Computational.
The main purpose is to run a pilot and get a proof of concept of integrating linux clusters in current architecture, so the low performance of such a cluster is not an issue.
High availability might be considered too (hey! if the developers can't benefit of it, I can always find a way to make it do something useful :-) )
Well, MOSIX/OpenMOSIX doesn't support Linux*on anything but IA32 (if you think of mentioning Moshe Bar claimed OpenMOSIX port to Linux-IA64, please include a link to the source code :-)
The only free implementation of OpenMPI that I know of is http://savannah.nongnu.org/projects/gomp/ but it doesn't seem to support Linux on anything but x86 or SPARC.
I guess it's either PVM (http://www.csm.ornl.gov/pvm/pvm_home.html) or one of those weird packages from SourceForge clustering section that I'm never sure what thwey do, like Condor: http://www.cs.wisc.edu/condor//
Ah, and you'll also want a fast interconnect, which probably cost more then the machines in question :-)
Have fun,
Gilad
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