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top 可以简单的查询Cpu的基本使用情况

Usage: top[ -m max_procs ] [ -n iterations ] [ -d delay ] [ -s sort_column ] [ -t ] [ -h]

-m num Maximum number of processes to display.

-n num Updates to show before exiting.

-d num Seconds to wait between updates.

-s col Column to sort by (cpu,vss,rss,thr).

-t Show threads instead of processes.

-h Display this help screen.

注意的是top的CPU% 是按全部CPU 来计算的,如果以单线程来计算,比如当时有开启4个核心,那么最多吃到25%。

个人常见的操作方式如: top -t -m 5 -n 2

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