查看tomcat项目中,具体占用cpu高的线程。

1、查看主进程占用cpu高:

此处主进程:27823
[root@storage-02 ~]# top
top - 1:02:33 up 2 days,  1:54,  3 users,  load average: 13.12, 13.31, 13.23
Tasks: 180 total,   3 running, 177 sleeping,   0 stopped,   0 zombie
%Cpu(s):100.0 us,  0.0 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  8002908 total,   582432 free,  3442856 used,  3977620 buff/cache
KiB Swap:  8388604 total,  8388604 free,        0 used.  3802688 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
27823 root      20   0 7041832 1.527g  13328 S 783.3 20.0  14494:52 java
21735 root      20   0  157720   2272   1552 R  16.7  0.0   0:00.01 top
    1 root      20   0  190988   4012   2416 S   0.0  0.1  48:29.91 systemd
    2 root      20   0       0      0      0 S   0.0  0.0   0:03.18 kthreadd
    3 root      20   0       0      0      0 S   0.0  0.0   0:31.90 ksoftirqd/0 

 

2、按照线程占用cpu由高到低进行排查:

通过主进程查看所有的线程,此处只列出了一部分线程TID为线程号,THREAD为线程的各项内容

[root@storage-02 ~]# ps -mp 27823 -o THREAD,tid,time | sort -rn |head -6
USER     %CPU PRI SCNT WCHAN  USER SYSTEM   TID     TIME
storage+ 38.3  19    - -         -      - 28296 2-22:05:22
storage+ 38.3  19    - -         -      - 28273 2-22:07:21
storage+ 38.3  19    - -         -      - 28241 2-22:10:49
storage+  132   -    - -         -      -     - 10-01:55:19
storage+ 12.1  19    - futex_    -      - 28212 22:15:30

找到线程占用高的线程id (tid) 例如:28296 28273 28241 各占用30%多

将线程号转化为16进制:

[root@zz-p-storagesdk-api01 ~]# printf "%x\n" 28296
6e88
[root@storage-02 service]# printf "%x\n" 28273
6e71
[root@storage-02 service]# printf "%x\n" 28241
6e51

 

通过主进程好搜索所有的线程执行的内容,

注意:必须使用项目运行的用户,以及使用的jdk版本下的jstack去查看

[root@zz-p-storagesdk-api01 ~]# sudo -u root /usr/local/jdk1.8/bin/jstack 27823 |grep 6e88 -A 30

[root@zz-p-storagesdk-api01 ~]# sudo -u root /usr/local/jdk1.8/bin/jstack 27823 |grep 6e71 -A 30

[root@zz-p-storagesdk-api01 ~]# sudo -u root /usr/local/jdk1.8/bin/jstack 27823 |grep 6e51 -A 30

 

转载于:https://www.cnblogs.com/huangyanqi/p/10550306.html

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