GNU bug report logs - #15555
24.3; Bidirectional display very slow with long lines

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Package: emacs;

Reported by: Jerome L Quinn <jlquinn <at> us.ibm.com>

Date: Mon, 7 Oct 2013 20:25:01 UTC

Severity: normal

Merged with 3219, 4123, 9589, 13675, 18530, 22143, 24523, 30457, 32523, 40007

Found in versions 23.1, 24.2, 24.2.93, 24.3, 24.5, 26.0.91, 27.0.50, 28.0.50

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Full log

Message #41 received at 15555 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Antipov <dmantipov <at> yandex.ru>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 15555 <at> debbugs.gnu.org
Subject: Re: bug#15555: Re: bug#15555: 24.3; Bidirectional display very slow
 with long lines
Date: Tue, 18 Feb 2014 18:31:22 +0400

On 02/18/2014 06:04 PM, Stefan Monnier wrote:

> Eli's argument is not that bidi adds its own bottlenecks, but that there
> are sufficiently other bottlenecks that there's not much point trying to
> address bidi's bottlenecks until we start tackling the other ones.

Now I'm seeing the use case where each trivial cursor movement causes
~100 calls to bidi_shelve_cache, and each call copies ~1.5M of data.
If there is a redisplay problem which makes this unavoidable without
rewriting 1/2 of xdisp.c, then "broken by design" is the only thing
I can say about all of that mess.

Dmitry
This bug report was last modified 2 years and 305 days ago.

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