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perfcounter ​

查看JVM的Perf Counter，一些性能相关的计量值

命令选项 ​

命令选项描述
-d, --detail查看详情
-h, --help帮助

列描述说明 ​

列名说明
Name计量名称
Value计量值
Variability计量类型
Units计量单位

Variability ​

参考sun.management.counter.Variability

  • CONSTANT 常量值
  • MONOTONIC 单调值
  • VARIABLE 变量值

UNITS ​

参考sun.management.counter.Units

  • NONE 无
  • BYTES 字节数
  • TICKS 时间
  • EVENTS 事件次数
  • STRING 字符串
  • HERTZ 赫兹

Counter创建代码 ​

java
LongBuffer longBuffer =
    Perf.getPerf()
        .createLong("your_counter_name", Variability.VARIABLE.intValue(), Units.EVENTS.intValue(), 110L)
        .order(ByteOrder.nativeOrder())
        .asLongBuffer();
longBuffer.put(0, longBuffer.get(0) + 1);

示例 ​

bash
# 默认只列出名称和计量值
[arthas@10580]$ perfcounter
sun.ci.compilerThread.0.time        316
sun.ci.compilerThread.1.time        183
sun.ci.compilerThread.10.time       1274
sun.ci.compilerThread.11.time       1460
sun.ci.compilerThread.2.time        217
sun.ci.compilerThread.3.time        210
...
sun.rt._sync_SuccessfulSpins        0
sun.rt.interruptedBeforeIO          0
sun.rt.interruptedDuringIO          0
sun.rt.safepoints                   541
sun.rt.threadInterruptSignaled      0
# 列出计量详情
[arthas@10580]$ perfcounter  -d
java.ci.totalTime                 Monotonic   Ticks      34929572
sun.ci.compilerThread.0.time      Monotonic   Ticks      316
sun.ci.compilerThread.1.time      Monotonic   Ticks      183
sun.ci.compilerThread.10.time     Monotonic   Ticks      1274
sun.ci.compilerThread.11.time     Monotonic   Ticks      1460
sun.ci.compilerThread.2.time      Monotonic   Ticks      217
sun.ci.compilerThread.3.time      Monotonic   Ticks      210
...
sun.rt._sync_SuccessfulSpins      Monotonic   Events     0
sun.rt.interruptedBeforeIO        Monotonic   Events     0
sun.rt.interruptedDuringIO        Monotonic   Events     0
sun.rt.safepoints                 Monotonic   Events     541
sun.rt.threadInterruptSignaled    Monotonic   Events     0