>>>
>>> From: users-boun...@open-mpi.org<mailto:users-boun...@open-mpi.org>
>>> [mailto:users-boun...@open-mpi.org<mailto:users-boun...@open-mpi.org>] On
>>> Behalf Of Ralph Castain
>>> Sent: Sunday, June 09, 2013 6:48 PM
>>> To: Open MPI
6 and found that performance is already falling off. Perhaps
> >>> I did not build OpenMPI properly to support the Mellanox adapters that
> >>> are used in the backplane, or I need some configuration setting similar
> >>> to FAQ #19 in the Tuning/Openfabrics section.
ion.
>>>
>>> From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On
>>> Behalf Of Ralph Castain
>>> Sent: Sunday, June 09, 2013 6:48 PM
>>> To: Open MPI Users
>>> Subject: Re: [OMPI users] EXTERNAL: Re: Need advice on performance
the Tuning/Openfabrics section.
>>
>> From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On
>> Behalf Of Ralph Castain
>> Sent: Sunday, June 09, 2013 6:48 PM
>> To: Open MPI Users
>> Subject: Re: [OMPI users] EXTERNAL: Re: Need advice on performan
pi.org [mailto:users-boun...@open-mpi.org] On
> Behalf Of Ralph Castain
> Sent: Sunday, June 09, 2013 6:48 PM
> To: Open MPI Users
> Subject: Re: [OMPI users] EXTERNAL: Re: Need advice on performance problem
>
> Strange - it looks like a classic oversubscription behavior. Anoth
g [mailto:users-boun...@open-mpi.org] On Behalf
Of Ralph Castain
Sent: Sunday, June 09, 2013 6:48 PM
To: Open MPI Users
Subject: Re: [OMPI users] EXTERNAL: Re: Need advice on performance problem
Strange - it looks like a classic oversubscription behavior. Another
possibility is that it isn'
13 6:18 PM
> To: Open MPI Users
> Subject: Re: [OMPI users] EXTERNAL: Re: Need advice on performance problem
>
> So, just to be sure - when you run 320 "cores", you are running across 20
> nodes?
>
> Just want to ensure we are using "core" the same way - som
Correct. 20 nodes, 8 cores per dual-socket on each node = 360.
From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf
Of Ralph Castain
Sent: Sunday, June 09, 2013 6:18 PM
To: Open MPI Users
Subject: Re: [OMPI users] EXTERNAL: Re: Need advice on performance problem
So
So, just to be sure - when you run 320 "cores", you are running across 20 nodes?
Just want to ensure we are using "core" the same way - some people confuse
cores with hyperthreads.
On Jun 9, 2013, at 3:50 PM, "Blosch, Edwin L" wrote:
> 16. dual-socket Xeon, E5-2670.
>
> I am trying a larger
16. dual-socket Xeon, E5-2670.
I am trying a larger model to see if the performance drop-off happens at a
different number of cores.
Also I'm running some intermediate core-count sizes to refine the curve a bit.
I also added mpi_show_mca_params all, and at the same time,
btl_openib_use_eager_rd
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