size  myGEMM      MKL
 10  2.01388  7.19388
 20  3.42862  29.8619
 30  3.58426  52.4012
 40  62.9468  74.2553
 80  57.8244  85.6843
120  58.1241  86.6167
160  57.4136  88.9605
200  57.8401  80.0653
240  53.7235  83.8521
280  53.4656  86.5005
320  50.8082  86.9534
360  52.6407  89.6706
400  53.3584  88.6375