[Mpi3-hybridpm] MPI + threads / MPI +OpenMP

[Anthony Skjellum]

I think MPI_COMM_WORLD should have legacy behavior...

------Original Message------
From: Rajeev Thakur
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To: mpi3-hybridpm at lists.mpi-forum.org
ReplyTo: mpi3-hybridpm at lists.mpi-forum.org
Sent: Aug 13, 2009 12:37 PM
Subject: Re: [Mpi3-hybridpm] MPI + threads / MPI +OpenMP

Some questions just for clarification:

* What does MPI_Comm_size of MPI_COMM_TWORLD return -- the total number
of end points on all processes?

* For collective operations on MPI_COMM_TWORLD, how many
processes/threads must call them -- exactly one for each end point? If
each process has 11 threads and 5 end points say, the user has to ensure
that exactly 5 threads on each process call the collective, one for each
end point?

Rajeev

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Tony Skjellum, PhD
RunTime Computing Solutions, LLC
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