鉴于linux下线程的广泛使用 我们怎么查看某个进程拥有的线程id了
现在很多服务的设计 主进程->子进程->线程(比如mysql,varnish)
主进程负责侦听网络上的连接 并把连接发送给子进程 子进程派生线程去处理这些线程
mysql(父进程460,子进程863)
? - S : /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/storage/mysql/backup --pid-file=/storag
? - Sl : \_ /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/storage/mysql/backup
1、ps
-T Show threads, possibly with SPID column
[root@pdd1 ~]# ps -T -p
PID SPID TTY TIME CMD
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
? :: mysqld
我们可以看到子进程863派生出的线程 第一行spid 863是主线程(我们知道主线程就是该进程本身)
2、top
-H : Threads toggle
Starts top with the last remembered ’H’ state reversed. When this toggle is On, all individual threads will 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+ COMMAND
mysql 741m 56m S 0.3 5.7 :49.11 mysqld
mysql 741m 56m S 0.3 5.7 :22.76 mysqld
mysql 741m 56m S 0.0 5.7 :00.06 mysqld
mysql 741m 56m S 0.0 5.7 :51.65 mysqld
mysql 741m 56m S 0.0 5.7 :14.77 mysqld
mysql 741m 56m S 0.0 5.7 :58.15 mysqld
mysql 741m 56m S 0.0 5.7 :50.26 mysqld
mysql 741m 56m S 0.0 5.7 :49.88 mysqld
mysql 741m 56m S 0.0 5.7 :52.48 mysqld
mysql 741m 56m S 0.0 5.7 :50.83 mysqld
mysql 741m 56m S 0.0 5.7 :51.90 mysqld
mysql 741m 56m S 0.0 5.7 :48.10 mysqld
mysql 741m 56m S 0.0 5.7 :55.01 mysqld
mysql 741m 56m S 0.0 5.7 :19.84 mysqld
mysql 741m 56m S 0.0 5.7 :00.00 mysqld
mysql 741m 56m S 0.0 5.7 :00.00 mysqld
mysql 741m 56m S 0.0 5.7 :00.58 mysqld
mysql 741m 56m S 0.0 5.7 :00.00 mysqld
mysql 741m 56m S 0.0 5.7 :00.06 mysqld
3、pstree
[root@pdd1 ~]# pstree -Aup -h
mysqld_safe()---mysqld(,mysql)-+-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
|-{mysqld}()
`-{mysqld}()
