* 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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