GNU bug report logs - #30539
26.0; `char-displayable-p' is much slower in Emacs 25 and 26

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Kangas <stefan <at> marxist.se>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#30539: closed (26.0; `char-displayable-p' is much slower in
 Emacs 25 and 26)
Date: Wed, 18 Nov 2020 18:31:02 +0000

[Message part 1 (text/plain, inline)]

Your message dated Wed, 18 Nov 2020 10:30:08 -0800
with message-id <CADwFkmmtL=mZLofP_4a=0q6ro3MfDGYnLNwGVyJnaQjW-FL44w <at> mail.gmail.com>
and subject line Re: bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26
has caused the debbugs.gnu.org bug report #30539,
regarding 26.0; `char-displayable-p' is much slower in Emacs 25 and 26
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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30539: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=30539
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[Message part 2 (message/rfc822, inline)]

From: Drew Adams <drew.adams <at> oracle.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26
Date: Mon, 19 Feb 2018 14:07:40 -0800 (PST)

[Message part 3 (text/plain, inline)]

This is not from emacs -Q, and I do have many fonts installed.  I
repeated it from emacs -Q and I've attached those profiler reports
also.  But with emacs -Q the test code (`my-test') finished
immediately.  With my setup it took many seconds.  I use this font
by default - dunno whether that makes the difference:

(font . "-outline-Lucida Console-normal-normal-normal-mono-4-*-*-*-c-*-iso8859-1")
(font-parameter . "-*-Lucida Console-normal-r-*-*-14-*-*-*-c-*-iso8859-1")

Recipe I followed:

Evaluate the attached code (`throw-mule-bug.el'), then look at buffers
*CPU Profiler Report* and *Memory Profiler Report*.  I've attached these
reports as files:

throw-mule-bug-memory-report-E26-Q - Emacs 26 from emacs -Q
throw-mule-bug-cpu-report-E26-Q    - Emacs 26 from emacs -Q
throw-mule-bug-memory-report-E24 - Emacs 24.5 with my setup
throw-mule-bug-cpu-report-E24    - Emacs 24.5 with my setup
throw-mule-bug-memory-report-E26 - Emacs 26P2 with my setup
throw-mule-bug-cpu-report-E26    - Emacs 26P2 with my setup
 
In Emacs 25.3.1 and 26 `char-displayable-p' is MUCH slower
than it is in Emacs 24.5.  In 24.5 the evaluation of `my-test'
seems instantaneous.  In Emacs 26 it takes many seconds.

From the reports, using my setup:

E26 memory:

- my-delete-if-not                         225,165,075  52%
 - let                                     222,218,069  51%
  - while                                  222,218,069  51%
   - if                                    222,218,069  51%
    - not                                  222,218,069  51%
     - funcall                             222,218,069  51%
      - my-char-displayable-p              222,218,069  51%
       - char-displayable-p                222,218,069  51%
        - cond                             222,218,069  51%
           let                             189,022,646  43%
 - while                                     2,947,006   0%
  - and                                      2,947,006   0%
   - not                                     2,947,006   0%
    - funcall                                2,947,006   0%
     - my-char-displayable-p                 2,947,006   0%
      - char-displayable-p                   2,947,006   0%
       - cond                                2,947,006   0%
          let                                1,836,898   0%

E26 cpu:

- my-delete-if-not                                1609  70%
 - let                                            1602  70%
  - while                                         1602  70%
   - if                                           1602  70%
    - not                                         1602  70%
     - funcall                                    1602  70%
      - my-char-displayable-p                     1602  70%
       - char-displayable-p                       1602  70%
        - cond                                    1602  70%
           let                                    1602  70%
 - while                                             7   0%
  - and                                              7   0%
   - not                                             7   0%
    - funcall                                        7   0%
     - my-char-displayable-p                         7   0%
      - char-displayable-p                           7   0%
       - cond                                        7   0%
          let                                        7   0%

In GNU Emacs 26.0.91 (build 1, x86_64-w64-mingw32)
 of 2018-01-22
Repository revision: 752fba992b793a74d202c9cfc3e1a92fd458e748
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''

[throw-mule-bug-cpu-report-E26 (application/octet-stream, attachment)]

[throw-mule-bug-memory-report-E26-Q (application/octet-stream, attachment)]

[throw-mule-bug-cpu-report-E26-Q (application/octet-stream, attachment)]

[throw-mule-bug-memory-report-E24 (application/octet-stream, attachment)]

[throw-mule-bug-cpu-report-E24 (application/octet-stream, attachment)]

[throw-mule-bug-memory-report-E26 (application/octet-stream, attachment)]

[throw-mule-bug.el (application/octet-stream, attachment)]

[Message part 11 (message/rfc822, inline)]

From: Stefan Kangas <stefan <at> marxist.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: npostavs <at> gmail.com, 30539-done <at> debbugs.gnu.org
Subject: Re: bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25
 and 26
Date: Wed, 18 Nov 2020 10:30:08 -0800

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Stefan Kangas <stefan <at> marxist.se>
>> Date: Wed, 18 Nov 2020 07:35:06 -0800
>> Cc: 30539 <at> debbugs.gnu.org
>>
>> > Doing (setq inhibit-compacting-font-caches t) brings back reasonable
>> > performance.
>> >
>> > I can't reproduce on my GNU/Linux box, although that may just be due to
>> > different fonts installed.  In particular, char-displayable-p never gave
>> > me nil.
>>
>> Given this change:
>>
>> commit f34f49f35e5c000a6ee070678f43d2ca38b76cad
>> Author: Eli Zaretskii <eliz <at> gnu.org>
>> Date:   Sat Sep 7 12:26:08 2019 +0300
>>
>>     Set inhibit-compacting-font-caches to t by default on MS-Windows
>>
>> Is there anything left to do here, or should this bug be closed?
>
> If the problem doesn't happen on GNU/Linux, we can close this.

I think this is Windows specific indeed.  Closing.

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