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Subject: Re: [OMPI users] poor performance using the openib btl
From: Joshua Ladd (jladd.mlnx_at_[hidden])
Date: 2014-06-26 11:15:31


You might try restarting the device drivers.

$pdsh -g yourcluster service openibd restart

Josh

Sent from my iPhone

> On Jun 26, 2014, at 6:55 AM, "Jeff Squyres (jsquyres)" <jsquyres_at_[hidden]> wrote:
>
> Just curious -- if you run standard ping-pong kinds of MPI benchmarks with the same kind of mpirun command line that you run your application, do you see the expected level of performance? (i.e., verification that you're using the low latency transport, etc.)
>
>
>> On Jun 25, 2014, at 9:52 AM, Fischer, Greg A. <fischega_at_[hidden]> wrote:
>>
>> I looked through my configure log, and that option is not enabled. Thanks for the suggestion.
>>
>> From: users [mailto:users-bounces_at_[hidden]] On Behalf Of Maxime Boissonneault
>> Sent: Wednesday, June 25, 2014 10:51 AM
>> To: Open MPI Users
>> Subject: Re: [OMPI users] poor performance using the openib btl
>>
>> Hi,
>> I recovered the name of the option that caused problems for us. It is --enable-mpi-thread-multiple
>>
>> This option enables threading within OPAL, which was bugged (at least in 1.6.x series). I don't know if it has been fixed in 1.8 series.
>>
>> I do not see your configure line in the attached file, to see if it was enabled or not.
>>
>> Maxime
>>
>> Le 2014-06-25 10:46, Fischer, Greg A. a écrit :
>> Attached are the results of “grep thread” on my configure output. There appears to be some amount of threading, but is there anything I should look for in particular?
>>
>> I see Mike Dubman’s questions on the mailing list website, but his message didn’t appear to make it to my inbox. The answers to his questions are:
>>
>> [binford:fischega] $ rpm -qa | grep ofed
>> ofed-doc-1.5.4.1-0.11.5
>> ofed-kmp-default-1.5.4.1_3.0.76_0.11-0.11.5
>> ofed-1.5.4.1-0.11.5
>>
>> Distro: SLES11 SP3
>>
>> HCA:
>> [binf102:fischega] $ /usr/sbin/ibstat
>> CA 'mlx4_0'
>> CA type: MT26428
>>
>> Command line (path and LD_LIBRARY_PATH are set correctly):
>> mpirun -x LD_LIBRARY_PATH -mca btl openib,sm,self -mca btl_openib_verbose 1 -np 31 $CTF_EXEC
>>
>> From: users [mailto:users-bounces_at_[hidden]] On Behalf Of Maxime Boissonneault
>> Sent: Tuesday, June 24, 2014 6:41 PM
>> To: Open MPI Users
>> Subject: Re: [OMPI users] poor performance using the openib btl
>>
>> What are your threading options for OpenMPI (when it was built) ?
>>
>> I have seen OpenIB BTL completely lock when some level of threading is enabled before.
>>
>> Maxime Boissonneault
>>
>>
>> Le 2014-06-24 18:18, Fischer, Greg A. a écrit :
>> Hello openmpi-users,
>>
>> A few weeks ago, I posted to the list about difficulties I was having getting openib to work with Torque (see “openib segfaults with Torque”, June 6, 2014). The issues were related to Torque imposing restrictive limits on locked memory, and have since been resolved.
>>
>> However, now that I’ve had some time to test the applications, I’m seeing abysmal performance over the openib layer. Applications run with the tcp btl execute about 10x faster than with the openib btl. Clearly something still isn’t quite right.
>>
>> I tried running with “-mca btl_openib_verbose 1”, but didn’t see anything resembling a smoking gun. How should I go about determining the source of the problem? (This uses the same OpenMPI Version 1.8.1 / SLES11 SP3 / GCC 4.8.3 setup discussed previously.)
>>
>> Thanks,
>> Greg
>>
>>
>>
>>
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>>
>>
>>
>>
>> --
>> ---------------------------------
>> Maxime Boissonneault
>> Analyste de calcul - Calcul Québec, Université Laval
>> Ph. D. en physique
>>
>>
>>
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>>
>>
>>
>> --
>> ---------------------------------
>> Maxime Boissonneault
>> Analyste de calcul - Calcul Québec, Université Laval
>> Ph. D. en physique
>> _______________________________________________
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>
>
> --
> 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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