On 11/1/06, Daniel Wesslén <daniel@wesslen.org> wrote:
Michael Fawcett wrote:
Perhaps of interest, NVIDIA has a Timer Function Performance test app that shows the performance of various timing methods. I have no clue if the benchmark is written well, but speed of the actual timing function may be of interest to some users as well as its precision.
http://developer.nvidia.com/object/timer_function_performance.html
For what it's worth, I tried running the test on a dual processor Xeon, a dual core Athlon 64, and a single core Celeron D. In all cases was QueryPerformanceCounter the slowest by at least a factor 5 to the closest. GetTickCount was the fastest, and timeGetTime and the Pentium counter traded places in the middle depending on computer.
I just ran it on my laptop (Pentium M 1.7GHz) with similar results. QPC seems to have the highest overhead by a lot. --Michael Fawcett