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
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Jeff Hammond
jeff.science(a)gmail.com
