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When Your Profiler Lies

94 点作者 nikbackm超过 6 年前

3 条评论

srum超过 6 年前
Is the laptop using the HPET for the QPC timer? (10MHz..) and the added latency[0] of calling into that is messing up the reported timings in the profiler?<p>[0]<a href="https:&#x2F;&#x2F;docs.microsoft.com&#x2F;en-gb&#x2F;windows&#x2F;desktop&#x2F;SysInfo&#x2F;acquiring-high-resolution-time-stamps" rel="nofollow">https:&#x2F;&#x2F;docs.microsoft.com&#x2F;en-gb&#x2F;windows&#x2F;desktop&#x2F;SysInfo&#x2F;acq...</a>
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bartwe超过 6 年前
&#x27;Why is QueryPerformanceCounter running at 10 MHz on my Lenovo P51 laptop?&#x27; Wild guess, Spectre mitigation ?
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nwellnhof超过 6 年前
It would probably be a lot easier to deal with such problems if Windows was open source and you could just have a look what the system libraries are actually doing.
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