On Wed, Oct 02, 2013 at 03:59:15AM -0500, Stan Hoeppner wrote: > This will really throw you for a loop. Open a shell window and execute > > ~$ sudo echo 3 > /proc/sys/vm/drop_caches She'll probably get 'Permission denied', you need elevated permissions for the writing process, which in this case is the outer shell. Try instead $ sudo sh -c "echo 3 > /proc/sys/vm/drop_caches"