--- Begin Message ---
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Subject: |
26.0.50; Emacs should not use pselect |
|
Date: |
Fri, 21 Oct 2016 17:41:21 +0200 |
Emacs uses pselect for IO multiplexing, limiting the number of available
file descriptors to FD_SETSIZE. Rather, epoll/kqueue should be used, if
available.
In GNU Emacs 26.0.50.10 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
of 2016-10-20 built on localhost
Repository revision: 56f8384bb3f20d55693a3a1db8aa2cf490e6d18e
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description: Ubuntu 14.04 LTS
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Configured using:
'configure --with-modules --enable-checking
--enable-check-lisp-object-type'
Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-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
line-number-mode: t
transient-mark-mode: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message subr-x puny seq byte-opt gv
bytecomp byte-compile cl-extra help-mode cconv cl-loaddefs pcase cl-lib
dired dired-loaddefs format-spec rfc822 mml easymenu mml-sec
password-cache epa derived epg epg-config gnus-util rmail rmail-loaddefs
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame 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 charscript case-table epa-hook
jka-cmpr-hook help simple abbrev obarray minibuffer 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 inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)
Memory information:
((conses 16 97880 7352)
(symbols 48 20418 0)
(miscs 40 331 119)
(strings 32 18006 4996)
(string-bytes 1 591250)
(vectors 16 13824)
(vector-slots 8 454325 6227)
(floats 8 183 10)
(intervals 56 215 0)
(buffers 976 12)
(heap 1024 22892 1161))
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--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#24756: 26.0.50; Emacs should not use pselect |
|
Date: |
Sun, 29 Sep 2019 06:02:56 +0200 |
Philipp Stephani <address@hidden> writes:
> Philipp Stephani <address@hidden> schrieb am Fr., 21. Okt. 2016 um 17:42 Uhr:
>
> Emacs uses pselect for IO multiplexing, limiting the number of available
> file descriptors to FD_SETSIZE. Rather, epoll/kqueue should be used, if
> available.
>
> Some good counter-arguments were brought up:
> - pselect is in the POSIX standard, whereas the possible replacements
> (ppoll/epoll/kqueue) are not.
> - The file descriptor limit should only be hit in pathological cases, e.g.
> when leaking background processes, and is only a symptom of a bug somewhere
> else. A higher FD limit would only hide the symptom, but not fix the
> underlying root cause.
>
> Given that, I'm no longer convinced that switching away from pselect would be
> a good idea (but I'll leave this bug open for now to provide a space for
> discussion).
That was three years ago, and no such discussion has taken place here.
If there is a continued need to discuss this, perhaps it's better to
take it to emacs-devel. I'm therefore closing this bug report.
If anyone disagrees, they should feel free to reopen.
Best regards,
Stefan Kangas
--- End Message ---