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Hi Victor,
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<div class="">Thanks for the comments. We’ll discuss them within the WG in the new year.<br class="">
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Cheers,</div>
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Dan.</div>
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—<br class="">
Dr Daniel Holmes PhD<br class="">
Architect (HPC Research)<br class="">
<a href="mailto:d.holmes@epcc.ed.ac.uk" class="">d.holmes@epcc.ed.ac.uk</a><br class="">
Phone: +44 (0) 131 651 3465<br class="">
Mobile: +44 (0) 7940 524 088<br class="">
Address: Room 2.09, Bayes Centre, 47 Potterrow, Central Area, Edinburgh, EH8 9BT</div>
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The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.</div>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Victor Eijkhout <<a href="mailto:eijkhout@tacc.utexas.edu" class="">eijkhout@tacc.utexas.edu</a>><br class="">
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">Re: World/session model</b><br class="">
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">18 December 2020 at 15:58:20 GMT<br class="">
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">HOLMES Daniel <<a href="mailto:d.holmes@epcc.ed.ac.uk" class="">d.holmes@epcc.ed.ac.uk</a>><br class="">
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<div class="">This email was sent to you by someone outside the University.<br class="">
You should only click on links or attachments if you are certain that the email is genuine and the content is safe.<br class="">
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My cc to wg-sessions was rejected. I’m resending this in case it didn’t reach you.<br class="">
%%%%%%%%%%%%%%%%%<br class="">
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<blockquote type="cite" class="">If a program uses both the Sessions model and the World model<br class="">
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Thanks. At first I thought the two models were mutually exclusive but I have since found statements that they can be used together.<br class="">
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But then I find statements such as<br class="">
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<blockquote type="cite" class="">7.2.4 When using the Sessions Model (Section 11.3) for initialization of MPI<br class="">
re- sources, MPI_COMM_WORLD and MPI_COMM_SELF are not valid for use as<br class="">
a communica- tor.<br class="">
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….a little very confusing. To me this sentence says that if I do anything with sessions, the use of MPI_COMM_WORLD is 100 percent ruled out. You mean to say: is ruled out for session-related activities. It certainly confused me.<br class="">
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Likewise, in 11.3 there is a very absolute sounding statement “MPI_COMM_WORLD is not valid for use as a communicator.” I’m sure that this sentence comes with an implicit qualification that it applies to using the Session model, but I’m not quite sure how.<br class="">
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While I’m nitpicking, 11.2.3 has an ambiguous sentence:<br class="">
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“For a library using got the World Model, it needs to know if MPI has been initialized using MPI_INIT or MPI_INIT_THREAD”.<br class="">
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The wrong interpretation is “needs to know which of MPI_INIT / MPI_INIT_THREAD” has been used.<br class="">
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The correct interpretation (which really took me a minute) is “needs to know if MPI has been initialized using _either_of_ MPI_INIT / MPI_INIT_THREAD”<br class="">
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(Oh, and I think “For a library, it needs to know” is not grammatical. Either “A library needs to know” or “For a library, it may be necessary to know”)<br class="">
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Victor.<br class="">
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