Clear filesystem memory cache

sync && echo 3 | sudo tee /proc/sys/vm/drop_caches

Found here: http://ubuntuforums.org/showthread.php?t=589975

By: mariusbutuc

2011-10-18 15:22:25

echo sudo sync tee cache

6 Alternatives + Submit Alt

clear the cache from memory
This is sample output - yours may be different.
2

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

lunarblu · 2009-08-20 17:28:56 7
Clear filesystem memory cache
This is sample output - yours may be different.
2

sysctl -w vm.drop_caches=3

sanidhya_k · 2011-10-18 18:23:38 12
Clear Cached Memory on Ubuntu

"That's it. Not much to see here. The first command writes any cache data that hasn't been written to the disk out to the disk. The second command tells the kernel to drop what's cached. Not much to it. This invalidates the write cache as well as the read cache, which is why we have the sync command first. Supposedly, it is possible to have some cached write data never make it to disk, so use it with caution, and NEVER do it on a production server. You could ... but why take the risk? As long as you are running a post 2.6.16 kernel,..." Source: http://ubuntuforums.org/showpost.php?p=3621283&postcount=1
This is sample output - yours may be different.
0

sudo sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

StephenJudge · 2012-03-17 08:27:58 15
Clear Cached Memory on Ubuntu

Clear Cached Memory on Ubuntu based distributions, and also display memory status. Please do not use this on a production machine unless you really really know what you are doing. Echo 3 is a kinder way of purging the memory, you can also use 'echo 2' or 'echo 1' if #1 You know what you are doing, and #2 refer to number 1 :-)
This is sample output - yours may be different.
0

sudo free && sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

tg0000 · 2021-09-13 16:45:20 711
Flush memory cache
This is sample output - yours may be different.
-3

free && sync && echo 3 > /proc/sys/vm/drop_caches && free

ironmarc · 2016-11-02 08:51:01 23

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