[Mpi-22] Non-collective reductions: MPI_Op_reduce

Jesper Larsson Traeff traff at [hidden]
Fri Apr 3 06:53:47 CDT 2009

Dear Jed,

what you're looking for sounds like MPI_Reduce_local which is proposed
in ticket #24. There's a fair chance that that will become part
of MPI 2.2

best regards


On Fri, Apr 03, 2009 at 01:43:51PM +0200, Jed Brown wrote:
> I hope this is the right forum.  It looks like I can't make a Trac account.
> There is no way for the user to apply an MPI_Op to local buffers.  I am
> missing this ability for implementing a domain-specific irregular
> reduction, for which use of MPI_Op would be natural.  This functionality
> would be useful for many domain-specific collective operations.  The
> semantics I'm looking for are identical to Open MPI's ompi_op_reduce().
> Any chance this could be made available in MPI-2.2 (or 3)?
> Jed

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