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 <jpum...@uark.edu>: > 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 <jpum...@uark.edu> 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 <bro...@umich.edu> 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 > >>>> bro...@umich.edu > >>>> (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. > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > > > ______________________________________________________________________ > > > >>> > >>> > >>>>> ______________ > >>>>> Moody friends. Drama queens. Your life? Nope! - > >>>>> > >>>>> > >>>> their life, your > >>>> > >>>> > >>>>> story. Play Sims Stories at Yahoo! Games. > >>>>> http://sims.yahoo.com/ > >>>>> _______________________________________________ > >>>>> users mailing list > >>>>> us...@open-mpi.org > >>>>> > >>>>> > >> http://www.open-mpi.org/mailman/listinfo.cgi/users > >> > >>>>> > >>>>> > >>>> _______________________________________________ > >>>> users mailing list > >>>> us...@open-mpi.org > >>>> > >>>> > >> http://www.open-mpi.org/mailman/listinfo.cgi/users > >> > >>>> > >>>> > >>> > >>> > >>> > >>> > > > ____________________________________________________________________________________ > > > >>> Moody friends. Drama queens. Your life? Nope! - > >>> > >> their life, your story. Play Sims Stories at Yahoo! > >> Games. > >> > >>> http://sims.yahoo.com/ > >>> _______________________________________________ > >>> users mailing list > >>> us...@open-mpi.org > >>> http://www.open-mpi.org/mailman/listinfo.cgi/users > >>> > >>> > >> -- > >> > >> > >>> _______________________________________________ > >>> > >> users mailing list > >> us...@open-mpi.org > >> http://www.open-mpi.org/mailman/listinfo.cgi/users > >> > > > > > > > > > ____________________________________________________________________________________ > > Luggage? GPS? Comic books? > > Check out fitting gifts for grads at Yahoo! Search > > > http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > >
