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Subject: Re: [OMPI users] Regarding OpenMPI
From: Bhargava Ramu Kavati (ramu.kavati_at_[hidden])
Date: 2011-06-01 23:55:44

Hi Jeff,
Thank you for your quick response.
I have another query, whether OpenMPI depends on Subnet manager/Subnet
administration components of OFED ? (I mean, does OpenMPI require any
services from Subnet manager/Subnet administration components in OFED
without which it cannot run?)

Thanks & Regards,

On Wed, Jun 1, 2011 at 6:28 PM, Jeff Squyres <jsquyres_at_[hidden]> wrote:

> On Jun 1, 2011, at 8:49 AM, Bhargava Ramu Kavati wrote:
> > I am trying to run MPI applications using OpenMPI in OFED Cluster (over
> IB). I am trying to find whether OpenMPI supports a transport interface
> which is based on libibverbs layer in OFED (I mean, which does not use
> connection manager in OFED) ?
> You're asking two different questions.
> 1. Does Open MPI use the native verbs interface in OFED?
> Yes.
> 2. Does Open MPI use one of the OFED connection managers?
> For IB, Open MPI can use the RDMA connection manager, but it does not have
> to. It defaults to not using it (instead, it exchanges IB/verbs connection
> data via TCP sockets).
> --
> Jeff Squyres
> jsquyres_at_[hidden]
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