[Python-Dev] Reworking the GIL

John Arbash Meinel john.arbash.meinel at gmail.com
Mon Nov 2 16:22:52 CET 2009

Sturla Molden wrote:
> Antoine Pitrou skrev:
>> It certainly is.
>> But once again, I'm no Windows developer and I don't have a native
>> Windost host
>> to test on; therefore someone else (you?) has to try.
> I'd love to try, but I don't have VC++ to build Python, I use GCC on
> Windows.
> Anyway, the first thing to try then is to call
>   timeBeginPeriod(1);
> once on startup, and leave the rest of the code as it is. If 2-4 ms is
> sufficient we can use timeBeginPeriod(2), etc. Microsoft is claiming
> Windows performs better with high granularity, which is why it is 10 ms
> by default.
> Sturla

That page claims:
  Windows uses the lowest value (that is, highest resolution) requested
  by any process.

I would posit that the chance of having some random process on your
machine request a high-speed timer is high enough that the overhead for
Python doing the same is probably low.


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