Drop cache in Linux

echo 3 > /proc/sys/vm/drop_caches

To view the cache issue:

free -m

and look to buff/cache field.

The possible options:

• To free pagecache:

  echo 1 > /proc/sys/vm/drop_caches

• To free reclaimable slab objects (includes dentries and inodes):

  echo 2 > /proc/sys/vm/drop_caches

• To free slab objects and pagecache:

  echo 3 > /proc/sys/vm/drop_caches