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<p class="MsoNormal">Hi Folks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Let’s meet on 1/29 to continue discussions related to sessions and FT.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I think what will help is to consider several use cases and implications.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here are some I have<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">App using sessions to init/finalize and create at least one initial communicator with MPI_Comm_create_from_group, but also wants to use methods available in slice1 of ULFM proposal
to shrink/repair communicators. Are there any problems?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">App using sessions to init/finalize and create at least one initial communicator with MPI_Comm_create_from_group, and wants to use methods available in slice 1 of ULFM proposal to
create new group from a pset and create a new communicator<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">App using sessions to init/finalize, etc. and when a fail-stop error is detected destroy the session, create a new session query for process sets, etc. and start all over.
<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We should also consider the behavior of MPI_Comm_create_from_group if a process failure occurs while creating a new communicator. The ULFM slice 1 discusses behavior of MPI_COMM_DUP and process failure. We’d probably want similar behavior
for MPI_Comm_create_from_group.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For those with access, the ULFM slice 1 PR is at <a href="https://github.com/mpi-forum/mpi-standard/pull/947">
https://github.com/mpi-forum/mpi-standard/pull/947</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Howard<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">-------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;mso-ligatures:none"><img border="0" width="55" height="55" style="width:.5729in;height:.5729in" id="Picture_x0020_5" src="cid:image001.png@01DA4F7E.AC9AF140" alt="signature_61897647"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;mso-ligatures:none">Howard Pritchard<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#545961;mso-ligatures:none">Research Scientist<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#545961;mso-ligatures:none">HPC-ENV<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;mso-ligatures:none">Los Alamos National Laboratory<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;mso-ligatures:none"><a href="mailto:howardp@lanl.gov"><span style="color:#0563C1">howardp@lanl.gov</span></a><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;mso-ligatures:none"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><a href="https://www.instagram.com/losalamosnatlab/"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_4" src="cid:image002.png@01DA4F7E.AC9AF140" alt="signature_1672648044"></span></b></a><a href="https://twitter.com/LosAlamosNatLab"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_3" src="cid:image003.png@01DA4F7E.AC9AF140" alt="signature_2067890307"></span></b></a><a href="https://www.linkedin.com/company/los-alamos-national-laboratory/"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_2" src="cid:image004.png@01DA4F7E.AC9AF140" alt="signature_1942525183"></span></b></a><a href="https://www.facebook.com/LosAlamosNationalLab/"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_1" src="cid:image005.png@01DA4F7E.AC9AF140" alt="signature_882949974"></span></b></a><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;mso-ligatures:none"><o:p></o:p></span></b></p>
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