Timing functions

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2 comments, last by MattS423 21 years ago
Ok, i''m trying to benchmark a float to int conversion. Right now i''m using GetTickCount()...is there a better method than this?
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Three things you can do:

1. Use timeGetTime.
2. Do the function an insane number of times, like 100,000 or more.
3. Repeat a few times.

This should give you a pretty good average time. Also, keep one thing in mind. Say you have a loop. If you put the coversion directly in the loop, your time will be VERY different from the time you''ll get if you put it in a function. Why? Function calls take time, in fact, I''m pretty sure a function call takes more time than the conversion. Keep that in mind.


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Windows Developer Network has an article about Win32 Performance Measurement Options.


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Here is a table from that article:
Call cost of timing functions (as percentage of GetTickCount())Call Cost                  98   NT 4    2000    2000    NT 4    2000     XP(% of GetTickCount())                          (SMP)   (SMP)   (SMP)GetTickCount              100    100     100     100     100     100    100timeGetTime              6881   1333    1264    1241    1322    1239    397GetSystemTimeAsFileTime 79151    195     145     138     194     139     53QueryPerformanceCounter  4939  20707   12873    6675    6550    6578   8839GetThreadTimes              –   7961    8877    9159    8556    9089   2992GetProcessTimes             –   7858    8836    9134    8639    9239   2964
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