RE: [GD-Windows] Get exact CPU frequency

[Andrew G. <ag...@cl...>]

a) I think the method you are using is only supported on some OSs. A better
approach is to use RDTSC before and then after a known time period has
elapsed, taking measures for slight variations and errors. Try searching
Intels developers site.

b) GetTickCount can be rather inaccurate, use
QueryPerformanceCounter/Frequency

Andrew Grant-
Climax Brighton 



> -----Original Message-----
> From: Grisha Spivak [mailto:_g...@tu...]
> Sent: 15 July 2002 12:52
> To: Gam...@li...
> Subject: [GD-Windows] Get exact CPU frequency
> 
> 
> How can I get exact CPU frequency? I need it for timer which 
> uses RDTSC
> instruction. Currently I read '~MHz' value from
> HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcesso
> r\0, but it
> not exact - after 2 min running difference between my timer 
> and GetTickCount
> is 15 ms.
> 
> 
> 
> 
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