Re: Question about üarent-frame changes

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> Robert Pluim <rpluim@gmail.com> writes:
>
>>     martin> Reparenting is useful because you can set up one child frame for some
>>     martin> special purpose, make it invisible when you don't need it, and move it
>>     martin> to another frame and make it visible there whenever you want to.  On
>>     martin> GUIs, this approach has the advantage that you can avoid the (at least
>>     martin> here) costly process of setting up frame faces every time anew.  Emacs
>>     martin> tooltips do that by default and I recall that showing a tooltip every
>>     martin> time incurred two entire GC cycles here.
>>
>> Would setting up frame faces be that expensive on tty? Iʼd really love
>> to have tty child frames, even if they were not blazingly fast.
>
>> From what I've seen so far, it's pretty fast, but OTOH my machine is
> pretty fast (M1 pro). Let's see how it does when I'm a bit further. At
> least hiding frames on ttys should be there before I can really try it
> with posframe. Maybe also moving/resizing also.

I think I can say now that it will probably be faster than on GUI, at
least on macOS. Running

  (defun my-make-child ()
    (interactive)
    (make-frame `((parent-frame . ,(selected-frame))
                  (background-color . "gray10")
                  (foreground-color . "white")
                  (top . 15)
                  (left . 40)
                  (width . 80)
                  (height . 25))))

  (defun my-time-child ()
    (interactive)
    (dotimes (i 500)
      (let ((f (my-make-child)))
        (sit-for 0)
        (delete-frame f))))

  (benchmark-run 1 (my-time-child))

shows 24s with GUI, and 8s on tty. I'm using Alacritty, in case that matters
(for the KKP keyboard support, not for performance).