[Mpi-forum] MPI user survey
alexander.supalov at intel.com
Mon Nov 16 09:28:01 CST 2009
Why don't we ask directly: do you want to have subsets in MPI-3 to trade feature richness for performance if you care?
From: mpi-forum-bounces at lists.mpi-forum.org [mailto:mpi-forum-bounces at lists.mpi-forum.org] On Behalf Of Jeff Hammond
Sent: Monday, November 16, 2009 4:23 PM
To: Main MPI Forum mailing list
Subject: Re: [Mpi-forum] MPI user survey
Based upon the issues that came up most of the meeting, we could
append the question to:
x. MPI one-sided communication performance is more important to me
than supporting a rich remote memory access (RMA) feature set.
Complex user-defined datatypes and arbitrary remote atomics are
examples of features that ~may~ lead to reduced performance for some
MPI implementations and/or hardware architectures.
However, any such enumeration will lead to a minefield of user assumptions.
On Mon, Nov 16, 2009 at 7:15 AM, Richard Treumann <treumann at us.ibm.com> wrote:
> MPI one-sided communication performance is more important to me than supporting a rich remote memory access (RMA) feature set.
> Having been involved in several email discussions and knowing what is being pressed, I can guess the desired answer. We cannot legitimately make decisions based on such an ambiguous question: What expectations of typical MPI communication are included in "rich"? Is using any communicator except MPI_COMM_WORLD part of "rich"? Is getting a non-MPI_SUCCESS return code for an error part of rich?
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