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Subject: Re: [OMPI users] strange IMB runs
From: Edgar Gabriel (gabriel_at_[hidden])
Date: 2009-07-31 10:42:07


Michael Di Domenico wrote:
> mpi_leave_pinned didn't help still at ~145MB/sec
> btl_sm_eager_limit from 4096 to 8192 pushes me upto ~212MB/sec, but
> pushing it past that doesn't change it anymore
>
> Are there any intelligent programs that can go through and test all
> the different permutations of tunables for openmpi? Outside of me
> just writing an ugly looping script...

actually there is,

http://svn.open-mpi.org/svn/otpo/trunk/

this tool has been used to tune openib parameter, and I would guess that
it could be used without any modification to also run netpipe over sm...

Thanks
Edgar
>
> On Wed, Jul 29, 2009 at 1:55 PM, Dorian Krause<doriankrause_at_[hidden]> wrote:
>> Hi,
>>
>> --mca mpi_leave_pinned 1
>>
>> might help. Take a look at the FAQ for various tuning parameters.
>>
>>
>> Michael Di Domenico wrote:
>>> I'm not sure I understand what's actually happened here. I'm running
>>> IMB on an HP superdome, just comparing the PingPong benchmark
>>>
>>> HP-MPI v2.3
>>> Max ~ 700-800MB/sec
>>>
>>> OpenMPI v1.3
>>> -mca btl self,sm - Max ~ 125-150MB/sec
>>> -mca btl self,tcp - Max ~ 500-550MB/sec
>>>
>>> Is this behavior expected? Are there any tunables to get the OpenMPI
>>> sockets up near HP-MPI?
>>> _______________________________________________
>>> users mailing list
>>> users_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>>
>>>
>> _______________________________________________
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>>
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-- 
Edgar Gabriel
Assistant Professor
Parallel Software Technologies Lab      http://pstl.cs.uh.edu
Department of Computer Science          University of Houston
Philip G. Hoffman Hall, Room 524        Houston, TX-77204, USA
Tel: +1 (713) 743-3857                  Fax: +1 (713) 743-3335