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* Redisplay slower in Emacs 28 than Emacs 27
@ 2020-12-07 14:53 Gregory Heytings via Emacs development discussions.
  2020-12-07 15:04 ` Lars Ingebrigtsen
  2020-12-07 15:21 ` Jean Louis
  0 siblings, 2 replies; 82+ messages in thread
From: Gregory Heytings via Emacs development discussions. @ 2020-12-07 14:53 UTC (permalink / raw)
  To: emacs-devel

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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.

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^ permalink raw reply	[flat|nested] 82+ messages in thread

end of thread, other threads:[~2020-12-10 16:21 UTC | newest]

Thread overview: 82+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
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

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