![name： “中村 和之”,
businessDescription: [
“R＆D (since 2016)”,
“技術支援”
“新人育成 (until 2015)”
],
twitterHandle: “@nakm”](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Similar to Jdk9で変更になる（かも知れない）jvmオプションの標準設定
Similar to Jdk9で変更になる（かも知れない）jvmオプションの標準設定 (20)
Jdk9で変更になる（かも知れない）jvmオプションの標準設定
- 1. JDK9で変更になる（かも知れない） JVMオプションの標準設定 Javaone 2016 報告会 @ Tokyo 懇親会LT 2016/10/15
- 2. name： “中村 和之”, businessDescription: [ “R＆D (since 2016)”, “技術支援” “新人育成 (until 2015)” ], twitterHandle: “@nakm”
- 4. JavaOneに初参加した感想 • コードが読めれば、大体なんとかなる • 聞くだけなら • 「聞く＋日本語変換＋メモ」の並列処理は結構辛い • 話すことは別 • @venkat博士のセッションだけは謎体験だった • 食文化は異文化コミュニケーション • 蟹はおいしい（発表者個人の見解です） • スーツを着るといたたまれない気持ちになる • 毎日まとめ書くのは体力が必要（最終日無理）
- 7. つらい
- 8. おれたちエンタープライズ • お客様の環境で動いているコードを正常に動かし続けることが重要 • バージョンアップだけでも一騒動 • 基本的にはソースコード改変せずに動かし続けたい • 影響調査範囲の明確化のため • 大体は互換性があるので、問題ないはず • Project JigsawによりReflectionでprivateを呼び出せなくなるかも問題は割愛
- 10. 調べてみよう
- 11. 前提 • OS: Windows 10 Pro • Mem: 16GB • JDK8 -version: java version "1.8.0_101" Java(TM) SE Runtime Environment (build 1.8.0_101-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode) • JDK9 -version: java version "9-ea" Java(TM) SE Runtime Environment (build 9-ea+138) Java HotSpot(TM) 64-Bit Server VM (build 9-ea+138, mixed mode)
- 14. ArrayAllocatorMallocLimit ConcGCThreads FastTLABRefill G1ConcRefinementThreads G1ConcRefinementThresholdStep G1HeapRegionSize G1RSetRegionEntries G1RSetSparseRegionEntries GCPauseIntervalMillis GCTimeRatio MarkStackSizeMax MarkSweepDeadRatio MaxGCMinorPauseMillis MaxGCPauseMillis MaxHeapFreeRatio MaxNodeLimit MaxRAM MaxVectorSize MinHeapDeltaBytes MinHeapFreeRatio MonitorInUseLists ✔ NewSize OldSize ScavengeBeforeFullGC SharedBaseAddress SharedReadOnlySize SharedReadWriteSize StackShadowPages UseG1GC ✔ UseMontgomeryMultiplyIntrinsic ✔ UseMontgomerySquareIntrinsic ✔ UseMulAddIntrinsic ✔ UseParallelGC UseParallelOldGC UseSHA ✔ UseSHA256Intrinsics ✔ UseSquareToLenIntrinsic ✔ 有効化されたもの（JDK8:FALSE→JDK9:TRUE）✔ 8/37
- 15. ArrayAllocatorMallocLimit ConcGCThreads FastTLABRefill ✔ G1ConcRefinementThreads G1ConcRefinementThresholdStep G1HeapRegionSize G1RSetRegionEntries G1RSetSparseRegionEntries GCPauseIntervalMillis GCTimeRatio MarkStackSizeMax MarkSweepDeadRatio MaxGCMinorPauseMillis MaxGCPauseMillis MaxHeapFreeRatio MaxNodeLimit MaxRAM MaxVectorSize MinHeapDeltaBytes MinHeapFreeRatio MonitorInUseLists NewSize OldSize ScavengeBeforeFullGC ✔ SharedBaseAddress SharedReadOnlySize SharedReadWriteSize StackShadowPages UseG1GC UseMontgomeryMultiplyIntrinsic UseMontgomerySquareIntrinsic UseMulAddIntrinsic UseParallelGC ✔ UseParallelOldGC ✔ UseSHA UseSHA256Intrinsics UseSquareToLenIntrinsic 無効化されたもの（JDK8:TRUE→JDK9:FALSE）✔ 4/37
- 17. ArrayAllocatorMallocLimit ✔ ConcGCThreads ✔ FastTLABRefill G1ConcRefinementThreads ✔ G1ConcRefinementThresholdStep ✔ G1HeapRegionSize ✔ G1RSetRegionEntries ✔ G1RSetSparseRegionEntries ✔ GCPauseIntervalMillis ✔ GCTimeRatio MarkStackSizeMax MarkSweepDeadRatio ✔ MaxGCMinorPauseMillis ✔ MaxGCPauseMillis MaxHeapFreeRatio MaxNodeLimit ✔ MaxRAM ✔ MaxVectorSize ✔ MinHeapDeltaBytes ✔ MinHeapFreeRatio ✔ MonitorInUseLists NewSize OldSize ScavengeBeforeFullGC SharedBaseAddress ✔ SharedReadOnlySize SharedReadWriteSize StackShadowPages ✔ UseG1GC UseMontgomeryMultiplyIntrinsic UseMontgomerySquareIntrinsic UseMulAddIntrinsic UseParallelGC UseParallelOldGC UseSHA UseSHA256Intrinsics UseSquareToLenIntrinsic 値が増加したもの（JDK8:VALUE < JDK9:VALUE）✔ 17/37
- 18. VARIABLE JDK8 JDK9 RATIO ArrayAllocatorMallocLimit 4,294,967,295 18,446,744,073,709,500,000 429496729700% ConcGCThreads 0 1 G1ConcRefinementThreads 0 4 G1ConcRefinementThresholdStep 0 2 G1HeapRegionSize 0 1,048,576 G1RSetRegionEntries 0 256 G1RSetSparseRegionEntries 0 4 GCPauseIntervalMillis 0 201 MarkSweepDeadRatio 1 5 500% MaxGCMinorPauseMillis 4,294,967,295 18,446,744,073,709,500,000 429496729700% MaxNodeLimit 75,000 80,000 107% MaxRAM 0 137,438,953,472 MaxVectorSize 32 64 200% MinHeapDeltaBytes 524,288 1,048,576 200% MinHeapFreeRatio 0 40 SharedBaseAddress 0 34,359,738,368 StackShadowPages 6 7 117%
- 19. ArrayAllocatorMallocLimit ConcGCThreads FastTLABRefill G1ConcRefinementThreads G1ConcRefinementThresholdStep G1HeapRegionSize G1RSetRegionEntries G1RSetSparseRegionEntries GCPauseIntervalMillis GCTimeRatio ✔ MarkStackSizeMax ✔ MarkSweepDeadRatio MaxGCMinorPauseMillis MaxGCPauseMillis ✔ MaxHeapFreeRatio ✔ MaxNodeLimit MaxRAM MaxVectorSize MinHeapDeltaBytes MinHeapFreeRatio MonitorInUseLists NewSize ✔ OldSize ✔ ScavengeBeforeFullGC SharedBaseAddress SharedReadOnlySize ✔ SharedReadWriteSize ✔ StackShadowPages UseG1GC UseMontgomeryMultiplyIntrinsic UseMontgomerySquareIntrinsic UseMulAddIntrinsic UseParallelGC UseParallelOldGC UseSHA UseSHA256Intrinsics UseSquareToLenIntrinsic 値が減少したもの（JDK8:VALUE > JDK9:VALUE）✔ 8/37
- 20. VARIABLE JDK8 JDK9 RATIO GCTimeRatio 99 12 12.1% MarkStackSizeMax 536,870,912 16,777,216 3.1% MaxGCPauseMillis 4,294,967,295 200 0.0% MaxHeapFreeRatio 100 70 70.0% NewSize 88,604,672 1,363,144 1.5% OldSize 177,733,632 5,452,592 3.1% SharedReadOnlySize 16,777,216 10,485,760 62.5% SharedReadWriteSize 16,777,216 10,485,760 62.5%
- 21. まとめ • G1GCの設定値周りは自動で設定されている • G1GC一旦試してみるには良い状況 • JDK8リリース以降導入されたDiagnostics系の設定値が有効化されている • で、コレ一つ一つがどういう影響をアプリケーションにもたらすの？ • こまけぇことはいいんだよ（すみません、存じ上げません）
- 22. 参考情報 • compare JVM options for public • https://docs.google.com/spreadsheets/d/1W2enGLRz0t7PQ75nZn2QGZb- dyOrsjNflMNQZUyc5Tg/edit#gid=583591202 • 見せてやろうJVMが持つ真のチカラを！ JVMのオプションを一覧する方法について。 • http://qiita.com/taichi@github/items/7d2bb7d4af7fec8530c3
- 23. 以上
- 24. ArrayAllocatorMallocLimit✔ ConcGCThreads ✔ FastTLABRefill G1ConcRefinementThreads ✔ G1ConcRefinementThresholdStep ✔ G1HeapRegionSize ✔ G1RSetRegionEntries G1RSetSparseRegionEntries GCPauseIntervalMillis GCTimeRatio MarkStackSizeMax ✔ MarkSweepDeadRatio MaxGCMinorPauseMillis MaxGCPauseMillis MaxHeapFreeRatio MaxNodeLimit MaxRAM MaxVectorSize MinHeapDeltaBytes ✔ MinHeapFreeRatio MonitorInUseLists NewSize ✔ OldSize ✔ ScavengeBeforeFullGC SharedBaseAddress ✔ SharedReadOnlySize ✔ SharedReadWriteSize ✔ StackShadowPages UseG1GC UseMontgomeryMultiplyIntrinsic UseMontgomerySquareIntrinsic UseMulAddIntrinsic UseParallelGC UseParallelOldGC UseSHA UseSHA256Intrinsics UseSquareToLenIntrinsic 型が変わったもの(uintx,intx→size_t) ✔ 12/37
- 25. ArrayAllocatorMallocLimit ConcGCThreads ✔ FastTLABRefill G1ConcRefinementThreads ✔ G1ConcRefinementThresholdStep G1HeapRegionSize ✔ G1RSetRegionEntries G1RSetSparseRegionEntries GCPauseIntervalMillis GCTimeRatio MarkStackSizeMax MarkSweepDeadRatio MaxGCMinorPauseMillis MaxGCPauseMillis MaxHeapFreeRatio MaxNodeLimit MaxRAM MaxVectorSize MinHeapDeltaBytes ✔ MinHeapFreeRatio MonitorInUseLists NewSize ✔ OldSize ✔ ScavengeBeforeFullGC SharedBaseAddress SharedReadOnlySize SharedReadWriteSize StackShadowPages UseG1GC ✔ UseMontgomeryMultiplyIntrinsic UseMontgomerySquareIntrinsic UseMulAddIntrinsic UseParallelGC ✔ UseParallelOldGC UseSHA UseSHA256Intrinsics UseSquareToLenIntrinsic 実行時に自動(ergonomic)設定されているもの✔ 8/37
- 27. AdaptiveSizePausePolicy G1TraceConcRefinement PrintGCDateStamps TraceDynamicGCThreads AdjustConcurrency G1TraceEagerReclaimHumongousObjects PrintGCID TraceGCTaskThread BackEdgeThreshold G1TraceStringSymbolTableScrubbing PrintGCTaskTimeStamps TraceGen0Time C1PatchInvokeDynamic G1UseConcMarkReferenceProcessing PrintGCTimeStamps TraceGen1Time CMSCompactWhenClearAllSoftRefs GCLogFileSize PrintHeapAtGC TraceLoaderConstraints CMSDumpAtPromotionFailure JNIDetachReleasesMonitors PrintHeapAtGCExtended TraceMetadataHumongousAllocation CMSFullGCsBeforeCompaction LazyBootClassLoader PrintJNIGCStalls TraceMonitorInflation CMSIncrementalDutyCycle LoopLimitCheck PrintOldPLAB TraceParallelOldGCTasks CMSIncrementalDutyCycleMin MallocVerifyInterval PrintOopAddress TraceRedefineClasses CMSIncrementalMode MallocVerifyStart PrintParallelOldGCPhaseTimes TraceSafepointCleanupTime CMSIncrementalOffset NmethodSweepCheckInterval PrintPLAB TraceSharedLookupCache CMSIncrementalPacing NmethodSweepFraction PrintPromotionFailure UnrollLimitCheck CMSParPromoteBlocksToClaim NumberOfGCLogFiles PrintReferenceGC Use486InstrsOnly CMSPrintEdenSurvivorChunks ParallelGCRetainPLAB PrintStringDeduplicationStatistics UseAltSigs CodeCacheMinimumFreeSpace ParallelGCVerbose PrintTenuringDistribution UseBoundThreads CollectGen0First PreInflateSpin PrintTLAB UseCMSCollectionPassing CreateMinidumpOnCrash PrintAdaptiveSizePolicy RangeLimitCheck UseCMSCompactAtFullCollection DefaultMaxRAMFraction PrintClassHistogramAfterFullGC ReadPrefetchInstr UseCompilerSafepoints DefaultThreadPriority PrintClassHistogramBeforeFullGC ReflectionWrapResolutionErrors UseFastAccessorMethods EnableInvokeDynamic PrintCMSInitiationStatistics SafepointPollOffset UseFastEmptyMethods EnableSharedLookupCache PrintCMSStatistics StarvationMonitorInterval UseGCLogFileRotation FenceInstruction PrintCompressedOopsMode ThreadSafetyMargin UseMemSetInBOT G1LogLevel PrintDTraceDOF TraceBiasedLocking UseOldInlining G1PrintHeapRegions PrintFLSCensus TraceClassLoading UseVMInterruptibleIO G1PrintRegionLivenessInfo PrintFLSStatistics TraceClassLoadingPreorder VerboseVerification G1SummarizeConcMark PrintGCApplicationConcurrentTime TraceClassPaths VerifySilently G1SummarizeRSetStats PrintGCApplicationStoppedTime TraceClassResolution WorkAroundNPTLTimedWaitHang PrintGCCause TraceClassUnloading