swoole线程和进程

pstree -a | grep php

|   |       `-php server.php   主进程   
  |   |           |-php server.php   管理线程  worker线程死掉后 可以重启一个worker线程
  |   |           |   `-php server.php
  |   |           `-{php}

ps -aux

root        0.0  1.5    pts/    Sl+  :   : /usr/local/php-5.6./bin/php server.php
root        0.0  0.2     pts/    S+   :   : /usr/local/php-5.6./bin/php server.php
root        0.0  0.2     pts/    S+   :   : /usr/local/php-5.6./bin/php server.php

[root@LocalWeb01 ~]# strace -p 3797 （查看目前进程在干嘛）
Process  attached - interrupt to quit
poll([{fd=, events=POLLIN}], , )  =  (Timeout)
time(NULL)                              =
poll([{fd=, events=POLLIN}], , )  =  (Timeout)
time(NULL)                              =
poll([{fd=, events=POLLIN}], , )  =  (Timeout)
time(NULL)                              =
poll([{fd=, events=POLLIN}], , )  =  (Timeout)
time(NULL)                              =
poll([{fd=, events=POLLIN}], , )  =  (Timeout)
time(NULL)                              = 

[root@LocalWeb01 ~]# strace -p
Process  attached - interrupt to quit
wait4(-, 

线程是可以共享进程的内存和资源

master  主进程　　

manager  管理线程

worker