[Python-Dev] Tunable parameters in dictobject.c (was dictnotes.txt out of date?)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

Kristján Valur Jónsson kristjan at ccpgames.com
Thu Jun 14 13:32:17 CEST 2012

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2012 21:37 To: python-dev at python.org Subject: [Python-Dev] Tunable parameters in dictobject.c (was dictnotes.txt out of date?)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?

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