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Thanks Martin! As for Ralph’s question, I was not thinking of deprecating MPI _Comm_spawn and friend for several reasons: We never made headway on a replacement 5-6 years ago in the sessions WG We ought to be able to address the issue with comm</div>
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<p class="MsoNormal"><span style="font-size:11.0pt">Thanks Martin!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">As for Ralph’s question, I was not thinking of deprecating MPI _<i>Comm</i>_spawn and friend for several reasons:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">We never made headway on a replacement 5-6 years ago in the sessions WG<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">We ought to be able to address the issue with comm spawn and sessions with relatively small additions to the standard<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">This MPI functionality is actually being used widely now and deprecating it would generate major pushback<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">DPP could provide functionality to create parent child communicators, although there’s still MPI_Comm_accept/connect as another route if DPP doesn’t
make it into a MPI 6 standard. Note accept/connect isn’t problematic for sessions currently.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We’ll iterate on these <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><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, January 24, 2025 at 3:24 AM<br>
<b>To: </b>MPI Sessions working group <mpiwg-sessions@lists.mpi-forum.org><br>
<b>Cc: </b>Martin SCHREIBER <martin.schreiber@univ-grenoble-alpes.fr><br>
<b>Subject: </b>[EXTERNAL] Re: [mpiwg-sessions] Topics for Sessions WG meeting 27th January 2025<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">Dear all, I'll be at a workshop on Monday, hence, it's not sure whether I can attend this meeting. Resonating with Dominik, I'd like to propose that we're working
in the next months on writing down step-by-step the DPP approach in Latex as an<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:13.5pt;font-family:"Courier New"">Dear all,<br>
<br>
I'll be at a workshop on Monday, hence, it's not sure whether I can attend this meeting.<br>
<br>
Resonating with Dominik, I'd like to propose that we're working in the next months on writing down step-by-step the DPP approach in Latex as an extension to MPI, how it works, the rationality, etc.<br>
<br>
We were working on this over the last years, had many discussions, finally also have an implementation, others also use it, etc. I think it's now time to try to get it into MPI.<br>
<br>
In this way we'll structure things nicely, have some concrete discussion basis, etc.<br>
Any feedback is appreciated.<br>
</span><br>
<span style="font-size:13.5pt;font-family:"Courier New"">@Howard, if you have some better idea, please let me know.<br>
<br>
Cheers,<br>
<br>
Martin<br>
<br>
<br>
</span><o:p></o:p></p>
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<p class="MsoNormal">On 24.01.25 10:47, Dominik Huber via mpiwg-sessions wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi Ralph, in this context, we are discussing a dynamic process approach based on PSets and PSet operations (see Additional PSET query/manipulation functions). The
output of a PSet operation would be a list of PSet IDs that might refer to new<o:p></o:p></span></p>
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<p><span style="font-family:"Calibri",sans-serif;color:black">Hi Ralph,<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">in this context, we are discussing a dynamic process approach based on PSets and PSet operations (see Additional PSET query/manipulation functions).<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">The output of a PSet operation would be a list of PSet IDs that might refer to new processes and can be used to create new MPI groups/communicators.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Regards,<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Dominik<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Von:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> mpiwg-sessions
<a href="mailto:mpiwg-sessions-bounces@lists.mpi-forum.org"><mpiwg-sessions-bounces@lists.mpi-forum.org></a> im Auftrag von Ralph Castain via mpiwg-sessions
<a href="mailto:mpiwg-sessions@lists.mpi-forum.org"><mpiwg-sessions@lists.mpi-forum.org></a><br>
<b>Gesendet:</b> Donnerstag, 23. Januar 2025 19:03:06<br>
<b>An:</b> Ralph Castain via mpiwg-sessions<br>
<b>Cc:</b> Ralph Castain<br>
<b>Betreff:</b> Re: [mpiwg-sessions] Topics for Sessions WG meeting 27th January 2025</span>
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Just curious - if you get rid of MPI_Comm_spawn, then how does one generate new processes? I assume some other API must replace it, so mostly wondering what that
API is. FWIW: generating new processes without automatically connecting them to<o:p></o:p></span></p>
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<p class="MsoNormal">Just curious - if you get rid of MPI_Comm_spawn, then how does one generate new processes? I assume some other API must replace it, so mostly wondering what that API is.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">FWIW: generating new processes without automatically connecting them to the parent seems like a reasonable thing to do, so long as you provide back some info (e.g., a group ID or namespace) that allows you to do it later if you so choose.<o:p></o:p></p>
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<p class="MsoNormal">Ralph<o:p></o:p></p>
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<br>
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<p class="MsoNormal">On Jan 23, 2025, at 8:09<span style="font-family:"Arial",sans-serif"> </span>AM, Pritchard Jr., Howard via mpiwg-sessions
<a href="mailto:mpiwg-sessions@lists.mpi-forum.org"><mpiwg-sessions@lists.mpi-forum.org></a> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hello Folks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Let me know if you have topics to discuss at our next Sessions WG meeting on Monday 1/27/25.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">I’ve attached some slides with ideas for discussion by the WG this calendar year. We can discuss these at the meeting.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Howard<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#0B1A8C">Howard Pritchard</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#545961">Research Scientist</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#545961">HPC-ENV</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C">Los Alamos National Laboratory</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<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><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><sessions_wg_01_27_24.pdf><span style="font-size:9.0pt;font-family:Helvetica">_______________________________________________<br>
mpiwg-sessions mailing list<br>
</span><a href="mailto:mpiwg-sessions@lists.mpi-forum.org"><span style="font-size:9.0pt;font-family:Helvetica">mpiwg-sessions@lists.mpi-forum.org</span></a><span style="font-size:9.0pt;font-family:Helvetica"><br>
</span><a href="https://urldefense.com/v3/__https:/urldefense.us/v3/__https:/*lists.mpi-forum.org/mailman/listinfo/mpiwg-sessions__;!!G_uCfscf7eWS!ZUXQk_T8ELkSZSxGGEU3A_msZynZTIxWid0wkpBJN-watNzJbFOPW6aUULLRJy1Vgaq9m8TB4TM5k4uJOEkmgzY$__;Lw!!Bt8fGhp8LhKGRg!HhEaB2qoFRk1ajmogOq0DSD6e13TGMg0E6zZMHWkzOGKDga2QpEuNe_hJOIlcNwqTYw_A5YljqCF343YVaO7qF_C22qEbisMZQ$"><span style="font-size:9.0pt;font-family:Helvetica">https://lists.mpi-forum.org/mailman/listinfo/mpiwg-sessions</span></a><o:p></o:p></p>
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>mpiwg-sessions mailing list<o:p></o:p></pre>
<pre><a href="mailto:mpiwg-sessions@lists.mpi-forum.org">mpiwg-sessions@lists.mpi-forum.org</a><o:p></o:p></pre>
<pre><a href="https://urldefense.com/v3/__https:/urldefense.us/v3/__https:/*lists.mpi-forum.org/mailman/listinfo/mpiwg-sessions__;!!G_uCfscf7eWS!ZlTJPOSr1gLbyPatItAmuukgETB3J2c9_D-Z_AT49wuEGsBX7Ycgs07Zi3E2Nrv2SAqH3EKmWWW0EF3bNe9zsRdzGgT1MuQ59K0EFfi-iYlY9IgK0jcEwQ$__;Lw!!Bt8fGhp8LhKGRg!HhEaB2qoFRk1ajmogOq0DSD6e13TGMg0E6zZMHWkzOGKDga2QpEuNe_hJOIlcNwqTYw_A5YljqCF343YVaO7qF_C22qB_LqOEw$">https://lists.mpi-forum.org/mailman/listinfo/mpiwg-sessions</a><o:p></o:p></pre>
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<o:p></o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>Univ.-Prof. Dr. Martin Schreiber<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Applied Mathematics | High Perf. Scientific Comp. for PDEs<o:p></o:p></pre>
<pre>Université Grenoble Alpes | Lab. Jean Kuntzmann | Inria | France<o:p></o:p></pre>
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