Patrick, I am not sure Open MPI can do that out of the box.
Maybe hacking pmix_net_get_hostname() in opal/mca/pmix/pmix3x/pmix/src/util/net.c can do the trick. Cheers, Gilles On Thu, Jun 16, 2022 at 4:24 PM Patrick Begou via users < users@lists.open-mpi.org> wrote: > Hi all, > > we are facing a serious problem with OpenMPI (4.0.2) that we have > deployed on a cluster. We do not manage this large cluster and the names > of the nodes do not agree with Internet standards for protocols: they > contain a "_" (underscore) character. > > So OpenMPI complains about this and do not run. > > I've tried to use IP instead of host names in the host file without any > success. > > Is there a known workaround for this as requesting the administrators to > change the nodes names on this large cluster may be difficult. > > Thanks > > Patrick > > >
