[Python-Dev] Reducing memory overhead for dictionaries by removing me_hash (original) (raw)

Guido van Rossum guido at python.org
Mon Apr 24 21:03:11 CEST 2006

On 4/23/06, "Martin v. Löwis" <martin at v.loewis.de> wrote:

Kirat Singh wrote: > The reason I looked into this to begin with was that my code used up a > bunch of memory which was traceable to lots of little objects with > instance dicts, so it seemed that if instancedicts took less memory I > wouldn't have to go and add slots to a bunch of my classes, or > rewrite things as tuples/lists, etc.

Ah. In that case, I would be curious if tuning PyDictMINSIZE could help. If you have many objects of the same type, am I right assuming they all have the same number of dictionary keys? If so, what is the dictionary size? Do they use masmalltable, or do they have an extra matable?

But the space savings by using slots is so much bigger! (And less work than hacking the C code too. :-)

-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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