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背景：在多进程时，用那个叫物理内存、虚拟内存的，怎么看？
ps -eo 'pid,ppid,vsz,rss,cmd'|grep -E '(redis\-server|malloc)'   781     1 141192 10700 /usr/local/redis/bin/redis-server 10.44.202.1**:6379


To see every process with a user-defined format:
          ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm

Print only the process IDs of syslogd:
          ps -C syslogd -o pid=

相查看树，能看到进程的继承关系：
ps -eo 'pid,ppid,vsz,rss,cmd' --forest
3078  1214  48620  3032  \_ sshd: xiangdong [priv]
3084  3078  48752  1680      \_ sshd: xiangdong@pts/0,pts/1,pts/2
3085  3084 108352  1788          \_ -bash
3644  3085 189592  2940          |   \_ sudo su -
3645  3644 163756  1964          |       \_ su -
3646  3645 108476  1908          |           \_ -bash
5416  3646 108412  1200          |               \_ ps -eo pid,ppid,vsz,rss,cmd --forest
5417  3646 105460   816          |               \_ less

1481     1  55604  1460 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
1484  1481  76816 22864  \_ nginx: worker process                                          
1485  1481  76816 22936  \_ nginx: worker process                                          
1486  1481  76816 22936  \_ nginx: worker process                                          
1487  1481  76816 22936  \_ nginx: worker process  

作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：http://jackxiang.com/post/9908/
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