From: charles@aurox.ch (Charles A. Roelli)
To: Drew Adams <drew.adams@oracle.com>
Cc: 30539@debbugs.gnu.org
Subject: bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26
Date: Wed, 28 Feb 2018 20:21:44 +0100 [thread overview]
Message-ID: <m2d10oj4xj.fsf@aurox.ch> (raw)
In-Reply-To: <ec3497d7-9a7d-4be8-8712-19bb6bdd96e8@default> (message from Drew Adams on Tue, 20 Feb 2018 10:08:36 -0800 (PST))
> Date: Tue, 20 Feb 2018 10:08:36 -0800 (PST)
> From: Drew Adams <drew.adams@oracle.com>
>
> Sorry, the recipe I sent before was not good. The initial
> alist of chars had already been purged of any chars that
> are not `char-displayable-p'.
>
> Please try attached file `throw-mule-bug-2.el' instead.
> This time the alist of chars in variable `char-names'
> includes some chars that are not `char-displayable-p'.
> Evaluating `char-displayable-p' for those chars is, I
> think, where the bottleneck is.
>
> Evaluate the code in `throw-mule-bug-2.el' and then check
> buffers *CPU Profiler Report* and *Memory Profiler Report*.
>
> I've attached those reports as these files:
>
> throw-mule-bug-cpu-report2-E24-Q - Emacs 24.5 from `emacs -Q'
> throw-mule-bug-mem-report2-E24-Q - Emacs 24.5 from `emacs -Q'
> throw-mule-bug-cpu-report2-E26-Q - Emacs 26P2 from `emacs -Q'
> throw-mule-bug-mem-report2-E26-Q - Emacs 26P2 from `emacs -Q'
>
> You can see these reports by using `M-x profiler-find-profile'
> and entering the report file name at the prompt.
>
> In Emacs 24.5 evaluating `(my-test)' takes only a few _seconds_.
> In Emacs 26 (Pretest 2) it takes about 13 _minutes_.
>
> Emacs 25.3.1 has the same problem as Emacs 26.
FWIW, on macOS 10.6, evaluating (my-test) the first time takes
~4.7 seconds, then further runs take about 0.01 seconds. Setting
inhibit-compacting-font-caches to `t' seems to have no effect on
evaluation time in either case.
But I have noticed that displaying files containing certain Unicode
characters can lock Emacs for a little while. I wonder if that is
also some manifestation of this bug. Do you also see a slow down when
you visit a file containing the characters in the `char-names'
variable you defined? Or is the slowness limited to running them
through `char-displayable-p'?
next prev parent reply other threads:[~2018-02-28 19:21 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-19 22:07 bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26 Drew Adams
2018-02-20 18:08 ` Drew Adams
2018-02-22 14:50 ` Drew Adams
2018-02-23 1:49 ` Noam Postavsky
2018-02-23 2:43 ` Drew Adams
2018-02-23 3:32 ` Noam Postavsky
2018-02-23 4:07 ` Drew Adams
2018-02-23 7:14 ` Eli Zaretskii
2020-06-27 21:34 ` Drew Adams
2020-11-18 15:35 ` Stefan Kangas
2020-11-18 17:21 ` Eli Zaretskii
2020-11-18 18:30 ` Stefan Kangas
2018-02-28 19:21 ` Charles A. Roelli [this message]
[not found] <<8c79c39f-7abb-4591-a676-17fb46af5a8f@default>
[not found] ` <<ec3497d7-9a7d-4be8-8712-19bb6bdd96e8@default>
[not found] ` <<m2d10oj4xj.fsf@aurox.ch>
2018-02-28 19:53 ` Drew Adams
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