Re: Emacs' Org-mode clone for Vim

On Nov 27, 11:51 am, ZyX <zyx....@gmail.com> wrote:
>
> Performance penalty is insignificant here: the following test on my machine
> emits the following results:
> 1000000 (1e6) iterations
> dict:
>   2.491708
>   4.262242
>   6.753950
> dictdot:
>   2.194558
>   3.899753
>   6.094311
> var:
>   2.179728
>   3.792891
>   5.972619
> It is about 10% penalty when using [] syntax and only 2% when using dot syntax:
> It looks like vim is using the same hash function for both for dictionary and
> variable lookup. Here is a table created by

ZyX -- Thanks for that, definitely looks usable for me. Will migrate
to that setup, probably in steps.

I have another performance-related (but unrelated to the clean-coding-
practice issue) question about dicts that I've been wondering about.
Does the length of the name assigned to a key affect memory usage?
For example, in comparing the two dictionaries below, both of which
have 1,000,000 entries, does the long name of the key affect memory
usage?

{ 'entry_1': { 's1': 'text_for_s1'}, . . . 'entry_1000000': { 's1':
'text_for_s1'} }

{ 'entry_1': { '____________________________________s1':
'text_for_s1'}, . . . 'entry_1000000':
{ '_______________________________s1': 'text_for_s1'} }

I guess I could just do the test myself, and I guess I will now, but
if you know off the top of your head I'd be curious to hear more about
these internal storage details for dicts.

-- Herb

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