[Beowulf] More cores/More processors/More nodes?
m.janssens at opencfd.co.uk
Fri Sep 29 05:48:09 EDT 2006
You would use one thread per core (or even less) and use e.g. MPI to do the
communication. Any MPI transfer between cores on the same processor will
probably automatically be done using shared memory or some memory mapping
operation. Coding this explicitly (your 'mixed-mode' model) would gain you
nothing or very little.
> They would need to be ported to use MPI on a cluster. However, I do not
> what happens when you have multi-processor/multi-core nodes in a
> cluster. Do you
> just use MPI (with each thread using its own non-shared memory) or is
> there any
> way to do "mixed-mode" programming which takes advantage of shared
> memory within a
> node (like, an MPI/OpenMP hybrid?).
> Peter Wainwright
The Mews, Picketts Lodge,
Picketts Lane, Salfords,
Surrey RH1 5RG.
Tel: +44 (0)1293 821272
Email: M.Janssens at OpenCFD.co.uk
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