How To Free Linux Cache
These commands will cause the kernel to drop clean caches, dentries and inodes from memory.
To free pagecache:
- sudo sync echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
- sudo sync echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
- sudo sync 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.