java进程CPU过高问题定位
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2022-07-13 09:03:06
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1、top命令查看过高CPU的pid,命令:top
[root@test-v3 bin]# top top - 16:44:22 up 173 days, 7:05, 2 users, load average: 0.74, 0.71, 0.61 Tasks: 150 total, 1 running, 149 sleeping, 0 stopped, 0 zombie Cpu(s): 0.8%us, 0.4%sy, 0.0%ni, 98.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.7%st Mem: 8061116k total, 7924856k used, 136260k free, 234996k buffers Swap: 4194300k total, 383972k used, 3810328k free, 1191756k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 949 root 20 0 3576m 622m 9852 S 3.3 7.9 1194:48 java 5485 root 20 0 3327m 688m 9804 S 3.3 8.8 1769:07 java 980 root 20 0 3460m 692m 10m S 3.0 8.8 1834:53 java 1012 root 20 0 3393m 668m 10m S 3.0 8.5 1824:38 java 14017 root 20 0 2841m 393m 9564 S 2.7 5.0 2079:06 java 1042 root 20 0 3522m 725m 9m S 0.7 9.2 366:09.83 java
2、定位线程,命令:ps -mp pid -o THREAD,tid,time | sort -rn
[root@test-v3 bin]# ps -mp 949 -o THREAD,tid,time | sort -rn USER %CPU PRI SCNT WCHAN USER SYSTEM TID TIME root 3.2 19 - futex_ - - 31587 13:37:04 root 2.5 - - - - - - 19:55:11 root 0.1 19 - futex_ - - 1849 01:14:46
3、将线程ID转为 16进制格式,命令:printf "%x\n" tid
[root@test-v3 bin]# printf "%x\n" 31587 7b63
4、打印堆栈信息 ,命令:jstack pid |grep 十六进制格式tid -A 10
其中-A 10表示查找到所在行的后10行。
[root@test-v3 bin]# cd /usr/java/jdk1.7.0_80/bin [root@test-v3 bin]# ./jstack 949 |grep 7b63 -A 30 "System Clock" daemon prio=10 tid=0x00007f42904b0800 nid=0x7b63 runnable [0x00007f41f6084000] java.lang.Thread.State: TIMED_WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000000eca553a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1090) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) "http-bio-8084-exec-10" daemon prio=10 tid=0x00007f422c011000 nid=0x210 waiting on condition [0x00007f41f6684000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000000ec542870> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:104) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:32) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) "http-bio-8084-exec-9" daemon prio=10 tid=0x00007f422c00f800 nid=0x7229 waiting on condition [0x00007f41f6785000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)
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