Hi Victor I'd suggest 3 seconds of CPU time is far, far to small a problem to do scaling tests with. Even with only 2 CPUs, I wouldn't go below 100 times that.
On Mon, 2007-06-11 at 01:10 -0700, victor marian wrote: > Hi Jeff > > I ran the NAS Parallel Bechmark and it gives for me > -bash%/export/home/vmarian/fortran/benchmarks/NPB3.2/NPB3.2-MPI/bin$ > mpirun -np 1 cg.A.1 > -------------------------------------------------------------------------- > [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. > -------------------------------------------------------------------------- > NAS Parallel Benchmarks 3.2 -- CG Benchmark > > Size: 14000 > Iterations: 15 > Number of active processes: 1 > Number of nonzeroes per row: 11 > Eigenvalue shift: .200E+02 > Benchmark completed > VERIFICATION SUCCESSFUL > Zeta is 0.171302350540E+02 > Error is 0.512264003323E-13 > > > CG Benchmark Completed. > Class = A > Size = 14000 > Iterations = 15 > Time in seconds = 3.02 > Total processes = 1 > Compiled procs = 1 > Mop/s total = 495.93 > Mop/s/process = 495.93 > Operation type = floating point > Verification = SUCCESSFUL > Version = 3.2 > Compile date = 11 Jun 2007 > > > -bash%/export/home/vmarian/fortran/benchmarks/NPB3.2/NPB3.2-MPI/bin$ > mpirun -np 2 cg.A.2 > -------------------------------------------------------------------------- > [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. > -------------------------------------------------------------------------- > -------------------------------------------------------------------------- > [0,1,1]: uDAPL on host SERVSOLARIS was unable to find > any NICs. > Another transport will be used instead, although this > may result in > lower performance. > -------------------------------------------------------------------------- > > > NAS Parallel Benchmarks 3.2 -- CG Benchmark > > Size: 14000 > Iterations: 15 > Number of active processes: 2 > Number of nonzeroes per row: 11 > Eigenvalue shift: .200E+02 > > Benchmark completed > VERIFICATION SUCCESSFUL > Zeta is 0.171302350540E+02 > Error is 0.522633719989E-13 > > > CG Benchmark Completed. > Class = A > Size = 14000 > Iterations = 15 > Time in seconds = 2.47 > Total processes = 2 > Compiled procs = 2 > Mop/s total = 606.32 > Mop/s/process = 303.16 > Operation type = floating point > Verification = SUCCESSFUL > Version = 3.2 > Compile date = 11 Jun 2007 > > > You can remark that the scalling is not so good > like yours. Maibe I am having comunications problems > between processors. > You can also remark that I am faster on one process > concared to your processor. > > Victor > > > > > > --- Jeff Pummill <jpum...@uark.edu> wrote: > > > Perfect! Thanks Jeff! > > > > The NAS Parallel Benchmark on a dual core AMD > > machine now returns this... > > [jpummil@localhost bin]$ mpirun -np 1 cg.A.1 > > NAS Parallel Benchmarks 3.2 -- CG Benchmark > > CG Benchmark Completed. > > Class = A > > Size = 14000 > > Iterations = 15 > > Time in seconds = 4.75 > > Total processes = 1 > > Compiled procs = 1 > > Mop/s total = 315.32 > > > > ...and... > > > > [jpummil@localhost bin]$ mpirun -np 2 cg.A.2 > > NAS Parallel Benchmarks 3.2 -- CG Benchmark > > CG Benchmark Completed. > > Class = A > > Size = 14000 > > Iterations = 15 > > Time in seconds = 2.48 > > Total processes = 2 > > Compiled procs = 2 > > Mop/s total = 604.46 > > > > Not quite linear, but one must account for all of > > the OS traffic that > > one core or the other must deal with. > > > > > > Jeff F. Pummill > > Senior Linux Cluster Administrator > > University of Arkansas > > Fayetteville, Arkansas 72701 > > (479) 575 - 4590 > > http://hpc.uark.edu > > > > "A supercomputer is a device for turning > > compute-bound > > problems into I/O-bound problems." -Seymour Cray > > > > > > Jeff Squyres wrote: > > > Just remove the -L and -l arguments -- OMPI's > > "mpif90" (and other > > > wrapper compilers) will do all that magic for you. > > > > > > Many -L/-l arguments in MPI application Makefiles > > are throwbacks to > > > older versions of MPICH wrapper compilers that > > didn't always work > > > properly. Those days are long gone; most (all?) > > MPI wrapper > > > compilers do not need you to specify -L/-l these > > days. > > > > > > > > > > > > On Jun 10, 2007, at 3:08 PM, Jeff Pummill wrote: > > > > > > > > >> Maybe the "dumb question" of the week, but here > > goes... > > >> > > >> I am trying to compile a piece of code (NPB) > > under OpenMPI and I am > > >> having a problem with specifying the right > > library. Possibly > > >> something I need to define in a LD_LIBRARY_PATH > > statement? > > >> > > >> Using Gnu mpich, the line looked like this... > > >> > > >> FMPI_LIB = -L/opt/mpich/gnu/lib/ -lmpich > > >> > > >> I tried to replace this with... > > >> > > >> FMPI_LIB = -L/usr/lib/openmpi/ -llibmpi > > >> > > >> to which the make responded... > > >> mpif90 -O -o ../bin/cg.A.2 cg.o > > ../common/print_results.o ../common/ > > >> randdp.o ../common/timers.o -L/usr/lib/openmpi/ > > -llibmpi > > >> /usr/bin/ld: cannot find -llibmpi > > >> collect2: ld returned 1 exit status > > >> > > >> Wrong library file? Setup or path issue? > > >> > > >> -- > > >> Jeff F. Pummill > > >> Senior Linux Cluster Administrator > > >> University of Arkansas > > >> > > >> _______________________________________________ > > >> 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 > > > > > ____________________________________________________________________________________ > Get your own web address. > Have a HUGE year through Yahoo! Small Business. > http://smallbusiness.yahoo.com/domains/?p=BESTDEAL > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
