I've seen Centos mentioned a lot in connection to HPC, am I making a
mistake with Ubuntu??
distros differ mainly in their desktop decoration. for actually
getting cluster-type work done, the distro is as close to irrelevant
as imaginable. a matter of taste, really. it's not as if the distros
provide the critical components - they merely repackage the kernel,
libraries, middleware, utilities. wiring yourself to a distro does
affect when you can or have to upgrade your system, though.
consider, for instance, that there's no reason for a compute node to
run whatever distro you choose for your login node. yes, you'd like
to keep some synchronization in libc and middleware libraries. but
you could configure a compute node with only the basics: kernel, shell,
minimal /sbin utilities, single rc script, sshd (in addition to the
probably few libraries needed by jobs - compiler runtimes, probably MPI,
probably acml/mkl)
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