[zhengzongqiang@localhost ~]$ ps aft | grep http 40193 pts/2 S+ 0:00 \_ grep --color=auto http 39658 pts/1 Sl+ 0:00 \_ /opt/soft/php/bin/php /opt/work/htdocs/swoole_mooc/demo/process/../server/http.php 39659 pts/1 S+ 0:00 \_ /opt/soft/php/bin/php /opt/work/htdocs/swoole_mooc/demo/process/../server/http.php 39661 pts/1 S+ 0:00 \_ /opt/soft/php/bin/php /opt/work/htdocs/swoole_mooc/demo/process/../server/http.php 我们可以看到，http进程ID为39659，其父进程ID为39658进程，即swoole_process进程，再父进程就是启动swoole_process进程的进程，即执行此文件的的命令的进程，即39657进程。
39659进程也有子进程，即worker进程。
可以理解为39658进程为master进程，39659进程为manager进程。
链接：https://www.jianshu.com/p/97d3a4227202