You can't use replace and sum concurrently at a given target address. ~Jim. On Mon, Mar 10, 2014 at 4:30 PM, Jeff Hammond <[email protected]>wrote:

Given the following, how do I use MPI_NO_OP, MPI_REPLACE and MPI_SUM in accumulate/atomic operations in a standard-compliant way?

accumulate_ops -- if set to same_op, the implementation will assume that all concurrent accumulate calls to the same target address will use the same operation. If set to same_op_no_op, then the implementation will assume that all concurrent accumulate calls to the same target address will use the same operation or MPI_NO_OP. This can eliminate the need to protect access for certain operation types where the hardware can guarantee atomicity. The default is same_op_no_op.

We discuss this before and the resolution was not satisfying to me.

Thanks,

Jeff

-- Jeff Hammond [email protected] _______________________________________________ mpiwg-rma mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-rma