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Re: Q on performance with 10000 faces
From: |
Stefan Monnier |
Subject: |
Re: Q on performance with 10000 faces |
Date: |
Mon, 22 May 2006 08:59:13 -0400 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) |
>> Does this mean that Emacs cannot reasonably be expected to
>> display 10000 face text-properties?
> AFAIK, yes. Doing what you did (a) disables all possible display
> optimizations that the redisplay engine has up its sleeve to speed up
> the common cases,
Indeed, changes in the face property take time. I wouldn't say that what
he describes disables any particular optimization, but it makes
them ineffective.
> and (b) forces Emacs to traverse the 10000 text
> properties for each character it is about to display.
I don't see why the redisplay would have to traverse 10000 text properties
for each char it is about to display. After all, there are 10000 chars each
with a different face property, but each one only has one text property (or
maybe a couple, but not 10000).
> Don't do what? Use that many faces or something else also?
It could be either don't use that many face-changes, or don't use that
many faces. I suspect that the number of faces is what bogs you down which
is why it also slows down redisplay of other windows. But I'm very
non-knowledgeable about the redisplay code.
> It's because even cursor motion, that usually takes a fast shortcut
> through the redisplay code, requires to search all the text properties
> in your situation.
I don't see why that'd be the case.
> I'm a little surprised that a frame that is not selected and has no current
> activity (no cursor motion etc.), would continue to slow Emacs down just by
> being displayed on the computer screen (and listening for input).
Agreed. I think there is a missing redisplay optimization here (and
I suspect that I sometimes suffer from a related missing optimization when
I have 100 frames open).
Stefan
- Q on performance with 10000 faces, Drew Adams, 2006/05/21
- Re: Q on performance with 10000 faces, Eli Zaretskii, 2006/05/22
- Re: Q on performance with 10000 faces, Eli Zaretskii, 2006/05/22
- RE: Q on performance with 10000 faces, Drew Adams, 2006/05/22
- RE: Q on performance with 10000 faces, Drew Adams, 2006/05/22
- Re: Q on performance with 10000 faces, Kevin Rodgers, 2006/05/22
- RE: Q on performance with 10000 faces, Drew Adams, 2006/05/22
- Re: Q on performance with 10000 faces, Luc Teirlinck, 2006/05/22
- RE: Q on performance with 10000 faces, Drew Adams, 2006/05/22