Ubuntu之To reduce unnecessary disk I/O due to swappiness

调整Ubuntu中vm.swappiness值以减少磁盘I/O

于 2011-09-19 19:53:00 发布 · 123 阅读

本文介绍了如何在Ubuntu系统中调整vm.swappiness值以降低不必要的磁盘I/O操作，通过设置较低的swappiness值，如vm.swappiness=10，可以有效减少系统将数据从内存交换到硬盘的频率，从而提高系统性能。

In Ubuntu, there is a configuration value called vm.swappiness. It will control the threshold of memory usage. When the threshold reached, system will start the swap mechanism to swap data from memory to disk. For example, if you set vm.swappiness=65 and your computer has 4GB memory, it means when your system remains 4GB*65%=2.6GB, it will start to swap even if you only use 1.4G memory. Thus, I suggest you to set vm.swappiness to lower value, for exmpale, vm.swappiness=10, to reduce unnecessary disk I/O.

How to?
In terminal
1.# gksudo gedit /etc/sysctl.con
2.Add vm.swappiness=10 to the end of the file
3.Reboot computer

参考https://help.ubuntu.com/community/SwapFaq