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From: Eli Zaretskii <eliz@gnu.org>
To: Dmitry Gutov <dgutov@yandex.ru>
Cc: casouri@gmail.com, 60953@debbugs.gnu.org
Subject: bug#60953: The :match predicate with large regexp in tree-sitter font-lock seems inefficient
Date: Thu, 26 Jan 2023 22:01:14 +0200	[thread overview]
Message-ID: <83pmb1cbg5.fsf@gnu.org> (raw)
In-Reply-To: <d8cf01fa-d829-fe83-0bbf-4a5f1965a107@yandex.ru> (message from Dmitry Gutov on Thu, 26 Jan 2023 21:35:55 +0200)

> Date: Thu, 26 Jan 2023 21:35:55 +0200
> Cc: casouri@gmail.com, 60953@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> > If you are saying that GC is responsible, then running the benchmark
> > with gc-cons-threshold set to most-positive-fixnum should produce a
> > more interesting profile and perhaps a more interesting comparison.
> 
> That really helps:
> 
> (benchmark-run 1000 (progn (font-lock-mode -1) (font-lock-mode 1) (let 
> (treesit--font-lock-fast-mode) (font-lock-ensure))))
> 
> => (16.078430587 251 5.784299419999996)
> 
> (let ((gc-cons-threshold most-positive-fixnum)) (benchmark-run 1000 
> (progn (font-lock-mode -1) (font-lock-mode 1) (let 
> (treesit--font-lock-fast-mode) (font-lock-ensure)))))
> 
> => (10.369389725 0 0.0)
> 
> Do you want a perf profile for the latter? It might not be very useful.

I'd be interested in comparing the profiles of the two techniques, the
:pred and the :match, with GC disabled like that.

> > (But I thought you concluded that GC alone cannot explain the
> > difference in performance?)
> 
> I'm inclined to think the difference is related to copying of the regexp 
> string, but whether the time is spent in actually copying it, or 
> scanning its copies for garbage later, it was harder to say. Seems like 
> it's the latter, though.

If we can avoid the copying, I think it's desirable in any case.  They
are constant regexps, aren't they?





  reply	other threads:[~2023-01-26 20:01 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-20  3:53 bug#60953: The :match predicate with large regexp in tree-sitter font-lock seems inefficient Dmitry Gutov
2023-01-24  4:04 ` Dmitry Gutov
2023-01-25  3:13   ` Yuan Fu
2023-01-25  3:48     ` Dmitry Gutov
2023-01-25 12:49       ` Eli Zaretskii
2023-01-25 23:21         ` Dmitry Gutov
2023-01-26  6:50           ` Eli Zaretskii
2023-01-26  7:17             ` Yuan Fu
2023-01-26  8:10               ` Eli Zaretskii
2023-01-26 17:15                 ` Dmitry Gutov
2023-01-26 18:24                   ` Eli Zaretskii
2023-01-26 19:35                     ` Dmitry Gutov
2023-01-26 20:01                       ` Eli Zaretskii [this message]
2023-01-26 21:26                         ` Dmitry Gutov
2023-01-30  0:49                           ` Dmitry Gutov
2023-01-30 14:06                             ` Eli Zaretskii
2023-01-30 14:47                               ` Dmitry Gutov
2023-01-30 15:08                                 ` Eli Zaretskii
2023-01-30 17:15                                   ` Dmitry Gutov
2023-01-30 17:49                                     ` Eli Zaretskii
2023-01-30 18:20                                       ` Dmitry Gutov
2023-01-30 18:42                                         ` Eli Zaretskii
2023-01-30 19:01                                           ` Dmitry Gutov
2023-01-30 19:05                                             ` Eli Zaretskii
2023-01-30 19:58                                               ` Dmitry Gutov
2023-01-30 23:57                                                 ` Yuan Fu
2023-01-31  0:44                                                   ` Dmitry Gutov
2023-01-31  3:23                                                 ` Eli Zaretskii
2023-01-31 18:16                                                   ` Dmitry Gutov
2023-02-01  2:39                                                     ` Dmitry Gutov
2023-02-01 13:39                                                       ` Eli Zaretskii
2023-02-01 15:13                                                         ` Dmitry Gutov
2023-02-01 21:20                                                         ` Dmitry Gutov
2023-02-02  2:16                                                           ` Yuan Fu
2023-02-02  6:34                                                           ` Eli Zaretskii
2023-02-02 12:12                                                             ` Dmitry Gutov
2023-02-02 14:23                                                               ` Eli Zaretskii
2023-02-02 17:03                                                                 ` Dmitry Gutov
2023-02-02 17:26                                                                   ` Eli Zaretskii
2023-02-02 17:53                                                                     ` Dmitry Gutov
2023-02-02 18:03                                                                       ` Eli Zaretskii
2023-02-02 19:44                                                                         ` Dmitry Gutov
2023-02-01 13:10                                                     ` Eli Zaretskii
2023-02-01 15:15                                                       ` Dmitry Gutov
2023-01-26 17:12               ` Dmitry Gutov
2023-01-26 18:07             ` Dmitry Gutov
2023-01-26 20:46               ` Dmitry Gutov

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