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查看当前JVM的 Perf Counter信息
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`perfcounter -h`{{execute T2}}
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```bash
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USAGE:
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perfcounter [-d] [-h]
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SUMMARY:
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Display the perf counter information.
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Examples:
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perfcounter
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perfcounter -d
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WIKI:
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https://arthas.aliyun.com/doc/perfcounter
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OPTIONS:
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-d, --details print all perf counter details
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-h, --help this help
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```
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## 使用参考
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`perfcounter`{{execute T2}}
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```bash
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$ perfcounter
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java.ci.totalTime 2325637411
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java.cls.loadedClasses 3403
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java.cls.sharedLoadedClasses 0
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java.cls.sharedUnloadedClasses 0
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java.cls.unloadedClasses 0
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java.property.java.version 11.0.4
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java.property.java.vm.info mixed mode
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java.property.java.vm.name OpenJDK 64-Bit Server VM
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```
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可以用-d参数打印更多信息：
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`perfcounter -d`{{execute T2}}
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```bash
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$ perfcounter -d
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Name Variability Units Value
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---------------------------------------------------------------------------------
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java.ci.totalTime Monotonic Ticks 3242526906
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java.cls.loadedClasses Monotonic Events 3404
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java.cls.sharedLoadedClasses Monotonic Events 0
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java.cls.sharedUnloadedClasses Monotonic Events 0
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java.cls.unloadedClasses Monotonic Events 0
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```
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## 备注: 对于jdk9以上的应用
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如果没有打印出信息，应用在启动时，加下面的参数：
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`--add-opens java.base/jdk.internal.perf=ALL-UNNAMED --add-exports java.base/jdk.internal.perf=ALL-UNNAMED`
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