Package: emacs;
Reported by: Chris Hanson <cph <at> chris-hanson.org>
Date: Sun, 1 Oct 2023 00:59:02 UTC
Severity: normal
Found in version 29.1
Done: Eli Zaretskii <eliz <at> gnu.org>
Bug is archived. No further changes may be made.
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Chris Hanson <cph <at> chris-hanson.org> To: bug-gnu-emacs <at> gnu.org Subject: 29.1; Performance regression using pipe for subprocess Date: Sat, 30 Sep 2023 20:57:31 -0400
When using "xscheme.el" to start and interact with MIT/GNU Scheme in a
subprocess, the performance significantly degraded in Emacs 29.1. It
worked well in older releases.
Here is a recipe:
emacs -Q
M-x load-library RET xscheme RET
M-x run-scheme RET
and see how slowly the process output is printed as Scheme starts.
Compare this to Emacs 28.2 or earlier.
I've played around quite a bit to figure out what's going on, and found
that changing xscheme-start-process so that start-process used a pty
instead of a pipe eliminated the performance regression. That isn't
really a solution since there's some complicated interrupt stuff going
on that crashes the subprocess when a pty is used. I'm trying to track
that down and fix it but have not succeeded so far.
In GNU Emacs 29.1 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw3d scroll bars) of 2023-08-03 built on kleph
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.3 LTS
Configured using:
'configure --with-x-toolkit=athena --with-tree-sitter
--with-native-compilation'
Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XAW3D
XDBE XIM XINPUT2 XPM LUCID ZLIB
Important settings:
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Scheme Interaction
Minor modes in effect:
diff-auto-refine-mode: t
windmove-mode: t
which-function-mode: t
which-key-mode: t
savehist-mode: t
global-git-commit-mode: t
shell-dirtrack-mode: t
server-mode: t
global-edit-server-edit-mode: t
desktop-save-mode: t
global-auto-revert-mode: t
override-global-mode: t
global-eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
line-number-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
Load-path shadows:
/home/cph/.emacs.d/elpa/transient-20230919.2146/transient hides
/usr/local/share/emacs/29.1/lisp/transient
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package hides
/usr/local/share/emacs/29.1/lisp/use-package/use-package
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package-jump hides
/usr/local/share/emacs/29.1/lisp/use-package/use-package-jump
/home/cph/.emacs.d/elpa/bind-key-20230203.2004/bind-key hides
/usr/local/share/emacs/29.1/lisp/use-package/bind-key
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package-bind-key
hides /usr/local/share/emacs/29.1/lisp/use-package/use-package-bind-key
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package-delight
hides /usr/local/share/emacs/29.1/lisp/use-package/use-package-delight
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package-lint hides
/usr/local/share/emacs/29.1/lisp/use-package/use-package-lint
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package-core hides
/usr/local/share/emacs/29.1/lisp/use-package/use-package-core
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package-diminish
hides /usr/local/share/emacs/29.1/lisp/use-package/use-package-diminish
/home/cph/.emacs.d/elpa/use-package-20230426.2324/use-package-ensure
hides /usr/local/share/emacs/29.1/lisp/use-package/use-package-ensure
/home/cph/elisp/xscheme hides
/usr/local/share/emacs/29.1/lisp/progmodes/xscheme
/home/cph/.emacs.d/elpa/flim-20230808.1153/sasl hides
/usr/local/share/emacs/29.1/lisp/net/sasl
/home/cph/.emacs.d/elpa/seq-2.24/seq hides
/usr/local/share/emacs/29.1/lisp/emacs-lisp/seq
Features:
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magit-tag magit-merge magit-branch magit-reset magit-files magit-refs
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imenu which-key savehist git-commit magit-git magit-base magit-section
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epg rfc6068 epg-config gnus-util text-property-search time-date
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wanderlust-autoloads semi-autoloads flim-autoloads oauth2-autoloads
apel-autoloads which-key-autoloads with-editor-autoloads info
compat-autoloads seq-autoloads package browse-url url url-proxy
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generate-lisp-file url-domsuf url-util mailcap url-handlers url-parse
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map byte-opt gv bytecomp byte-compile url-vars cl-loaddefs cl-lib rmc
iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook
vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode lisp-mode prog-mode register
page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
frame minibuffer nadvice seq simple cl-generic indonesian philippine
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 emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo x-toolkit xinput2 x multi-tty
make-network-process native-compile emacs)
Memory information:
((conses 16 1000671 332582)
(symbols 48 42644 63)
(strings 32 178355 25408)
(string-bytes 1 6621053)
(vectors 16 113786)
(vector-slots 8 2668289 163190)
(floats 8 662 413)
(intervals 56 41165 25081)
(buffers 984 86))
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