Set the MCA param “rmaps_base_oversubscribe=1” in your default MCA param file, 
or in your environment

> On Jan 10, 2018, at 4:42 AM, Florian Lindner <mailingli...@xgm.de> wrote:
> 
> Hello,
> 
> a recent openmpi update on my Arch machine seems to have enabled 
> --nooversubscribe, as described in the manpage. Since I
> regularly test on my laptop with just 2 physical cores, I want to set 
> --oversubscribe by default.
> 
> How can I do that?
> 
> I am also a bit surprised, that openmpi takes the physical number of cores 
> into account, not the logical (which is 4 on
> my machine).
> 
> Thanks,
> Florian
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