intro1:
            Type  Time(%)      Time     Calls       Avg       Min       Max  Name
 GPU activities:  100.00%  195.34ms         1  195.34ms  195.34ms  195.34ms  add(int, float*, float*)

intro2:
            Type  Time(%)      Time     Calls       Avg       Min       Max  Name
 GPU activities:  100.00%  7.2296ms         1  7.2296ms  7.2296ms  7.2296ms  add(int, float*, float*)


intro3:
 GPU activities:  100.00%  2.5153ms         1  2.5153ms  2.5153ms  2.5153ms  add(int, float*, float*)