Kernel drop caches

https://www.kernel.org/doc/Documentation/sysctl/vm.txt

1. Emptying the buffers cache: free -h && sync && echo 3 > /proc/sys/vm/drop_caches && free -h

See also

• sync

https://unix.stackexchange.com/questions/87908/how-do-you-empty-the-buffers-and-cache-on-a-linux-system