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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hui,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for the reply. I am spawning the new process using MPI_COMM_SELF instead of MPI_COMM_WORLD. Maybe that is my problem!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Kurt<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">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Zhou, Hui <zhouh@anl.gov>
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<b>Sent:</b> Wednesday, December 4, 2019 1:43 PM<br>
<b>To:</b> discuss@mpich.org<br>
<b>Cc:</b> Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall@nasa.gov><br>
<b>Subject:</b> [EXTERNAL] Re: [mpich-discuss] What is the best way to connect to a spawned process?<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Kurt, <o:p></o:p></p>
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<p class="MsoNormal">Let’s say you have a communicator of 10 processes (MPI_COMM_WORLD or any derivatives), and if you use that communicator to spawn process P, the result inter-communicator will be between your original comm (10 processes) and P’s MPI_COMM_WORLD
(1 process), right? All original 10 processes should be already connected to P. Did I miss anything?<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black">— <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black">Hui Zhou<o:p></o:p></span></p>
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<p class="MsoNormal">On Dec 4, 2019, at 1:31 PM, Mccall, Kurt E. (MSFC-EV41) via discuss <<a href="mailto:discuss@mpich.org">discuss@mpich.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">My job creates 10 processes, and the rank 0 one spawns a distinct process P to function as a master. I’d like to share P’s inter-communicator with the other 9 processes,
but it seems that I can’t pass it directly to them through function arguments to those processes (very weird errors happen involving the inter-communicator). What is an efficient way to connect all 10 processes to P? I’ve looked into MPI_Open_port / MPI_Comm_accept
/ MPI_Comm_connect, but was wondering if there is more streamlined way.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">(I can’t make rank 0 become the master directly, due to the peculiarities of my PBS/Torque node allocations).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Kurt<o:p></o:p></span></p>
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