哪个JVM标志设置了G1Ergonomics日志中提到的GC开销阈值？ [英] Which JVM Flag sets the GC overhead threshold mentioned in the G1Ergonomics log?
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问题描述
我正在使用G1垃圾收集器。
您可以启用自适应大小策略日志，其中包含
-XX： + PrintAdaptiveSizePolicy
以下是GC日志中的示例输出
1822.780：[G1人体工程学（堆大小）尝试堆扩展，原因：在GC，最近的GC开销后，最近的GC开销高于阈值：
11.48％，阈值：10.00％，未提交：0字节，计算的扩展量：0字节（20.00％）]
哪个JVM标志管理阈值：10.00％ 在那里提到？
下面是一些似乎相关的标志，但我尝试为其中的一些设置不同的值，日志消息没有改变。
$ b
user @ host：/ home / logs / cassandra $ java -XX：+ UnlockDiagnosticVMOptions -XX ：+ PrintFlagsFinal -version | egrepThreshold | Percent | Ratio
intx BackEdgeThreshold = 100000 {pd product}
intx BiasedLockingBulkRebiasThreshold = 20 {product}
intx BiasedLockingBulkRevokeThreshold = 40 {product}
intx BlockLayoutMinDiamondPercentage = 20 {C2 product}
uintx CMSIsTooFullPercentage = 98 {product}
double CMSLargeCoalSurplusPercent = 0.950000 {product}
double CMSLargeSplitSurplusPercent = 1.000000 {product}
uintx CMSPrecleanThreshold = 1000 {product}
uintx CMSScheduleRemarkEdenSizeThreshold = 2097152 {product}
uintx C MSScheduleRemarkSamplingRatio = 5 {product}
double CMSSmallCoalSurplusPercent = 1.050000 {product}
double CMSSmallSplitSurplusPercent = 1.100000 {product}
uintx CMSTriggerRatio = 80 {product}
uintx CMSWorkQueueDrainThreshold = 10 {product}
uintx CMS_SweepTimerThresholdMillis = 10 {product}
intx CompileThreshold = 10000 {pd product}
intx G1ConcRefinementThresholdStep = 0 {product}
uintx G1ConfidencePercent = 50 {product}
uintx G1HeapWastePercent = 5 {product}
intx G1RSetUpdatingPauseTimePercent = 10 {product}
uintx G1ReservePercent = 10 {product}
uintx G1SATBBufferEnqueueingThresholdPercent = 60 {product}
uintx GCLockerEdenExpansionPercent = 5 {product}
uintx GCTimeRatio = 99 {product}
uintx IncreaseFirstTierCompileThresholdAt = 50 {product}
uintx InitialSurvivorRatio = 8 {product}
uintx InitialTenuringThreshold = 7 {product}
uintx InitiatingHeapOccupancyPercent = 45 {产品}
intx Int erpreterProfilePercentage = 33 {product}
uintx LargePageHeapSizeThreshold = 134217728 {product}
uintx MarkSweepDeadRatio = 1 {product}
uintx MaxHeapFreeRatio = 100 {manageable}
uintx MaxMetaspaceFreeRatio = 70 {product}
uintx MaxTenuringThreshold = 15 {product}
uintx MinHeapFreeRatio = 0 {manageable}
intx MinInliningThreshold = 250 {product}
uintx MinMetaspaceFreeRatio = 40 {product}
uintx MinSurvivorRatio = 3 {product}
uintx NewRatio = 2 {product}
intx OnStackReplacePercentage = 140 {pd product}
uintx PretenureSizeThreshold = 0 {product}
intx ProfileMaturityPercentage = 20 {product}
uintx StringDeduplicationAgeThreshold = 3 {product}
uintx SurvivorRatio = 8 {product}
uintx TLABWasteTargetPercent = 1 {product}
uintx TargetSurvivorRatio = 50 {product}
uintx ThresholdTolerance = 10 {product}
intx Tier0ProfilingStartPercentage = 200 {product}
intx Tier2BackEdgeThreshold = 0 {product}
intx Tier2CompileThreshold = 0 {product}
intx Tier3BackEdgeThreshold = 60000 {product}
intx Tier3CompileThreshold = 2000 {product}
intx Tier3InvocationThreshold = 200 {product}
intx Tier3MinInvocationThreshold = 100 {product}
intx Tier4BackEdgeThreshold = 40000 {product}
intx Tier4CompileThreshold = 15000 {product}
intx Tier4InvocationThreshold = 5000 {product}
intx Tier4MinInvocationThreshold = 600 {product}
Java™SE运行时环境（内部版本）
intx TypeProfileMajorReceiverPercent = 90 {C2产品}
java版本1.8.0_72 1.8.0_72-b15）
Java HotSpot™64位服务器虚拟机（构建25.72-b15，混合模式）
解决方案
PringFlagsFinal 应该附加到您的实际命令行上，因为一些标志可能会影响其他标志的默认值。
驱动 GC人体工程学涵盖在官方文档，您应该在开始GC调整之前阅读它们。
I'm using the G1 garbage collector.
You can enable adaptive size policy logs with
-XX:+PrintAdaptiveSizePolicy
Here's sample output in the GC logs
1822.780: [G1Ergonomics (Heap Sizing) attempt heap expansion, reason: recent GC overhead higher than threshold after GC, recent GC overhead: 11.48 %, threshold: 10.00 %, uncommitted: 0 bytes, calculated expansion amount: 0 bytes (20.00 %)]
Which JVM flag manages the threshold: 10.00 % that is mentioned in there?
Below are some of the flags that seemed related, but I tried setting a different value for a few of them and the log message didn't change.
user@host:/home/logs/cassandra$ java -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version | egrep "Threshold|Percent|Ratio"
intx BackEdgeThreshold = 100000 {pd product}
intx BiasedLockingBulkRebiasThreshold = 20 {product}
intx BiasedLockingBulkRevokeThreshold = 40 {product}
intx BlockLayoutMinDiamondPercentage = 20 {C2 product}
uintx CMSIsTooFullPercentage = 98 {product}
double CMSLargeCoalSurplusPercent = 0.950000 {product}
double CMSLargeSplitSurplusPercent = 1.000000 {product}
uintx CMSPrecleanThreshold = 1000 {product}
uintx CMSScheduleRemarkEdenSizeThreshold = 2097152 {product}
uintx CMSScheduleRemarkSamplingRatio = 5 {product}
double CMSSmallCoalSurplusPercent = 1.050000 {product}
double CMSSmallSplitSurplusPercent = 1.100000 {product}
uintx CMSTriggerRatio = 80 {product}
uintx CMSWorkQueueDrainThreshold = 10 {product}
uintx CMS_SweepTimerThresholdMillis = 10 {product}
intx CompileThreshold = 10000 {pd product}
intx G1ConcRefinementThresholdStep = 0 {product}
uintx G1ConfidencePercent = 50 {product}
uintx G1HeapWastePercent = 5 {product}
intx G1RSetUpdatingPauseTimePercent = 10 {product}
uintx G1ReservePercent = 10 {product}
uintx G1SATBBufferEnqueueingThresholdPercent = 60 {product}
uintx GCLockerEdenExpansionPercent = 5 {product}
uintx GCTimeRatio = 99 {product}
uintx IncreaseFirstTierCompileThresholdAt = 50 {product}
uintx InitialSurvivorRatio = 8 {product}
uintx InitialTenuringThreshold = 7 {product}
uintx InitiatingHeapOccupancyPercent = 45 {product}
intx InterpreterProfilePercentage = 33 {product}
uintx LargePageHeapSizeThreshold = 134217728 {product}
uintx MarkSweepDeadRatio = 1 {product}
uintx MaxHeapFreeRatio = 100 {manageable}
uintx MaxMetaspaceFreeRatio = 70 {product}
uintx MaxTenuringThreshold = 15 {product}
uintx MinHeapFreeRatio = 0 {manageable}
intx MinInliningThreshold = 250 {product}
uintx MinMetaspaceFreeRatio = 40 {product}
uintx MinSurvivorRatio = 3 {product}
uintx NewRatio = 2 {product}
intx OnStackReplacePercentage = 140 {pd product}
uintx PretenureSizeThreshold = 0 {product}
intx ProfileMaturityPercentage = 20 {product}
uintx StringDeduplicationAgeThreshold = 3 {product}
uintx SurvivorRatio = 8 {product}
uintx TLABWasteTargetPercent = 1 {product}
uintx TargetSurvivorRatio = 50 {product}
uintx ThresholdTolerance = 10 {product}
intx Tier0ProfilingStartPercentage = 200 {product}
intx Tier2BackEdgeThreshold = 0 {product}
intx Tier2CompileThreshold = 0 {product}
intx Tier3BackEdgeThreshold = 60000 {product}
intx Tier3CompileThreshold = 2000 {product}
intx Tier3InvocationThreshold = 200 {product}
intx Tier3MinInvocationThreshold = 100 {product}
intx Tier4BackEdgeThreshold = 40000 {product}
intx Tier4CompileThreshold = 15000 {product}
intx Tier4InvocationThreshold = 5000 {product}
intx Tier4MinInvocationThreshold = 600 {product}
intx TypeProfileMajorReceiverPercent = 90 {C2 product}
java version "1.8.0_72"
Java(TM) SE Runtime Environment (build 1.8.0_72-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.72-b15, mixed mode)
解决方案
GCTimeRatio is the one you're looking for, it has a different default when you actually specify G1. In general PringFlagsFinal should be appended to your actual command line because some flags can influence the defaults of others.
What drives the GC ergonomics is covered in the official docs, you should read them before embarking on GC tuning.
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