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Re: emacs rendering comparisson between emacs23 and emacs26.3
From: |
Alan Mackenzie |
Subject: |
Re: emacs rendering comparisson between emacs23 and emacs26.3 |
Date: |
Sun, 5 Apr 2020 19:57:53 +0000 |
Hello, Dmitry.
On Sun, Apr 05, 2020 at 21:05:00 +0300, Dmitry Gutov wrote:
> On 05.04.2020 19:15, Eli Zaretskii wrote:
> >> Do you at least see CPU activity significantly go up when you do such
> >> mouse wheel scrolling?
> > With what build? With the -O0 build with --enable-checking, I don't
> > need the mouse: it's enough to lean on C-v and let the keyboard
> > auto-repeat do its job -- one execution unit of the CPU maxes out
> > after 5 to 10 C-v's.
> > But with a -O2 optimized production build, Emacs keeps up both when I
> > lean on C-v and when I turn the mouse wheel constantly.
> Same here. And much as I like to see certain modes improved, I'm not
> sure this is only a performance problem. Because no matter how fast
> syntax highlighting is, you can lean on C-v faster.
> IIRC, redisplay-dont-pause was supposed to help with things like this.
> But it doesn't (and it's obsolete), and apparently jit-lock does its
> thing anyway. This looks like the interesting part of the profile:
> - scroll-up 5657 73%
> - jit-lock-function 5444 70%
> - jit-lock-fontify-now 5439 70%
> + jit-lock--run-functions 5431 70%
> + run-with-timer 5 0%
> Do you guys want to try (setq jit-lock-defer-time 0)? It comes with a
> certain visual downside, though.
> Or, alternatively, (setq fast-but-imprecise-scrolling t). This var seems
> like a good idea in general, so we might consider going further with it.
Try this:
diff --git a/src/window.c b/src/window.c
index 8cdad27b66..b23ae41aba 100644
--- a/src/window.c
+++ b/src/window.c
@@ -5475,7 +5475,9 @@ window_scroll (Lisp_Object window, EMACS_INT n, bool
whole, bool noerror)
wset_redisplay (XWINDOW (window));
- if (whole && Vfast_but_imprecise_scrolling)
+ if (Vfast_but_imprecise_scrolling
+ && (whole
+ || EQ (Vthis_command, Qmwheel_scroll)))
specbind (Qfontification_functions, Qnil);
/* On GUI frames, use the pixel-based version which is much slower
@@ -8173,6 +8175,7 @@ syms_of_window (void)
DEFSYM (Qmode_line_format, "mode-line-format");
DEFSYM (Qheader_line_format, "header-line-format");
DEFSYM (Qtab_line_format, "tab-line-format");
+ DEFSYM (Qmwheel_scroll, "mwheel-scroll");
DEFVAR_LISP ("temp-buffer-show-function", Vtemp_buffer_show_function,
doc: /* Non-nil means call as function to display a help buffer.
This eliminates all the delay I formerly saw while mouse scrolling as
fast as possibly.
--
Alan Mackenzie (Nuremberg, Germany).
- Re: emacs rendering comparisson between emacs23 and emacs26.3, (continued)
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Stefan Monnier, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Stefan Monnier, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Stefan Monnier, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/04/05
- Re: emacs rendering comparisson between emacs23 and emacs26.3, andrés ramírez, 2020/04/05
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/04/05
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/05
- Re: emacs rendering comparisson between emacs23 and emacs26.3,
Alan Mackenzie <=
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/05
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Dmitry Gutov, 2020/04/06
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/04/07
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Richard Stallman, 2020/04/07
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/04/08
- Re: emacs rendering comparisson between emacs23 and emacs26.3, martin rudalics, 2020/04/08