java进程消耗cpu高分析
1、使用top命令找到消耗cpu高的进程
[zhaikaiyun@testhost ~]$ top
Tasks: 304 total, 1 running, 303 sleeping, 0 stopped, 0 zombie
%Cpu(s): 20.3 us, 25.0 sy, 0.0 ni, 52.4 id, 0.0 wa, 0.0 hi, 1.0 si, 1.2 st
KiB Mem : 32779460 total, 5207912 free, 22593888 used, 4977660 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 9642932 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
18401 zhaikaiyun 20 0 13.095g 4.118g 30300 S 194.4 13.2 87:58.19 java
19247 zhaikaiyun 20 0 13.048g 3.811g 30264 S 152.8 12.2 86:13.30 java
19056 zhaikaiyun 20 0 13.098g 3.963g 30292 S 135.9 12.7 86:41.30 java
18731 zhaikaiyun 20 0 13.092g 4.191g 30276 S 135.5 13.4 87:55.69 java
19328 zhaikaiyun 20 0 13.169g 4.246g 30288 S 128.6 13.6 86:40.14 java
2、根据进程pid查找消耗cpu的线程
[zhaikaiyun@testhost ~]$ ps -mp 19056 -o THREAD,tid,time | sort -rn| head -10
USER %CPU PRI SCNT WCHAN USER SYSTEM TID TIME
zhaikaiyun 89.1 19 - ? - - 20194 00:21:51
zhaikaiyun 4.2 19 - futex_ - - 19437 00:01:02
zhaikaiyun 3.9 19 - futex_ - - 19438 00:00:58
zhaikaiyun 3.3 19 - futex_ - - 19063 00:00:50
zhaikaiyun 2.0 19 - ep_pol - - 24441 00:00:28
zhaikaiyun 197 - - - - - - 00:49:16
zhaikaiyun 1.8 19 - futex_ - - 24651 00:00:24
zhaikaiyun 1.7 19 - futex_ - - 19065 00:00:25
zhaikaiyun 1.6 19 - futex_ - - 24976 00:00:22
[zhaikaiyun@testhost ~]$ ps -mp 19056 -o THREAD,tid,time | sort -rn| head -10
USER %CPU PRI SCNT WCHAN USER SYSTEM TID TIME
zhaikaiyun 89.1 19 - ? - - 20194 00:21:58
zhaikaiyun 4.1 19 - futex_ - - 19437 00:01:02
zhaikaiyun 3.9 19 - futex_ - - 19438 00:00:58
zhaikaiyun 3.3 19 - futex_ - - 19063 00:00:50
zhaikaiyun 2.0 19 - ep_pol - - 24441 00:00:28
zhaikaiyun 197 - - - - - - 00:49:29
zhaikaiyun 1.8 19 - futex_ - - 24651 00:00:25
zhaikaiyun 1.7 19 - futex_ - - 19065 00:00:25
zhaikaiyun 1.6 19 - futex_ - - 24976 00:00:22
[zhaikaiyun@testhost ~]$ ps -mp 19056 -o THREAD,tid,time | sort -rn| head -10
USER %CPU PRI SCNT WCHAN USER SYSTEM TID TIME
zhaikaiyun 89.2 19 - ? - - 20194 00:21:59
zhaikaiyun 4.1 19 - futex_ - - 19437 00:01:02
zhaikaiyun 3.9 19 - futex_ - - 19438 00:00:58
zhaikaiyun 3.3 19 - futex_ - - 19063 00:00:50
zhaikaiyun 2.0 19 - ep_pol - - 24441 00:00:28
zhaikaiyun 197 - - - - - - 00:49:31
zhaikaiyun 1.8 19 - futex_ - - 24651 00:00:25
zhaikaiyun 1.7 19 - futex_ - - 19065 00:00:25
zhaikaiyun 1.6 19 - futex_ - - 24976 00:00:22
3、线程ID转换为16进制格式
[zhaikaiyun@testhost ~]$ printf "%x\n" 20194
4ee2
4、通过jstack查看线程快照，找到具体线程堆栈进行分析
[zhaikaiyun@testhost ~]$ jstack -l 62 |grep 0x4ee2 -A 30
"consumer-0" daemon prio=10 tid=0x00007f379ce52800 nid=0x4ee2 runnable [0x00007f37734f2000]
java.lang.Thread.State: RUNNABLE
at java.lang.Thread.yield(Native Method)
at com.lmax.disruptor.YieldingWaitStrategy.applyWaitMethod(YieldingWaitStrategy.java:57)
at com.lmax.disruptor.YieldingWaitStrategy.waitFor(YieldingWaitStrategy.java:39)
at com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:56)
at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:128)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Locked ownable synchronizers:
- <0x000000071b207cb8> (a java.util.concurrent.ThreadPoolExecutor$Worker)