Re: [OMPI users] Setting mpirun default parameters in a file

See https://www.open-mpi.org/faq/?category=tuning#setting-mca-params for a little more info on how to set MCA params. In terms of physical vs. logical -- are you talking about hyperthreading? If so, Open MPI uses the number of *cores* (by default), because that's what "most" HPC users want (I

Re: [OMPI users] Setting mpirun default parameters in a file

Set the MCA param “rmaps_base_oversubscribe=1” in your default MCA param file, or in your environment > On Jan 10, 2018, at 4:42 AM, Florian Lindner wrote: > > Hello, > > a recent openmpi update on my Arch machine seems to have enabled > --nooversubscribe, as described

[OMPI users] Setting mpirun default parameters in a file

Hello, a recent openmpi update on my Arch machine seems to have enabled --nooversubscribe, as described in the manpage. Since I regularly test on my laptop with just 2 physical cores, I want to set --oversubscribe by default. How can I do that? I am also a bit surprised, that openmpi takes