From: Alan Mackenzie <acm@muc.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%
Date: Sat, 4 Sep 2021 15:32:57 +0000 [thread overview]
Message-ID: <YTORqWPX9lEyOBZ9@ACM> (raw)
In-Reply-To: <jwvk0jwie0b.fsf-monnier+emacs@gnu.org>
Hello, Stefan.
On Sat, Sep 04, 2021 at 11:00:53 -0400, Stefan Monnier wrote:
> > , it takes 27.9s. So it would seem the cost of having a jit-lock
> > function returning a jit-lock-bounds structure when it's not the first
> > function is high. That's using the strategy of a full refontification of
> > the "extra" regions of the buffer returned in that structure.
> How does it compare to the performance with the old/current
> jit-lock code?
That takes ~22.6s.
> > Maybe that strategy is not optimal.
> I think it leads to many calls to the client functions with small
> regions, which for font-lock at least is not optimal indeed.
> Maybe to speed things up, another option is to grow the chunk size
> a bit.
Maybe. An advantage of a small chunk size is that fontifying a single
screen can be done with a maximum 499 bytes "inefficiency" off the end
of a screen. If we were to increase jit-lock-chunk-size to, say 2000,
more of the next screen would be getting fontified, perhaps wastefully.
I don't know how important this is. Maybe I should try it.
Indeed. With jit-lock-chunk-size at 2000, time-scroll on xdisp.c takes:
(current code): 16.4s
(new proposed code): 16.1s
.. This speed up may well be particular to CC Mode.
Let's try jit-lock-chunk-size at 8000:
(current code): 15.1s
(new proposed code): 15.1s
.. So, yes, it would seem a larger chunk size is advantageous for CC
Mode. In Emacs Lisp Mode, scrolling through jit-lock.el takes:
(500): 0.195s
(8000): 0.184s
.. So the advantage of a bigger chunk size is less marked, here.
Maybe we should consider increasing the default jit-lock-chunk-size.
> Stefan
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2021-09-04 15:32 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 17:33 bug-reference-prog-mode slows down CC Mode's scrolling by ~7% Alan Mackenzie
2021-09-01 17:44 ` Eli Zaretskii
2021-09-01 17:55 ` Alan Mackenzie
2021-09-01 18:01 ` Eli Zaretskii
2021-09-01 18:20 ` Alan Mackenzie
2021-09-01 18:28 ` Eli Zaretskii
2021-09-01 19:19 ` Alan Mackenzie
2021-09-01 20:59 ` Stefan Monnier
2021-09-02 6:26 ` Eli Zaretskii
2021-09-02 16:57 ` Alan Mackenzie
2021-09-02 18:46 ` Stefan Monnier
2021-09-02 19:24 ` Alan Mackenzie
2021-09-02 21:08 ` Alan Mackenzie
2021-09-03 6:16 ` Eli Zaretskii
2021-09-03 12:30 ` Stefan Monnier
2021-09-03 12:38 ` Eli Zaretskii
2021-09-03 22:25 ` Stefan Monnier
2021-09-04 6:13 ` Eli Zaretskii
2021-09-04 13:36 ` Stefan Monnier
2021-09-04 13:55 ` Eli Zaretskii
2021-09-04 14:44 ` Stefan Monnier
2021-09-04 14:56 ` Eli Zaretskii
2021-09-04 15:55 ` Stefan Monnier
2021-09-04 16:12 ` Eli Zaretskii
2021-09-04 16:24 ` Stefan Monnier
2021-09-04 16:28 ` Eli Zaretskii
2021-09-04 16:40 ` Stefan Monnier
2021-09-03 6:10 ` Eli Zaretskii
2021-09-03 10:47 ` Alan Mackenzie
2021-09-03 11:24 ` Eli Zaretskii
2021-09-03 16:15 ` Alan Mackenzie
2021-09-03 12:27 ` Stefan Monnier
2021-09-03 12:19 ` Stefan Monnier
2021-09-03 12:35 ` Eli Zaretskii
2021-09-03 16:52 ` Alan Mackenzie
2021-09-03 20:51 ` Alan Mackenzie
2021-09-04 6:09 ` Eli Zaretskii
2021-09-04 14:50 ` Alan Mackenzie
2021-09-04 15:00 ` Stefan Monnier
2021-09-04 15:32 ` Alan Mackenzie [this message]
2021-09-04 15:36 ` Eli Zaretskii
2021-09-04 15:43 ` Alan Mackenzie
2021-09-04 15:48 ` Eli Zaretskii
2021-09-04 16:05 ` Alan Mackenzie
2021-09-04 16:15 ` Eli Zaretskii
2021-09-06 10:46 ` Alan Mackenzie
2021-09-06 11:10 ` Eli Zaretskii
2021-09-06 19:08 ` Alan Mackenzie
2021-09-06 19:23 ` Eli Zaretskii
2021-09-18 11:37 ` Alan Mackenzie
2021-09-18 11:59 ` Eli Zaretskii
2021-09-06 21:59 ` andrés ramírez
2021-09-07 19:47 ` Alan Mackenzie
2021-09-07 17:57 ` andrés ramírez
2021-09-06 13:24 ` Stefan Monnier
2021-09-04 16:06 ` Stefan Monnier
2021-09-04 16:23 ` Eli Zaretskii
2021-09-04 16:39 ` Stefan Monnier
2021-09-04 17:19 ` Eli Zaretskii
2021-09-04 17:47 ` Stefan Monnier
2021-09-04 18:10 ` Eli Zaretskii
2021-09-04 18:40 ` Stefan Monnier
2021-09-11 12:49 ` Eli Zaretskii
2021-09-11 17:04 ` Stefan Monnier
2021-09-11 17:17 ` Eli Zaretskii
2021-09-11 18:00 ` Stefan Monnier
2021-09-11 18:16 ` Eli Zaretskii
2021-09-11 19:55 ` Stefan Monnier
2021-09-12 3:51 ` Eli Zaretskii
2021-09-12 16:41 ` Stefan Monnier
2021-09-12 16:53 ` Eli Zaretskii
2021-09-12 17:41 ` Stefan Monnier
2021-09-12 17:55 ` Eli Zaretskii
2021-09-12 21:11 ` Stefan Monnier
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