Linux swap switch and Buffer,cache etc cleanup

WAP Cleanup:

The code is as follows:

Swapoff-a && swapon-a

Note: This cleanup has a precondition that the free memory must be larger than the swap space already in use

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 clear it, we also restore it to a value of 0)

The above is to clean up the Linux system swap, buffer and cache methods introduced, swap cleanup is a prerequisite, and swap, buffer timing cleanup is also necessary.

Linux swap switch and Buffer,cache etc cleanup