Re: Slow redisplay

[Ergus]

On Sun, Aug 25, 2019 at 02:10:09PM +0300, Eli Zaretskii wrote:
> > Date: Sun, 25 Aug 2019 12:32:51 +0200
> > From: Ergus <spacibba@aol.com>
> > Cc: Eli Zaretskii <eliz@gnu.org>, help-gnu-emacs@gnu.org
> >
> > With the actual master branch I am observing a very important lagging in
> > redisplay after being using emacs for 3-4 of hours. The rediplay happens
> > like in stop motion speed, I can see the redisplay line being updated
> > slowly and it takes sometimes like 1 seconds (from the top to the bottom
> > of the screen) in my best laptop.
> >
> > (I only use emacs in tui) So the only solution after a while is to close
> > emacs and reopen again.
> >
> > I used to have these lines:
> >
> > (defun my/minibuffer-setup-hook ()
> >   (setq gc-cons-threshold most-positive-fixnum))
> >
> > (defun my/minibuffer-exit-hook ()
> >   (setq gc-cons-threshold 800000))
> >
> > (add-hook 'minibuffer-setup-hook #'my/minibuffer-setup-hook)
> > (add-hook 'minibuffer-exit-hook #'my/minibuffer-exit-hook)
> >
> > In my config, but after removing them (because someone suggested that
> > the redisplay lagging could be related with the gc) the problem is still
> > there (less critical, but still there after some hours).
> >
> > Any suggestion to find where is the issue comming from? Or what should I
> > see to make a better report?
>
> If you set garbage-collection-messages non-nil, do you see any GC
> messages when Emacs is lagging input?

No there is not any garbage collection message after 5 hours.

> If so, does invoking "M-x
> garbage-collect RET" manual fix that?
Yes, executing it manually fixes the lagging.

In my config I do.

early-init.el
=============

(setq file-name-handler-alist nil
     message-log-max 16384
     gc-cons-threshold most-positive-fixnum   ;; Defer Garbage collection
     gc-cons-percentage 1.0)

(add-hook 'window-setup-hook
         (lambda ()
           (setq file-name-handler-alist file-name-handler-alist-old
                 gc-cons-threshold 800000
                 gc-cons-percentage 0.1)
            (garbage-collect)
            (message "Load time %.06f" (float-time (time-since my/start-time))))
          t)

init.el
=======

(defun my/minibuffer-setup-hook ()
 (setq gc-cons-threshold most-positive-fixnum))

(defun my/minibuffer-exit-hook ()
 (setq gc-cons-threshold 800000))

(add-hook 'minibuffer-setup-hook #'my/minibuffer-setup-hook)
(add-hook 'minibuffer-exit-hook #'my/minibuffer-exit-hook)

================

When I actually check the variables gc-cons-threshold they are updated
properly when minibuffer is active and when not.

But it seems that the gc is not triggered because I don't see any gc
message after 5 hours and the screen is already lagging.