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Hi Victor,
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<div class="">The phrase “not valid for use as a communicator” is carefully chosen and does *not* mean “can’t even exist”.</div>
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<div class="">If a program uses both the Sessions model and the World model then that program can use MPI_COMM_WORLD within the context of the World Model but must not use it within the context of the Sessions Model.</div>
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<div class="">Thus, there is no conflict between these two statements.</div>
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<div class="">The Chapter Committee will take a look at the reference issue that you point out. Thanks for catching that! It had not been raised by the reviewers of that section during the Release Candidate procedure. We will hopefully be able to address it
before the Final Release Meeting (Q1 2021).<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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—</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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—</div>
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<div class="">On 17 Dec 2020, at 15:00, Victor Eijkhout <<a href="mailto:eijkhout@tacc.utexas.edu" class="">eijkhout@tacc.utexas.edu</a>> wrote:</div>
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<div class="">I’m reading the 4.x standard. I noticed the following:</div>
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<div class="">7.2.4 When using the Sessions Model (Section 11.3) for initialization of MPI</div>
<div class="">re- sources, MPI_COMM_WORLD and MPI_COMM_SELF are not valid for use as</div>
<div class="">a communica- tor.</div>
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<div class="">11.3 MPI objects derived from the Sessions Model shall not be</div>
<div class="">intermixed in a single MPI procedure call with MPI objects derived</div>
<div class="">from the World Model.</div>
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<div class="">Are those two at odds? The first statement seems to imply that in the second</div>
<div class="">statement objects from the world model can't even exist.</div>
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<div class="">Also:</div>
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<p class=""><span style="font-size: 12.000000pt; font-family: 'CMSS12'" class="">9.1.2 Environmental Inquiries
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<p class=""><span style="font-size: 11.000000pt; font-family: 'CMR10'" class="">When using the World Model (Section
</span><span style="font-size: 11.000000pt; font-family: 'CMR10'; color: rgb(0.000000%, 0.000000%, 100.000000%)" class="">11.2</span><span style="font-size: 11.000000pt; font-family: 'CMR10'" class="">),</span></p>
<p class=""><font face="CMR10" class=""><span style="font-size: 11pt;" class="">This is the 3rd time the phrase </span><span style="font-size: 14.666666984558105px;" class="">“</span><span style="font-size: 11pt;" class="">when using the World Model</span><span style="font-size: 14.666666984558105px;" class="">”</span><span style="font-size: 11pt;" class=""> appears,
but the first time that the reference is given.</span></font></p>
<div class=""><font face="CMR10" class=""><span style="font-size: 11pt;" class=""> </span></font><br class="webkit-block-placeholder">
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