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Subject: Re: [OMPI users] Ideal MTU in Infiniband
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-01-10 20:43:10


In an Open MPI installation, have a look in $prefix/share/openmpi/mca-
btl-openib-hca-params.ini, find your HCA hardware, and you'll see what
value Open MPI sets the MTU to.

Hope that helps.

On Jan 10, 2008, at 1:56 PM, Parag Kalra wrote:

> But still can someone please tell the numerical value that is idealy
> set or should be set.
>
> On Jan 10, 2008 8:29 PM, Gleb Natapov <glebn_at_[hidden] > wrote:
> On Thu, Jan 10, 2008 at 06:23:50PM +0530, Parag Kalra wrote:
> > Hello all,
> >
> > Any ideas?
> Yes. The idea is that Open MPI knows what best. Run it with a default
> value. Usually bigger MTU is better, but some HW has bugs. Open MPI
> knows this and choses the best value for your HW.
>
> >
> > --
> > Parag Kalra
> >
> >
> > On Jan 10, 2008 4:15 AM, Parag Kalra <paragkalra_at_[hidden]> wrote:
> >
> > > Hello all,
> > >
> > > I am using Open MPI with Infiniband configured.
> > >
> > > What should be the ideal MTU size for infiniband?
> > >
> > > --
> > > PARAG . A . KALRA
> > >
> > >
> > >
> > >
>
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
> --
> Gleb.
> _______________________________________________
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>
>
>
> --
> Love,
> PARAG . A . KALRA
>
> Good judgment comes from experience, and experience comes from bad
> judgment
>
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>
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-- 
Jeff Squyres
Cisco Systems