nmon（Linux下很好用的性能监测工具）介绍

The nmon tool is designed for AIX and Linux performance specialists to use for monitoring and analyzing performance data, including:
* CPU utilization
* Memory use
* Kernel statistics and run queue information
* Disks I/O rates, transfers, and read/write ratios
* Free space on file systems
* Disk adapters
* Network I/O rates, transfers, and read/write ratios
* Paging space and paging rates
* CPU and AIX specification
* Top processors
* IBM HTTP Web cache
* User-defined disk groups
* Machine details and resources
* Asynchronous I/O — AIX only
* Workload Manager (WLM) — AIX only
* IBM TotalStorage® Enterprise Storage Server® (ESS) disks — AIX only
* Network File System (NFS)
* Dynamic LPAR (DLPAR) changes — only pSeries p5 and OpenPower for either AIX or Linux

Ubuntu下可以用 apt-get -y install nmon安装就好。 这个工具的最大特点是日常所需要的性能监测数据都有了，而且图形化表示，很容易解读而且信息很丰富。

具体的可以参考文章：http://www.ibm.com/developerworks/aix/library/au-analyze_aix/ 里面有截屏，很清楚。

祝大家玩的开心。