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bug#58558: 29.0.50; re-search-forward is slow in some buffers
From: |
Ihor Radchenko |
Subject: |
bug#58558: 29.0.50; re-search-forward is slow in some buffers |
Date: |
Tue, 13 Dec 2022 10:28:57 +0000 |
Lars Ingebrigtsen <larsi@gnus.org> writes:
> I thought it might be easier to see the differences in results if one
> first attached perf to a fresh (fast) Emacs and got the trace, and the
> waited until Emacs got slow, and repeated the same thing under another
> trace.
>
> perf is able to do this by:
>
> perf record -p <PID> -g
>
> and
>
> perf report
>
> then shows me stuff, but I don't even know what to look for when
> interpreting that. Or whether perf is, indeed, the right too for this
> task.
Ok. I got around to try perf, and it turned out to be very easy to get
started.
perf record -p <PID> + perf report already appear to give some clue:
88.27% emacs emacs-30-vcs [.]
buf_bytepos_to_charpos
3.75% emacs emacs-30-vcs [.] re_match_2_internal
1.35% emacs emacs-30-vcs [.] scan_sexps_forward
1.03% emacs emacs-30-vcs [.] re_search_2
0.65% emacs emacs-30-vcs [.] find_interval
0.56% emacs emacs-30-vcs [.] sub_char_table_ref
0.55% emacs emacs-30-vcs [.] lookup_char_property
The fraction of buf_bytepos_to_charpos increases over repeated benchmark
runs.
In contrast, using find-file-literally produces
34.44% emacs emacs-30-vcs [.]
re_match_2_internal
25.55% emacs emacs-30-vcs [.]
scan_sexps_forward
11.09% emacs emacs-30-vcs [.] re_search_2
...
0.59% emacs emacs-30-vcs [.]
buf_bytepos_to_charpos
with buf_bytepos_to_charpos taking diminishing cpu sample fraction.
Any ideas what I can do further?
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
- bug#58558: 29.0.50; re-search-forward is slow in some buffers,
Ihor Radchenko <=
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Eli Zaretskii, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Ihor Radchenko, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Eli Zaretskii, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Ihor Radchenko, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Eli Zaretskii, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Ihor Radchenko, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Eli Zaretskii, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Ihor Radchenko, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Eli Zaretskii, 2022/12/13
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Ihor Radchenko, 2022/12/14