[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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 15:56:33 +0000 |
Eli Zaretskii <eliz@gnu.org> writes:
>> I will look how to do it. Maybe perf probe.
>> I guess, it will be useful to compile Emacs with debug symbols at this
>> point.
>
> AFAIR, you can ask perf to profile a single function, and you can ask
> it to annotate the profile with the source code.
I now compiled Emacs with debug symbols, waited enough to see observable
increase in the benchmark-run timing, and recorded the perf data.
buf_bytepos_to_charpos is still on the top
78.06% emacs emacs [.] buf_bytepos_to_charpos
3.00% emacs emacs [.] re_match_2_internal
1.05% emacs emacs [.] find_interval
1.04% emacs emacs [.] CHAR_TABLE_REF_ASCII
0.85% emacs emacs [.] make_lisp_symbol
0.80% emacs emacs [.] re_search_2
0.76% emacs emacs [.] builtin_lisp_symbol
0.62% emacs emacs [.] PSEUDOVECTORP
The specific place in the code is:
perf annotate -s buf_bytepos_to_charpos
: 352 for (tail = BUF_MARKERS (b); tail; tail = tail->next)
0.00 : 237e53: mov -0xe8(%rbp),%rax
0.00 : 237e5a: mov 0x2e8(%rax),%rax
0.01 : 237e61: mov 0x80(%rax),%rax
0.00 : 237e68: mov %rax,-0xc0(%rbp)
0.00 : 237e6f: jmp 237fc6 <buf_bytepos_to_charpos+0x7ba>
: 353 {
: 354 CONSIDER (tail->bytepos, tail->charpos);
0.02 : 237e74: mov -0xc0(%rbp),%rax
47.07 : 237e7b: mov 0x28(%rax),%rax
7.27 : 237e7f: mov %rax,-0x38(%rbp)
0.02 : 237e83: movl $0x0,-0xc4(%rbp)
9.05 : 237e8d: mov -0x38(%rbp),%rax
0.01 : 237e91: cmp -0xf0(%rbp),%rax
3.73 : 237e98: jne 237eb2 <buf_bytepos_to_charpos+0x6a6>
0.00 : 237e9a: mov -0xc0(%rbp),%rax
0.00 : 237ea1: mov 0x20(%rax),%rax
0.00 : 237ea5: mov %rax,-0x28(%rbp)
0.00 : 237ea9: mov -0x28(%rbp),%rax
0.00 : 237ead: jmp 2381cd <buf_bytepos_to_charpos+0x9c1>
2.14 : 237eb2: mov -0x38(%rbp),%rax
1.87 : 237eb6: cmp -0xf0(%rbp),%rax
0.85 : 237ebd: jle 237ef5 <buf_bytepos_to_charpos+0x6e9>
2.32 : 237ebf: mov -0x38(%rbp),%rax
0.04 : 237ec3: cmp -0xb0(%rbp),%rax
2.56 : 237eca: jge 237f29 <buf_bytepos_to_charpos+0x71d>
My guess: number of markers is growing somehow?
--
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, 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 <=
- 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
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Eli Zaretskii, 2022/12/14
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Ihor Radchenko, 2022/12/14
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Eli Zaretskii, 2022/12/14
- bug#58558: 29.0.50; re-search-forward is slow in some buffers, Ihor Radchenko, 2022/12/14