From: Keith David Bershatsky <esq@lawlist.com>
To: agrambot@gmail.com,eliz@gnu.org,dancol@dancol.org
Cc: emacs-devel@gnu.org
Subject: Re: NS port: How to debug excessive garbage collection?
Date: Sun, 14 Apr 2019 12:46:28 -0700 [thread overview]
Message-ID: <m2o958xtd7.wl%esq@lawlist.com> (raw)
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The attched patch (debug_mwe_001.diff) is a minimal working example that demonstrates the issue on all three platforms (X11, W32, NS) using the GUI version of Emacs built from the master branch as of 04/08/2019 (a038df77de7b1aa2d73a6478493b8838b59e4982).
The snippet that I am pasting and evaluating in the minibuffer is as follows:
(progn
(find-library "simple")
(fundamental-mode)
(blink-cursor-mode -1)
(global-eldoc-mode -1)
(setq timer-list nil
timer-idle-list nil
crosshairs t))
Here are Youtube links to screen recordings of the minimal working example on all three platforms:
NS (screen recording): https://youtu.be/4IzXfP2j2GY
X11 (screen recording): https://youtu.be/zrRH72qdmx0
W32 (screen recording): https://youtu.be/cfIG4fbkesY
MINIMAL WORKING EXAMPLE:
1. Imaginary / Pretend: We imagine that all fake cursors are erased at the outset of update_window while w->current_matrix is still valid; i.e., before scrolling_window does its thing.
2. The master cache of fake cursors (w->ch_cache) is set to Qnil.
3. Imaginary / Pretend: We imagine .... As to the rows in the w->desired_matrix that must be updated with update_text_area, we draw fake cursors immediately after draw_glyphs finishes updating the row. As we are laying fake cursors, we use a temporary cache (w->mc_temp_cache) to store the relevant data so that we can redraw any fake cursors that get erased because they are left/right_overwritten as determined by draw_glyphs. Once the row has been updated with fake cursors, we set the termporary cache (w->mc_temp_cache) to Qnil and we set the master cache with the new data -- appending new data if the cache is non-nil.
4. As to all remaining rows that are not updated with update_text_area (which uses w->desired_matrix), we use the w->current_matrix and draw/cache the fake cursors using the same approach as mentioned in the preceding step; i.e., a temporary cache (w->mc_temp_cache) so that we can fix any fake cursors that got left/right_overwritten and then that cache is set to Qnil and the master cache (w->mc_cache) is updated.
In the above minimal working example, the window Lisp_Object caches are rather simple:
'((make_fixnum (1))
(make_fixnum (2))
(make_fixnum (3))
...
(make_fixnum (99)))
[-- Attachment #2: debug_mwe_001.diff --]
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next reply other threads:[~2019-04-14 19:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-14 19:46 Keith David Bershatsky [this message]
2019-04-14 23:31 ` NS port: How to debug excessive garbage collection? Alex Gramiak
-- strict thread matches above, loose matches on Subject: below --
2019-04-16 5:51 Keith David Bershatsky
2019-04-16 2:57 Keith David Bershatsky
2019-04-16 5:26 ` Alex Gramiak
2019-04-15 5:19 Keith David Bershatsky
2019-04-15 2:55 Keith David Bershatsky
2019-04-15 3:44 ` Alex Gramiak
2019-04-14 7:41 Keith David Bershatsky
2019-04-13 18:07 Keith David Bershatsky
2019-04-13 21:41 ` Alex Gramiak
2019-04-14 3:47 ` Daniel Colascione
2019-04-13 16:31 Keith David Bershatsky
2019-04-13 17:02 ` Alex Gramiak
2019-04-13 5:55 Keith David Bershatsky
2019-04-13 6:48 ` Eli Zaretskii
2019-04-11 23:04 Keith David Bershatsky
2019-04-12 9:30 ` Eli Zaretskii
2019-04-11 3:27 Keith David Bershatsky
2019-04-11 14:14 ` Eli Zaretskii
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