BLOCK_SIZE对CUDA矩阵乘法性能影响测试
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    Matrix       Block       Time(ms)       FLOPS(G)
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       256x256           4x4          0.115         292.57
       256x256           8x8          0.040         836.85
       256x256          16x16          0.029        1151.02
       256x256          32x32          0.026        1315.65
----------------------------------------
       512x512           4x4          0.831         323.00
       512x512           8x8          0.264        1018.65
       512x512          16x16          0.190        1416.04
       512x512          32x32          0.174        1542.02
----------------------------------------
      1024x1024           4x4          6.541         328.33
      1024x1024           8x8          2.021        1062.62
      1024x1024          16x16          1.393        1541.24
      1024x1024          32x32          1.353        1586.69
----------------------------------------
      2048x2048           4x4         54.011         318.08
      2048x2048           8x8         16.104        1066.82
      2048x2048          16x16         11.355        1512.97
      2048x2048          32x32         10.978        1565.00
----------------------------------------