Linux system memory Full solution! ~

1. First check the memory usage with the free tool:

This is my Linux always data

Mem:	4046824	763620	3283204	9004	10284	61560
-/+buffers/cache:		691776	3355048
	Total	Used	Free	Shared	Buffers	Cached

Can see

To achieve the purpose of releasing the cache, we first need to understand the key configuration file/proc/sys/vm/drop_caches. This file records the parameters of the cache release, the default value is 0, which is not to release the cache. His value can be any number between 0~3, which represents a different meaning:

0– not release
-Free Page Cache
Release Dentries and Inodes
3– Release All Caches

Once we know the parameters, we can use the following instruction to operate according to our needs.

Use sync to store all the non-writable system buffers to disk, including modified I-node, deferred block I/O, and read-write mapping files to avoid losing data during cache release.

Linux system memory Full solution! ~