[mpiwg-tools] proposed text

Kathryn Mohror kathryn at llnl.gov
Fri Nov 21 09:09:39 CST 2014

Thanks for the feedback Michael and Marc-Andre! I'll make the changes
later this morning and send them out.

Kathryn Mohror, kathryn at llnl.gov, http://scalability.llnl.gov/
Scalability Team @ Lawrence Livermore National Laboratory, Livermore, CA,

On 11/21/14, 2:38 AM, "Marc-Andre Hermanns" <m.a.hermanns at grs-sim.de>

>Hi all,
>> I have an issue with the new text. I'm not sure if I'm missing a
>> point, but for me the equivalence text is redundant. I fail to see a
>> difference between (page 9, lines 43ff)
>> Strings are equivalent if the MPI implementation behaves as if it has
>> an identical character array in each MPI process for the string in
>> question across connected processes. The contents of the returned
>> string will be identical to that of the internal character array, but
>> possibly truncated at any process that supplies an n value to the
>> query routine that is smaller than the length of the internal
>> character array.
>I also think this covers all cases.
>a) a string is equivalent to its internal "source" if it behaves as if
>being copies from it up the the given length.
>b) two strings are equivalent when they behave as if the originate from
>an identical source.
>> and (page 10, lines 1ff)
>> Two strings are equivalent if the internal character array for each
>> MPI process is identical by a character-by-character comparison, and
>> in the output buffer, any arbitrary combination of length arguments
>> result in the same string-prefix up to the smaller of the two lengths.
>> So I'll probably would remove the second part (although I still like
>> the wording).
>> Any opinions on that?
>I talked to Michael on this, and I also think the second part can be
>> The rest looks fine so far.
>Marc-Andre Hermanns
>Jülich Aachen Research Alliance,
>High Performance Computing (JARA-HPC)
>German Research School for Simulation Sciences GmbH
>Schinkelstrasse 2
>52062 Aachen
>Phone: +49 241 80 99753
>Fax: +49 241 80 6 99753
>email: m.a.hermanns at grs-sim.de

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