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Subject: Re: [OMPI users] MPI with RDMA CM
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2012-05-02 11:06:18

On May 2, 2012, at 6:32 AM, Shanthini Kannan wrote:

> I am new to OpenMPI.
> Do I definitely need IPoIB for OpenMPI to work?


> If I include RDMA CM to connect my nodes, isn't that sufficient?

It's been quite a while, but IIRC, RDMA CM requires IPoIB.

FWIW: Open MPI actually defaults to using TCP for wiring up IB connections (doesn't have to be TCP over IPoIB -- it can be regular old TCP over Ethernet).

Jeff Squyres
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