resending From: Richard Graham Sent: Tuesday, October 02, 2012 12:22 PM To: MPI 3.0 Remote Memory Access working group ([email protected]) 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. Thanks, Rich