I just saw this interesting tweet:

Unix系统的每个进程,都有一个nice值。这个值越大,优先级越低。然后,还有一个nice命令,每运行一次,指定进程的nice值+10。它的意思就是做人要nice,把更多的CPU时间留给别人。nice值越高,你留给自己的份额就越少。

From hereby @ruanyf.

And i didn’t known that until now. Cool! The name ‘nice’ is nice, too.

Don’t worry if you can’t read Chinese. See also here and here.