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


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 to core otherwise,

so this option is not strictly equivalent to --oversubscribe.



On 1/26/2019 2:47 AM, Benjamin Brock wrote:
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, or has the parameter name changed?


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