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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: Tue, 1 Jun 2021 17:18:09 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

On 01.06.2021 14:43, Eli Zaretskii wrote:
You just need to remember to include some command that
would affect the display, or else redisplay will do very little and
redraw nothing.

Speaking of redisplay redrawing nothing, as long as tool-bar-mode is on, my GTK3 build (with -Q even) evaluates (benchmark 1 '(redisplay)) to a sequence of results like this:

Elapsed time: 0.040924s
Elapsed time: 0.026343s
Elapsed time: 0.023473s
Elapsed time: 0.025162s
Elapsed time: 0.030074s
Elapsed time: 0.041305s (0.026917s in 1 GCs)
Elapsed time: 0.031169s
Elapsed time: 0.020957s
Elapsed time: 0.034885s
Elapsed time: 0.035338s
Elapsed time: 0.030864s

and with tool-bar-mode off:

Elapsed time: 0.007189s
Elapsed time: 0.006181s
Elapsed time: 0.007358s
Elapsed time: 0.004177s
Elapsed time: 0.007754s
Elapsed time: 0.007557s

Not so noticeable if it just happens once, but easily affects the performance of code which performs "virtual" redisplay, such as posn-at-point.

Sometimes the effect disappears (even with tool-bar-mode on), but to bring it back I only had to call (redisplay t) once.

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