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* bug#64735: 29.0.92; find invocations are ~15x slower because of ignores
@ 2023-07-19 21:16 Spencer Baugh
  2023-07-20  5:00 ` Eli Zaretskii
                   ` (3 more replies)
  0 siblings, 4 replies; 213+ messages in thread
From: Spencer Baugh @ 2023-07-19 21:16 UTC (permalink / raw)
  To: 64735


Several important commands and functions invoke find; for example rgrep
and project-find-regexp.

Most of these add some set of ignores to the find command, pulling from
grep-find-ignored-files in the former case.  So the find command looks
like:

find -H . \( -path \*/SCCS/\* -o -path \*/RCS/\* [...more ignores...] \)
-prune -o -type f -print0

Alas, on my system, using GNU find, these ignores slow down find by
about 15x on a large directory tree, taking it from around .5 seconds to
7.8 seconds.

This is very noticeable overhead; removing the ignores makes rgrep and
other find-invoking commands substantially faster for me.

The overhead is linear in the number of ignores - that is, each
additional ignore adds a small fixed cost.  This suggests that find is
linearly scanning the list of ignores and checking each one, rather than
optimizing them to a single regexp and checking that regexp.

Obviously, GNU find should be optimizing this.  However they have
previously said they will not optimize this; I commented on this bug
https://savannah.gnu.org/bugs/index.php?58197 to request they rethink
that.  Hopefully as a fellow GNU project they will be interested in
helping us...

In Emacs alone, there are a few things we could do:
- we could mitigate the find bug by optimizing the regexp before we pass
it to find; this should basically remove all the overhead but makes the
find command uglier and harder to edit
- we could remove rare and likely irrelevant things from
completion-ignored-extensions and vc-ignore-dir-regexp (which are used
to build these lists of ignores)
- we could use our own recursive directory-tree walking implementation
(directory-files-recursively), if we found a nice way to pipe its output
directly to grep etc without going through Lisp.  (This could be nice
for project-files, at least)

Incidentally, I tried a find alternative, "bfs",
https://github.com/tavianator/bfs and it doesn't optimize this either,
sadly, so it also has the 15x slowdown.



In GNU Emacs 29.0.92 (build 5, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.15.12, Xaw scroll bars) of 2023-07-10 built on

Repository revision: dd15432ffacbeff0291381c0109f5b1245060b1d
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Rocky Linux 8.8 (Green Obsidian)

Configured using:
 'configure --config-cache --with-x-toolkit=lucid
 --with-gif=ifavailable'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND
SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2 XPM LUCID
ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Shell

Memory information:
((conses 16 1939322 193013)
 (symbols 48 76940 49)
 (strings 32 337371 45355)
 (string-bytes 1 12322013)
 (vectors 16 148305)
 (vector-slots 8 3180429 187121)
 (floats 8 889 751)
 (intervals 56 152845 1238)
 (buffers 976 235)
 (heap 1024 978725 465480))





^ permalink raw reply	[flat|nested] 213+ messages in thread

end of thread, other threads:[~2024-06-11 20:00 UTC | newest]

Thread overview: 213+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-07-19 21:16 bug#64735: 29.0.92; find invocations are ~15x slower because of ignores Spencer Baugh
2023-07-20  5:00 ` Eli Zaretskii
2023-07-20 12:22   ` sbaugh
2023-07-20 12:42     ` Dmitry Gutov
2023-07-20 13:43       ` Spencer Baugh
2023-07-20 18:54         ` Dmitry Gutov
2023-07-20 12:38 ` Dmitry Gutov
2023-07-20 13:20   ` Ihor Radchenko
2023-07-20 15:19     ` Dmitry Gutov
2023-07-20 15:42       ` Ihor Radchenko
2023-07-20 15:57         ` Dmitry Gutov
2023-07-20 16:03           ` Ihor Radchenko
2023-07-20 18:56             ` Dmitry Gutov
2023-07-21  9:14               ` Ihor Radchenko
2023-07-20 16:33         ` Eli Zaretskii
2023-07-20 16:36           ` Ihor Radchenko
2023-07-20 16:45             ` Eli Zaretskii
2023-07-20 17:23               ` Ihor Radchenko
2023-07-20 18:24                 ` Eli Zaretskii
2023-07-20 18:29                   ` Ihor Radchenko
2023-07-20 18:43                     ` Eli Zaretskii
2023-07-20 18:57                       ` Ihor Radchenko
2023-07-21 12:37                         ` Dmitry Gutov
2023-07-21 12:58                           ` Ihor Radchenko
2023-07-21 13:00                             ` Dmitry Gutov
2023-07-21 13:34                               ` Ihor Radchenko
2023-07-21 13:36                                 ` Dmitry Gutov
2023-07-21 13:46                                   ` Ihor Radchenko
2023-07-21 15:41                                     ` Dmitry Gutov
2023-07-21 15:48                                       ` Ihor Radchenko
2023-07-21 19:53                                         ` Dmitry Gutov
2023-07-23  5:40                                     ` Ihor Radchenko
2023-07-23 11:50                                       ` Michael Albinus
2023-07-24  7:35                                         ` Ihor Radchenko
2023-07-24  7:59                                           ` Michael Albinus
2023-07-24  8:22                                             ` Ihor Radchenko
2023-07-24  9:31                                               ` Michael Albinus
2023-07-21  7:45                       ` Michael Albinus
2023-07-21 10:46                         ` Eli Zaretskii
2023-07-21 11:32                           ` Michael Albinus
2023-07-21 11:51                             ` Ihor Radchenko
2023-07-21 12:01                               ` Michael Albinus
2023-07-21 12:20                                 ` Ihor Radchenko
2023-07-21 12:25                                   ` Ihor Radchenko
2023-07-21 12:46                                     ` Eli Zaretskii
2023-07-21 13:01                                       ` Michael Albinus
2023-07-21 13:23                                         ` Ihor Radchenko
2023-07-21 15:31                                           ` Michael Albinus
2023-07-21 15:38                                             ` Ihor Radchenko
2023-07-21 15:49                                               ` Michael Albinus
2023-07-21 15:55                                                 ` Eli Zaretskii
2023-07-21 16:08                                                   ` Michael Albinus
2023-07-21 16:15                                                   ` Ihor Radchenko
2023-07-21 16:38                                                     ` Eli Zaretskii
2023-07-21 16:43                                                       ` Ihor Radchenko
2023-07-21 16:43                                                       ` Michael Albinus
2023-07-21 17:45                                                         ` Eli Zaretskii
2023-07-21 17:55                                                           ` Michael Albinus
2023-07-21 18:38                                                             ` Eli Zaretskii
2023-07-21 19:33                                                               ` Spencer Baugh
2023-07-22  5:27                                                                 ` Eli Zaretskii
2023-07-22 10:38                                                                   ` sbaugh
2023-07-22 11:58                                                                     ` Eli Zaretskii
2023-07-22 14:14                                                                       ` Ihor Radchenko
2023-07-22 14:32                                                                         ` Eli Zaretskii
2023-07-22 15:07                                                                           ` Ihor Radchenko
2023-07-22 15:29                                                                             ` Eli Zaretskii
2023-07-23  7:52                                                                               ` Ihor Radchenko
2023-07-23  8:01                                                                                 ` Eli Zaretskii
2023-07-23  8:11                                                                                   ` Ihor Radchenko
2023-07-23  9:11                                                                                     ` Eli Zaretskii
2023-07-23  9:34                                                                                       ` Ihor Radchenko
2023-07-23  9:39                                                                                         ` Eli Zaretskii
2023-07-23  9:42                                                                                           ` Ihor Radchenko
2023-07-23 10:20                                                                                             ` Eli Zaretskii
2023-07-23 11:43                                                                                               ` Ihor Radchenko
2023-07-23 12:49                                                                                                 ` Eli Zaretskii
2023-07-23 12:57                                                                                                   ` Ihor Radchenko
2023-07-23 13:32                                                                                                     ` Eli Zaretskii
2023-07-23 13:56                                                                                                       ` Ihor Radchenko
2023-07-23 14:32                                                                                                         ` Eli Zaretskii
2023-07-22 17:18                                                                       ` sbaugh
2023-07-22 17:26                                                                         ` Ihor Radchenko
2023-07-22 17:46                                                                         ` Eli Zaretskii
2023-07-22 18:31                                                                           ` Eli Zaretskii
2023-07-22 19:06                                                                             ` Eli Zaretskii
2023-07-22 20:53                                                                           ` Spencer Baugh
2023-07-23  6:15                                                                             ` Eli Zaretskii
2023-07-23  7:48                                                                             ` Ihor Radchenko
2023-07-23  8:06                                                                               ` Eli Zaretskii
2023-07-23  8:16                                                                                 ` Ihor Radchenko
2023-07-23  9:13                                                                                   ` Eli Zaretskii
2023-07-23  9:16                                                                                     ` Ihor Radchenko
2023-07-23 11:44                                                                             ` Michael Albinus
2023-07-23  2:59                                                                 ` Richard Stallman
2023-07-23  5:28                                                                   ` Eli Zaretskii
2023-07-22  8:17                                                             ` Michael Albinus
2023-07-21 13:17                                       ` Ihor Radchenko
2023-07-21 12:27                                   ` Michael Albinus
2023-07-21 12:30                                     ` Ihor Radchenko
2023-07-21 13:04                                       ` Michael Albinus
2023-07-21 13:24                                         ` Ihor Radchenko
2023-07-21 15:36                                           ` Michael Albinus
2023-07-21 15:44                                             ` Ihor Radchenko
2023-07-21 12:39                             ` Eli Zaretskii
2023-07-21 13:09                               ` Michael Albinus
2023-07-21 12:38                           ` Dmitry Gutov
2023-07-20 17:08         ` Spencer Baugh
2023-07-20 17:24           ` Eli Zaretskii
2023-07-22  6:35             ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-07-20 17:25           ` Ihor Radchenko
2023-07-21 19:31             ` Spencer Baugh
2023-07-21 19:37               ` Ihor Radchenko
2023-07-21 19:56                 ` Dmitry Gutov
2023-07-21 20:11                 ` Spencer Baugh
2023-07-22  6:39           ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-07-22 21:01             ` Dmitry Gutov
2023-07-23  5:11               ` Eli Zaretskii
2023-07-23 10:46                 ` Dmitry Gutov
2023-07-23 11:18                   ` Eli Zaretskii
2023-07-23 17:46                     ` Dmitry Gutov
2023-07-23 17:56                       ` Eli Zaretskii
2023-07-23 17:58                         ` Dmitry Gutov
2023-07-23 18:21                           ` Eli Zaretskii
2023-07-23 19:07                             ` Dmitry Gutov
2023-07-23 19:27                               ` Eli Zaretskii
2023-07-23 19:44                                 ` Dmitry Gutov
2023-07-23 19:27                         ` Dmitry Gutov
2023-07-24 11:20                           ` Eli Zaretskii
2023-07-24 12:55                             ` Dmitry Gutov
2023-07-24 13:26                               ` Eli Zaretskii
2023-07-25  2:41                                 ` Dmitry Gutov
2023-07-25  8:22                                   ` Ihor Radchenko
2023-07-26  1:51                                     ` Dmitry Gutov
2023-07-26  9:09                                       ` Ihor Radchenko
2023-07-27  0:41                                         ` Dmitry Gutov
2023-07-27  5:22                                           ` Eli Zaretskii
2023-07-27  8:20                                             ` Ihor Radchenko
2023-07-27  8:47                                               ` Eli Zaretskii
2023-07-27  9:28                                                 ` Ihor Radchenko
2023-07-27 13:30                                             ` Dmitry Gutov
2023-07-29  0:12                                               ` Dmitry Gutov
2023-07-29  6:15                                                 ` Eli Zaretskii
2023-07-30  1:35                                                   ` Dmitry Gutov
2023-07-31 11:38                                                     ` Eli Zaretskii
2023-09-08  0:53                                                       ` Dmitry Gutov
2023-09-08  6:35                                                         ` Eli Zaretskii
2023-09-10  1:30                                                           ` Dmitry Gutov
2023-09-10  5:33                                                             ` Eli Zaretskii
2023-09-11  0:02                                                               ` Dmitry Gutov
2023-09-11 11:57                                                                 ` Eli Zaretskii
2023-09-11 23:06                                                                   ` Dmitry Gutov
2023-09-12 11:39                                                                     ` Eli Zaretskii
2023-09-12 13:11                                                                       ` Dmitry Gutov
2023-09-12 14:23                                                                   ` Dmitry Gutov
2023-09-12 14:26                                                                     ` Dmitry Gutov
2023-09-12 16:32                                                                     ` Eli Zaretskii
2023-09-12 18:48                                                                       ` Dmitry Gutov
2023-09-12 19:35                                                                         ` Eli Zaretskii
2023-09-12 20:27                                                                           ` Dmitry Gutov
2023-09-13 11:38                                                                             ` Eli Zaretskii
2023-09-13 14:27                                                                               ` Dmitry Gutov
2023-09-13 15:07                                                                                 ` Eli Zaretskii
2023-09-13 17:27                                                                                   ` Dmitry Gutov
2023-09-13 19:32                                                                                     ` Eli Zaretskii
2023-09-13 20:38                                                                                       ` Dmitry Gutov
2023-09-14  5:41                                                                                         ` Eli Zaretskii
2023-09-16  1:32                                                                                           ` Dmitry Gutov
2023-09-16  5:37                                                                                             ` Eli Zaretskii
2023-09-19 19:59                                                                                               ` bug#66020: (bug#64735 spin-off): regarding the default for read-process-output-max Dmitry Gutov
2023-09-20 11:20                                                                                                 ` Eli Zaretskii
2023-09-21  0:57                                                                                                   ` Dmitry Gutov
2023-09-21  2:36                                                                                                     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
     [not found]                                                                                                       ` <58e9135f-915d-beb9-518a-e814ec2a0c5b@gutov.dev>
2023-09-21 13:16                                                                                                         ` Eli Zaretskii
2023-09-21 17:54                                                                                                           ` Dmitry Gutov
2023-09-21  7:42                                                                                                     ` Eli Zaretskii
2023-09-21 14:37                                                                                                       ` Dmitry Gutov
2023-09-21 14:59                                                                                                         ` Eli Zaretskii
2023-09-21 17:40                                                                                                           ` Dmitry Gutov
2023-09-21 18:39                                                                                                             ` Eli Zaretskii
2023-09-21 18:42                                                                                                               ` Dmitry Gutov
2023-09-21 18:49                                                                                                                 ` Eli Zaretskii
2023-09-21 17:33                                                                                                         ` Dmitry Gutov
2023-09-23 21:51                                                                                                           ` Dmitry Gutov
2023-09-24  5:29                                                                                                             ` Eli Zaretskii
2024-05-26 15:20                                                                                                               ` Dmitry Gutov
2024-05-26 16:01                                                                                                                 ` Eli Zaretskii
2024-05-26 23:27                                                                                                                   ` Stefan Kangas
2024-06-08 12:11                                                                                                                     ` Eli Zaretskii
2024-06-09  0:12                                                                                                                       ` Dmitry Gutov
2024-06-11  3:12                                                                                                                         ` Dmitry Gutov
2024-06-11  6:51                                                                                                                           ` Eli Zaretskii
2024-06-11 11:41                                                                                                                             ` Dmitry Gutov
2024-06-11 12:55                                                                                                                             ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-06-11 13:06                                                                                                                               ` Eli Zaretskii
2024-06-11 17:15                                                                                                                               ` Ihor Radchenko
2024-06-11 18:09                                                                                                                                 ` Dmitry Gutov
2024-06-11 19:33                                                                                                                                   ` Ihor Radchenko
2024-06-11 20:00                                                                                                                                     ` Dmitry Gutov
2023-09-21  8:07                                                                                                   ` Stefan Kangas
     [not found]                                                                                                     ` <b4f2135b-be9d-2423-02ac-9690de8b5a92@gutov.dev>
2023-09-21 13:17                                                                                                       ` Eli Zaretskii
2023-07-25 18:42                                   ` bug#64735: 29.0.92; find invocations are ~15x slower because of ignores Eli Zaretskii
2023-07-26  1:56                                     ` Dmitry Gutov
2023-07-26  2:28                                       ` Eli Zaretskii
2023-07-26  2:35                                         ` Dmitry Gutov
2023-07-25 19:16                                   ` sbaugh
2023-07-26  2:28                                     ` Dmitry Gutov
2023-07-21  2:42 ` Richard Stallman
2023-07-22  2:39   ` Richard Stallman
2023-07-22  5:49     ` Eli Zaretskii
2023-07-22 10:18 ` Ihor Radchenko
2023-07-22 10:42   ` sbaugh
2023-07-22 12:00     ` Eli Zaretskii

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