运维命令

一、如果linux服务器响应慢，先查大概情况

1. vmstat　　讲解
2. top

二、如果是cpu问题

　　如何分析是不是cpu问题？ http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages

二、如果是内存问题

　　用 free -m

三、如果是io任务重，用

　　iotop    讲解

iotop command displays columns for the I/O bandwidth read and written by each process/thread during the sampling period. It also displays the percentage of time the thread/process spent while swapping in and while waiting on I/O.