FWIW, it's already implemented in Open MPI, but wasn't included in the v1.3 series. On Apr 3, 2009, at 8:02 AM, Jed Brown wrote:

On Fri 2009-04-03 13:53, Jesper Larsson Traeff wrote:

...

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

Thanks Jesper, somehow I missed this. It's exactly what I was looking for.

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