Free cache memory on Linux
Some times it is useful to free the cache memory on Linux systems, these simple commands are useful (they should be run as root).
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
Free swap memory
You can also free you swap memory with the following commands (again run them as root).
# swapoff -a
# swapon -a