[Beowulf] How to justify the use MPI codes on multicore systems/PCs?

[Rayson Ho]

On Sat, Dec 10, 2011 at 3:21 PM, amjad ali <amjad11 at gmail.com> wrote:
> (2) The latest MPI implementations are intelligent enough that they use some
> efficient mechanism while executing MPI based codes on shared memory
> (multicore) machines.  (please tell me any reference to quote this fact).

Not an academic paper, but from a real MPI library developer/architect:

http://blogs.cisco.com/performance/shared-memory-as-an-mpi-transport/
http://blogs.cisco.com/performance/shared-memory-as-an-mpi-transport-part-2/

Open MPI is used by Japan's K computer (current #1 TOP 500 computer)
and LANL's RoadRunner (#1 Jun 08 – Nov 09), and "10^16 Flops Can't Be
Wrong" and "10^15 Flops Can't Be Wrong":

http://www.open-mpi.org/papers/sc-2008/jsquyres-cisco-booth-talk-2up.pdf

Rayson

=================================
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>
>
> Please help me in formally justifying this and comment/modify above two
> justifications. Better if I you can suggent me to quote some reference of
> any suitable publication in this regard.
>
> best regards,
> Amjad Ali
>
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-- 
Rayson

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