[Beowulf] OS for 64 bit AMD
hahn at physics.mcmaster.ca
Tue Apr 5 10:28:00 EDT 2005
> f77) is still in use. It's not unusual to have someone come by the
> office once or twice a semester with some code that is f77 or Fortran 4
> and want to know if it can run on one of the clusters. Then, of course,
> we have the whole parallelization discussion. "No it won't just work as
> a parallel program. Yes we might be able to get some speedup with
> automated tools and loop unrolling. No the speedup won't be linear, 1+1
> will not equal 2 for this case. The best speedup would come from a
> rewrite for mpi, etc. etc. "
same here. MPI, unfortunately, is such a massive investment to
someone who is a domain scientist, not a programming freak.
openMP certainly comes in handy, though nontrivial SMP machines
are nontrivial in price (starting to change with quad opterons,
dual core might make a difference too...)
I notice that Pathscale and PGI both have decent OpenMP support...
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