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# perfcounter
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[`perfcounter` online tutorial](https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=command-perfcounter)
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::: tip
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Check the current JVM Perf Counter information.
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:::
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## Usage
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```
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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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```
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Print more information with the `-d` option:
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```
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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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## JVM above JDK9
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If the information is not printed, when the application starts, add the following parameters:
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```
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--add-opens java.base/jdk.internal.perf=ALL-UNNAMED --add-exports java.base/jdk.internal.perf=ALL-UNNAMED --add-opens java.management/sun.management.counter.perf=ALL-UNNAMED --add-opens java.management/sun.management.counter=ALL-UNNAMED
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```
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