SYSSTAT是一个软件包，包含监测系统性能及效率的一组工具，这些工具对于我们收集系统性能数据，比如CPU使用率、硬盘和网络吞吐数据，这些数据的收集和分析，有利于我们判断系统是否正常运行，是提高系统运行效率、安全运行服务器的得力助手
sysstat 10.1.2 改进记录：
- A new field has been added to sar -u and mpstat: %gnice (time spent running a niced guest).
- A new field has been added to sar -r: kbdirty (amount of memory waiting to get written back to disk).
- Support has been added for the systemd service manager.
- The sysstat init script has been updated to make it better conform to the LSB
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