linux 怎么看进程的线程数

root@localhost:~# pstree --help

pstree: unrecognized option '--help'

Usage: pstree [ -a ] [ -c ] [ -h | -H PID ] [ -l ] [ -n ] [ -p ] [ -g ] [ -u ]

[ -A | -G | -U ] [ PID | USER ]

pstree -V

Display a tree of processes

-a, --arguments show command line arguments

-A, --ascii use ASCII line drawing characters

-c, --compact don't compact identical subtrees

-h, --highlight-all highlight current process and its ancestors

-H PID,

--highlight-pid=PID highlight this process and its ancestors

-g, --show-pgids show process group ids; implies -c

-G, --vt100 use VT100 line drawing characters

-l, --long don't truncate long lines

-n, --numeric-sort sort output by PID

-p, --show-pids show PIDs; implies -c

-s, --show-parents show parents of the selected process

-u, --uid-changes show uid transitions

-U, --unicode use UTF-8 (Unicode) line drawing characters

-V, --version display version information

PID start at this PID; default is 1 (init)

USER show only trees rooted at processes of this user

-p, --show-pids show PIDs; implies -c

-p 接进程pid，就可以显示子进程

root@localhost:~# pstree -p 1464

php5-fpm(1464)─┬─php5-fpm(1467)

├─php5-fpm(1468)

├─php5-fpm(1469)

├─php5-fpm(1470)

├─php5-fpm(1471)

├─php5-fpm(1472)

├─php5-fpm(1473)

├─php5-fpm(1474)

├─php5-fpm(1475)

├─php5-fpm(1476)

├─php5-fpm(4377)

├─php5-fpm(7805)

├─php5-fpm(8290)

└─php5-fpm(22279)

1、 cat /proc/${pid}/status 2、pstree -p ${pid} 3、top -p ${pid} 再按H 或者直接输入 top -bH -d 3 -p ${pid} top -H 手册中说：-H : Threads toggle 加上这个选项启动top，top一行显示一个线程。

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