Test speed of a cluster linux

How do i test speed of a cluster linux?

Here's one site with a benchmarking tool,
http://www.haveland.com/index.htm?povbench/index.php

Over the years a test known as the LINPACK benchmark has become a gold standard when comparing performance. It was written by Jack Dongarra more than a decade ago and is still used by top500.org
http://www.top500.org/reports/1993/section2_7_2.html