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)

            ?           - 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}()