Linux下查看进程、线程

ps -ef f
用树形显示进程和线程
在Linux下面好像因为没有真正的线程，是用进程模拟的，有一个是辅助线程，所以真正程序开的线程应该只有一个。
ps -ef f |grep httpd
[root@apache dhj]# ps -ef f|grep httpd
root      3756     1  0 Jun09 ?        Ss     0:38 /usr/local/apache22/bin/httpd -k start
apache    2146  3756  0 Jun18 ?        S      0:00  \_ /usr/local/apache22/bin/httpd -k start
apache    2029  3756  0 15:19 ?        Sl     0:06  \_ /usr/local/apache22/bin/httpd -k start
apache    4320  3756  0 15:24 ?        Sl     0:01  \_ /usr/local/apache22/bin/httpd -k start
apache    4387  3756  0 15:25 ?        Sl     0:01  \_ /usr/local/apache22/bin/httpd -k start
apache    5124  3756  0 15:27 ?        Sl     0:01  \_ /usr/local/apache22/bin/httpd -k start
apache    5462  3756  1 15:29 ?        Sl     0:04  \_ /usr/local/apache22/bin/httpd -k start
apache    5596  3756  1 15:29 ?        Sl     0:03  \_ /usr/local/apache22/bin/httpd -k start
apache    6293  3756  1 15:31 ?        Sl     0:00  \_ /usr/local/apache22/bin/httpd -k start
apache    6628  3756  2 15:32 ?        Sl     0:00  \_ /usr/local/apache22/bin/httpd -k start
apache    6695  3756  1 15:32 ?        Sl     0:00  \_ /usr/local/apache22/bin/httpd -k start
root      6763 28180  0 15:33 pts/1    S+     0:00                      \_ grep
httpd

[root@apache dhj]# ps axm|grep httpd
 3756 ?        -      0:38 /usr/local/apache22/bin/httpd -k start
 2146 ?        -      0:00 /usr/local/apache22/bin/httpd -k start
 2029 ?        -      0:06 /usr/local/apache22/bin/httpd -k start
 5124 ?        -      0:01 /usr/local/apache22/bin/httpd -k start
 5462 ?        -      0:08 /usr/local/apache22/bin/httpd -k start
 5596 ?        -      0:06 /usr/local/apache22/bin/httpd -k start
 6293 ?        -      0:00 /usr/local/apache22/bin/httpd -k start
 7503 ?        -      0:01 /usr/local/apache22/bin/httpd -k start
 7639 ?        -      0:01 /usr/local/apache22/bin/httpd -k start
 7908 ?        -      0:00 /usr/local/apache22/bin/httpd -k start
 7976 pts/1    -      0:00 grep httpd

另外用pstree -c也可以达到相同的效果，但是没有线程号：
[root@apache dhj]# pstree -c|grep httpd
     |-httpd-+-cronolog
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       `-httpd
[root@apache dhj]# pstree|grep httpd
     |-httpd-+-4*[cronolog]
     |       `-10*[httpd]