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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: |
Sat, 28 Mar 2020 11:58:39 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
Hello, Eli.
On Sat, Mar 28, 2020 at 12:08:30 +0300, Eli Zaretskii wrote:
> > Date: Sat, 28 Mar 2020 10:09:59 +0300
> > From: Eli Zaretskii <address@hidden>
> > Cc: address@hidden, address@hidden, address@hidden
> > > It would be interesting to compare 24 and 23, to see what slowdown
> > > there is.
> > I expect an average twofold slowdown due to bidirectional support.
> Actually, I take that back: in benchmarks such as scroll-up-benchmark,
> and in a buffer with predominantly ASCII text, the effect of
> bidirectional support should be very small, perhaps 10% or 20%.
> So the issue of testing old v23.x CC Mode with newer versions of Emacs
> becomes more important than I originally thought. Just as a teaser,
> here's the profile I obtained by scrolling in Emacs 26.3 through the
> entire xdisp.c, it seems to point to c-find-decl-spots and its
> immediate callers and subroutines as the hot spots:
Yes. They are the functions which search for and analyse declarations.
That they take so much of the processing time is more a reflection on
the complexity of the task rather than an opportunity for optimisation.
(Which isn't to say that further optimisation is impossible, just that
it won't be easy.)
> - command-execute 1446 100%
> - call-interactively 1446 100%
> - funcall-interactively 1446 100%
> - execute-extended-command 1446 100%
> - command-execute 1446 100%
> - call-interactively 1446 100%
> - funcall-interactively 1446 100%
> - scroll-up-benchmark 1446 100%
> - let 1446 100%
> - condition-case 1446 100%
> - while 1446 100%
> - redisplay 1351 93%
> - redisplay_internal (C function) 1071 74%
> - jit-lock-function 1064 73%
> - jit-lock-fontify-now 1063 73%
> - jit-lock--run-functions 1063 73%
> - run-hook-wrapped 1063 73%
> - #<compiled 0x2000000008356520> 1063 73%
> - font-lock-fontify-region 1061 73%
> - c-font-lock-fontify-region 1061 73%
> - font-lock-default-fontify-region 982 67%
> - font-lock-fontify-keywords-region 969 67%
> - c-font-lock-declarations 686 47%
> - c-find-decl-spots 674 46%
> - #<compiled 0x20000000077e07c0> 477 32%
> - c-get-fontification-context 253 17%
> - c-looking-at-or-maybe-in-bracelist 203 14%
> - c-backward-token-2 196 13%
> - c-backward-sws 35 2%
> - c-beginning-of-macro 12 0%
> back-to-indentation 6 0%
> - c-backward-token-2 16 1%
[ .... ]
--
Alan Mackenzie (Nuremberg, Germany).
- Re: emacs rendering comparisson between emacs23 and emacs26.3, (continued)
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/03/22
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Richard Stallman, 2020/03/22
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Alan Mackenzie, 2020/03/26
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Stefan Monnier, 2020/03/26
- Re: emacs rendering comparisson between emacs23 and emacs26.3, rrandresf, 2020/03/26
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/03/27
- Re: emacs rendering comparisson between emacs23 and emacs26.3, andrés ramírez, 2020/03/27
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Richard Stallman, 2020/03/27
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3,
Alan Mackenzie <=
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Alan Mackenzie, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Alan Mackenzie, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Alan Mackenzie, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Eli Zaretskii, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, andrés ramírez, 2020/03/29
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Stefan Monnier, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Stefan Monnier, 2020/03/28
- Re: emacs rendering comparisson between emacs23 and emacs26.3, Richard Stallman, 2020/03/27