eady> /usr/local/mpich/bin/mpif90 pingpong.f90  -i_dynamic
eady> /usr/local/mpich/bin/mpirun -machinefile mfile -np 2 a.out
 Process            0  is alive on eady.colorado.edu
 Process            1  is alive on ertel.colorado.edu
     size   number      time        slope      bandwidth
     bytes  iterations  microsec    sec/MB     MB/sec
         8      1000        69.8    0.00E+00 Infinity
        16       500        90.5    2.71E+00    3.69E-01
        32       333       117.6    1.78E+00    5.63E-01
        64       250       123.9    2.07E-01    4.83E+00
       128       200       124.1    4.10E-03    2.44E+02
       256       166       124.9    6.20E-03    1.61E+02
       512       142       131.7    2.78E-02    3.60E+01
      1024       125       166.5    7.14E-02    1.40E+01
      2048       111       187.9    2.19E-02    4.57E+01
      4096       100       209.0    1.08E-02    9.26E+01
      8192        90       256.0    1.20E-02    8.31E+01
     16384        83       531.0    3.52E-02    2.84E+01
     32768        76       885.6    2.27E-02    4.41E+01
     65536        71      1543.4    2.10E-02    4.75E+01
    131072        66      3488.0    3.11E-02    3.21E+01
    262144        62      8021.3    3.63E-02    2.76E+01
    524288        58     21833.1    5.52E-02    1.81E+01
   1048576        55     44012.7    4.44E-02    2.25E+01