[Python-Dev] [Python-ideas] Remove GIL with CAS instructions?

Sturla Molden sturla at molden.no
Thu Oct 22 23:42:32 CEST 2009

Phillip Sitbon skrev:
> Some of this is more low-level. I did see higher performance when
> using non-Event objects, although I have not had time to follow up and
> do a deeper analysis. The GIL flashing "problem" with critical
> sections can very likely be rectified with a call to Sleep(0) or
> YieldProcessor() for those who are worried about it. 
For those who don't know what Sleep(0) on Windows does: It returns the 
reminder of the current time-slice back to the system is a thread with 
equal or higher-priority is ready to run. Otherwise it does nothing.

GIL flashing is a serious issue if it happens often; with the current 
event-based GIL on Windows, it never happens (61 cases of GIL flash in 
100,000 periodic checks is as good as never).


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