There are major differences when you launch via srun vs mpirun as the OMPI
daemons provide a lot of “helper” info to the procs that they don’t get when
directly launched. We’ve tried to minimize those differences, but we can’t
necessarily get them all.
We’ve seen reports of this before, but the
Hi,
I've noticed some performance differences when using mpirun and SLURM for
job startup. Below I've included example output from the OSU bidirectional
bandwidth benchmark that seem to show a significant difference in bandwidth
for larger message sizes. I've looked at the OpenMPI FAQ for runnin
