Re: Slow redisplay

[Ergus <spacibba@aol.com>]

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.