Hello, I'm having communications problem between two processes (with one being spawned by the other, on the *same* physical machine). Everything works as expected when I have network interface such as eth0 or wlo1 up, but as soon as they are down, I get errors (such as « At least one pair of MPI processes are unable to reach each other for MPI communications […] »). I tried to specify a set of mca parameters including the btl "self" parameter and including the lo interface in btl_tcp_if_include list, as advised by https://www.open-mpi.org/faq/?category=tcp but I didn't reach any working state for this code with "external" network interface down.
Got any idea about what I might do wrong ? Example code that triggers the problem: https://ptpb.pw/YOjr.tar.gz Ompi_info: https://ptpb.pw/Vt_V.txt Full log: https://ptpb.pw/JCXn.txt Rémy
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