process memory usage
ps -e -o pid,vsz,comm= | sort -n -k 2 http://superuser.com/questions/398862/linux-find-out-what-process-is-using-all-the-ram
ps -e -o pid,vsz,comm= | sort -n -k 2 http://superuser.com/questions/398862/linux-find-out-what-process-is-using-all-the-ram