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Hi Kurt,
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<div class="">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?</div>
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Hui Zhou</div>
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<div class="">On Dec 4, 2019, at 1:31 PM, Mccall, Kurt E. (MSFC-EV41) via discuss <<a href="mailto:discuss@mpich.org" class="">discuss@mpich.org</a>> wrote:</div>
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Hi,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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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 class=""></o:p></div>
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(I can’t make rank 0 become the master directly, due to the peculiarities of my PBS/Torque node allocations).<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Thanks,<o:p class=""></o:p></div>
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Kurt<o:p class=""></o:p></div>
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