGC = false

bool SegmentedCodeCache = true

intx SelfDestructTimer = 0

ccstr SharedArchiveConfigFile =

ccstr SharedArchiveFile =

size_t SharedBaseAddress = 34359738368

ccstr SharedClassListFile =

uintx SharedSymbolTableBucketSize = 4

ccstr ShenandoahGCHeuristics = adaptive

ccstr ShenandoahGCMode = satb

bool ShowCodeDetailsInExceptionMessages = true

bool ShowMessageBoxOnError = false

bool ShrinkHeapInSteps = true

size_t SoftMaxHeapSize = 4282384384

intx SoftRefLRUPolicyMSPerMB = 1000

bool SplitIfBlocks = true

intx StackRedPages = 1

intx StackReservedPages = 0

intx StackShadowPages = 7

bool StackTraceInThrowable = true

intx StackYellowPages = 3

uintx StartAggressiveSweepingAt = 10

bool StartAttachListener = false

ccstr StartFlightRecording =

uint StringDeduplicationAgeThreshold = 3

uintx StringTableSize = 65536

bool SuperWordLoopUnrollAnalysis = true

bool SuperWordReductions = true

bool SuppressFatalErrorMessage = false

uintx SurvivorPadding = 3

uintx SurvivorRatio = 8

double SweeperThreshold = 0.500000

uintx TLABAllocationWeight = 35

uintx TLABRefillWasteFraction = 64

size_t TLABSize = 0

bool TLABStats = true

uintx TLABWasteIncrement = 4

uintx TLABWasteTargetPercent = 1

uintx TargetPLABWastePct = 10

uintx TargetSurvivorRatio = 50

uintx TenuredGenerationSizeIncrement = 20

uintx TenuredGenerationSizeSupplement = 80

uintx TenuredGenerationSizeSupplementDecay = 2

intx ThreadPriorityPolicy = 0

bool ThreadPriorityVerbose = false

intx ThreadStackSize = 0

uintx ThresholdTolerance = 10

intx Tier0BackedgeNotifyFreqLog = 10

intx Tier0InvokeNotifyFreqLog = 7

intx Tier0ProfilingStartPercentage = 200

intx Tier23InlineeNotifyFreqLog = 20

intx Tier2BackEdgeThreshold = 0

intx Tier2BackedgeNotifyFreqLog = 14

intx Tier2CompileThreshold = 0

intx Tier2InvokeNotifyFreqLog = 11

intx Tier3BackEdgeThreshold = 60000

intx Tier3BackedgeNotifyFreqLog = 13

intx Tier3CompileThreshold = 2000

intx Tier3DelayOff = 2

intx Tier3DelayOn = 5

intx Tier3InvocationThreshold = 200

intx Tier3InvokeNotifyFreqLog = 10

intx Tier3LoadFeedback = 5

intx Tier3MinInvocationThreshold = 100

intx Tier4BackEdgeThreshold = 40000

intx Tier4CompileThreshold = 15000

intx Tier4InvocationThreshold = 5000

intx Tier4LoadFeedback = 3

intx Tier4MinInvocationThreshold = 600

bool TieredCompilation = true

intx TieredCompileTaskTimeout = 50

intx TieredRateUpdateMaxTime = 25

intx TieredRateUpdateMinTime = 1

intx TieredStopAtLevel = 4

bool TimeLinearScan = false

ccstr TraceJVMTI =

intx TrackedInitializationLimit = 50

bool TrapBasedNullChecks = false

bool TrapBasedRangeChecks = false

intx TypeProfileArgsLimit = 2

uintx TypeProfileLevel = 111

intx TypeProfileMajorReceiverPercent = 90

intx TypeProfileParmsLimit = 2

intx TypeProfileWidth = 2

intx UnguardOnExecutionViolation = 0

bool UseAES = true

intx UseAVX = 2

bool UseAdaptiveGenerationSizePolicyAtMajorCollection = true

bool UseAdaptiveGenerationSizePolicyAtMinorCollection = true

bool UseAdaptiveNUMAChunkSizing = true

bool UseAdaptiveSizeDecayMajorGCCost = true

bool UseAdaptiveSizePolicy = true

bool UseAdaptiveSizePolicyFootprintGoal = true

bool UseAdaptiveSizePolicyWithSystemGC = false

bool UseAddressNop = true

bool UseBASE64Intrinsics = false

bool UseBMI1Instructions = true

bool UseBMI2Instructions = true

bool UseBiasedLocking = false

bool UseBimorphicInlining = true

bool UseCLMUL = true

bool UseCMoveUnconditionally = false

bool UseCodeAging = true

bool UseCodeCacheFlushing = true

bool UseCompiler = true

bool UseCompressedClassPointers = true {

bool UseCompressedOops = true {

bool UseCondCardMark = false

bool UseCountLeadingZerosInstruction = true

bool UseCountTrailingZerosInstruction = true

bool UseCountedLoopSafepoints = true

bool UseCounterDecay = true

bool UseDivMod = true

bool UseDynamicNumberOfCompilerThreads = true

bool UseDynamicNumberOfGCThreads = true

bool UseEmptySlotsInSupers = true

bool UseFMA = true

bool UseFPUForSpilling = true

bool UseFastJNIAccessors = true

bool UseFastStosb = false

bool UseG1GC = true

bool UseGCOverheadLimit = true

bool UseHeavyMonitors = false

bool UseInlineCaches = true

bool UseInterpreter = true

bool UseJumpTables = true

bool UseLargePages = false

bool UseLargePagesIndividualAllocation = false

bool UseLoopCounter = true

bool UseLoopInvariantCodeMotion = true

bool UseLoopPredicate = true

bool UseMaximumCompactionOnSystemGC = true

bool UseNUMA = false

bool UseNUMAInterleaving = false

bool UseNewLongLShift = true

bool UseNotificationThread = true

bool UseOSErrorReporting = false

bool UseOnStackReplacement = true

bool UseOnlyInlinedBimorphic = true

bool UseOptoBiasInlining = false

bool UsePSAdaptiveSurvivorSizePolicy = true

bool UseParallelGC = false

bool UsePerfData = true

bool UsePopCountInstruction = true

bool UseProfiledLoopPredicate = true

bool UseRTMDeopt = false

bool UseRTMLocking = false

bool UseSHA = true

intx UseSSE = 4

bool UseSSE42Intrinsics = true

bool UseSerialGC = false

bool UseSharedSpaces = true

bool UseShenandoahGC = false

bool UseSignalChaining = true

bool UseStoreImmI16 = true

bool UseStringDeduplication = false

bool UseSubwordForMaxVector = true

bool UseSuperWord = true

bool UseTLAB = true

bool UseThreadPriorities = true

bool UseTypeProfile = true

bool UseTypeSpeculation = true

bool UseUnalignedLoadStores = true

bool UseVectorCmov = false

bool UseXMMForArrayCopy = true

bool UseXMMForObjInit = true

bool UseXmmI2D = true

bool UseXmmI2F = true

bool UseXmmLoadAndClearUpper = true

bool UseXmmRegToRegMoveAll = true

bool UseZGC = false

intx VMThreadPriority = -1

intx VMThreadStackSize = 0

intx ValueMapInitialSize = 11

intx ValueMapMaxLoopSize = 8

intx ValueSearchLimit = 1000

bool VerifySharedSpaces = false

uintx YoungGenerationSizeIncrement = 20

uintx YoungGenerationSizeSupplement = 80

uintx YoungGenerationSizeSupplementDecay = 8

size_t YoungPLABSize = 4096

double ZAllocationSpikeTolerance = 2.000000

double ZCollectionInterval = 0.000000

double ZFragmentationLimit = 25.000000

size_t ZMarkStackSpaceLimit = 8589934592

bool ZProactive = true

bool ZUncommit = true

uintx ZUncommitDelay = 300

bool ZeroTLAB = false

openjdk version "17.0.6" 2023-01-17

OpenJDK Runtime Environment Temurin-17.0.6+10 (build 17.0.6+10)

OpenJDK 64-Bit Server VM Temurin-17.0.6+10 (build 17.0.6+10, mixed mode, sharing)

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