How to calculate a operation's time in micro second precision
- by Sanjeet Daga
I want to calculate performance of a function in micro second precision on Windows platform.
Now Windows itself has milisecond granuality, so how can I achieve this.
I tried following sample, but not getting correct results.
LARGE_INTEGER ticksPerSecond = {0};
LARGE_INTEGER tick_1 = {0};
LARGE_INTEGER tick_2 = {0};
double uSec = 1000000;
// Get the frequency
QueryPerformanceFrequency(&ticksPerSecond);
//Calculate per uSec freq
double uFreq = ticksPerSecond.QuadPart/uSec;
// Get counter b4 start of op
QueryPerformanceCounter(&tick_1);
// The ope itself
Sleep(10);
// Get counter after opfinished
QueryPerformanceCounter(&tick_2);
// And now the op time in uSec
double diff = (tick_2.QuadPart/uFreq) - (tick_1.QuadPart/uFreq);
