MPI libfftw Benchmark

Martin Seigert requested this one. It is a timed parallel FFT built on the MPI parallel fftw library. This was run under MPI-LAM (like Doug Eadline's Nasa Parallel Benchmark elsewhere on this page). Martin sent me numbers for dual PIII 500's for comparison. The Athlon seems to scale very closely with CPU clock relative to the Intel on this test, at least so far, winning by a nose (28.02/10.62 = 2.64 vs 1200/500 = 2.4).


fftw_mpi_test 4711 400 1e-8 96

19574 ./fftw_mpi_test running on n0 (o)
19575 ./fftw_mpi_test running on n0 (o)
cpu-time: 10.623836
cpu-time: 10.623842

Compare to:
   dual PIII/500 w 256MB of RAM: 28.02

fftw_mpi_test 4711 800 1e-8 24

19577 ./fftw_mpi_test running on n0 (o)
19578 ./fftw_mpi_test running on n0 (o)
cpu-time: 12.532397
cpu-time: 12.533482

fftw_mpi_test 4711 1600 1e-8 6

19580 ./fftw_mpi_test running on n0 (o)
19581 ./fftw_mpi_test running on n0 (o)
cpu-time: 15.586125
cpu-time: 15.583155