I tried a quite a few variations on ubuntu's slurm, slurm-14.11.7, and numerous build options for mpich. Turns out the ubuntu incompatibility with mpich is because in /etc/hosts the hostname typically resolves to 127.0.1.1. Thus when hydra grabs IPs for both hosts it ends up with the wrong IP. If I remove the line in /etc/hosts with the hostname and 127.0.1.1 it just works. Might be worth having mpich warn about using a 127.0.1.1 IP, at least when using more than one node. I poured over the verbose logs and hydra debug logs without noticing the problem. OpenMPI doesn't have this problem for whatever reason. _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss