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https: //github. com/mpi-forum/mpi-standard/pull/973 From: mpiwg-sessions <mpiwg-sessions-bounces@ lists. mpi-forum. org> on behalf of MPI Sessions working group <mpiwg-sessions@ lists. mpi-forum. org> Reply-To: MPI Sessions working group
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<p class="MsoNormal"><span style="font-size:11.0pt"><a href="https://urldefense.us/v3/__https://github.com/mpi-forum/mpi-standard/pull/973__;!!G_uCfscf7eWS!bIRi8cRLoYkTTV8MJNlU-Ffa-g5eObbThuKrfLhwmXrESs4C_h3S9tY9LGsue3pOO7xYDn0HXOS3iEaZTfkLZJyahBZCT0U$">https://github.com/mpi-forum/mpi-standard/pull/973</a><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:black">From:
</span></b><span style="font-family:"Calibri",sans-serif;color:black">mpiwg-sessions <mpiwg-sessions-bounces@lists.mpi-forum.org> on behalf of MPI Sessions working group <mpiwg-sessions@lists.mpi-forum.org><br>
<b>Reply-To: </b>MPI Sessions working group <mpiwg-sessions@lists.mpi-forum.org><br>
<b>Date: </b>Friday, July 12, 2024 at 11:26 AM<br>
<b>To: </b>"Holmes, Daniel John" <daniel.john.holmes@intel.com>, MPI Sessions working group <mpiwg-sessions@lists.mpi-forum.org><br>
<b>Cc: </b>"Pritchard Jr., Howard" <howardp@lanl.gov><br>
<b>Subject: </b>Re: [mpiwg-sessions] [EXTERNAL] RE: Looks like we do have a topic to discuss soon</span><span style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi Dan, I think we should add “This procedure is local” as you suggest. I’ll open an issue/pr pair maybe today or on Monday. Thanks. Howard From: "Holmes, Daniel
John" <daniel.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">john.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">holmes@</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">intel.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">com>
Date: Friday, July 12, 2024 <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Dan,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I think we should add “This procedure is local” as you suggest. I’ll open an issue/pr pair maybe today or on Monday.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Howard</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span lang="EN-GB" style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black">From:
</span></b><span lang="EN-GB" style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black">"Holmes, Daniel John" <daniel.john.holmes@intel.com><br>
<b>Date: </b>Friday, July 12, 2024 at 9:53 AM<br>
<b>To: </b>MPI Sessions working group <mpiwg-sessions@lists.mpi-forum.org><br>
<b>Cc: </b>"Pritchard Jr., Howard" <howardp@lanl.gov><br>
<b>Subject: </b>[EXTERNAL] RE: Looks like we do have a topic to discuss soon</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">Hi Howard,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">The MPI_SESSION_INIT procedure is listed as “l” for local and (2) meaning not related to an MPI operation in the huge semantics table in Appendix A (MPI-4.1, p 881, line 29).</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">This is correct but quite well hidden. Perhaps we could add “This procedure is local.” in normative text just after the binding?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">We do elucidate the point, using an example (Example 11.9) where two MPI objects (communicators) are created using the same session in one MPI process but in different sessions in another MPI
process. This example cannot be correct unless the creation/instantiation of a session is NOT collective and does NOT synchronise.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">We could also include one or more pictures, like the ones we’ve used in the WG when talking about bubbles. The text art in Example 11.9 is not the most pleasing visual expression of the concept.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">Best wishes,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">Dan.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"> </span><o:p></o:p></p>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> mpiwg-sessions <mpiwg-sessions-bounces@lists.mpi-forum.org>
<b>On Behalf Of </b>Pritchard Jr., Howard via mpiwg-sessions<br>
<b>Sent:</b> Friday, July 12, 2024 4:32 PM<br>
<b>To:</b> MPI Sessions working group <mpiwg-sessions@lists.mpi-forum.org><br>
<b>Cc:</b> Pritchard Jr., Howard <howardp@lanl.gov><br>
<b>Subject:</b> [mpiwg-sessions] Looks like we do have a topic to discuss soon</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span lang="EN-GB"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span lang="EN-GB" style="font-size:1.0pt;color:white">HI Everyone, Well it looks like we have a topic we do need to discuss soon, possibly for an errata item for 4.</span><span lang="EN-GB" style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span lang="EN-GB" style="font-size:1.0pt;color:white">2.
There seems to be more ambiguity about what is implied by the wording in section 11.</span><span lang="EN-GB" style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span lang="EN-GB" style="font-size:1.0pt;color:white">3 concerning MPI_SESSION_INIT
– Session instantiation </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">HI Everyone,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Well it looks like we have a topic we do need to discuss soon, possibly for an errata item for 4.2.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">There seems to be more ambiguity about what is implied by the wording in section 11.3 concerning</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">MPI_SESSION_INIT –
<i>Session</i> <i>instantiation is intended to be a lightweight operation </i>than many of us may have realized.</span><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">We don’t explicitly state whether this call is in any sense synchronizing with other processes.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">We’ve talked about this so long, for instance in terms of asymmetry with MPI_SESSION_FINALIZE, that we didn’t consider<br>
that an implementor may construe that MPI_SESSION_INIT has the same implicit synchronization behavior as MPI_INIT.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">We may want to add something in an errata to clarify what lightweight means.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Again I will not be able to call in on Monday but perhaps if others want to discuss?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">The meeting will be automatically recorded BTW.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Howar</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-------</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><img border="0" width="55" height="55" style="width:.5729in;height:.5729in" id="Picture_x0020_5" src="cid:image001.png@01DAD915.7D972910" alt="signature_61897647"></span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#0B1A8C">Howard Pritchard</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#545961">Research Scientist</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#545961">HPC-ENV</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C">Los Alamos National Laboratory</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><a href="mailto:howardp@lanl.gov"><span style="color:#0563C1">howardp@lanl.gov</span></a></span></b><o:p></o:p></p>
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<p class="MsoNormal"><a href="https://urldefense.com/v3/__https:/urldefense.us/v3/__https:/www.instagram.com/losalamosnatlab/__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjOnz_WCc$__;!!Bt8fGhp8LhKGRg!EScolUtdFiH3Vc9R3C2SlGDQDHb5clHtD6JA7Y0e5Qu10uvQdqTK9Duyu6IWaHf1sFlcrcBwqR0vEOmpbFX9_IIdbZQ$"><span style="color:windowtext;text-decoration:none"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_4" src="cid:image002.png@01DAD915.7D972910" alt="signature_4180174387"></span></b></span></a><a href="https://urldefense.com/v3/__https:/urldefense.us/v3/__https:/twitter.com/LosAlamosNatLab__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjXwr6J60$__;!!Bt8fGhp8LhKGRg!EScolUtdFiH3Vc9R3C2SlGDQDHb5clHtD6JA7Y0e5Qu10uvQdqTK9Duyu6IWaHf1sFlcrcBwqR0vEOmpbFX98QfFkIA$"><span style="color:windowtext;text-decoration:none"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_3" src="cid:image003.png@01DAD915.7D972910" alt="signature_937381201"></span></b></span></a><a href="https://urldefense.com/v3/__https:/urldefense.us/v3/__https:/www.linkedin.com/company/los-alamos-national-laboratory/__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjRk6GtnI$__;!!Bt8fGhp8LhKGRg!EScolUtdFiH3Vc9R3C2SlGDQDHb5clHtD6JA7Y0e5Qu10uvQdqTK9Duyu6IWaHf1sFlcrcBwqR0vEOmpbFX9vcOhk4w$"><span style="color:windowtext;text-decoration:none"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_2" src="cid:image004.png@01DAD915.7D972910" alt="signature_35314574"></span></b></span></a><a href="https://urldefense.com/v3/__https:/urldefense.us/v3/__https:/www.facebook.com/LosAlamosNationalLab/__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjG2gdL6U$__;!!Bt8fGhp8LhKGRg!EScolUtdFiH3Vc9R3C2SlGDQDHb5clHtD6JA7Y0e5Qu10uvQdqTK9Duyu6IWaHf1sFlcrcBwqR0vEOmpbFX9YNYLLLI$"><span style="color:windowtext;text-decoration:none"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_1" src="cid:image005.png@01DAD915.7D972910" alt="signature_2948438747"></span></b></span></a><o:p></o:p></p>
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