[Python-Dev] Tunable parameters in dictobject.c (was dictnotes.txt out of date?)

[Kristján Valur Jónsson]

FYI, I had to visit those parameters for my PS3 port and cut down on the bombastic memory footprint of 2.7 dicts.
 Some the supposedly tunable parameters aren´t tunable at all.
See http://blog.ccpgames.com/kristjan/2012/04/25/optimizing-the-dict/
Speed and memory are most often conflicting requirements.  I would like to two or more compile time
settings to choose from:  Memory optimal, speed optimal, (and mix).

Cheers,
K
> -----Original Message-----
> From: python-dev-bounces+kristjan=ccpgames.com at python.org
> [mailto:python-dev-bounces+kristjan=ccpgames.com at python.org] On
> Behalf Of Mark Shannon
> Sent: 13. júní 2012 21:37
> To: python-dev at python.org
> Subject: [Python-Dev] Tunable parameters in dictobject.c (was dictnotes.txt
> out of date?)
> 
> Raymond Hettinger wrote:
> >
> > On Jun 13, 2012, at 10:35 AM, Eli Bendersky wrote:
> >
> >> Did you mean to send this to the list, Raymond?
> >
> >
> > Yes.  I wanted to find-out whether someone approved changing
> > all the dict tunable parameters.   I thought those weren't supposed
> > to have changed.  PEP 412 notes that the existing parameters were
> > finely tuned and it did not make recommendations for changing them.
> 
> The PEP says that the current (3.2) implementation is finely tuned.
> No mention is made of tunable parameters.
> 
> >
> > At one point, I spent a full month testing all of the tunable
> > parameters using dozens of popular Python applications.  The values
> > used in Py3.2 represent the best settings for most apps.
> 
> Best in terms of speed, but what about memory use?
>