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// http://stackoverflow.com/questions/17432502/how-can-i-measure-cpu-time-and-wall-clock-time-on-both-linux-windows
// Windows
#ifdef _WIN32
#include <Windows.h>
inline double get_wall_time()
{
LARGE_INTEGER time, freq;
if (!QueryPerformanceFrequency(&freq))
{
// Handle error
return 0;
}
if (!QueryPerformanceCounter(&time))
{
// Handle error
return 0;
}
return (double) time.QuadPart / freq.QuadPart;
}
inline double get_cpu_time()
{
FILETIME a, b, c, d;
if (GetProcessTimes(GetCurrentProcess(), &a, &b, &c, &d) != 0)
{
// Returns total user time.
// Can be tweaked to include kernel times as well.
return (double) (d.dwLowDateTime |
((unsigned long long) d.dwHighDateTime << 32)) *
0.0000001;
}
else
{
// Handle error
return 0;
}
}
// Posix/Linux
#else
#include <time.h>
#include <sys/time.h>
inline double get_wall_time()
{
struct timeval time;
if (gettimeofday(&time, NULL))
{
// Handle error
return 0;
}
return (double) time.tv_sec + (double) time.tv_usec * .000001;
}
inline double get_cpu_time()
{
return (double) clock() / CLOCKS_PER_SEC;
}
#endif
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