[Python-Dev] GIL cpu usage problem, confirm me

Benjamin Peterson musiccomposition at gmail.com
Sun Jun 8 15:37:20 CEST 2008

On Sun, Jun 8, 2008 at 6:15 AM, Pau Freixes <pfreixes at gmail.com> wrote:
> Hi List,
> Surly this is a recurring theme into python dev world, but I need your help
> for confirm if the follow image it's really
> http://www.milnou.net/~pfreixes/img/cpu_usage_gil_problem.png
> I'm writing a brief article for my blog and I need to make sure about the
> current problem with GIL and multi core environments, this picture try to
> explain with images the problem for scheduling multiple threads running
> python code of same interpreter into multiple cpu cores. Can  anyone confirm
> to me this picture ?
> And if it's possible answer this two questions I will be happy :/

Next time, comp.lang.python would be the place to ask these questions.

> 1) When this situation it's produced into one core environment whats happens
> when thread library or os switch context into other python thread and this
> don't have a GIL ?

They run together.
> 2) Exist some PEP or plans for modify this and run multiple thread python
> for same interpreter at current time ? for python 3000?

Certainly not in core Python. Have a look
http://code.google.com/p/python-threadsafe/, though.

Benjamin Peterson
"There's no place like"

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