balaji at anl.gov
Thu Mar 13 16:13:16 CDT 2014
On Mar 13, 2014, at 4:08 PM, Jeff Hammond <jeff.science at gmail.com> wrote:
>> It was not disallowed in MPI-2. I meant that we made a mistake in MPI-3 to disallow it since that is not backward compatible.
> You told me two days ago it was at best undefined, which is no more
> useful than disallowed:
I’m not sure what you are referring to, but that was no my intention. Perhaps I misunderstood what you were asking.
It think it’s pretty clear that it’s disallowed in MPI-3, not undefined.
>> IMO, we should have kept the same semantics as MPI-2, but allowed the user to relax it with info arguments.
> Well we broke backwards compatibility but made it almost impossible
> for anyone to notice and certainly didn't add an advice to users so we
> are clearly all jerks.
I like MPI-2’s approach. The data content is undefined, but not an error.
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