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1. jps或top 获取java的进程id
2. top -H -p java进程id ,可以看到各个线程占用的CPU时间
3. 找出占用CPU时间最高的线程PID, python -c "print hex(线程PID)" ,获取线程ID的16进制表示
4. jstack java进程id | less 根据16进制的线程ID查找具体线程的执行情况
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