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This article mainly explains "how Linux cleans the cache of swap, buffer and cache". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to clean the cache of swap, buffer and cache by Linux.

Swap cleanup:

The code is as follows:

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:

The code is as follows:

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

Sleep 2

Echo 0 "/ proc/sys/vm/drop_caches

To free pagecache:

The code is as follows:

Echo 1 "/ proc/sys/vm/drop_caches

To free dentries and inodes:

The code is as follows:

Echo 2 "/ proc/sys/vm/drop_caches

To free pagecache,dentries and inodes:

The code is as follows:

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)

Thank you for your reading, the above is the content of "how Linux cleans swap, buffer and cache caches". After the study of this article, I believe you have a deeper understanding of how Linux cleans swap, buffer and cache caches, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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