Ben,
This is a bug that will be fixed in 4.0.1 (it is already fixed in the
v4.0.x branch)
meanwhile, you can add
rmaps_base_mapping_policy=numa:OVERSUBSCRIBE
in your openmpi-mca-params.conf.
Note the default policy is to bind to NUMA domain if there are more than
two MPI tasks, and bind
I used to be able to (e.g. in Open MPI 3.1) put the line
rmaps_base_oversubscribe = true
in my `openmpi-mca-params.conf`, and this would enable oversubscription by
default. In 4.0.0, it appears that this option doesn't work anymore, and I
have to use `--oversubscribe`.
Am I missing something, o
