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From: Eli Zaretskii <eliz@gnu.org>
To: Dmitry Gutov <dgutov@yandex.ru>
Cc: wyuenho@gmail.com, emacs-devel@gnu.org
Subject: Re: How to measure frame rate in fps?
Date: Sun, 06 Jun 2021 09:11:00 +0300	[thread overview]
Message-ID: <83o8cjikuj.fsf@gnu.org> (raw)
In-Reply-To: <e032895f-4a6c-1463-20ff-9b4891df156a@yandex.ru> (message from Dmitry Gutov on Sun, 6 Jun 2021 05:09:09 +0300)

> Cc: wyuenho@gmail.com, emacs-devel@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sun, 6 Jun 2021 05:09:09 +0300
> 
> On 02.06.2021 05:29, Eli Zaretskii wrote:
> > Maybe run Emacs under 'perf' and see which GTK API call(s) take(s)
> > most of those milliseconds?
> 
> I'm not sure if I've been doing it right, but the gtk functions seem to 
> be taking pretty much none of the runtime:
> 
>     0,00%  emacs  libgtk-3.so.0.2404.16  [.] gtk_widget_get_direction
>     0,00%  emacs  libgtk-3.so.0.2404.16  [.] gtk_widget_get_type 
> 
>     0,00%  emacs  libgtk-3.so.0.2404.16  [.] gtk_style_context_get_property
>     0,00%  emacs  libgtk-3.so.0.2404.16  [.] gtk_get_event_widget
>     0,00%  emacs  libgtk-3.so.0.2404.16  [.] gtk_style_context_get_type
>     0,00%  emacs  libgtk-3.so.0.2404.16  [.] gtk_toolbar_get_type

Yes, looks like that.  Strange, since you did say disabling the tool
bar makes a prominent difference.

> The leaders looked like:
> 
>    28,52%  emacs         emacs                       [.] mark_object 
> 
>     6,87%  emacs         emacs                       [.] assq_no_quit 
> 
>     3,45%  emacs         emacs                       [.] mark_char_table 
> 
>     3,37%  emacs         emacs                       [.] sweep_strings 
> 
>     2,84%  emacs         emacs                       [.] boyer_moore 

Three out of 5 of the above mean Emacs spends a large proportion of
the time (35%) doing GC.  I'm not sure I understand why should Emacs
perform GC while being idle: do you have some timers running, perhaps?
If this is "emacs -Q", what happens if you disable blink-cursor-mode
and global-eldoc-mode?

>     0,25%  emacs         emacs                       [.] json_to_lisp 

Any idea why this is here?

(I think "perf report" supports output in the form of a call-tree,
where functions are shown with their callers?  That allows to better
understand what high-level processing is running in Emacs than just
looking at the profile sorted by percents.)



  reply	other threads:[~2021-06-06  6:11 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-31 13:03 How to measure frame rate in fps? Jimmy Yuen Ho Wong
2021-06-01 10:00 ` Arthur Miller
2021-06-01 11:43 ` Eli Zaretskii
2021-06-01 14:18   ` Dmitry Gutov
2021-06-01 14:43     ` Eli Zaretskii
2021-06-01 15:00       ` Dmitry Gutov
2021-06-01 15:35         ` Eli Zaretskii
2021-06-01 21:31           ` Dmitry Gutov
2021-06-02  2:29             ` Eli Zaretskii
2021-06-06  2:09               ` Dmitry Gutov
2021-06-06  6:11                 ` Eli Zaretskii [this message]
2021-06-06 12:00                   ` Dmitry Gutov
2021-06-06 12:36                     ` Eli Zaretskii
2021-06-06 16:48                       ` Dmitry Gutov
2021-06-06 17:19                         ` Eli Zaretskii
2021-06-06 23:31                           ` Dmitry Gutov
2021-06-07 12:33                             ` Eli Zaretskii
2021-06-06 18:10                         ` Stefan Monnier
2021-06-06 23:35                           ` Dmitry Gutov

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