How does CentOS do swap and cache cleanup

This article shows you how CentOS cleans up swap and cache. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Swap cleanup:

Swapoff-a & & swapon-a

Note: there is a prerequisite for this cleanup. The free memory must be larger than the swap space already used.

Cache cleanup:

Sync; sync; sync;&& echo3 > / proc/sys/vm/drop_caches

Sleep 2

Echo 0 > / proc/sys/vm/drop_caches

To free pagecache:

Echo 1 > / proc/sys/vm/drop_caches

To free dentries and inodes:

Echo 2 > / proc/sys/vm/drop_caches

To free pagecache,dentries and inodes:

Echo 3 > / proc/sys/vm/drop_caches

The value of / proc/sys/vm/drop_caches defaults to 0 (so after we empty it, we restore it to 0)

The above is how CentOS cleans up swap and cache. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.