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bug#29889: 27.0.50; Slow visual selection
From: |
Eli Zaretskii |
Subject: |
bug#29889: 27.0.50; Slow visual selection |
Date: |
Sun, 31 Dec 2017 09:20:19 +0200 |
User-agent: |
K-9 Mail for Android |
On December 31, 2017 7:25:32 AM GMT+02:00, Sujith <m.sujith@gmail.com> wrote:
> Eli Zaretskii <eliz@gnu.org> writes:
> > Run Emacs under 'perf' (or build with C-level profiling), and show
> the
> > C-level profile while moving the cursor with region highlighted?
> That
> > should tell whether my hypothesis above holds any water, and if not,
> > point out some other suspects.
>
> I did 'perf record emacs' and then 'perf report --stdio'.
>
> Profile report (just the top few lines):
>
> # Overhead Command Shared Object Symbol
>
> # ........ ........... ..........................
> ................................
> #
> 41.09% emacs emacs-27.0.50 [.] mark_object
> 10.90% emacs emacs-27.0.50 [.]
> balance_an_interval
> 4.23% emacs emacs-27.0.50 [.] mark_interval
> 3.77% emacs emacs-27.0.50 [.] Flength
> 3.45% emacs emacs-27.0.50 [.] sweep_strings
> 3.11% emacs emacs-27.0.50 [.] sweep_conses
> 2.94% emacs emacs-27.0.50 [.]
> balance_intervals_internal
> 2.85% emacs emacs-27.0.50 [.] sweep_intervals
> 1.91% emacs emacs-27.0.50 [.]
> traverse_intervals_noorder
> 1.70% emacs emacs-27.0.50 [.] mark_char_table
> 1.65% emacs emacs-27.0.50 [.] next_interval
> 1.52% emacs emacs-27.0.50 [.] copy_intervals
> 1.50% emacs emacs-27.0.50 [.] concat
> 1.43% emacs emacs-27.0.50 [.] sweep_vectors
> 1.28% emacs emacs-27.0.50 [.] scan_sexps_forward
> 0.93% emacs emacs-27.0.50 [.] Fcons
> 0.84% emacs emacs-27.0.50 [.] exec_byte_code
> 0.81% emacs emacs-27.0.50 [.] sweep_symbols
> 0.72% emacs emacs-27.0.50 [.]
> re_match_2_internal
>
>
> Using gprof with --enable-profiling, the report looks like:
>
> Flat profile:
>
> Each sample counts as 0.01 seconds.
> % cumulative self self total
> time seconds seconds calls ms/call ms/call name
> 33.97 6.33 6.33 111195700 0.00 0.00 mark_object
> 10.26 8.24 1.91 31639099 0.00 0.00
> balance_an_interval
> 3.54 8.90 0.66 22239242 0.00 0.00 mark_interval
> 2.95 9.45 0.55 7431 0.07 0.25
> balance_intervals_internal
> 2.79 9.97 0.52 223 2.33 10.50 sweep_strings
> 2.42 10.42 0.45 7826133 0.00 0.00 Flength
> 2.42 10.87 0.45 223 2.02 2.26 sweep_conses
> 2.09 11.26 0.39 223 1.75 1.89 sweep_intervals
> 2.09 11.65 0.39 419665 0.00 0.00 assq_no_quit
> 2.04 12.03 0.38 11148108 0.00 0.00 next_interval
> 1.93 12.39 0.36 42738 0.01 0.02 scan_sexps_forward
> 1.88 12.74 0.35 7482960 0.00 0.00 concat
> 1.66 13.05 0.31 24810407 0.00 0.00
> FETCH_MULTIBYTE_CHAR
> 1.40 13.31 0.26 34595 0.01 0.01 mark_char_table
> 1.34 13.56 0.25 7431 0.03 0.12
> traverse_intervals_noorder
> 1.29 13.80 0.24 422335 0.00 0.00 exec_byte_code
> 1.18 14.02 0.22 223 0.99 1.14 sweep_vectors
> 1.07 14.22 0.20 282 0.71 0.71 evxprintf
Thanks a lot!
Since mark_object appears high in the profile, could you please
rerun the experiment after setting gc-cons-threshold and
gc-cons-percentage so as to avoid GC for the time of the expdriment?
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/28
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/29
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/29
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/30
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection,
Eli Zaretskii <=
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/31