Clear Memory Linux

Clear Memory Linux

Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.

To free pagecache:

* echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:

* echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:

* echo 3 > /proc/sys/vm/drop_caches

As this is a non-destructive operation, and dirty objects are not freeable, the user should run "sync" first in order to make sure all cached objects are freed.

Run every 2 hour

nano /etc/crontab

0 */2 * * * root echo 3 > /proc/sys/vm/drop_caches

#!/bin/bash
# Note, we are using "echo 3", but it is not recommended in production instead use "echo 1"
echo "echo 3 > /proc/sys/vm/drop_caches"

chmod 755 clearcache.sh
crontab -e

Append the below line, save and exit to run it at 1am daily.

0  1  *  *  *  /path/to/clearcache.sh

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