--- Begin Message ---
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Subject: |
Major performance issues in dired over ssh (Tramp) when remote directory contains symlinks |
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Date: |
Wed, 9 Nov 2022 21:45:35 +0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.1 |
Greetings emacs devs, or to whom it may concern!
I am having troubles with dired listings of remote directories
containing many files and symlinks. When I scroll through such a dired
buffer Emacs lags (over a second) on every page-down scroll.
The problem is easily reproducible with -Q if the directory contains a
hundred files and a hundred symbolic links to some other hundred files
somewhere on the filesystem. If I kill the links in the dired buffer
(without deleting any actual files or links) then everything scrolls
smoothly as usual.
Could you please check if thats a real issue in your setting? ssh
connection I am using is not so slow...
Kind regards,
-Mikhail
In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.34,
cairo version 1.17.6)
of 2022-09-12 built on frederik
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Arch Linux
Configured using:
'configure --with-x-toolkit=gtk3 --with-native-compilation
--sysconfdir=/etc --prefix=/usr --libexecdir=/usr/lib
--localstatedir=/var --with-cairo --with-harfbuzz --with-libsystemd
--with-modules 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt
-fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
-fstack-clash-protection -fcf-protection -g
-ffile-prefix-map=/build/emacs/src=/usr/src/debug -flto=auto'
'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -flto=auto''
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XDBE XIM XPM GTK3 ZLIB
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Dired by name
Minor modes in effect:
shell-dirtrack-mode: t
tooltip-mode: t
global-eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
buffer-read-only: t
line-number-mode: t
indent-tabs-mode: t
transient-mark-mode: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message rmc puny rfc822 mml mml-sec epa
derived epg rfc6068 epg-config gnus-util rmail rmail-loaddefs
text-property-search mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils dired-aux dired dired-loaddefs tramp-sh
tramp-cache tramp tramp-loaddefs trampver tramp-integration files-x
tramp-compat shell pcomplete comint ansi-color ring parse-time iso8601
time-date ls-lisp format-spec auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs cl-loaddefs cl-lib password-cache json subr-x map
seq byte-opt gv bytecomp byte-compile cconv iso-transl tooltip 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
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overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote threads dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process
native-compile emacs)
Memory information:
((conses 16 103629 9492)
(symbols 48 8400 0)
(strings 32 27457 1311)
(string-bytes 1 928685)
(vectors 16 17653)
(vector-slots 8 390979 10629)
(floats 8 27 45)
(intervals 56 2626 0)
(buffers 992 14))
--- End Message ---
--- Begin Message ---
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Subject: |
Re: bug#59151: Major performance issues in dired over ssh (Tramp) when remote directory contains symlinks |
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Date: |
Thu, 10 Nov 2022 11:54:03 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) |
Mikhail Pomaznoy <mikpom@mikpom.ru> writes:
Hi Mikhail,
>> I recommend you to disable the buffer-local font-lock-mode in a remote
>> dired buffer with so many symlinked files, via `M-x font-lock-mode'.
> Indeed, disabling font-lock works like a charm and restores the performance
Thanks for the feedback, I'm closing the bug.
>> This takes time for remote files, especially if you don't use Tramp
>> caches, or caches with a short timeout.
> What an average Emacs Tramp user can do about those caches? searching
> for keywords `tramp cache` in customize menu of emacs gives
> nothing. If I search for `cache` in Tramp manual there is just a
> single section which doesn't look relevant for this case. Is the
> caches you talking about something "sophisticated" or simply
> documentation is lacking?
See remote-file-name-inhibit-cache. It's default value is 10, meaning
caching for 10 seconds. You can increase this value, or set it to nil.
> Of course certain lag is fine and expected when the directory is
> listed for the first time. But on every scroll ?
>
> Thanks for your reply,
>
> -Mikhail
Best regards, Michael.
--- End Message ---