[Beowulf] Really efficient MPIs??

Peter St. John peter.st.john at gmail.com
Wed Nov 28 10:37:45 EST 2007


For the sake of others as easily confused as myself, I note (now, thanks!)
that OpenMP and OpenMPI are two different things:
OpenMP (an alternative to the MPI method) is
http://en.wikipedia.org/wiki/OpenMP
OpenMPI (an implementation of MPI) is http://en.wikipedia.org/wiki/OpenMPI
Cool.
Peter

On Nov 28, 2007 8:49 AM, Charlie Peck <charliep at cs.earlham.edu> wrote:

> On Nov 28, 2007, at 8:04 AM, Jeffrey B. Layton wrote:
>
> > If you don't want to pay money for an MPI, then go with Open-MPI.
> > It too can run on various networks without recompiling. Plus it's
> > open-source.
>
> Unless you are using a gigabit ethernet, Open-MPI is noticeably less
> efficient that LAM-MPI over that fabric.
>
> I suspect at some point in the future gige will catch-up but for now
> my (limited) understanding is that the Open-MPI folks are focusing
> their time on higher bandwidth/lower latency fabrics than gige.
>
> charlie
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