Performance monitoring tools (useful resource included)

A friend of mine gave me this link http://www.brendangregg.com/linuxperf.html, which is a website with some useful performance tools that many of us already know, but he has some useful graphics associating what commands go with what portion of the operating system or hardware.

The images below are just a sample of the good resources, and one ought to visit that link for a collection of other useful performance monitoring topics that Brendan Gregg has organized in a very tidy collection that's very well thought out. My short description does not give it justice, it's a great resource.

(scroll up for the link)