From: Jean Louis <bugs@gnu.support>
To: Gregory Heytings <ghe@sdf.org>
Cc: emacs-devel@gnu.org
Subject: Re: Redisplay slower in Emacs 28 than Emacs 27
Date: Mon, 7 Dec 2020 18:21:50 +0300 [thread overview]
Message-ID: <X85IjhKyDu5P7U56@protected.rcdrun.com> (raw)
In-Reply-To: <alpine.NEB.2.22.394.2012071512070453.19376@sdf.lonestar.org>
* Gregory Heytings via "Emacs development discussions. <emacs-devel@gnu.org> [2020-12-07 17:55]:
>
> Following the "The Emacs master is much slower than the emacs-27 branch."
> thread, I tested Alan's benchmark on the master branch. The platform I used
> is a 64-bit GNU/Linux computer, with GCC 10.2.
>
> It turns out that the 10-15% slowdown of redisplay in Emacs 28, compared to
> Emacs 27, is due to a single character change, namely the "!" character
> removed in commit 165fd028.
>
> I attach three graphs of the timings calculated on various revisions of
> master. The benchmark ran ten times on each revision; Emacs was compiled
> with CFLAGS='-O2'. "timing-1.png" shows that the slowdown happens between
> revision 68ff32a5 and 7445560d, "timing-2.png" narrows this to revisions
> 4c5043c5 to d3c73fbf, and "timing-3.png" identifies revision 165fd028 as the
> cause of the problem.
Great work! You may also document how you did that and maybe other
people can help in debugging this way "what went wrong".
prev parent reply other threads:[~2020-12-07 15:21 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-07 14:53 Redisplay slower in Emacs 28 than Emacs 27 Gregory Heytings via Emacs development discussions.
2020-12-07 15:04 ` Lars Ingebrigtsen
2020-12-07 15:14 ` Gregory Heytings via Emacs development discussions.
2020-12-07 15:19 ` Lars Ingebrigtsen
2020-12-07 15:28 ` Gregory Heytings via Emacs development discussions.
2020-12-07 15:41 ` Lars Ingebrigtsen
2020-12-07 15:43 ` Gregory Heytings via Emacs development discussions.
2020-12-07 15:45 ` Gregory Heytings via Emacs development discussions.
2020-12-07 16:14 ` Lars Ingebrigtsen
2020-12-07 16:46 ` Gregory Heytings via Emacs development discussions.
2020-12-07 17:30 ` Eli Zaretskii
2020-12-07 18:45 ` Gregory Heytings via Emacs development discussions.
2020-12-07 18:47 ` Lars Ingebrigtsen
2020-12-07 18:49 ` Gregory Heytings via Emacs development discussions.
2020-12-07 20:58 ` Alan Third
2020-12-07 21:24 ` Gregory Heytings via Emacs development discussions.
2020-12-07 21:06 ` Gregory Heytings via Emacs development discussions.
2020-12-07 21:15 ` Lars Ingebrigtsen
2020-12-07 21:23 ` Alan Third
2020-12-07 21:31 ` Lars Ingebrigtsen
2020-12-07 21:47 ` Lars Ingebrigtsen
2020-12-07 21:46 ` Gregory Heytings via Emacs development discussions.
2020-12-07 21:49 ` Gregory Heytings via Emacs development discussions.
2020-12-07 21:59 ` Lars Ingebrigtsen
2020-12-07 22:11 ` Lars Ingebrigtsen
2020-12-07 22:56 ` Gregory Heytings via Emacs development discussions.
2020-12-07 23:02 ` Lars Ingebrigtsen
2020-12-07 23:09 ` Gregory Heytings via Emacs development discussions.
2020-12-07 23:44 ` Lars Ingebrigtsen
2020-12-07 23:47 ` Lars Ingebrigtsen
2020-12-08 0:04 ` Gregory Heytings via Emacs development discussions.
2020-12-07 23:48 ` Lars Ingebrigtsen
2020-12-08 0:17 ` Gregory Heytings via Emacs development discussions.
2020-12-08 0:23 ` Lars Ingebrigtsen
2020-12-08 0:41 ` Lars Ingebrigtsen
2020-12-08 1:21 ` Lars Ingebrigtsen
2020-12-08 17:21 ` João Távora
2020-12-08 14:58 ` Eli Zaretskii
2020-12-08 15:07 ` Lars Ingebrigtsen
2020-12-08 15:19 ` Lars Ingebrigtsen
2020-12-08 16:17 ` Eli Zaretskii
2020-12-08 16:34 ` Lars Ingebrigtsen
2020-12-08 16:56 ` Eli Zaretskii
2020-12-08 17:52 ` Lars Ingebrigtsen
2020-12-08 16:11 ` Eli Zaretskii
2020-12-07 22:23 ` Alan Third
2020-12-07 22:32 ` Lars Ingebrigtsen
2020-12-07 18:50 ` Lars Ingebrigtsen
2020-12-07 19:26 ` Eli Zaretskii
2020-12-08 14:06 ` Lars Ingebrigtsen
2020-12-08 15:50 ` Eli Zaretskii
2020-12-08 15:56 ` Stefan Monnier
2020-12-08 16:21 ` Eli Zaretskii
2020-12-08 16:31 ` Lars Ingebrigtsen
2020-12-08 16:53 ` Eli Zaretskii
2020-12-08 17:29 ` Lars Ingebrigtsen
2020-12-08 17:36 ` Eli Zaretskii
2020-12-08 17:51 ` Lars Ingebrigtsen
2020-12-08 18:03 ` Eli Zaretskii
2020-12-08 18:39 ` Stefan Monnier
2020-12-08 19:12 ` Lars Ingebrigtsen
2020-12-08 19:36 ` Lars Ingebrigtsen
2020-12-08 20:21 ` Eli Zaretskii
2020-12-08 20:32 ` Lars Ingebrigtsen
2020-12-08 20:35 ` Lars Ingebrigtsen
2020-12-08 20:51 ` Lars Ingebrigtsen
2020-12-08 21:10 ` Alfred M. Szmidt
2020-12-08 21:41 ` Lars Ingebrigtsen
2020-12-08 22:31 ` Alfred M. Szmidt
2020-12-08 21:33 ` Stefan Monnier
2020-12-08 22:46 ` Stefan Monnier
2020-12-08 22:58 ` Lars Ingebrigtsen
2020-12-08 23:10 ` Stefan Monnier
2020-12-08 23:43 ` Lars Ingebrigtsen
2020-12-09 18:49 ` Eli Zaretskii
2020-12-09 21:01 ` Stefan Monnier
2020-12-10 3:36 ` Eli Zaretskii
2020-12-10 16:21 ` Stefan Monnier
2020-12-07 16:06 ` Óscar Fuentes
2020-12-07 16:15 ` Gregory Heytings via Emacs development discussions.
2020-12-07 16:16 ` Eli Zaretskii
2020-12-07 15:21 ` Jean Louis [this message]
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