* bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets
[not found] <834mv55quj.fsf@gnu.org>
@ 2014-10-20 19:17 ` Ivan Shmakov
2014-10-20 19:33 ` Eli Zaretskii
0 siblings, 1 reply; 6+ messages in thread
From: Ivan Shmakov @ 2014-10-20 19:17 UTC (permalink / raw)
To: 18778
Package: emacs
X-Debbugs-Cc: Eli Zaretskii <eliz@gnu.org>
>>>>> Eli Zaretskii <eliz@gnu.org> writes:
[…]
> In addition, one of the new UBA features, the so-called Bidirectional
> Parentheses Algorithm (BPA), affects pure-ASCII text as well, and
> specifically editing of program sources (which widely use parentheses
> and brackets of several kinds).
> The result is some small slowdown -- a few percents in my testing --
> in redisplay operations. If more significant slowdown will be
> reported in some special cases, I will try to find optimizations to
> countermand that.
It seems that I’ve just found such a case for 13a3ad6b39c0.
To reproduce:
• create a buffer with long lines (see below for the example
I’ve used), and (setq word-wrap t line-move-visual nil) there;
• now, enclose every line in [, ] brackets (as in: M-x
replace-regexp RET .* RET [\&] RET; parentheses or curly
braces also exhibit the issue.)
For the resulting buffer, operations like (next-line) or even
(recenter) now result in a noticeable delay.
The issue doesn’t appear when word-wrap is not used, or when
there’s no brackets in the buffer. Neither the issue appears in
Emacs built 2014-10-09 from a then-recent Git clone.
I’ve used the output of the following Shell command as a test.
$ head -n 8192 < /usr/share/dict/american-english | fmt -w 1024
[…]
--
FSF associate member #7257 http://boycottsystemd.org/ … 3013 B6A0 230E 334A
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets
2014-10-20 19:17 ` bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets Ivan Shmakov
@ 2014-10-20 19:33 ` Eli Zaretskii
2014-10-20 19:51 ` Ivan Shmakov
0 siblings, 1 reply; 6+ messages in thread
From: Eli Zaretskii @ 2014-10-20 19:33 UTC (permalink / raw)
To: Ivan Shmakov; +Cc: 18778
> From: Ivan Shmakov <ivan@siamics.net>
> Date: Mon, 20 Oct 2014 19:17:28 +0000
>
> • create a buffer with long lines (see below for the example
> I’ve used), and (setq word-wrap t line-move-visual nil) there;
>
> • now, enclose every line in [, ] brackets (as in: M-x
> replace-regexp RET .* RET [\&] RET; parentheses or curly
> braces also exhibit the issue.)
>
> For the resulting buffer, operations like (next-line) or even
> (recenter) now result in a noticeable delay.
>
> The issue doesn’t appear when word-wrap is not used, or when
> there’s no brackets in the buffer. Neither the issue appears in
> Emacs built 2014-10-09 from a then-recent Git clone.
>
> I’ve used the output of the following Shell command as a test.
>
> $ head -n 8192 < /usr/share/dict/american-english | fmt -w 1024
Is it an important use case? If so, what is the real-life situation
here?
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets
2014-10-20 19:33 ` Eli Zaretskii
@ 2014-10-20 19:51 ` Ivan Shmakov
2014-10-22 16:12 ` Eli Zaretskii
0 siblings, 1 reply; 6+ messages in thread
From: Ivan Shmakov @ 2014-10-20 19:51 UTC (permalink / raw)
To: 18778
[-- Attachment #1: Type: text/plain, Size: 1474 bytes --]
>>>>> Eli Zaretskii <eliz@gnu.org> writes:
>>>>> From: Ivan Shmakov <ivan@siamics.net>
[…]
>> For the resulting buffer, operations like (next-line) or even
>> (recenter) now result in a noticeable delay.
>> The issue doesn’t appear when word-wrap is not used, or when there’s
>> no brackets in the buffer. Neither the issue appears in Emacs built
>> 2014-10-09 from a then-recent Git clone.
>> I’ve used the output of the following Shell command as a test.
>> $ head -n 8192 < /usr/share/dict/american-english | fmt -w 1024
> Is it an important use case?
Is there any example of content for which using word-wrap would
be reasonable, but which will never ever contain any braces?
> If so, what is the real-life situation here?
For one thing, MediaWiki (as in: Wikipedia) pages tend to use
paragraph-long lines, and (just as any other human-readable text
usually does) they use various braces more than occasionally;
not to mention using [, ], {, } for the markup purposes. (A few
initial lines of the https://en.wikipedia.org/wiki/Emacs page
source are MIMEd.)
Using word-wrap when editing such pages is also more or less an
obvious measure.
(Now, for sure, I can try to mass-edit the pages I’m interested
in to fit in 80 columns, but I doubt such a move would receive a
warm welcome from the community.)
--
FSF associate member #7257 http://boycottsystemd.org/ … 3013 B6A0 230E 334A
[-- Attachment #2: Type: text/mediawiki, Size: 981 bytes --]
{{Distinguish|eMac}}
[[File:Emacs Dired buffers.png|thumb|Editing multiple [[Dired]] buffers in [[GNU Emacs]]]]
'''Emacs''' {{IPAc-en|ˈ|iː|m|æ|k|s}} and its derivatives are a family of [[text editor]]s that are characterized by their [[extensibility]]. The manual for the most widely-used variant, [[GNU Emacs]], describes it as "the extensible, customizable, self-documenting, real-time display editor".<ref>{{cite web|title=GNU Emacs Manual|url=https://www.gnu.org/software/emacs/manual/html_node/emacs/index.html|work=GNU Emacs Manual|publisher=FSF|accessdate=24 November 2012}}</ref> Development of the first Emacs began in the mid-1970s and continues actively {{as of|2014|lc=on}}. Emacs has over 2,000 built-in commands and allows the user to combine these commands into [[macro (computer science)|macros]] to automate work. The use of [[Emacs Lisp]], a variant of the [[Lisp (programming language)|Lisp]] programming language, provides a deep extension capability.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets
2014-10-20 19:51 ` Ivan Shmakov
@ 2014-10-22 16:12 ` Eli Zaretskii
2014-10-22 17:07 ` Ivan Shmakov
2014-10-29 19:31 ` Ivan Shmakov
0 siblings, 2 replies; 6+ messages in thread
From: Eli Zaretskii @ 2014-10-22 16:12 UTC (permalink / raw)
To: Ivan Shmakov; +Cc: 18778
In trunk revision 118179 I introduced an optimization that fixes these
situations.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets
2014-10-22 16:12 ` Eli Zaretskii
@ 2014-10-22 17:07 ` Ivan Shmakov
2014-10-29 19:31 ` Ivan Shmakov
1 sibling, 0 replies; 6+ messages in thread
From: Ivan Shmakov @ 2014-10-22 17:07 UTC (permalink / raw)
To: 18778
>>>>> Eli Zaretskii <eliz@gnu.org> writes:
> In trunk revision 118179 I introduced an optimization that fixes
> these situations.
ACK, thanks. (I don’t currently plan upgrading my Emacs
instance before early next week, thus I won’t be able to test
them myself until then either.)
--
FSF associate member #7257 http://boycottsystemd.org/ … 3013 B6A0 230E 334A
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets
2014-10-22 16:12 ` Eli Zaretskii
2014-10-22 17:07 ` Ivan Shmakov
@ 2014-10-29 19:31 ` Ivan Shmakov
1 sibling, 0 replies; 6+ messages in thread
From: Ivan Shmakov @ 2014-10-29 19:31 UTC (permalink / raw)
To: 18778-done
>>>>> Eli Zaretskii <eliz@gnu.org> writes:
> In trunk revision 118179 I introduced an optimization that fixes
> these situations.
As of 4fd1634dbdd8, I no longer observe this issue, thus closing
this bug.
Thanks again.
--
FSF associate member #7257 http://boycottsystemd.org/ … 3013 B6A0 230E 334A
^ permalink raw reply [flat|nested] 6+ messages in thread
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[not found] <834mv55quj.fsf@gnu.org>
2014-10-20 19:17 ` bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets Ivan Shmakov
2014-10-20 19:33 ` Eli Zaretskii
2014-10-20 19:51 ` Ivan Shmakov
2014-10-22 16:12 ` Eli Zaretskii
2014-10-22 17:07 ` Ivan Shmakov
2014-10-29 19:31 ` Ivan Shmakov
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