number of threads
   n         1         2         4         8        16        32
  32    611.11    319.05    255.64    224.63    247.65    199.00
  31    235.11    153.29    124.02     96.66    113.37    104.51
  30    113.84     73.70     60.03     45.07     52.76     49.98
  29     55.05     35.30     26.28     23.18     27.67     24.65
  28     27.00     17.66     14.90     12.11     11.74     10.54