JMH中hs_gc探查器计数器的含义

我正在使用JMH基准测试工具和hs_gc hotspot profiler.

我遇到的问题是我不确定输出计数器值是什么意思,并且无法在网上找到参考.

有人能指出我的规范方向或解释这些价值观吗？

我在下面粘贴了一个示例输出:

HS(GC) | difference: {

sun.gc.collector.0.invocations=16,
sun.gc.collector.0.lastEntryTime=37106821,
sun.gc.collector.0.lastExitTime=37109336,
sun.gc.collector.0.time=1528884,

sun.gc.collector.1.invocations=6,
sun.gc.collector.1.lastEntryTime=34419368,
sun.gc.collector.1.lastExitTime=35532892,
sun.gc.collector.1.time=6721387,

sun.gc.generation.0.space.0.used=872712984,
sun.gc.generation.1.space.0.used=5721334504,
sun.gc.generation.2.space.0.used=4848,

sun.gc.policy.avgBaseFootprint=5312,

sun.gc.policy.avgMajorIntervalTime=-667,
sun.gc.policy.avgMajorPauseTime=-41,

sun.gc.policy.avgMinorIntervalTime=-557,
sun.gc.policy.avgMinorPauseTime=1,

sun.gc.policy.avgOldLive=88064,
sun.gc.policy.avgPromotedAvg=421184,
sun.gc.policy.avgPromotedDev=364832,
sun.gc.policy.avgPromotedPaddedAvg=1515648,
sun.gc.policy.avgSurvivedAvg=1056640,
sun.gc.policy.avgSurvivedDev=-189440,
sun.gc.policy.avgSurvivedPaddedAvg=488320,
sun.gc.policy.avgYoungLive=2708352,

sun.gc.policy.liveAtLastFullGc=5721334504,
sun.gc.policy.liveSpace=2801664,

sun.gc.policy.majorGcCost=5,
sun.gc.policy.majorPauseYoungSlope=-3,

sun.gc.policy.minorGcCost=2,
sun.gc.policy.minorPauseTime=3,
sun.gc.policy.minorPauseYoungSlope=1,

sun.gc.policy.mutatorCost=-7,

sun.gc.policy.oldEdenSize=11534336,
sun.gc.policy.promoted=4584928,
sun.gc.policy.survived=6194624,

sun.gc.tlab.alloc=12852845,
sun.gc.tlab.fills=-15,

sun.gc.tlab.gcWaste=-100979,
sun.gc.tlab.maxFills=-22,
sun.gc.tlab.maxGcWaste=-100859,
sun.gc.tlab.maxSlowAlloc=-5,
sun.gc.tlab.maxSlowWaste=8826,

sun.gc.tlab.slowAlloc=-5,
sun.gc.tlab.slowWaste=8849}

Oleg Estekhi.. 12

HotSpot中的可维护性:HotSpot Jvmstat性能计数器对此有以下警告:

计数器有结构的名称,例如sun.gc.generation.1.name,java.threads.live,java.cls.loadedClasses.这些计数器的名称和用于表示它们的数据结构被认为是HotSpot JVM的专用,未提交的接口.用户不应该依赖任何计数器名称,特别是那些以"java."以外的前缀开头的名称.

附加警告:下面的所有源代码链接都指向特定的hg.openjdk.java.net/jdk7u/jdk7u60分支和特定的文件修订版.链接本身应该永远有效,但随着JVM的发展,新文件版本可以使这篇文章中的信息过时.

第一个信息来源是jstat文档(jstat 8 unix docs,jstat 8 windows docs,jstat 7 docs).它为许多性能计数器提供了人类可读的尽管简短描述,例如:

FGC: Number of full GC events.

column {
  header "^FGC^"    /* Full Collections */
  data sun.gc.collector.1.invocations
  align center
  width 5
  scale raw
  format "0"
}