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Re: How to measure frame rate in fps?

From: Dmitry Gutov
Subject: Re: How to measure frame rate in fps?
Date: Sun, 6 Jun 2021 15:00:50 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

On 06.06.2021 09:11, Eli Zaretskii wrote:

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.

A noticeable difference in the speed of (redisplay), as measured by benchmark-progn, in the middle of a more complex process.

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?

No, I'm not measuring while idle. Like I said, those redisplays are in the middle of the "complex" scenario mentioned previously.

Since the code path that calls (redisplay) in Company is only triggered when talking to an external process (or, more generally, when the backend does something that allows a timer to run), to test this I repeatedly exercise completion using an external service, talking to it via HTTP/JSON.

     0,25%  emacs         emacs                       [.] json_to_lisp

Any idea why this is here?

...so both JSON decoding and GC being among the hot spots are totally expected.

(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.)

Let me know if you still need some of the calls expanded this way.

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