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bug#21028: Performance regression in revision af1a69f4d17a482c359d98c00e


From: Clément Pit--Claudel
Subject: bug#21028: Performance regression in revision af1a69f4d17a482c359d98c00ef86fac835b5fac (Apr 2014).
Date: Sat, 23 Jul 2016 16:50:04 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 2016-07-21 10:21, Eli Zaretskii wrote:
>> Cc: dmantipov@yandex.ru, 21028@debbugs.gnu.org
>> From: Clément Pit--Claudel <clement.pitclaudel@live.com>
>> Date: Wed, 20 Jul 2016 17:26:02 -0400
>>
>> I've made more progress towards making this reproducible, too. My current 
>> repro requires XITS Math 
>> (https://github.com/khaledhosny/xits-math/blob/master/xits-mathbold.otf), 
>> and Segoe UI Emoji.  Do you have a machine with that font? If so, could you 
>> try the following?
>>
>>     emacs-24.5 -Q -mm -l 21028.el 21028 -f prettify-symbols-mode
>>
>> I've attached 21028.el and 21028. When I run this command, each full 
>> redisplay takes about 5 seconds; same for pointer motion.
> 
> Thanks.  I think the evidence and the profiling data you presented
> quite clearly indicate where the problem is.  So I think the efforts
> should now be directed towards reproducing bug#17125 and then solving
> it in some other way that doesn't suffer from performance problems.

I have tried the recipe posted in 17125, but I cannot reproduce it (despite 
having reverted af1a69f4d17a482c359d98c00ef86fac835b5fac).
Dmitry, is this the right recipe?

  $ emacs -no-site-file -no-init-file --daemon=test

  Warning: due to a long standing Gtk+ bug
  http://bugzilla.gnome.org/show_bug.cgi?id=85715
  Emacs might crash when run in daemon mode and the X11 connection is 
unexpectedly lost.
  Using an Emacs configured with --with-x-toolkit=lucid does not have this 
problem.
  Starting Emacs daemon.

  $ emacsclient -nc -s test
  (exit with C-x 5 0)

  $ emacsclient -nc -s test
  (exit with C-x 5 0)

  $ emacsclient -nc -s test
  (exit with C-x 5 0)

Cheers,
Clément.

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