JVM options for better compiler/compilation speed?

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Simon Ochsenreither

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Dec 20, 2012, 9:46:52 AM12/20/12

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Charles Nutter seems to have written some tool which combines JVM options, measures startup time of the JRuby console with it and figures out the best combination of options: https://gist.github.com/4343186

Would it make sense to try a similar approach to speed up scalac? Or did anyone already play with JVM options and discovered it wasn't worthwhile?
For example, in the talk at Intel Martin Odersky mentioned that one cause of the compilation slowness is caused by the issue that the JVM's JIT takes 2 minutes to arrive at an optimized state ... did someone try to set the appropriate JVM settings (e. g. -XX:CompileThreshold) to a lower value?

Thanks and bye,

Simon

Lukas Rytz

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Dec 20, 2012, 9:52:27 AM12/20/12

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On Thu, Dec 20, 2012 at 3:46 PM, Simon Ochsenreither <simon.och...@gmail.com> wrote:

Charles Nutter seems to have written some tool which combines JVM options, measures startup time of the JRuby console with it and figures out the best combination of options: https://gist.github.com/4343186

Would it make sense to try a similar approach to speed up scalac? Or did anyone already play with JVM options and discovered it wasn't worthwhile?

I played with memory options at some point with the following conclusions (not very surprising):

- put -Xmx high enough (1.5 gigs for compiling the compiler, higher values didn't help back then)

- put -Xms to the same value as -Xmx (so the jvm doesn't gc just to try to keep memory as low as possible)

- parallel gc (-XX:+UseParallelGC) helps a bit

Paul Phillips

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Dec 20, 2012, 10:05:31 AM12/20/12

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On Thu, Dec 20, 2012 at 6:46 AM, Simon Ochsenreither <simon.och...@gmail.com> wrote:

Would it make sense to try a similar approach to speed up scalac? Or did anyone already play with JVM options and discovered it wasn't worthwhile?

I've done it before, but not as exhaustively as the subject merits. (At the same time lukas did, actually.) There is a pretty enormous combination space of jvm options. I definitely think it's still a worthwhile thing to do, focusing on GC and JIT options.

The biggest dent you can make in compile times, last I checked, was -d32. (I don't remember if this was before compressed oops by default; if so then it may be much less pronounced now.)

[Global flags]

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uintx AdaptiveSizePolicyWeight = 10 {product}

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intx PerfDataSamplingInterval = 50 {product}

ccstr PerfDataSaveFile = {product}

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bool PostSpinYield = true {product}

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intx PreInflateSpin = 10 {pd product}

bool PreSpinYield = false {product}

bool PreferInterpreterNativeStubs = false {pd product}

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intx PrefetchFieldsAhead = 1 {product}

intx PrefetchScanIntervalInBytes = 576 {product}

bool PreserveAllAnnotations = false {product}

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uintx PretenureSizeThreshold = 0 {product}

bool PrintAdapterHandlers = false {diagnostic}

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ccstr PrintAssemblyOptions = {diagnostic}

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bool PrintClassHistogram = false {manageable}

bool PrintClassHistogramAfterFullGC = false {manageable}

bool PrintClassHistogramBeforeFullGC = false {manageable}

bool PrintCommandLineFlags = false {product}

bool PrintCompilation = false {product}

bool PrintCompilation2 = false {diagnostic}

bool PrintCompressedOopsMode = false {diagnostic}

bool PrintConcurrentLocks = false {manageable}

bool PrintDTraceDOF = false {diagnostic}

intx PrintFLSCensus = 0 {product}

intx PrintFLSStatistics = 0 {product}

bool PrintFlagsFinal := true {product}

bool PrintFlagsInitial = false {product}

bool PrintGC = false {manageable}

bool PrintGCApplicationConcurrentTime = false {product}

bool PrintGCApplicationStoppedTime = false {product}

bool PrintGCDateStamps = false {manageable}

bool PrintGCDetails = false {manageable}

bool PrintGCTaskTimeStamps = false {product}

bool PrintGCTimeStamps = false {manageable}

bool PrintHeapAtGC = false {product rw}

bool PrintHeapAtGCExtended = false {product rw}

bool PrintHeapAtSIGBREAK = true {product}

bool PrintInlining = false {diagnostic}

bool PrintInterpreter = false {diagnostic}

bool PrintIntrinsics = false {diagnostic}

bool PrintJNIGCStalls = false {product}

bool PrintJNIResolving = false {product}

bool PrintMethodHandleStubs = false {diagnostic}

bool PrintNMethods = false {diagnostic}

bool PrintNativeNMethods = false {diagnostic}

bool PrintOldPLAB = false {product}

bool PrintOopAddress = false {product}

bool PrintPLAB = false {product}

bool PrintParallelOldGCPhaseTimes = false {product}

bool PrintPreciseBiasedLockingStatistics = false {C2 diagnostic}

bool PrintPromotionFailure = false {product}

bool PrintReferenceGC = false {product}

bool PrintRevisitStats = false {product}

bool PrintSafepointStatistics = false {product}

intx PrintSafepointStatisticsCount = 300 {product}

intx PrintSafepointStatisticsTimeout = -1 {product}

bool PrintSharedSpaces = false {product}

bool PrintSignatureHandlers = false {diagnostic}

bool PrintStringTableStatistics = false {product}

bool PrintStubCode = false {diagnostic}

bool PrintTLAB = false {product}

bool PrintTenuringDistribution = false {product}

bool PrintTieredEvents = false {product}

bool PrintVMOptions = false {product}

bool PrintVMQWaitTime = false {product}

bool PrintWarnings = true {product}

uintx ProcessDistributionStride = 4 {product}

bool ProfileDynamicTypes = true {diagnostic}

bool ProfileInterpreter = true {pd product}

bool ProfileIntervals = false {product}

intx ProfileIntervalsTicks = 100 {product}

intx ProfileMaturityPercentage = 20 {product}

bool ProfileVM = false {product}

bool ProfilerPrintByteCodeStatistics = false {product}

bool ProfilerRecordPC = false {product}

uintx PromotedPadding = 3 {product}

intx QueuedAllocationWarningCount = 0 {product}

bool RangeCheckElimination = true {product}

bool RangeLimitCheck = true {C2 diagnostic}

intx ReadPrefetchInstr = 0 {product}

intx ReadSpinIterations = 100 {product}

bool ReassociateInvariants = true {C2 product}

bool ReduceBulkZeroing = true {C2 product}

bool ReduceFieldZeroing = true {C2 product}

bool ReduceInitialCardMarks = true {C2 product}

bool ReduceSignalUsage = false {product}

intx RefDiscoveryPolicy = 0 {product}

bool ReflectionWrapResolutionErrors = true {product}

bool RegisterFinalizersAtInit = true {product}

bool RelaxAccessControlCheck = false {product}

bool RequireSharedSpaces = false {product}

uintx ReservedCodeCacheSize = 50331648 {pd product}

bool ResizeOldPLAB = true {product}

bool ResizePLAB = true {product}

bool ResizeTLAB = true {pd product}

bool RestoreMXCSROnJNICalls = false {product}

bool RewriteBytecodes = true {pd product}

bool RewriteFrequentPairs = true {pd product}

intx SafepointPollOffset = 256 {C1 pd product}

intx SafepointSpinBeforeYield = 2000 {product}

bool SafepointTimeout = false {product}

intx SafepointTimeoutDelay = 10000 {product}

bool ScavengeBeforeFullGC = true {product}

intx ScavengeRootsInCode = 2 {diagnostic}

intx SelfDestructTimer = 0 {product}

bool SerializeVMOutput = true {diagnostic}

uintx SharedDummyBlockSize = 536870912 {product}

uintx SharedMiscCodeSize = 4194304 {product}

uintx SharedMiscDataSize = 6291456 {product}

bool SharedOptimizeColdStart = true {diagnostic}

uintx SharedReadOnlySize = 10485760 {product}

uintx SharedReadWriteSize = 14680064 {product}

bool SharedSkipVerify = false {diagnostic}

bool ShowMessageBoxOnError = false {product}

intx SoftRefLRUPolicyMSPerMB = 1000 {product}

bool SplitIfBlocks = true {product}

intx StackRedPages = 1 {pd product}

intx StackShadowPages = 20 {pd product}

bool StackTraceInThrowable = true {product}

intx StackYellowPages = 2 {pd product}

bool StartAttachListener = false {product}

intx StarvationMonitorInterval = 200 {product}

bool StressLdcRewrite = false {product}

bool StressTieredRuntime = false {product}

uintx StringTableSize = 1009 {product}

bool SuppressFatalErrorMessage = false {product}

uintx SurvivorPadding = 3 {product}

intx SurvivorRatio = 8 {product}

intx SuspendRetryCount = 50 {product}

intx SuspendRetryDelay = 5 {product}

intx SyncFlags = 0 {product}

ccstr SyncKnobs = {product}

intx SyncVerbose = 0 {product}

uintx TLABAllocationWeight = 35 {product}

uintx TLABRefillWasteFraction = 64 {product}

uintx TLABSize = 0 {product}

bool TLABStats = true {product}

uintx TLABWasteIncrement = 4 {product}

uintx TLABWasteTargetPercent = 1 {product}

intx TargetPLABWastePct = 10 {product}

intx TargetSurvivorRatio = 50 {product}

uintx TenuredGenerationSizeIncrement = 20 {product}

uintx TenuredGenerationSizeSupplement = 80 {product}

uintx TenuredGenerationSizeSupplementDecay = 2 {product}

intx ThreadPriorityPolicy = 0 {product}

bool ThreadPriorityVerbose = false {product}

uintx ThreadSafetyMargin = 52428800 {product}

intx ThreadStackSize = 1024 {pd product}

uintx ThresholdTolerance = 10 {product}

intx Tier0BackedgeNotifyFreqLog = 10 {product}

intx Tier0InvokeNotifyFreqLog = 7 {product}

intx Tier0ProfilingStartPercentage = 200 {product}

intx Tier1FreqInlineSize = 35 {C2 product}

intx Tier1Inline = 0 {C2 product}

intx Tier1LoopOptsCount = 0 {C2 product}

intx Tier1MaxInlineSize = 8 {C2 product}

intx Tier23InlineeNotifyFreqLog = 20 {product}

intx Tier2BackEdgeThreshold = 0 {product}

intx Tier2BackedgeNotifyFreqLog = 14 {product}

intx Tier2CompileThreshold = 0 {product}

intx Tier2InvokeNotifyFreqLog = 11 {product}

intx Tier3BackEdgeThreshold = 60000 {product}

intx Tier3BackedgeNotifyFreqLog = 13 {product}

intx Tier3CompileThreshold = 2000 {product}

intx Tier3DelayOff = 2 {product}

intx Tier3DelayOn = 5 {product}

intx Tier3InvocationThreshold = 200 {product}

intx Tier3InvokeNotifyFreqLog = 10 {product}

intx Tier3LoadFeedback = 5 {product}

intx Tier3MinInvocationThreshold = 100 {product}

intx Tier4BackEdgeThreshold = 40000 {product}

intx Tier4CompileThreshold = 15000 {product}

intx Tier4InvocationThreshold = 5000 {product}

intx Tier4LoadFeedback = 3 {product}

intx Tier4MinInvocationThreshold = 600 {product}

bool TieredCompilation = false {pd product}

intx TieredCompileTaskTimeout = 50 {product}

intx TieredRateUpdateMaxTime = 25 {product}

intx TieredRateUpdateMinTime = 1 {product}

intx TieredStopAtLevel = 4 {product}

bool TimeLinearScan = false {C1 product}

bool TraceBiasedLocking = false {product}

bool TraceClassLoading = false {product rw}

bool TraceClassLoadingPreorder = false {product}

bool TraceClassResolution = false {product}

bool TraceClassUnloading = false {product rw}

bool TraceCompileTriggered = false {diagnostic}

bool TraceDynamicGCThreads = false {product}

bool TraceGCTaskThread = false {diagnostic}

bool TraceGen0Time = false {product}

bool TraceGen1Time = false {product}

ccstr TraceJVMTI = {product}

bool TraceJVMTIObjectTagging = false {diagnostic}

bool TraceLoaderConstraints = false {product rw}

bool TraceMonitorInflation = false {product}

bool TraceNMethodInstalls = false {diagnostic}

bool TraceOSRBreakpoint = false {diagnostic}

bool TraceParallelOldGCTasks = false {product}

intx TraceRedefineClasses = 0 {product}

bool TraceRedundantCompiles = false {diagnostic}

bool TraceSafepointCleanupTime = false {product}

bool TraceSuperWord = false {C2 product}

bool TraceSuspendWaitFailures = false {product}

bool TraceTriggers = false {diagnostic}

intx TrackedInitializationLimit = 50 {C2 product}

bool TransmitErrorReport = false {product}

intx TypeProfileMajorReceiverPercent = 90 {product}

intx TypeProfileWidth = 2 {product}

intx UnguardOnExecutionViolation = 0 {product}

bool UnlinkSymbolsALot = false {product}

bool UnlockDiagnosticVMOptions := true {diagnostic}

bool UnrollLimitCheck = true {C2 diagnostic}

bool UnsyncloadClass = false {diagnostic}

bool Use486InstrsOnly = false {product}

intx UseAVX = 0 {product}

bool UseAdaptiveGCBoundary = false {product}

bool UseAdaptiveGenerationSizePolicyAtMajorCollection = true {product}

bool UseAdaptiveGenerationSizePolicyAtMinorCollection = true {product}

bool UseAdaptiveNUMAChunkSizing = true {product}

bool UseAdaptiveSizeDecayMajorGCCost = true {product}

bool UseAdaptiveSizePolicy = true {product}

bool UseAdaptiveSizePolicyFootprintGoal = true {product}

bool UseAdaptiveSizePolicyWithSystemGC = false {product}

bool UseAddressNop = true {product}

bool UseAltSigs = false {product}

bool UseAutoGCSelectPolicy = false {product}

bool UseBiasedLocking = true {product}

bool UseBimorphicInlining = true {C2 product}

bool UseBlockCopy = false {product}

bool UseBlockZeroing = false {product}

bool UseBoundThreads = true {product}

bool UseBsdPosixThreadCPUClocks = true {product}

bool UseCBCond = false {product}

bool UseCMSBestFit = true {product}

bool UseCMSCollectionPassing = true {product}

bool UseCMSCompactAtFullCollection = true {product}

bool UseCMSInitiatingOccupancyOnly = false {product}

bool UseCodeCacheFlushing = true {product}

bool UseCompiler = true {product}

bool UseCompilerSafepoints = true {product}

bool UseCompressedOops := true {lp64_product}

bool UseConcMarkSweepGC = false {product}

bool UseCondCardMark = false {product}

bool UseCountLeadingZerosInstruction = false {product}

bool UseCounterDecay = true {product}

bool UseDivMod = true {C2 product}

bool UseDynamicNumberOfGCThreads = false {product}

bool UseFPUForSpilling = false {C2 product}

bool UseFastAccessorMethods = false {product}

bool UseFastEmptyMethods = false {product}

bool UseFastJNIAccessors = true {product}

bool UseG1GC = false {product}

bool UseGCLogFileRotation = false {product}

bool UseGCOverheadLimit = true {product}

bool UseGCTaskAffinity = false {product}

bool UseHeavyMonitors = false {product}

bool UseHugeTLBFS = false {product}

bool UseIncDec = true {diagnostic}

bool UseInlineCaches = true {product}

bool UseInterpreter = true {product}

bool UseJumpTables = true {C2 product}

bool UseLWPSynchronization = true {product}

bool UseLargePages = false {pd product}

bool UseLargePagesIndividualAllocation = false {pd product}

bool UseLoopCounter = true {product}

bool UseLoopPredicate = true {C2 product}

bool UseMaximumCompactionOnSystemGC = true {product}

bool UseMembar = true {pd product}

bool UseNUMA = false {product}

bool UseNUMAInterleaving = false {product}

bool UseNewCode = false {diagnostic}

bool UseNewCode2 = false {diagnostic}

bool UseNewCode3 = false {diagnostic}

bool UseNewLongLShift = false {product}

bool UseNiagaraInstrs = false {product}

bool UseOSErrorReporting = false {pd product}

bool UseOldInlining = true {C2 product}

bool UseOnStackReplacement = true {pd product}

bool UseOnlyInlinedBimorphic = true {C2 product}

bool UseOprofile = false {product}

bool UseOptoBiasInlining = true {C2 product}

bool UsePPCLWSYNC = true {product}

bool UsePSAdaptiveSurvivorSizePolicy = true {product}

bool UseParNewGC = false {product}

bool UseParallelGC := true {product}

bool UseParallelOldGC = true {product}

bool UsePerfData = true {product}

bool UsePopCountInstruction = true {product}

bool UseRDPCForConstantTableBase = false {C2 product}

bool UseSHM = false {product}

intx UseSSE = 4 {product}

bool UseSSE42Intrinsics = true {product}

bool UseSerialGC = false {product}

bool UseSharedSpaces = false {product}

bool UseSignalChaining = true {product}

bool UseSpinning = false {product}

bool UseSplitVerifier = true {product}

bool UseStoreImmI16 = false {product}

bool UseStringCache = false {product}

bool UseSuperWord = true {C2 product}

bool UseTLAB = true {pd product}

bool UseThreadPriorities = true {pd product}

bool UseTypeProfile = true {product}

bool UseUnalignedLoadStores = false {product}

intx UseVIS = 99 {product}

bool UseVMInterruptibleIO = false {product}

bool UseVectoredExceptions = false {pd product}

bool UseXMMForArrayCopy = true {product}

bool UseXmmI2D = false {product}

bool UseXmmI2F = false {product}

bool UseXmmLoadAndClearUpper = true {product}

bool UseXmmRegToRegMoveAll = true {product}

bool VMThreadHintNoPreempt = false {product}

intx VMThreadPriority = -1 {product}

intx VMThreadStackSize = 1024 {pd product}

intx ValueMapInitialSize = 11 {C1 product}

intx ValueMapMaxLoopSize = 8 {C1 product}

intx ValueSearchLimit = 1000 {C2 product}

bool VerifyAfterGC = false {diagnostic}

bool VerifyBeforeExit = false {diagnostic}

bool VerifyBeforeGC = false {diagnostic}

bool VerifyBeforeIteration = false {diagnostic}

bool VerifyDuringGC = false {diagnostic}

intx VerifyGCLevel = 0 {diagnostic}

uintx VerifyGCStartAt = 0 {diagnostic}

bool VerifyMergedCPBytecodes = true {product}

bool VerifyMethodHandles = false {diagnostic}

bool VerifyObjectStartArray = true {diagnostic}

bool VerifyRememberedSets = false {diagnostic}

intx WorkAroundNPTLTimedWaitHang = 1 {product}

uintx YoungGenerationSizeIncrement = 20 {product}

uintx YoungGenerationSizeSupplement = 80 {product}

uintx YoungGenerationSizeSupplementDecay = 8 {product}

uintx YoungPLABSize = 4096 {product}

bool ZeroTLAB = false {product}

intx hashCode = 0 {product}

Simon Ochsenreither

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Dec 20, 2012, 10:06:17 AM12/20/12

to scala-i...@googlegroups.com

Hi Lukas,

I played with memory options at some point

Great! Knowing that it didnd't kelp (much) is also a valuable information. If the JIT compiler seems to be the bottleneck, we should really look at the JIT options next.

In general -XX:+AggressiveOpts, -XX:CompileThreshold, -XX:+UseFastAccessorMethods come to mind. Considering the compiler also works with a lot of text, -XX:+UseStringCache, -XX:+UseCompressedStrings and -XX:+OptimizeStringConcat could be interesting, too.
Interesting inlining options: -XX:InlineSmallCode, -XX:MaxInlineSize, -XX:FreqInlineSize and -XX:LoopUnrollLimit.

-XX:-PrintCompilation and -XX:+UnlockDiagnosticVMOptions wtih the appropriate PrintXXX opitons might help figuring out what the JIT does.

Bye,

Simon

Lukas Rytz

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Dec 20, 2012, 10:09:45 AM12/20/12

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On Thu, Dec 20, 2012 at 4:05 PM, Paul Phillips <pa...@improving.org> wrote:

On Thu, Dec 20, 2012 at 6:46 AM, Simon Ochsenreither <simon.och...@gmail.com> wrote:

Would it make sense to try a similar approach to speed up scalac? Or did anyone already play with JVM options and discovered it wasn't worthwhile?

I've done it before, but not as exhaustively as the subject merits. (At the same time lukas did, actually.) There is a pretty enormous combination space of jvm options. I definitely think it's still a worthwhile thing to do, focusing on GC and JIT options.

The biggest dent you can make in compile times, last I checked, was -d32.

right, for me (os x, jdk1.6) -d32 is also very helpful, much more than compressedOops

Paul Phillips

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Dec 20, 2012, 10:15:26 AM12/20/12

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On Thu, Dec 20, 2012 at 7:06 AM, Simon Ochsenreither <simon.och...@gmail.com> wrote:

XX:+UseStringCache, -XX:+UseCompressedStrings and -XX:+OptimizeStringConcat could be interesting, too.

I've tried all these, negligible if any result.

Interesting inlining options: -XX:InlineSmallCode, -XX:MaxInlineSize, -XX:FreqInlineSize and -XX:LoopUnrollLimit.

These you can have an impact with.

-XX:-PrintCompilation and -XX:+UnlockDiagnosticVMOptions wtih the appropriate PrintXXX opitons might help figuring out what the JIT does.

Since you're interested, here's something I was working on 4 months ago I never made it back to.

https://github.com/paulp/log-compilation

Actually I abandoned that one to take a more principled approach translating xml to data objects, but that one is an even less publishable state.

Erik Rozendaal

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Dec 20, 2012, 10:32:14 AM12/20/12

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What helped a lot for me with JDK7 on Mac OS X using maven (before Zinc arrived) was -XX:+TieredCompilation -XX:CICompilerCount=1. This could cut compile time by 30-50% (since the maven build forks a new scala compiler for each compile step).

Using -XX:+UseParallelGC also helped a little bit.

Using the new maven plugin zinc support is faster still, after the compiler warms up.

Regards,

Erik

Paul Phillips

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Dec 20, 2012, 10:48:43 AM12/20/12

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On Thu, Dec 20, 2012 at 7:32 AM, Erik Rozendaal <er...@deler.org> wrote:

What helped a lot for me with JDK7 on Mac OS X using maven (before Zinc arrived) was -XX:+TieredCompilation -XX:CICompilerCount=1. This could cut compile time by 30-50% (since the maven build forks a new scala compiler for each compile step).

Oh yeah, I forgot to mention my standard ant options.

ANT_OPTS="-Xmx3g -Xms3g -XX:+TieredCompilation -XX:ReservedCodeCacheSize=256m -XX:MaxPermSize=384m -XX:+UseNUMA -XX:+UseParallelGC"

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