RE: [GD-Windows] Performance timing

[tweety <mi...@sy...>]

Disagree again :)
I wrote the following program:

-----------------------------------
#include "stdafx.h"
#include <windows.h>

int _tmain(int argc, _TCHAR* argv[])
{
	DWORD currenttick=3DGetTickCount(), oldtick=3Dcurrenttick,
starttick=3Dcurrenttick;
	while(currenttick - starttick<=3D10000)
	{
		currenttick=3DGetTickCount();
		if(oldtick!=3Dcurrenttick)
		{
			printf("%10d\n", currenttick);
			oldtick=3Dcurrenttick;
		}
	}
	return 0;
}
-----------------------------------

And part of its output is:
-----------------------------------
  70250890
  70250906
  70250921
  70250937
  70250953
  70250968
  70250984
  70251000
  70251015
  70251031
  70251046
  70251062
  70251078
  70251093
  70251109
  70251125
-----------------------------------

As you can see, the delta is between 15-16ms. More than enough to count =
time
between 60hz frames...

----------------------------------
Peace and love,
Tweety
mi...@sy... - twe...@us...
YahooID: tweety_04_01


-----Original Message-----
From: gam...@li...
[mailto:gam...@li...] On Behalf Of =
chaac
Sent: February 11, 2004 5:40 AM
To: gam...@li...
Subject: Re: [GD-Windows] Performance timing

tweety wrote:

> Same here; this was what I was talking about.
> Besides, rdtsc and queryperformancetimer has some very nasty=20
> sincronization problems with multiple processors (they give the time=20
> slightly different wether the code is run on different processors).
> Good old GetTickCount does its job :)

Hi,

But then again, if I remember correcly, GetTickCount goes in steps of =
32ms.
If you need more accuracy, you are out of the game here.

And if you are just profiling on your development machine or at machine =
you
can reach or otherwise know some details about it. You can quite easily =
use
other measurement methods also.

In some cases how fast to get time is not the issue, but accuracy of =
delta
time is.

Thanks,
Vesa J=E4=E4skel=E4inen



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