[Python-Dev] Dictionary tuning (original) (raw)

Delaney, Timothy C (Timothy) tdelaney@avaya.com
Tue, 29 Apr 2003 17:25:50 +1000

From: Tim Peters [mailto:tim.one@comcast.net] =20 [Delaney, Timothy C] > That's what I was getting at. I know that (for example) most > classes I create have less that 16 entries in their dict. > With this change, each class instance would take (approx) twice > as much memory for its dict. I suspect that class instance > dict is the most common dictionary I use. =20 Do they have fewer then 6 entries? Dicts with 5 or fewer=20 entries don't change size at all (an "empty dict" comes with room for 5 entries).

No hard and fast data here. That would require grovelling through code = ;) I was making an quick estimate.

Off the top of my head, most classes I create have ...

init 3-5 other methods 3-5 instance attributes

Hmm - that would only be 3-5 instance dict entries, with 4-6 class dict entries, correct?

I was forgetting that methods are put into the instance dict.

Bah - it's too late. It's the end of the day, and I've barely managed to get 2 hours real work done.

Tim Delaney