STINNER Victor added the comment:

Windows 7, HPET disabled:

asyncio: IocpProactor.select(100.0000 ms) took 99.871 ms (monotonic=109.000 ms, 
clock res=15.600 ms)
asyncio: IocpProactor.select(10.0000 ms) took 3.779 ms (monotonic=16.000 ms, 
clock res=15.600 ms)

asyncio: SelectSelector.select(100.0000 ms) took 99.608 ms (monotonic=109.000 
ms, clock res=15.600 ms)
asyncio: SelectSelector.select(10.0000 ms) took 2.830 ms (monotonic=16.000 ms, 
clock res=15.600 ms)
asyncio: SelectSelector.select(1.0000 us) took 42.760 us (monotonic=0.000 us, 
clock res=15600.100 us)
asyncio: SelectSelector.select(0.0100 us) took 42.220 us (monotonic=0.000 us, 
clock res=15600.100 us)
asyncio: SelectSelector.select(0.0001 us) took 41.530 us (monotonic=0.000 us, 
clock res=15600.100 us)

If you only look at the monotonic time, we always get elapsed > timeout with 
IocpProactor, but not with SelectSelector.select().

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<http://bugs.python.org/issue20505>
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