Question

What would be a good way to measure sub-second elapsed time of native C++ code on Windows Platform(I am working on Windows Vista, Visual Studio 2010)

I have tried using

#include <ctime>

int main()
{    
    clock_t start = clock();
    ... some code
    clock_t end = clock();
    double cpu_time = static_cast<double>(end - start)/CLOCKS_PER_SEC;
}

but cpu_time is always 0.

Thanks !

Answer 1

You can use the QueryPerformanceFrequency and QueryPerformanceCounter WinAPI functions. Example