JVM性能优化指南
JVM常用命令
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jps
The jps command lists the instrumented Java HotSpot VMs on the target system. The command is limited to reporting information on JVMs for which it has the access permissions.
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jinfo
The jinfo command prints Java configuration information for a specified Java process or core file or a remote debug server. The configuration information includes Java system properties and Java Virtual Machine (JVM) command-line flags.
jinfo -flag MaxHeapSize PID jinfo -flag UseG1GC PID
jinfo -flag [+|-] PID jinfo -flag <name>=<value> PID
jinfo -flags PID
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jstat
The jstat command displays performance statistics for an instrumented Java HotSpot VM. The target JVM is identified by its virtual machine identifier, or vmid option.
jstat -class PID 1000 10 查看某个java进程的类装载信息，每1000毫秒输出一次，共输出10次
jstat -gc PID 1000 10
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jstack
The jstack command prints Java stack traces of Java threads for a specified Java process, core file, or remote debug server.
jstack PID
知识来源：马士兵教育