Based on kernel.org doc on sysctl/vm:
# free pagecache: echo 1 > /proc/sys/vm/drop_caches # free reclaimable slab objects (includes dentries and inodes): echo 2 > /proc/sys/vm/drop_caches # free slab objects and pagecache: echo 3 > /proc/sys/vm/drop_caches |
ATTENTION: Only if "real" RAM is free, and NOT under load or during high-traffic times.
swapoff -a swapon -a |