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Mon Nov 6 16:53:45 CET 2006 · http://mail.python.org/pipermail/python-dev/2006-November/069866.html

Talin <talin at acm.org> wrote:
> 
> Guido van Rossum wrote:
> > I don't know how you define simple. In order to be able to have
> > separate GILs  you have to remove *all* sharing of objects between
> > interpreters. And all other data structures, too. It would probably
> > kill performance too, because currently obmalloc relies on the GIL.
> 
> Nitpick: You have to remove all sharing of *mutable* objects. One day, 
> when we get "pure" GC with no refcounting, that will be a meaningful 
> distinction. :)

Python already grew that feature a couple years back, but it never
became mainline. Search google (I don't know the magic incantation off
the top of my head), buf if I remember correctly, it wasn't a
significant win if any at all.

 - Josiah

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Py_NewInterpreter to create separate GIL (branch)