Idea for removing the GIL...
Adam Tauno Williams
awilliam at whitemice.org
Tue Feb 8 20:07:02 CET 2011
On Tue, 2011-02-08 at 11:52 -0500, Roy Smith wrote:
> In article <mailman.13.1297183120.1633.python-list at python.org>,
> Robert Kern <robert.kern at gmail.com> wrote:
> > Unlike a UNIX fork, CreateProcess() does not have the same copy-on-write
> > semantics for initializing the memory of the new process. If you want to pass
> > data to the children, the data must be pickled and sent across the process
> > boundary. He's not saying that multiprocessing isn't useful at all on
> > Windows, just less useful for the scenarios he is considering here.
> Amen, brother! I used to work on a project that had a build system
> which was very fork() intensive (lots of little perl and shell scripts
Comparing issues that are simply fork() to using "multiprocessing" is a
bit of a false comparison. multiprocessing provides a fairly large set
of information sharing techniques. Just-doing-a-fork isn't really using
multiprocessing - fork'ing scripts isn't at all an equivalent to using
> As far as we could tell, it was entirely due to how bad Windows was at
> process creation.
Nope. If you want performance DO NOT USE cygwin.
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