Linux View Thread ID (SPID) for a process

Source: Internet
Author: User

Given the wide use of Linux threads, how do we look at the thread ID that a process has?

Now many services are designed for the main process---child process--thread (e.g. Mysql,varnish)

The main process is responsible for listening to connections on the network and sending the connections to child process child process derived threads to process these threads

MySQL (Parent process 460, child process 863)

  1   460   425   333? -1S0   0:xx/bin/SH/usr/local/mysql/bin/mysqld_safe--datadir=/storage/mysql/backup--pid-file=/Storag460   863   425   333? -1Sl -   +: the\_/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/storage/mysql/backup

1, PS

-T Show threads, possibly with SPID column

[Email protected] ~]#PS-t-p863PID SPID TTY time CMD863   863?xx:xx:xxmysqld863   865?xx:xx:Wuyimysqld863   866?xx: on: -mysqld863   867?xx:xx: -mysqld863   868?xx:xx: -mysqld863   869?xx:xx: themysqld863   870?xx:xx: themysqld863   871?xx:xx: -mysqld863   872?xx:xx: themysqld863   873?xx:xx:Wuyimysqld863   874?xx:xx: -mysqld863   876?xx:Geneva: Amysqld863   877?xx: -: Wumysqld863   878?xx:xx: +mysqld863   879?xx:xx:xxmysqld863   882?xx:xx:xxmysqld863   887?xx:xx:xxmysqld863  2408?xx:xx:xxmysqld863  2428?xx:xx:xxMysqld

We can see that the first line of the thread that the child process 863 derives from, SPID 863 is the main thread (we know that the main thread is the process itself)

2. Top

-h:threads Toggle
Starts top with the last remembered ' H ' state reversed. When this toggle are on, all individual threads'll be dis-
Played. Otherwise, top displays a summation of all threads in a process.

Top-h-P 863

PID USER PR NI VIRT RES SHR S%cpu%MEM time+COMMAND872Mysql -   0741m 56m4972S0.3  5.7   0:49.11mysqld876Mysql -   0741m 56m4972S0.3  5.7   4:22.76mysqld863Mysql -   0741m 56m4972S0.0  5.7   0:00.06mysqld865Mysql -   0741m 56m4972S0.0  5.7   0:51.65mysqld866Mysql -   0741m 56m4972S0.0  5.7   1:14.77mysqld867Mysql -   0741m 56m4972S0.0  5.7   0:58.15mysqld868Mysql -   0741m 56m4972S0.0  5.7   0:50.26mysqld869Mysql -   0741m 56m4972S0.0  5.7   0:49.88mysqld870Mysql -   0741m 56m4972S0.0  5.7   0:52.48mysqld871Mysql -   0741m 56m4972S0.0  5.7   0:50.83mysqld873Mysql -   0741m 56m4972S0.0  5.7   0:51.90mysqld874Mysql -   0741m 56m4972S0.0  5.7   0:48.10mysqld877Mysql -   0741m 56m4972S0.0  5.7   7:55.01mysqld878Mysql -   0741m 56m4972S0.0  5.7   0:19.84mysqld879Mysql -   0741m 56m4972S0.0  5.7   0:00.00mysqld882Mysql -   0741m 56m4972S0.0  5.7   0:00.00mysqld887Mysql -   0741m 56m4972S0.0  5.7   0:00.58mysqld2408Mysql -   0741m 56m4972S0.0  5.7   0:00.00mysqld2428Mysql -   0741m 56m4972S0.0  5.7   0:00.06Mysqld

3, Pstree

[Email protected] ~]# pstree-aup-h460Mysqld_safe (460)---mysqld (863, MySQL)-+-{mysqld} (865)                                     |-{MYSQLD} (866)                                     |-{MYSQLD} (867)                                     |-{MYSQLD} (868)                                     |-{MYSQLD} (869)                                     |-{MYSQLD} (870)                                     |-{MYSQLD} (871)                                     |-{MYSQLD} (872)                                     |-{MYSQLD} (873)                                     |-{MYSQLD} (874)                                     |-{MYSQLD} (876)                                     |-{MYSQLD} (877)                                     |-{MYSQLD} (878)                                     |-{MYSQLD} (879)                                     |-{MYSQLD} (882)                                     |-{MYSQLD} (887)                                     |-{MYSQLD} (2408)                                     `-{MYSQLD} (2428)

Linux View Thread ID (SPID) for a process

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