26 Jun
2006
26 Jun
'06
12:44 p.m.
Pavel Vozenilek wrote:
"Philippe Vaucher" wrote:
As I understand it, QueryPerformanceCounter has a hardware defined
resolution that can be queried by calling QueryPerformanceFrequency. QPF provides the counts per second. You should be able to use this to more simply construct the time_duration.
The measurement will be exact if the execution runs on single processor. On multiprocessor there's always chance that the thread moves elsewhere and the measured value will be slightly different.
Yeah, isn't there something I read in the MSDN pages about giving QPC thread affinity to solve this issue? Given the number of dual core chips making their way into the world now this is certain to be a serious problem. Jeff