[Baypiggies] Web Crawler/Backend Engineer - San Francisco, CA

[Alec Flett]

Wait, you guys (Aahz too?) have to see the full Dave Beazly talk! He really
knows his stuff, too.

Yes, it's basically single threaded on a single CPU machine... but in the
talk he demonstrates how performance goes down dramatically as you add CPUs
- basically the threads end up spending more time fighting for the GIL than
actually use it, because multiple CPUs actually allow them to fight. On a
single core machine, they play nicely and just take turns.

http://blip.tv/file/2232410

I'd be really interested in seeing the Aahz's FIbbonaci example on a 8x
machine with 7 threads working on Fibbonaci and one doing the UI :) I
suspect it will actually slow to a crawl.

Even Guido thought the talk was "amazing":

http://twitter.com/gvanrossum/status/2348060772

Alec

On Tue, Feb 2, 2010 at 4:20 PM, wesley chun <wescpy at gmail.com> wrote:

> >> In short: multi-threading is really bad in Python 2.x when the threads
> are CPU-bound.
>
>
> some will even argue it *isn't* multithreading in this degenerative
> case... it's just round-robin.
>
> -- wesley
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> "Python Web Development with Django", Addison Wesley, (c) 2009
>    http://withdjango.com
>
> wesley.j.chun :: wescpy-at-gmail.com
> python training and technical consulting
> cyberweb.consulting : silicon valley, ca
> http://cyberwebconsulting.com
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