You can rm $prefix/lib/openmpi/mca_btl_openib* Or set the MCA param "btl" to "^openib" (which means: not openib) -- either in the environment, on the command line, or in the global config file: https://www.open-mpi.org/faq/?category=tuning#setting-mca-params
> On Apr 20, 2021, at 2:33 PM, Bennet Fauber via users > <users@lists.open-mpi.org> wrote: > > We are getting this message when OpenMPI starts up. > > -------------------------------------------------------------------------- > WARNING: There was an error initializing an OpenFabrics device. > > Local host: gls801 > Local device: mlx5_0 > -------------------------------------------------------------------------- > > I am pretty sure we are not wanting to use that device as an > OpenFabrics device. We would like to use it as a UCX device. > > This is being generated by the OpenMPI 3.1.5 that is bundled with NVHPC. > > I believe that there is a --mca parameter for mpirun that could be > used to ask OpenMPI not to try the OpenFabrics but only to try using > self,ucx,tcp but I don't know what it is. > > Might someone help a poor install monkey out with knowledgeable > advice? I know very little about this network magick! > > Thank you, -- bennet -- Jeff Squyres jsquy...@cisco.com
