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Subject: Re: [OMPI users] Factor of 10 loss in performance with 1.3.x
From: Mostyn Lewis (Mostyn.Lewis_at_[hidden])
Date: 2009-04-07 15:00:55


Steve,

Did you rebuild 1.2.9? As I see you have static libraries, maybe there's
a lurking phthread or something else that may have changed over time?

DM

On Tue, 7 Apr 2009, Steve Kargl wrote:

> On Tue, Apr 07, 2009 at 09:10:21AM -0700, Eugene Loh wrote:
>> Steve Kargl wrote:
>>
>>> I can rebuild 1.2.9 and 1.3.1. Is there any particular configure
>>> options that I should enable/disable?
>>
>> I hope someone else will chime in here, because I'm somewhat out of
>> ideas. All I'm saying is that 10-usec latencies on sm with 1.3.0 or
>> 1.3.1 are out of line with what other people see and I don't think it's
>> simply a 1.2.9/1.3.0 issue here. I'm stumped.
>
> With 1.3.2 pre-release, I ran
>
> /usr/local/openmpi-1.3.2/bin/mpiexec --mca btl sm,self \
> --mca mpi_show_mca_params all -machinefile mf_ompi_2 -n 2 ./z | & tee sgk.log
>
> I've placed a file with the output from '--mca mpi_show_mca_params all' at
>
> http://troutmask.apl.washington.edu/~kargl/mca_all_params.txt
>
> Perhaps, someone with more knowledge of the parameters can take a
> quick look. I do observe
>
> [node20.cimu.org:90002] btl_sm_bandwidth=900 (default value)
> [node20.cimu.org:90002] btl_sm_latency=100 (default value)
>
> Are these values tunable?
>
> --
> Steve
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