Hi Jeff, Thanks for the reply. FYI since I originally posted this, I uninstalled OpenMPI 3.0.1 and installed 3.1.0, but I'm still experiencing the same problem.
When I run the command without the `--mca plm_base_verbose 100` flag, it hangs indefinitely with no output. As far as I can tell, these are the additional processes running on each machine while mpirun is hanging (printed using `ps -aux | less`): On executing host b09-30: user 361714 0.4 0.0 293016 8444 pts/0 Sl+ 15:10 0:00 mpirun --host b09-30,b09-32 hostname user 361719 0.0 0.0 37092 5112 pts/0 T 15:10 0:00 /usr/bin/ssh -x b09-32 orted -mca ess "env" -mca ess_base_jobid "638517248" -mca ess_base_vpid 1 -mca ess_base_num_procs "2" -mca orte_node_regex "b[2:9]-30,b[2:9]-32@0(2)" -mca orte_hnp_uri "638517248.0;tcp://169.228.66.102,10.1.100.30:55090" -mca plm "rsh" -mca pmix "^s1,s2,cray,isolated" On remote host b09-32: root 175273 0.0 0.0 61752 5824 ? Ss 15:10 0:00 sshd: [accepted] sshd 175274 0.0 0.0 61752 708 ? S 15:10 0:00 sshd: [net] I only see orted showing up in the ssh flags on b09-30. Any ideas what I should try next? Thanks, Max
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