[Beowulf] MPI Implementations for SMP use

Eric Thibodeau kyron at jrtad.com
Wed Dec 15 15:56:05 EST 2004


Probably opening up another can of worms but, you might want to seriously consider a hybrid (MPI + OpenMP or Pthreads) approach in the case of SMP machines. Local exeution of OpenMP generated code is considerably faster than the locally executed MPI equivalent. PThreads will give you even more gain but requires some code modification (as opposed to OpenMP code if you stick to the #pragma approach).

With the advent of HT processors and more affordable dual motherboards comming on the market, threading cumputation loops (hybrid approach) will become a more and more "logical" approach in structuring parallel programs.

Cheers,

Eric 

"Andrew D. Fant" <fant at pobox.com> wrote ..
> This may be opening up a can of worms, but does anyone have any 
> information about the relative merits of the various open 
> implementations of MPI in SMP systems?  I'm setting up a Linux server 
> with multiple CPUs and I wanted to know if one implementation is 
> significantly faster than others under these conditions.
> 
> Thanks,
> 	Andy
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