#---------------------------------------------------
# Benchmarking PingPong 
# #processes = 2 
#---------------------------------------------------
       #bytes #repetitions      t[usec]   Mbytes/sec
            0         1000        18.01         0.00
            8         1000        18.48         0.43
           16         1000        18.52         0.86
           32         1000        18.56         1.72
           64         1000        18.58         3.44
          128         1000        18.58         6.89
          256         1000        18.67        13.71
          512         1000        18.83        27.19
         1024         1000        19.20        53.32
         2048         1000        20.28       101.00
         4096         1000        22.43       182.63
         8192         1000        27.19       301.30
        16384         1000        29.03       564.42
        32768         1000        34.01       963.37
        65536          640        41.61      1574.88
       131072          320        97.18      1348.81
       262144          160       117.75      2226.32
       524288           80       210.79      2487.24
      1048576           40       393.85      2662.38
      2097152           20       762.84      2749.13
      4194304           10      1446.30      2900.03
      8388608            5      2879.48      2913.24
     16777216            2      5878.60      2853.95
     33554432            1     12408.27      2704.20
     67108864            1     25302.27      2652.29
    134217728            1     50699.52      2647.32
    268435456            1    101449.11      2646.01