number of threads
   n         1         2         4         8        16        32
  34    692.86    587.13    467.99    474.97    521.16    614.83
  33    330.98    266.77    225.29    249.01    252.61    283.80
  32    161.67    132.37    111.55    115.44    127.93    138.75
  31     71.58     64.11     56.01     55.88     62.64     69.00
  30     40.79     32.04     27.71     27.60     28.74     34.48
  29     19.64     16.04     14.20     14.89     15.48     17.17
  28     10.42      8.21      7.55      8.11      8.36      9.35