Linux下多线程查看工具(pstree、ps、pstack),linux命令之-pstree使用说明

1. pstree

pstree以树结构显示进程

[email protected].*:~# pstree
init─┬─NetworkManager
  ├─abrt-dump-oops
  ├─abrtd
  ├─atd
  ├─auditd───{auditd}
  ├─automount───4*[{automount}]
  ├─certmonger
  ├─crond
  ├─dbus-daemon
  ├─hald─┬─hald-runner─┬─hald-addon-acpi
  │	 │		   └─hald-addon-inpu
  │	 └─{hald}
  ├─httpd─┬─httpd
  │	  └─4*[httpd───26*[{httpd}]]
  ├─irqbalance
  ├─mcelog
  ├─6*[mingetty]
  ├─modem-manager
  ├─mysqld_safe───mysqld───38*[{mysqld}]
  ├─nginx───13*[nginx]
  ├─php-fpm───76*[php-fpm]
  ├─portreserve
  ├─rpc.idmapd
  ├─rpc.statd
  ├─rpcbind
  ├─rsyslogd───3*[{rsyslogd}]
  ├─2*[sendmail]
  ├─sshd───sshd───bash───pstree
  ├─udevd───2*[udevd]
  ├─wpa_supplicant
  └─xinetd

2. ps -Lf

$ ps -Lf 1892

如下：PHP进程共启动了0个线程

[email protected].**:~# ps -Lf 1892

UID        PID  PPID   LWP  C NLWP STIME TTY      STAT   TIME CMD

root      1892     1  1892  0    1 Jan15 ?        Ss     0:53 php-fpm: master process (/usr/local/php/etc/php-fpm.conf)

Mysql多个线程：

[email protected].*:~#  ps -Lf 3005

UID        PID  PPID   LWP  C NLWP STIME TTY      STAT   TIME CMD

mysql     3005  2011  3005  0   39 Jan15 ?        Sl     2:25 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

mysql     3005  2011  3081  0   39 Jan15 ?        Sl     0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

mysql     3005  2011  3082  0   39 Jan15 ?        Sl     0:05 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

mysql     3005  2011  3083  0   39 Jan15 ?        Sl     0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

mysql     3005  2011  3084  0   39 Jan15 ?        Sl     0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

mysql     3005  2011  3085  0   39 Jan15 ?        Sl     0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

mysql     3005  2011  3086  0   39 Jan15 ?        Sl     0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

mysql     3005  2011  3087  0   39 Jan15 ?        Sl     0:05 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=

3. pstack

pstack显示每个进程的栈跟踪,PHP的fpm主进程，发现这玩意是走的epoll：

[email protected]:~# pstack 1892

#0  0x00000030e9ae8fb3 in __epoll_wait_nocancel () from /lib64/libc.so.6

#1  0x0000000000856a74 in fpm_event_epoll_wait ()

#2  0x000000000084afff in fpm_event_loop ()

#3  0x0000000000845ee7 in fpm_run ()

#4  0x000000000084d900 in main ()

You have new mail in /var/spool/mail/root

• 本文来自：Linux学习教程网