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bug#38407: 27.0.50; infinite loop with display of large file without new
From: |
Robert Pluim |
Subject: |
bug#38407: 27.0.50; infinite loop with display of large file without newlines |
Date: |
Mon, 02 Dec 2019 11:27:10 +0100 |
>>>>> On Sun, 01 Dec 2019 19:45:11 +0200, Eli Zaretskii <eliz@gnu.org> said:
>> However, for me, bidi-inhibit-bpa comprehensively deals to that.
Eli> Down to 1 min here.
Eli> One other observation is that the first time you do that in a session
Eli> after visiting the file, it takes much longer than the subsequent
Eli> times. Here, the second M-> takes 5 min with bidi-inhibit-bpa nil and
Eli> just 17 sec with it non-nil.
Eli> So I think some of this time is spent doing something we do once,
Eli> maybe loading fonts or something (this file has a lot of different
Eli> scripts).
I donʼt see any real difference between the first and second M-> with
bidi-inhibit-bpa t, so I didnʼt benchmark that, but I can if you want.
Eli> It would be interesting to run perf and compare its output with
Eli> bidi-inhibit-bpa nil and non-nil. Maybe the performance hit due to
Eli> visual-line-mode is because of some code that could be optimized, or
Eli> maybe (gasp!) even a bug. The difference between the first and
Eli> subsequent moves is also interesting to time.
Eli> I don't have access to a GUI system where I can run perf, so could
Eli> someone please do these measurements and post the resulting profiles?
Iʼve done two runs, with visual-line-mode enabled, and bidi-inhibit-bpa
t/nil. Gzipped text versions of 'perf report' attached.
(Aside: why does char_table_ref check ASCII_CHAR_P again, when
CHAR_TABLE_REF already does that?)
bidi-inhibit-bpa t:
# Overhead Command Shared Object Symbol
# ........ ............ .............................
............................................
#
11.21% emacs emacs [.]
composition_compute_stop_pos
6.11% emacs emacs [.] CHAR_TABLE_REF
5.65% emacs emacs [.] mark_object
4.17% emacs emacs [.] re_match_2_internal
2.85% emacs emacs [.]
lookup_char_property
1.82% emacs emacs [.] next_interval
1.74% emacs emacs [.] Fassq
1.65% emacs emacs [.] compute_stop_pos
1.63% emacs emacs [.] find_interval
1.19% emacs libc-2.29.so [.] _IO_getc
1.15% emacs libc-2.29.so [.]
__memmove_avx_unaligned_erms
1.12% emacs emacs [.] exec_byte_code
1.02% emacs emacs [.]
move_it_in_display_line_to
1.02% emacs emacs [.] sub_char_table_ref
0.92% emacs ld-2.29.so [.] do_lookup_x
0.90% emacs emacs [.]
buf_bytepos_to_charpos
bidi-inhibit-bpa nil:
# Overhead Command Shared Object Symbol
# ........ ............ .............................
..........................................................
#
96.59% emacs libc-2.29.so [.]
__memmove_avx_unaligned_erms
0.22% emacs emacs [.] mark_object
0.17% emacs emacs [.]
composition_compute_stop_pos
0.12% emacs emacs [.] re_match_2_internal
0.12% emacs emacs [.]
bidi_resolve_explicit
0.09% emacs emacs [.] CHAR_TABLE_REF
0.07% emacs emacs [.]
lookup_char_property
0.06% emacs emacs [.] bidi_fetch_char
0.05% emacs emacs [.] find_interval
0.05% emacs libc-2.29.so [.] _IO_getc
0.04% emacs emacs [.]
move_it_in_display_line_to
0.04% emacs emacs [.]
bidi_cache_search.constprop.0
0.04% emacs emacs [.] exec_byte_code
0.04% emacs emacs [.] next_interval
0.04% emacs emacs [.] mark_char_table
0.04% emacs emacs [.]
pdumper_marked_p_implq
0.04% emacs ld-2.29.so [.] do_lookup_x
0.03% emacs libc-2.29.so [.] __strchr_avx2
0.03% emacs emacs [.] rpl_re_search_2
0.03% emacs emacs [.] sub_char_table_ref
0.03% emacs emacs [.]
bidi_cache_iterator_state
bpa-dis-visual.txt.gz
Description: bidi-inhibit-bpa t
bpa-en-visual.txt.gz
Description: bidi-inhibiit-bpa nil
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Pieter van Oostrum, 2019/12/01
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Phil Sainty, 2019/12/01
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Pieter van Oostrum, 2019/12/01
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Eli Zaretskii, 2019/12/01
- bug#38407: 27.0.50; infinite loop with display of large file without newlines,
Robert Pluim <=
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Robert Pluim, 2019/12/03
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Eli Zaretskii, 2019/12/03
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Robert Pluim, 2019/12/04
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Eli Zaretskii, 2019/12/04
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Robert Pluim, 2019/12/05
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Eli Zaretskii, 2019/12/05
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Phil Sainty, 2019/12/05
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Eli Zaretskii, 2019/12/06
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Phil Sainty, 2019/12/06
- bug#38407: 27.0.50; infinite loop with display of large file without newlines, Eli Zaretskii, 2019/12/07