[Mpi3-rma] FW: MPI_Accumulate

Richard Graham richardg at mellanox.com
Tue Oct 2 11:38:46 CDT 2012


From: Richard Graham
Sent: Tuesday, October 02, 2012 12:22 PM
To: MPI 3.0 Remote Memory Access working group (mpi3-rma at lists.mpi-forum.org)
Subject: MPI_Accumulate

What are the requirements placed on MPI_Accumulate if more than one mpi process tries to update the same location ?  Does MPI provide any consistency promises, or is it up to the application to guarantee these ?  I see that the get accumulate routines are defined to be atomic, but don't see the same requirement for accumulate.

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