On Apr 17, 2019, at 3:38 AM, Steffen Christgau <christ...@cs.uni-potsdam.de> 
> as written in my original post, I'm using a custom build of 4.0.0 which

I'm sorry -- I missed that (it was at the bottom; my bad).

> was configured with nothing more than a --prefix and
> --enable-mpi-fortran. I checked for updates and it appears that there
> was an issue until 4.0.1 with oversubscription. The changelog states
>> - Fix a problem with the ORTE rmaps_base_oversubscribe MCA paramater.
> Using --mca rmaps_base_oversubscribe 1 on the command line works with
> the 4.0.1 version. I added an entry in the openmpi-mca-params.conf file
> and I can now use over-subscribing calls of mpirun without any
> additional arguments aside from the number of processes.

Excellent!  Glad that v4.0.1 fixed the issue for you.

Jeff Squyres

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