"sar is one of the old and famous commandline
utilities, which is often overlooked. It provides a wealth of
information when you have kind of performance bottlenecks. By
itself it only provides lengthy columns of numerical data, kind of
hard to interpret. sar exists on most Linux distributions, for
example Ubuntu, Debian, CentOS, Gentoo, and is also available on
Solaris, AIX, and other commercial Unices.
"ksar, on the other hand, is a Java based front end for sar's
numerical data. It produces friendly graphs which could be exported
to .pdf and some other formats.
"Preliminary Note + Disclaimer
"For using this tutorial you should be familiar using a shell,
at least some basic knowledge is advantageous.
"The following tutorial is a kind of cooking receipe using sar
and ksar. It should easily be adoptable to nearly any kind of Linux
or Unix, where the prerequisites are available. I can not issue any
guarantee that this recipe works also for you."