[Mpi-22] Non-collective reductions: MPI_Op_reduce

[Jed Brown]

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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