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Re: Current mode command discovery
From: |
Lars Ingebrigtsen |
Subject: |
Re: Current mode command discovery |
Date: |
Thu, 18 Feb 2021 15:06:22 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Dmitry Gutov <dgutov@yandex.ru> writes:
> On 18.02.2021 12:14, Lars Ingebrigtsen wrote:
>> I guess the main performance difference is in loading the .elc files --
>> parsing and applying all the `put's.
>
> Hm. Are you saying that the use of (declare (completion ...)) form
> currently requires us to parse all .elc files?
No -- I'm saying that I guess the M-x completion performance difference
is probably very small between the two approaches. The current approach
is to stash the data in the bytecode object and retrieving it with
`command-modes' vs. doing `get' on the symbol. `command-modes' is O(1)
and `get' is O(n), but the n is so small on typical symbols that I doubt
there's much of a measurable difference. And `get' has a bytecode
opcode, so it may even be faster for all I know.
But I haven't measured.
The disadvantage in using a `put' for this data is mainly in that it
makes .elc files larger (and therefore slower to load).
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- Re: Current mode command discovery, (continued)
- Re: Current mode command discovery, Matt Armstrong, 2021/02/14
- Re: Current mode command discovery, Óscar Fuentes, 2021/02/16
- Re: Current mode command discovery, Dmitry Gutov, 2021/02/17
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/17
- Re: Current mode command discovery, Dmitry Gutov, 2021/02/17
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/17
- Re: Current mode command discovery, Dmitry Gutov, 2021/02/17
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/18
- Re: Current mode command discovery, Dmitry Gutov, 2021/02/18
- Re: Current mode command discovery,
Lars Ingebrigtsen <=
- Re: Current mode command discovery, Dmitry Gutov, 2021/02/18
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/19
- Re: Current mode command discovery, Eli Zaretskii, 2021/02/19
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/19
- Re: Current mode command discovery, Eli Zaretskii, 2021/02/19
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/19
- Re: Current mode command discovery, Eli Zaretskii, 2021/02/19
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/19
- Re: Current mode command discovery, Eli Zaretskii, 2021/02/19
- Re: Current mode command discovery, Lars Ingebrigtsen, 2021/02/19