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Subject: Re: [OMPI users] btl_tcp_if_exclude param
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2010-04-13 09:50:15


Ok Jeff,

i have understood. Thanks very much for your help!

Regards.

2010/4/13 Jeff Squyres <jsquyres_at_[hidden]>

> On Apr 13, 2010, at 9:17 AM, Gabriele Fatigati wrote:
>
> > My actual configuration is:
> >
> > btl = ^tcp
> > btl_tcp_if_exclude = eth0,ib0,ib1
> > oob_tcp_include = eth1,lo
> >
> > But is it right? I have some doubt..
>
> It depends on what "right" is in your environment. :-)
>
> Your default config excludes the BTL TCP, assumedly because you want
> OpenFabrics/IB to be the default transport for MPI messages. That's
> probably good. In the "^tcp" case, the BTL TCP isn't even loaded -- so the
> btl_tcp_if_exclude parameter isn't even used. But if someone overrides the
> "btl" parameter and *does* load the TCP BTL, then the btl_tcp_if_exclude
> parameter will mean something.
>
> So it's not harmful to have the btl_tcp_if_exclude parameter specified,
> even if it isn't used most of the time.
>
> The oob_tcp_include parameter tells OMPI how to use it's "out of band"
> channel for setup/teardown of the overall job, creating MPI data
> connections, etc. You're telling it which devices it can use. It probably
> would be ok to use "eth1" and drop the ",lo" part.
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
> For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/
>
>
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-- 
Ing. Gabriele Fatigati
Parallel programmer
CINECA Systems & Tecnologies Department
Supercomputing Group
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it                    Tel:   +39 051 6171722
g.fatigati [AT] cineca.it