Linux systems are very effective when used for high performance technical computing.
The Portland Group has selected for you some useful information on Extreme Linux and the Beowulf organization.
Useful Links
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Beowulf.Org
Beowulf Clusters home page
Web page dedicated to promoting and using Linux Clusters (a.k.a. Beowulf Clusters) for high performance technical computing
www.beowulf.org
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The Oak Ridge National Laboratory
Extreme Linux Page
News and reports on constructing and using extreme linux systems.
extremelinux.esd.ornl.gov