Noam,  what does ompi_info say - specifically which BTLs are available?
Stupid question though - this is a single system with no connection to a switch?
You probably dont have an OpenSM subnet manager running then - could
that be the root cause?

On Wed, 10 Oct 2018 at 09:53, Dave Love <> wrote:
> RDMA was just broken in the last-but-one(?) RHEL7 kernel release, in
> case that's the problem.  (Fixed in 3.10.0-862.14.4.)
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