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Subject: Re: [OMPI users] IMB-MPI broadcast test stalls for large core counts: debug ideas?
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2010-08-25 13:14:46

On Aug 24, 2010, at 6:26 PM, Rahul Nabar wrote:

>> Are all the eth0's on one subnet and all the eth2's on a different subnet?
>> Or are all eth0's and eth2's all on the same subnet?
> Thanks Jeff! Different subnets. All 10GigE's are on 192.168.x.x and
> all 1GigE's are on 10.0.x.x

It would simplify testing if you could get all the eth0's to be of one type and on the same subnet, and the same for eth1.

Once you do that, try using just one of the networks by telling OMPI to use only one of the devices, something like this:

    mpirun --mca btl_tcp_if_include eth0 ...

Jeff Squyres
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