GNU bug report logs - #55729
27.1; Emacs 28.1 `string-match' is five times slower than Emacs 27.1

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Chen Bin <chenbin.sh <at> gmail.com>
Subject: bug#55729: closed (Re: bug#55729: 27.1; Emacs 28.1 `string-match'
 is five times slower than Emacs 27.1)
Date: Tue, 31 May 2022 02:26:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#55729: 27.1; Emacs 28.1 `string-match' is five times slower than Emacs 27.1

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 55729 <at> debbugs.gnu.org.

-- 
55729: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=55729
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: chenbin.sh <at> gmail.com, 55729-done <at> debbugs.gnu.org
Subject: Re: bug#55729: 27.1;
 Emacs 28.1 `string-match' is five times slower than Emacs 27.1
Date: Tue, 31 May 2022 05:25:55 +0300

> Cc: 55729 <at> debbugs.gnu.org
> Date: Tue, 31 May 2022 09:04:13 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Chen Bin <chenbin.sh <at> gmail.com> writes:
> 
> > Run below code in both Emacs 28.1 and Emacs 27.1
> >
> > ;; Run "base64 /dev/urandom | head -c 3000000000 > 3g.txt" to create 3g.txt
> > ;; Then run below code in Emacs,
> > (setq content
> >       (with-temp-buffer
> >         (let ((coding-system-for-read 'utf-8-unix))
> >           (insert-file-contents "3g.txt"))
> >         (buffer-string)))
> >
> > (message "content length=%s" (length content))
> > (let* ((gc-cons-threshold most-positive-fixnum))
> >   (message "%s vs %s"
> >            (benchmark-run-compiled 1
> >              (string-match "aaaaa" content))
> >            (benchmark-run-compiled 1
> >              (string-match "bbbbb" content))))
> >
> > Using same machine, same emacs setup, 28 is alwasy much slower than 27.
> >
> > Emacs 28 enables native compilation. But string-match is C API, so I'm not
> > sure native compilation matters.
> 
> Did you disable compiler optimizations when building Emacs?

Yes.  Here's the response (sent only to myself):

> From: Chen Bin <chenbin.sh <at> gmail.com>
> Date: Tue, 31 May 2022 04:53:55 +1000
> 
> Thanks for the heads up.
> 
> I double checked my build script and found I forgot to setup `-O2'
> CFLAG. Sorry to bother you guys with such my mistake. 
> 
> It's all good now.

So I'm closing this bug.

[Message part 3 (message/rfc822, inline)]

From: Chen Bin <chenbin.sh <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; Emacs 28.1 `string-match' is five times slower than Emacs 27.1
Date: Tue, 31 May 2022 00:45:49 +1000

Run below code in both Emacs 28.1 and Emacs 27.1

;; Run "base64 /dev/urandom | head -c 3000000000 > 3g.txt" to create 3g.txt
;; Then run below code in Emacs,
(setq content
      (with-temp-buffer
        (let ((coding-system-for-read 'utf-8-unix))
          (insert-file-contents "3g.txt"))
        (buffer-string)))

(message "content length=%s" (length content))
(let* ((gc-cons-threshold most-positive-fixnum))
  (message "%s vs %s"
           (benchmark-run-compiled 1
             (string-match "aaaaa" content))
           (benchmark-run-compiled 1
             (string-match "bbbbb" content))))

Using same machine, same emacs setup, 28 is alwasy much slower than 27.

Emacs 28 enables native compilation. But string-match is C API, so I'm not
sure native compilation matters.

In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu)
 of 2021-11-27, modified by Debian built on x86-csail-01
System Description: Debian GNU/Linux bookworm/sid

Recent messages:
Loading ivy...done
Loading /home/cb/.custom.el (source)...
*** Emacs loaded in 0.48 seconds with 0 garbage collections.
Loading /home/cb/.custom.el (source)...done
Loading /home/cb/.emacs.d/.session...done
Loading /home/cb/.emacs.d/company-statistics-cache.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Color theme [doom-material-dark] loaded.
[yas] Prepared just-in-time loading of snippets successfully.

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --enable-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --build
 x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
 --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --with-x=no
 --without-gsettings 'CFLAGS=-g -O2
 -ffile-prefix-map=/build/emacs-fQHadv/emacs-27.1+1=. -fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
SOUND GPM DBUS NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 ZLIB XIM
MODULES THREADS LIBSYSTEMD JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LC_COLLATE: zh_CN.UTF-8
  value of $LC_CTYPE: zh_CN.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: zh_CN.UTF-8
  value of $LC_NUMERIC: zh_CN.UTF-8
  value of $LC_TIME: zh_CN.UTF-8
  value of $LANG: 
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  global-auto-revert-mode: t
  midnight-mode: t
  evil-find-char-pinyin-mode: t
  winner-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  global-git-gutter-mode: t
  display-time-mode: t
  which-key-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  global-evil-visualstar-mode: t
  evil-visualstar-mode: t
  global-evil-matchit-mode: t
  evil-matchit-mode: t
  diredfl-global-mode: t
  winum-mode: t
  company-statistics-mode: t
  global-company-mode: t
  company-mode: t
  ivy-mode: t
  evil-escape-mode: t
  shell-dirtrack-mode: t
  evil-mode: t
  evil-local-mode: t
  save-place-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/cb/.emacs.d/site-lisp/keyfreq/keyfreq hides /home/cb/.emacs.d/elpa/keyfreq-20210630.1318/keyfreq
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-mua hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-mua
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-maildir-fcc hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-maildir-fcc
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-tag hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-tag
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-tree hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-tree
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-version hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-version
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-print hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-print
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/coolj hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/coolj
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-company hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-company
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-hello hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-hello
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-address hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-address
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-lib hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-lib
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-autoloads hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-autoloads
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-jump hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-jump
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-show hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-show
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-parser hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-parser
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-compat hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-compat
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-crypto hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-crypto
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-query hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-query
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-message hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-message
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-wash hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-wash
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-draft hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-draft
/usr/share/emacs/site-lisp/elpa/notmuch-0.36/notmuch-pkg hides /usr/share/emacs/site-lisp/elpa-src/notmuch-0.36/notmuch-pkg

Features:
(shadow sort bbdb-message bbdb bbdb-site timezone wucuo wucuo-sdk
find-lisp lazyflymake lazyflymake-sdk flymake-proc flymake mwheel
warnings mail-extr auto-save autorevert filenotify midnight
evil-exchange evil-find-char-pinyin pinyinlib winner
display-line-numbers git-gutter time image which-key evil-surround
evil-visualstar evil-nerd-commenter evil-nerd-commenter-operator
evil-nerd-commenter-sdk sgml-mode dom evil-matchit-evil-setup
yasnippet-snippets yasnippet emacsbug message rmc puny format-spec
rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail
rmail-loaddefs text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
doom-material-dark-theme doom-themes doom-themes-base cap-words
superword subword amx s counsel xdg xref project dired-aux dired-x
diredfl dired dired-loaddefs compile swiper winum dash term/xterm xterm
company-ispell company-oddmuse company-keywords company-gtags
company-dabbrev-code company-dabbrev company-files company-clang
company-capf company-semantic company-template company-bbdb
company-cmake company-c-headers company-ctags find-file
company-statistics company pcase session ivy delsel ivy-faces
ivy-overlay colir color cus-start cus-load init-no-byte-compile
init-evil general evil-escape evil evil-keybindings evil-integration
evil-maps evil-commands reveal flyspell ispell evil-jumps
evil-command-window evil-search evil-ex native-complete shell pcomplete
comint regexp-opt ansi-color evil-types evil-macros evil-repeat
evil-states evil-core advice evil-common windmove calc calc-loaddefs
calc-macs thingatpt rect evil-digraphs evil-vars init-hydra cl-extra
help-mode hydra ring lv init-writting init-dired init-shackle
init-emacs-w3m init-misc saveplace init-essential init-theme init-httpd
init-keyfreq keyfreq easy-mmode init-chinese init-company init-web-mode
init-term-mode init-lua-mode init-gnus init-bbdb init-ctags
init-clipboard init-gtags init-git init-linum-mode init-cc-mode
init-yasnippet init-lisp init-python init-org init-javascript
init-windows init-ivy init-ibuffer edmacro kmacro ibuf-macs
init-spelling init-elpa init-file-type init-utils init-modeline
init-autoload info tool-bar rx w3m-load package easymenu browse-url
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json subr-x map url-vars seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib early-init china-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 multi-tty make-network-process
emacs)

Memory information:
((conses 16 367525 448971)
 (symbols 48 26562 13)
 (strings 32 77860 38359)
 (string-bytes 1 2651900)
 (vectors 16 30280)
 (vector-slots 8 399594 211814)
 (floats 8 499 826)
 (intervals 56 1790 90)
 (buffers 1000 12))

-- 
Best Regards,
Chen Bin

--
Help me, help you

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