Rollover/wraparound time of time.clock() under win32?

Peter Hansen peter at engcorp.com
Thu Sep 29 02:21:08 CEST 2005


Russell Warren wrote:
> Does anyone know how long it takes for time.clock() to roll over under
> win32?
> 
> I'm aware that it uses QueryPerformanceCounter under win32... when I've
> used this in the past (other languages) it is a great high-res 64-bit
> performance counter that doesn't roll-over for many (many) years, but
> I'm worried about how many bits Python uses for it and when it will
> roll over.  

Check the source for yourself:

http://cvs.sourceforge.net/viewcvs.py/python/python/dist/src/Modules/timemodule.c?rev=2.144&view=auto

(It takes the full 64-bit value and divides by the frequency, returning 
a double.  Whether or not that works for you only you can say.)

-Peter



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