Tony -- Have you tried compiling Open MPI with UCX support? This is Mellanox (NVIDIA's) preferred mechanism for InfiniBand support these days -- the openib BTL is legacy.
You can run: mpirun --mca pml ucx ... > On Aug 19, 2020, at 12:46 PM, Tony Ladd via users <users@lists.open-mpi.org> > wrote: > > One other update. I compiled OpenMPI-4.0.4 The outcome was the same but there > is no mention of ibv_obj this time. > > Tony > > -- > > Tony Ladd > > Chemical Engineering Department > University of Florida > Gainesville, Florida 32611-6005 > USA > > Email: tladd-"(AT)"-che.ufl.edu > Web http://ladd.che.ufl.edu > > Tel: (352)-392-6509 > FAX: (352)-392-9514 > > <outf34-4.0><outfoam-4.0> -- Jeff Squyres jsquy...@cisco.com
