[Python-Dev] PEP for new dictionary implementation

[Antoine Pitrou]

On Fri, 17 Feb 2012 13:10:51 +0000
Mark Shannon <mark at hotpy.org> wrote:

> On 16/02/12 20:45, Antoine Pitrou wrote:
> >
> > On Wed, 08 Feb 2012 19:18:14 +0000
> > Mark Shannon<mark at hotpy.org>  wrote:
> >> Proposed PEP for new dictionary implementation, PEP 410?
> >> is attached.
> >>
> >
> > So, I'm running a few benchmarks using Twisted's test suite
> > (see https://bitbucket.org/pitrou/t3k/wiki/Home).
> >
> > At the end of `python -i bin/trial twisted.internet.test`:
> > ->  vanilla 3.3: RSS = 94 MB
> > ->  new dict:    RSS = 91 MB
> >
> > At the end of `python -i bin/trial twisted.python.test`:
> > ->  vanilla 3.3: RSS = 31.5 MB
> > ->  new dict:    RSS = 30 MB
> >
> > At the end of `python -i bin/trial twisted.conch.test`:
> > ->  vanilla 3.3: RSS = 68 MB
> > ->  new dict:    RSS = 42 MB (!)
> >
> > At the end of `python -i bin/trial twisted.trial.test`:
> > ->  vanilla 3.3: RSS = 32 MB
> > ->  new dict:    RSS = 30 MB
> >
> > At the end of `python -i bin/trial twisted.test`:
> > ->  vanilla 3.3: RSS = 62 MB
> > ->  new dict:    RSS = 78 MB (!)
> 
> In theory, new-dict should never use more a few kbs more than vanilla.
> That looks like a serious leak. I'll investigate as soon as I get a chance.
> Which revision of new-dict are you using?

6c4d5d9dfc6d

Thanks :)

Antoine.