Gus Correa wrote:
Terry Frankcombe wrote:
There's been quite some discussion here lately about the effect of OMPI
tuning parameters, particularly w.r.t. collectives.
Is there some tool to probe performance on any given network/collection
of nodes to aid optimisation of these parameters?
(I'm thinking something along the philosophy of ATLAS.)
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Hi Terry
We are also looking for this holy grail.
So far I found this 2008 reference to a certain
"Open Tool for Parameter Optimization (OTPO)":
http://www.springerlink.com/content/h5162153l184r7p0/
OTPO defines itself as this:
"OTPO systematically tests large numbers of combinations of Open MPI’s
run-time tunable parameters for common communication patterns and
performance metrics to determine the “best” set for a given platform."
you can checkout the OTPO code at
http://svn.open-mpi.org/svn/otpo/trunk/
It supports as of now netpipe and skampi collectives for tuning. It is
far from perfect, but it is a starting point. If there are any issues,
please let us know...
Thanks
Edgar
However, I couldn't find any reference to the actual code or scripts,
and whether it is available, tested, free, downloadable, etc.
At this point I am doing these performance
tests in a laborious and inefficient manual way,
when I have the time to do it.
As some of the aforementioned article authors
are list subscribers (and OpenMPI developers),
maybe they can shed some light about OTPO, tuned collective
optimization, OpenMPI runtime parameter optimization, etc.
IMHO, this topic deserves at least a FAQ.
Developers, Jeff: Any suggestions? :)
Many thanks,
Gus Correa
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Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
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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
