Today I have stumbled across a system resource utilization tool htop which is way more visual than top and it is easier to use too. For example, following is from my single core amazon cloud centos server.
You can easily see that sorting is by CPU and if you want to change it, just press F6 and you get a new menu to choose as to which column you want to sort by. It is really cool!
PS: I have disabled my mail notifications for a while for minor posts as I don’t want to bother subscribers with my tiny posts.