linux查看某个进程的线程id(spid)

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)

1   460   425   333 ?           -1 S        0   0:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/storage/mysql/backup --pid-file=/storag
460   863   425   333 ?           -1 Sl     500  21:34  \_ /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 863
PID  SPID TTY          TIME CMD
863   863 ?        00:00:00 mysqld
863   865 ?        00:00:51 mysqld
863   866 ?        00:01:14 mysqld
863   867 ?        00:00:58 mysqld
863   868 ?        00:00:50 mysqld
863   869 ?        00:00:49 mysqld
863   870 ?        00:00:52 mysqld
863   871 ?        00:00:50 mysqld
863   872 ?        00:00:49 mysqld
863   873 ?        00:00:51 mysqld
863   874 ?        00:00:48 mysqld
863   876 ?        00:04:22 mysqld
863   877 ?        00:07:54 mysqld
863   878 ?        00:00:19 mysqld
863   879 ?        00:00:00 mysqld
863   882 ?        00:00:00 mysqld
863   887 ?        00:00:00 mysqld
863  2408 ?        00:00:00 mysqld
863  2428 ?        00:00:00 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
872 mysql     20   0  741m  56m 4972 S  0.3  5.7   0:49.11 mysqld
876 mysql     20   0  741m  56m 4972 S  0.3  5.7   4:22.76 mysqld
863 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:00.06 mysqld
865 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:51.65 mysqld
866 mysql     20   0  741m  56m 4972 S  0.0  5.7   1:14.77 mysqld
867 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:58.15 mysqld
868 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:50.26 mysqld
869 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:49.88 mysqld
870 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:52.48 mysqld
871 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:50.83 mysqld
873 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:51.90 mysqld
874 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:48.10 mysqld
877 mysql     20   0  741m  56m 4972 S  0.0  5.7   7:55.01 mysqld
878 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:19.84 mysqld
879 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:00.00 mysqld
882 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:00.00 mysqld
887 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:00.58 mysqld
2408 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:00.00 mysqld
2428 mysql     20   0  741m  56m 4972 S  0.0  5.7   0:00.06 mysqld

3、pstree

[root@pdd1 ~]# pstree -Aup -h 460
mysqld_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)