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This article introduces the knowledge of "how to release memory in linux system". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Let's take a look at memory usage.

[root@node1] # free-m

Total used free shared buffers cached

Mem: 8004 6557 1446 0 163 5630

-/ + buffers/cache: 763 7240

Swap: 1983 0 1983

Temporarily write the data in memory to the hard disk

[root@node1 ~] # sync

Modify / proc/sys/vm/drop_caches file

[root@node1 ~] # echo 3 > / proc/sys/vm/drop_caches

[root@node1 ~] # cat / proc/sys/vm/drop_caches

Look at the memory again.

[root@node1] # free-m

Total used free shared buffers cached

Mem: 8004 631 7372 00 60

-/ + buffers/cache: 570 7433

Swap: 1983 0 1983

Finally released.

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