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Subject: Re: [OMPI users] using OpenMPI + SGE in a heterogeneous network
From: George Bosilca (bosilca_at_[hidden])
Date: 2008-06-06 19:28:53


How do you know the BTL is used ? I run applications in such context,
and as soon as I force the BTLs everything works like a charm.

Please try "--mca pml ob1" to the command line, this will do the trick

   george.

On Jun 6, 2008, at 6:06 PM, SLIM H.A. wrote:

> The btl interface is used. The nodes in both subclusters have the
> same architecture so no need for two binaries. The MPI libraries for
> the interconnect can be selected at runtime, for example through the
> value of the OMPI_MCA_btl environment variable. However that
> variable should then somehow be set once SGE has decided on which
> subcluster to run the job, thus avoiding it to be set in advance
> when submitting. I tried a couple of things like different PEs but
> there does not seem to be an elegant solution; I mean something
> completely transparent to the user like
>
> mpirun -np $NSLOTS executable
>
> as I have seen in some of the OpenMPI FAQs.
>
> Thanks
>
> Henk
>
> From: users-bounces_at_[hidden] on behalf of Reuti
> Sent: Fri 6/6/2008 6:47 PM
> To: Open MPI Users
> Subject: Re: [OMPI users] using OpenMPI + SGE in a heterogeneous
> network
>
> Am 06.06.2008 um 19:31 schrieb Patrick Geoffray:
>
> > SLIM H.A. wrote:
> >> I would be grateful for any advice
> >
> > Just to check, you are not using the MTL for MX, right ? Only the
> BTL
> > interface allow to choose between several devices at run time.
>
> At least there would be the option to built two binaries and decide
> at runtime which to use in your jobscript - depending on the machine
> you landed on.
>
> -- Reuti
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