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From: smairal_at_[hidden]
Date: 2007-06-10 15:36:38


I am working on an MD simulation algorithm on a shared-memory system
with 4 dual-core AMD 875 opteron processors. I started with MPICH
(1.2.6) and then shifted to OpenMPI and I found very good improvement
with OpenMPI. Even I would be interested in knowing any other
benchmarks with similar comparison between MPICH and OpenMPI.

-Regards,
Sarang.

Quoting Jeff Pummill <jpummil_at_[hidden]>:

> Hey Victor!
>
> I just ran the old classic cpi.c just to verify that OpenMPI was
> working. Now I need to grab some actual benchmarking code. I may try
> the NAS Parallel Benchmarks from here...
>
> http://www.nas.nasa.gov/Resources/Software/npb.html
>
> They were pretty easy to build and run under mpich. I can't imagine
> it'd
> be any different on OpenMPI.
>
>
> Jeff F. Pummill
>
>
>
> victor marian wrote:
> > I can't turn it off right now to look in BIOS (the
> > computer is not at home), but I think the Pentium D
> > which is dual-core doesn't support hyper-threading.
> > The program I made relies on an MPI library (it is
> > not a benchmarking program). I think you are right,
> > maibe I should run a benchmarking program first to see
> > what happens. If you have a benchmarking program I
> > would gladly test it.
> > What is the best way to debug OpenMPI programs?
> > Until now I ran prism which is part of the
> > SunClusterTools.
> >
> > Victor
> >
> > --- Jeff Pummill <jpummil_at_[hidden]> wrote:
> >
> >
> >> Victor,
> >>
> >> Just on a hunch, look in your BIOS to see if
> >> Hyperthreading is turned
> >> on. If so, turn it off. We have seen some unusual
> >> behavior on some of
> >> our machines unless this is disabled.
> >>
> >> I am interested in your progress as I have just
> >> begun working with
> >> OpenMPI as well. I have used mpich for quite some
> >> time, but felt
> >> compelled to get some experience with OpenMPI as
> >> well. I just installed
> >> it this weekend on an AMD dual-core machine with 2
> >> gigs of ram. Maybe I
> >> will try and replicate your experiment if you can
> >> direct me to what
> >> program you are benchmarking.
> >>
> >> Jeff F. Pummill
> >> Senior Linux Cluster Administrator
> >> University of Arkansas
> >> Fayetteville, Arkansas 72701
> >> (479) 575 - 4590
> >> http://hpc.uark.edu
> >>
> >> victor marian wrote:
> >>
> >>> The problem is that my executable file runs on the
> >>> Pentium D in 80 seconds on two cores and in 25
> >>>
> >> seconds
> >>
> >>> on one core.
> >>> And on another Sun SMP machine with 20 processors
> >>>
> >> it
> >>
> >>> runs perfectly (the problem is perfectly
> >>>
> >> scallable).
> >>
> >>> Victor Marian
> >>> Laboratory of Machine Elements and Tribology
> >>> University Politehnica of Bucharest
> >>> Romania
> >>>
> >>>
> >>> --- Brock Palen <brockp_at_[hidden]> wrote:
> >>>
> >>>
> >>>
> >>>> It means that your OMPI was compiled to support
> >>>> uDAPL (a type of
> >>>> infinibad network) but that your computer does
> >>>>
> >> not
> >>
> >>>> have such a card
> >>>> installed. Because you dont it will fall back to
> >>>> ethernet. But
> >>>> because you are just running on a single machine.
> >>>>
> >>>> You will use the
> >>>> fastest form of communication using shared
> >>>>
> >> memory.
> >>
> >>>> so you can ignore
> >>>> that message. Unless in the future you add a
> >>>>
> >> uDAPL
> >>
> >>>> powered network
> >>>> and you still get that message then you need to
> >>>> worry.
> >>>>
> >>>> Brock Palen
> >>>> Center for Advanced Computing
> >>>> brockp_at_[hidden]
> >>>> (734)936-1985
> >>>>
> >>>>
> >>>> On Jun 10, 2007, at 9:18 AM, victor marian wrote:
> >>>>
> >>>>
> >>>>
> >>>>> Hello,
> >>>>>
> >>>>> I have a Pentium D computer with Solaris 10
> >>>>>
> >>>>>
> >>>> installed.
> >>>>
> >>>>
> >>>>> I installed OpenMPI, succesfully compiled my
> >>>>>
> >>>>>
> >>>> Fortran
> >>>>
> >>>>
> >>>>> program, but when giving
> >>>>> mpirun -np 2 progexe
> >>>>> I receive
> >>>>> [0,1,0]: uDAPL on host SERVSOLARIS was unable to
> >>>>>
> >>>>>
> >>>> find
> >>>>
> >>>>
> >>>>> any NICs.
> >>>>> Another transport will be used instead, although
> >>>>>
> >>>>>
> >>>> this
> >>>>
> >>>>
> >>>>> may result in
> >>>>> lower performance.
> >>>>>
> >>>>> I am a begginer in MPI and don't know what it
> >>>>>
> >>>>>
> >>>> means.
> >>>>
> >>>>
> >>>>> What
> >>>>> should I do to solve the problem?
> >>>>> Thank you.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >
> ______________________________________________________________________
> >
> >>>
> >>>
> >>>>> ______________
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> >>>>>
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> >>>>
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