内存分配速度的一点测试

LARGE_INTEGER litmp;
LARGE_INTEGER qt1, qt2;
QueryPerformanceFrequency(&litmp);
double dff = (double)litmp.QuadPart;
QueryPerformanceCounter(&qt1);

 int *a = NULL;
 for (int i = 0; i < 700; ++i)
 {
  for (int j = 0; j < 700; ++j)
  {
   a = new int[4];
  }
 }
 QueryPerformanceCounter(&qt2);
 float ms = ((float)qt2.QuadPart - (float)qt1.QuadPart) * 1000 / dff;
  cout<<"time cost: "<<ms<<endl;

 int *b;
 QueryPerformanceCounter(&qt1);
 b = new int[14 * 700 * 700];
 QueryPerformanceCounter(&qt2);
 ms = ((float)qt2.QuadPart - (float)qt1.QuadPart) * 1000 / dff;
  cout<<"time cost: "<<ms<<endl;