[Python-Dev] Compact dict implementations (was: PEP 468

[INADA Naoki]

>
> Ordered, or just initially ordered? I mean, "ordered if no deletion".
>

I implemented "ordered".  Because:

* "orderd" is easier to explain than "ordered if no deletion".

* I don't want to split sparse index hash and dense entry array.
  In case of very small dict, index hash (8byte) and first two entries
(24*2=48byte)
  can be on one cache line.

* Easy to implement "split dictionary" (aka. key sharing dictionary).

You can see what I implemented in here.
https://github.com/methane/cpython/pull/1/files

-- 
INADA Naoki  <songofacandy at gmail.com>