http://blog.chinaunix.net/uid-22566367-id-3751084.html
http://blog.csdn.net/fly2nn/article/details/6980236
pstree -p 6762 :mysqld 多线程序,当一个请求来,就建立一个线程 (12244 ,15470) 为MYSQL登陆对应的服务线程,其他线程不变
进程的pid: [root@localhost ~]# ps -ef | grep mysqld | grep -v "grep" | awk '{print $2}' 6762 查看进程的所有线程
[root@localhost ~]# ps -L 6762
PID LWP TTY STAT TIME COMMAND
6762 6762 pts/1 Sl+ 0:02 ./mysqld --debug
6762 6763 pts/1 Sl+ 0:00 ./mysqld --debug
6762 6764 pts/1 Sl+ 0:00 ./mysqld --debug
6762 6765 pts/1 Sl+ 0:00 ./mysqld --debug
6762 6766 pts/1 Sl+ 0:00 ./mysqld --debug
6762 6767 pts/1 Sl+ 0:00 ./mysqld --debug
6762 6768 pts/1 Sl+ 0:00 ./mysqld --debug
6762 6769 pts/1 Sl+ 0:00 ./mysqld --debug
6762 6770 pts/1 Sl+ 0:00 ./mysqld --debug
6762 12244 pts/1 Sl+ 0:00 ./mysqld --debug
查看所有子进程:
[root@localhost ~]# pstree -p 6762
mysqld(6762)─┬─{mysqld}(6763)
├─{mysqld}(6764)
├─{mysqld}(6765)
├─{mysqld}(6766)
├─{mysqld}(6767)
├─{mysqld}(6768)
├─{mysqld}(6769)
├─{mysqld}(6770)
├─{mysqld}(12244)
查看进程的当前状态: [root@localhost ~]# cat /proc/12244/status Name: mysqld State: S (sleeping) Tgid: 6762 Pid: 12244 PPid: 4383