From: Lars Ingebrigtsen <larsi@gnus.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 22763@debbugs.gnu.org, esq@lawlist.com, monnier@iro.umontreal.ca
Subject: bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position.
Date: Sun, 07 Feb 2021 19:23:53 +0100 [thread overview]
Message-ID: <87tuqnzqh2.fsf@gnus.org> (raw)
In-Reply-To: <87y2fzzqxb.fsf@gnus.org> (Lars Ingebrigtsen's message of "Sun, 07 Feb 2021 19:14:08 +0100")
Lars Ingebrigtsen <larsi@gnus.org> writes:
>> find_newline does the same as display_count_lines: it calls memchr.
>> But it also maintains a newline cache. If you disable that cache (by
>> turning of cache-long-scans), you might see a different speedup.
>
> Shouldn't the cache speed things up?
No, you're right -- if I set `cache-long-scans' to nil and
`line-number-at-pos' in Emacs 27 becomes ~8x faster in my test, which is
currently
(with-temp-buffer
(setq cache-long-scans nil)
(dotimes (_ 1000)
(insert-file-contents "~/src/emacs/trunk/src/ChangeLog.11")
(goto-char (point-max)))
(benchmark-run 1
(dotimes (i 1000)
(goto-char (/ (buffer-size) 1000))
(line-number-at-pos (point)))))
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2021-02-07 18:23 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-22 2:42 bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position Keith David Bershatsky
2016-02-22 16:06 ` Eli Zaretskii
2021-02-07 15:07 ` Lars Ingebrigtsen
2021-02-07 15:44 ` Lars Ingebrigtsen
2021-02-07 16:07 ` Lars Ingebrigtsen
2021-02-07 17:40 ` Stefan Monnier
2021-02-07 17:45 ` Lars Ingebrigtsen
2021-02-07 18:07 ` Lars Ingebrigtsen
2021-02-07 18:09 ` Eli Zaretskii
2021-02-07 18:14 ` Lars Ingebrigtsen
2021-02-07 18:23 ` Lars Ingebrigtsen [this message]
2021-02-07 19:02 ` Eli Zaretskii
2021-02-07 19:06 ` Eli Zaretskii
2021-02-07 19:25 ` Lars Ingebrigtsen
2021-02-07 19:34 ` Lars Ingebrigtsen
2021-02-07 19:43 ` Eli Zaretskii
2021-02-07 19:42 ` Eli Zaretskii
2021-02-07 19:46 ` Lars Ingebrigtsen
2021-02-07 19:52 ` Eli Zaretskii
2021-02-07 21:52 ` Lars Ingebrigtsen
2021-02-07 21:58 ` Lars Ingebrigtsen
2021-02-08 3:34 ` Eli Zaretskii
2021-02-07 22:09 ` Philipp
2021-02-07 20:37 ` Stefan Monnier
2021-02-07 20:42 ` Lars Ingebrigtsen
2021-02-07 20:50 ` Eli Zaretskii
2021-02-07 21:36 ` Lars Ingebrigtsen
2021-02-08 15:04 ` Eli Zaretskii
2021-02-09 2:17 ` Katsumi Yamaoka
2021-02-09 7:13 ` Lars Ingebrigtsen
2021-05-19 23:55 ` Ben Levy via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-20 6:45 ` Eli Zaretskii
2021-05-20 7:27 ` Andreas Schwab
2021-05-20 7:35 ` Ben Levy via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-20 9:08 ` Eli Zaretskii
2021-05-20 9:03 ` Eli Zaretskii
2021-05-20 19:53 ` Ben Levy via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-20 20:09 ` Eli Zaretskii
2021-05-20 20:40 ` Ben Levy via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-21 5:46 ` Eli Zaretskii
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