Unstable with openmpi in Arch Linux, yet stable with MPICH from conda about rsmpi HOT 4 CLOSED

Are you able to run other MPI programs with your openmpi? I've been running that version since Feb with no issues so I suspect misconfiguration in your environment.

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@jedbrown
Thanks for your reply!
So far I haven't had any issue running Fortran code compiled using extra/openmpi, but I am open to the possibility of something being amiss on my side.
Do you have any pointers to things I should look at?
I recently did a fresh Arch install on this machine, and I haven't messed around with anything on the system side (at least nothing that may be related to openmpi).
It's good to know that you have been able to use this configuration because not being able to use openmpi was a bit off-putting for me, but I believe there is hope. Maybe I should try on a different hardware, I have other machines I could try it on...

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an easy way to double check your OpenMPI package (assuming you have downloaded one of the Open MPI tarballs) is to

• make sure the mpicc in your PATH is pointing to the bin folder of the Open MPI install location
• cd into the examples folders of the open mpi source tree
• make clean && make
• do mpirun -np (some number of processes less than or equal to number of cpus on your system) ./hello_c
• same for ring_c

If these work then that's at least a basic sanity check. there's allso a connectivity_c test which does more messaging in that folder.

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I'll close this issue. Feel free to reopen if you have further information to indicate it's an rsmpi issue.

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