How to delete cache to increase Free RAM for a VPS/Server?

mattnz · Jul 31, 2016

I heard that there is a place managing cache in Linux. If so, how to delete cache to increase Free RAM for my VPS or dedicated server?

MooseLucifer · Jul 31, 2016

Every Linux System has three options to clear cache without interrupting any processes or services.

1. Clear PageCache only.

Code:

#sync; echo 1 > /proc/sys/vm/drop_caches

2. Clear dentries and inodes.

Code:

#sync; echo 2 > /proc/sys/vm/drop_caches

3. Clear PageCache, dentries and inodes.

Code:

#sync; echo 3 > /proc/sys/vm/drop_caches

Hope it helps!

mattnz · Aug 15, 2016

Thanks Moose! I will check it out.

and will let you know if it doesn't work

VirtuBox · Aug 15, 2016

If deleting the cache will increase the RAM available, but remember a web server store the files in cache to deliver them faster than if there was stored on the disk.
So it could make your VPS slower than it was with the cache.

For example, with Plesk, I always have 80% of the ram used by the cache

Luxin Host · Aug 15, 2016

As VirtuBox mentioned it is much better for you to use up your RAM for cache than free up RAM that you wont use.
if you are planning to delete cache because of a transfer, change of domain or any specific reason then that is understandable but in other cases, having more RAM but less cache will most likely slow you down.

How to delete cache to increase Free RAM for a VPS/Server?

mattnz

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MooseLucifer

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mattnz

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VirtuBox

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Luxin Host

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