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testing code performance

Started by sj Oct 5, 2002 at 3:29 AM 2 replies 300+ views

Original Post

Oct 5, 2002 at 3:29 AM

Is there a way to test how long it takes for a code to execute? I''ve tried using timeGetTime and QueryPerformanceCounter but they don''t seem to work very well.

remi

Oct 5, 2002 at 3:55 AM

quote:
I've tried using timeGetTime and QueryPerformanceCounter but they don't seem to work very well.

why can u say that? Do something like this:

DWORD dwElapsedTime=timeGetTime();//Initialize ur variable
MyFunction(); //call ur function
dwElapsedTime-=timeGetTime();//get the interval of time elapsed

Hope it Helps

[edited by - remi on October 5, 2002 4:58:00 AM]

botman

Oct 5, 2002 at 2:24 PM

Or try something like this...

  #include <windows.h>
#include <stdio.h>

void main(void)
{
   long x, y;
   LARGE_INTEGER PerfFrequency;
   LARGE_INTEGER PerfCountStart, PerfCountEnd;
   LARGE_INTEGER PerfDiff;
   float diff_time;
 
   QueryPerformanceFrequency(&PerfFrequency);
 
   if (PerfFrequency.QuadPart == 0)
   {
      printf("Your system doesn't support high-resolution timers!\n");
      return;
   }
 
   printf("ticks per second = %12I64u\n", PerfFrequency);
 
   PerfFrequency.QuadPart /= 1000;  // convert to ticks per millisecond

 
   QueryPerformanceCounter(&PerfCountStart);
 
   y = 0;
   for (x=0; x < 100000000L; x++)
      y = y + x;  // don't optimize the loop away

 
   QueryPerformanceCounter(&PerfCountEnd);
   PerfDiff.QuadPart = PerfCountEnd.QuadPart - PerfCountStart.QuadPart;
 
   diff_time = (float)PerfDiff.QuadPart / (float)PerfFrequency.QuadPart;
 
   printf("PerfDiff = %12I64u  diff_time = %12.5f milliseconds\n", PerfDiff, diff_time);
}

botman

[edited by - botman on October 5, 2002 3:25:29 PM]

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