bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Tassilo Horn]

Since the recent TRAMP changes on master, emacs startup takes about a
minute.  Starting it with

  emacs -Q --eval "(progn (setq debug-on-quit t) (require 'tramp))"

then waiting till it hangs and hitting C-g reveals:

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (quit)
  call-process("ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist")
  (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'"))))
  (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer)))
  (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))
  (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer)))))
  (if (= 0 (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPersist") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn (setq result ...)))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))))
  (progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlMaster") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn (setq result "-o ControlMaster=auto")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (if (= 0 (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result ...) (setq result ...))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPersist") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn ...))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer)))))))
  (if (executable-find "ssh") (progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlMaster") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn ...))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (if (= 0 (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char ...) (if ... ... ...)) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPersist") (goto-char ...) (if ... ...)) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))))))
  (progn (if (executable-find "ssh") (progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlMaster") (goto-char ...) (if ... ...)) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (if (= 0 (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn ... ... ...) (and ... ...)))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn ... ... ...) (and ... ...))))))))
  (condition-case nil (progn (if (executable-find "ssh") (progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn ... ... ...) (and ... ...)))) (if (= 0 (length result)) nil (let ((temp-buffer ...)) (save-current-buffer (set-buffer temp-buffer) (unwind-protect ... ...))) (let ((temp-buffer ...)) (save-current-buffer (set-buffer temp-buffer) (unwind-protect ... ...))))))) (error nil))
  (let ((result "") (case-fold-search t)) (condition-case nil (progn (if (executable-find "ssh") (progn (let ((temp-buffer ...)) (save-current-buffer (set-buffer temp-buffer) (unwind-protect ... ...))) (if (= 0 (length result)) nil (let (...) (save-current-buffer ... ...)) (let (...) (save-current-buffer ... ...)))))) (error nil)) result)
  (defconst tramp-ssh-controlmaster-options (let ((result "") (case-fold-search t)) (condition-case nil (progn (if (executable-find "ssh") (progn (let (...) (save-current-buffer ... ...)) (if (= 0 ...) nil (let ... ...) (let ... ...))))) (error nil)) result) "Call ssh to detect whether it supports the Control* arguments.\nReturn a string to be used in `tramp-methods'.")
  eval-buffer(#<buffer  *load*> nil "/home/horn/Repos/el/emacs/lisp/net/tramp-loaddefs.el" nil t)  ; Reading at buffer position 7084
  load-with-code-conversion("/home/horn/Repos/el/emacs/lisp/net/tramp-loaddefs.el" "/home/horn/Repos/el/emacs/lisp/net/tramp-loaddefs.el" nil t)
  require(tramp-loaddefs)
  byte-code("\302\303!\204\0\304\305\306\"\210\304\307\306\"\210\310\311!\210\310\312!\210\310\313!\210\310\314!\210\310\315!\210\310\316!\210\310\317\320\306#\2046\310\321\320\306#\210\310\322\320\306#\210\310\323!\210\324\325!\204J\326\320!\210\324\327!\203\\\330\320!\210\327\331\320!\210\332\324\333!\204f\334\320!\210\320\207" [byte-compile-not-obsolete-var byte-compile-not-obsolete-vars fboundp ignore-errors load "cl" noerror "cl-macs" require advice custom format-spec shell trampver tramp-loaddefs password-cache nil password auth-source timer boundp last-coding-system-used (lambda (def-tmp-var) (defvar last-coding-system-used def-tmp-var)) directory-sep-char (lambda (def-tmp-var) (defvar byte-compile-not-obsolete-var def-tmp-var)) (lambda (def-tmp-var) (defvar byte-compile-not-obsolete-vars def-tmp-var)) (directory-sep-char) remote-file-name-inhibit-cache (lambda (def-tmp-var) (defvar remote-file-name-inhibit-cache def-tmp-var))] 4)
  require(tramp-compat)
  byte-code("\300\301!\210\302\303\304\305\306\307\306\310\311\312\313\314&\v\210\315\316\317\320\306\303\321\322&\a\210\315\323\324\325\306\303\321\326&\a\210\327\330!\203:\315\331\304\332\306\303\321\333&\a\210\315\334\304\335\306\303\321\336&\a\210\315\337\340\341\306\303\321\342&\a\210\315\343\344\345\306\303\321\346&\a\210\315\347\350\351\313\352\306\303\321\353&	\207" [require tramp-compat custom-declare-group tramp nil "Edit remote files with a combination of ssh, scp, etc." :group files comm :link (custom-manual "(tramp)Top") :version "22.1" custom-declare-variable tramp-mode t "Whether Tramp is enabled.\nIf it is set to nil, all remote file names are used literally." :type boolean tramp-verbose 3 "Verbosity level for Tramp messages.\nAny level x includes messages for all levels 1 .. x-1.  The levels are\n\n 0  silent (no tramp messages at all)\n 1  errors\n 2  warnings\n 3  connection to remote hosts (default level)\n 4  activities\n 5  internal\n 6  sent and received strings\n 7  file caching\n 8  connection properties\n 9  test commands\n10  traces (huge)." integer boundp backup-directory-alist tramp-backup-directory-alist "Alist of filename patterns and backup directory names.\nEach element looks like (REGEXP . DIRECTORY), with the same meaning like\nin `backup-directory-alist'.  If a Tramp file is backed up, and DIRECTORY\nis a local file name, the backup directory is prepended with Tramp file\nname prefix (method, user, host) of file.\n\n(setq tramp-backup-directory-alist backup-directory-alist)\n\ngives the same backup policy for Tramp files on their hosts like the\npolicy for local files." (repeat (cons (regexp :tag "Regexp matching filename") (directory :tag "Backup directory name"))) tramp-auto-save-directory "Put auto-save files in this directory, if set.\nThe idea is to use a local directory so that auto-saving is faster." (choice (const nil) string) tramp-encoding-shell (if (memq system-type (quote (windows-nt))) (getenv "COMSPEC") "/bin/sh") "Use this program for encoding and decoding commands on the local host.\nThis shell is used to execute the encoding and decoding command on the\nlocal host, so if you want to use `~' in those commands, you should\nchoose a shell here which groks tilde expansion.  `/bin/sh' normally\ndoes not understand tilde expansion.\n\nFor encoding and decoding, commands like the following are executed:\n\n    /bin/sh -c COMMAND < INPUT > OUTPUT\n\nThis variable can be used to change the \"/bin/sh\" part.  See the\nvariable `tramp-encoding-command-switch' for the \"-c\" part.\n\nIf the shell must be forced to be interactive, see\n`tramp-encoding-command-interactive'.\n\nNote that this variable is not used for remote commands.  There are\nmechanisms in tramp.el which automatically determine the right shell to\nuse for the remote host." (file :must-match t) tramp-encoding-command-switch (if (string-match "cmd\\.exe" tramp-encoding-shell) "/c" "-c") "Use this switch together with `tramp-encoding-shell' for local commands.\nSee the variable `tramp-encoding-shell' for more information." string tramp-encoding-command-interactive (unless (string-match "cmd\\.exe" tramp-encoding-shell) "-i") "Use this switch together with `tramp-encoding-shell' for interactive shells.\nSee the variable `tramp-encoding-shell' for more information." "24.1" (choice (const nil) string)] 12)
  require(tramp)
  (progn (setq debug-on-quit t) (require (quote tramp)))
  eval((progn (setq debug-on-quit t) (require (quote tramp))))
  command-line-1(("--eval" "(progn (setq debug-on-quit t) (require 'tramp))"))
  command-line()
  normal-top-level()
--8<---------------cut here---------------end--------------->8---

The behavior is similar to when emacs starts up slow because the system
has no fully qualified domain name set, but my system does:

  % hostname
  thinkpad-t440p
  % hostname -f
  thinkpad-t440p.tsdh.org



In GNU Emacs 25.0.50.4 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.9)
 of 2015-03-06 on thinkpad-t440p
Repository revision: bfebebbc72c6a6ea375c6e8ed7f8641b25439770
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
System Description:	Arch Linux

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  hl-line-mode: t
  global-company-mode: t
  global-aggressive-indent-mode: t
  gnus-undo-mode: t
  global-edit-server-edit-mode: t
  recentf-mode: t
  shell-dirtrack-mode: t
  helm-match-plugin-mode: t
  helm-occur-match-plugin-mode: t
  helm-autoresize-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-mode: t
  icomplete-mode: t
  minibuffer-depth-indicate-mode: t
  electric-pair-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t

Recent messages:
20150306T071934.471> Reading active file via nndraft...
20150306T071934.473> Reading active file via nndraft...
20150306T071934.473> Reading active file via nndraft...done
20150306T071934.474> Reading active file from archive+nnml+archive:sent-postings via nnml...
20150306T071934.474> Opening nnml server on archive+nnml+archive:sent-postings...
20150306T071934.474> Opening nnml server on archive+nnml+archive:sent-postings...done
20150306T071934.476> nnml: Reading incoming mail (no new mail)...done
20150306T071934.476> Reading active file from archive+nnml+archive:sent-postings via nnml...
20150306T071934.477> Reading active file from archive+nnml+archive:sent-postings via nnml...done
20150306T071934.477> Checking new news...done

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Features:
(shadow sort gnus-cite emacsbug sendmail nndraft nnmh rot13 utf-7 nnml
nnnil gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-cache
gnus-demon nntp spam spam-stat gnus-uu yenc gnus-msg gnus-gravatar
mail-extr gravatar gnus-topic nnir gnus-registry registry eieio-base
th-private multiple-cursors-core s ucs-normalize warnings tar-mode
autoload lisp-mnt hl-line gnutls mm-archive network-stream nsm starttls
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bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Tassilo Horn <tsdh@gnu.org> writes:

Hi Tassilo,

> Since the recent TRAMP changes on master, emacs startup takes about a
> minute.  Starting it with
>
>   emacs -Q --eval "(progn (setq debug-on-quit t) (require 'tramp))"
>
> then waiting till it hangs and hitting C-g reveals:
>
> --8<---------------cut here---------------start------------->8---
> Debugger entered--Lisp error: (quit)
>   call-process("ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist")

What happens when you apply "ssh -o ControlPath=%C host.does.not.exist"
locally? Same delay for one minute?

Which ssh version do you run locally? Check with "ssh -V".

Best regards, Michael.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Tassilo Horn]

Michael Albinus <michael.albinus@gmx.de> writes:

Hi Michael,

>> Since the recent TRAMP changes on master, emacs startup takes about a
>> minute.  Starting it with
>>
>>   emacs -Q --eval "(progn (setq debug-on-quit t) (require 'tramp))"
>>
>> then waiting till it hangs and hitting C-g reveals:
>>
>> --8<---------------cut here---------------start------------->8---
>> Debugger entered--Lisp error: (quit)
>>   call-process("ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist")
>
> What happens when you apply "ssh -o ControlPath=%C
> host.does.not.exist" locally? Same delay for one minute?

Yes, or rather it are exactly 30 seconds.

% time ssh -o ControlPath=%C host.does.not.exist
ssh: Could not resolve hostname host.does.not.exist: Name or service not known
ssh -o ControlPath=%C host.does.not.exist  0,00s user 0,00s system 0%
cpu 30,019 total

> Which ssh version do you run locally? Check with "ssh -V".

% ssh -V                           
OpenSSH_6.7p1, OpenSSL 1.0.2 22 Jan 2015

Bye,
Tassilo

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Tassilo Horn <tsdh@gnu.org> writes:

> Hi Michael,

Hi Tassilo,

> % time ssh -o ControlPath=%C host.does.not.exist
> ssh: Could not resolve hostname host.does.not.exist: Name or service not known
> ssh -o ControlPath=%C host.does.not.exist  0,00s user 0,00s system 0%
> cpu 30,019 total

Does it behave better, if you apply

ssh -o ConnectTimeout=1 -o ControlPath=%C host.does.not.exist

>> Which ssh version do you run locally? Check with "ssh -V".
>
> % ssh -V                           
> OpenSSH_6.7p1, OpenSSL 1.0.2 22 Jan 2015

Yes, that's exactliy what Tramp tries to detect.

> Bye,
> Tassilo

Best regards, Michael.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Tassilo Horn]

Michael Albinus <michael.albinus@gmx.de> writes:

> Tassilo Horn <tsdh@gnu.org> writes:
>
>> Hi Michael,
>
> Hi Tassilo,
>
>> % time ssh -o ControlPath=%C host.does.not.exist
>> ssh: Could not resolve hostname host.does.not.exist: Name or service not known
>> ssh -o ControlPath=%C host.does.not.exist  0,00s user 0,00s system 0%
>> cpu 30,019 total
>
> Does it behave better, if you apply
>
> ssh -o ConnectTimeout=1 -o ControlPath=%C host.does.not.exist

No, that doesn't seem to have an effect.

--8<---------------cut here---------------start------------->8---
% ssh -vvv -o ConnectTimeout=0 -o ControlPath=%C host.does.not.exist
OpenSSH_6.7p1, OpenSSL 1.0.2 22 Jan 2015
debug1: Reading configuration data /home/horn/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: auto-mux: Trying existing master
debug1: Control socket "89ac5542788054b0379ade9250bf39d75698ff8a" does not exist
# HERE IT HANGS again for 30 seconds
ssh: Could not resolve hostname host.does.not.exist: Name or service not known
--8<---------------cut here---------------end--------------->8---

Bye,
Tassilo

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Ivan Shmakov]

>>>>> Tassilo Horn <tsdh@gnu.org> writes:

[…]

 > # HERE IT HANGS again for 30 seconds
 > ssh: Could not resolve hostname host.does.not.exist: Name or service
 > not known

	Most commonly, that means that some of the DNS hosts listed in
	/etc/resolv.conf fail to respond promptly; please ensure that
	the contents of that file matches the intended configuration.

	Try using $ dig @2001:db8:42::53:53 host.name.invalid (where
	2001:db8:42::53:53 is a DNS IP address, as given with
	‘nameserver’ lines in /etc/resolv.conf) to find out which of the
	servers results in this behavior.

-- 
FSF associate member #7257  http://boycottsystemd.org/  … 3013 B6A0 230E 334A

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Andreas Schwab]

Tassilo Horn <tsdh@gnu.org> writes:

> # HERE IT HANGS again for 30 seconds
> ssh: Could not resolve hostname host.does.not.exist: Name or service not known

What happens if you do "getent ahosts host.does.not.exist"?

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Tassilo Horn]

Andreas Schwab <schwab@linux-m68k.org> writes:

>> # HERE IT HANGS again for 30 seconds
>> ssh: Could not resolve hostname host.does.not.exist: Name or service not known
>
> What happens if you do "getent ahosts host.does.not.exist"?

% time getent ahosts host.does.not.exist
getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total

Bye,
Tassilo

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Andreas Schwab]

Tassilo Horn <tsdh@gnu.org> writes:

> % time getent ahosts host.does.not.exist
> getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total

Which means your system is misconfigured.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Stefan Monnier]

>> % time getent ahosts host.does.not.exist
>> getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total
> Which means your system is misconfigured.

But that's no excuse to impose such a 30s timeout on the user who did
not actually do anything that would explicitly trigger this problem.


        Stefan

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Andreas Schwab]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

>>> % time getent ahosts host.does.not.exist
>>> getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total
>> Which means your system is misconfigured.
>
> But that's no excuse to impose such a 30s timeout on the user who did
> not actually do anything that would explicitly trigger this problem.

A working hostname lookup is a fundamental part of the system.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Tassilo Horn]

Andreas Schwab <schwab@linux-m68k.org> writes:

>> % time getent ahosts host.does.not.exist
>> getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total
>
> Which means your system is misconfigured.

Keen to share at what I should have a look?  It seems I have that issue
only at home, and there /etc/resolv.conf names my Telekom/Speedport LTE
router as nameserver.  That thing's a pain in the ass for several
reasons, so this might be (1+ reasons).

Bye,
Tassilo

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Andreas Schwab]

Tassilo Horn <tsdh@gnu.org> writes:

> Andreas Schwab <schwab@linux-m68k.org> writes:
>
>>> % time getent ahosts host.does.not.exist
>>> getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total
>>
>> Which means your system is misconfigured.
>
> Keen to share at what I should have a look?

Try tcpdump to watch the dns traffic.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Tassilo Horn]

Tassilo Horn <tsdh@gnu.org> writes:

>>> % time getent ahosts host.does.not.exist getent ahosts
>>> host.does.not.exist 0,00s user 0,00s system 0% cpu 30,013 total
>>
>> Which means your system is misconfigured.
>
> Keen to share at what I should have a look?  It seems I have that
> issue only at home, and there /etc/resolv.conf names my
> Telekom/Speedport LTE router as nameserver.  That thing's a pain in
> the ass for several reasons, so this might be (1+ reasons).

Yeah, of course it's the crappy speedport again.  When I use the google
nameserver 8.8.8.8 instead, then getent and ssh return almost
immediately.

Sorry for the noise.

Bye,
Tassilo

PS: Gonna write a letter.  "Dear Telekom, today your crappy products
again wasted time of at least four free software developers.  The world
could be a so much better place if you gave at least half-way working
hardware to your dearly paying customers..."

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Daniel Colascione]

[-- Attachment #1: Type: text/plain, Size: 883 bytes --]

On 03/06/2015 11:17 AM, Andreas Schwab wrote:
> Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
> 
>>>> % time getent ahosts host.does.not.exist
>>>> getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total
>>> Which means your system is misconfigured.
>>
>> But that's no excuse to impose such a 30s timeout on the user who did
>> not actually do anything that would explicitly trigger this problem.
> 
> A working hostname lookup is a fundamental part of the system.

In theory. In practice, lookup is broken all the time, and for good
reason. We can't always know right away when we don't have connectivity.
What if I'm on a train and enter a tunnel? Connectivity is interrupted
for a little while, but not enough to trigger OS network
reconfiguration. It's inexcusable for Emacs to block for 30 seconds on
DNS resolution in this case.


[-- Attachment #2: OpenPGP digital signature --]
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bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Daniel Colascione]

[-- Attachment #1: Type: text/plain, Size: 1238 bytes --]

On 03/06/2015 02:34 PM, Daniel Colascione wrote:
> On 03/06/2015 11:17 AM, Andreas Schwab wrote:
>> Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
>>
>>>>> % time getent ahosts host.does.not.exist
>>>>> getent ahosts host.does.not.exist  0,00s user 0,00s system 0% cpu 30,013 total
>>>> Which means your system is misconfigured.
>>>
>>> But that's no excuse to impose such a 30s timeout on the user who did
>>> not actually do anything that would explicitly trigger this problem.
>>
>> A working hostname lookup is a fundamental part of the system.
> 
> In theory. In practice, lookup is broken all the time, and for good
> reason. We can't always know right away when we don't have connectivity.
> What if I'm on a train and enter a tunnel? Connectivity is interrupted
> for a little while, but not enough to trigger OS network
> reconfiguration. It's inexcusable for Emacs to block for 30 seconds on
> DNS resolution in this case.

It's also unacceptable to start six (by my count) ssh subprocesses,
especially on systems like Cygwin, where process creation is very slow.
At the very least, this work needs to be delayed until someone tries to
use an ssh connection method, and the result should be called.


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Stefan Monnier]

> reconfiguration. It's inexcusable for Emacs to block for 30 seconds on
> DNS resolution in this case.


Especially since this can happen in cases where there is no need for any
network communication (e.g. loading tramp for compilation purposes, or
for access via /sudo:, ...).


        Stefan

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Daniel Colascione <dancol@dancol.org> writes:

> It's also unacceptable to start six (by my count) ssh subprocesses,
> especially on systems like Cygwin, where process creation is very slow.

The code calls it only 3 times. Due to the autoload, the code of the
defconst was eval'ed twice, so it ends up in 6 calls.

I've changed it to a defcustom and checked it again. Now it is called
only 3 times, and it is called only when you open a remote file
(tramp.el is loaded).

> At the very least, this work needs to be delayed until someone tries to
> use an ssh connection method, and the result should be called.

As said above. Also not called when Emacs compiles in batch mode, and alike.

I would like to avoid these calls completely, if somebody could tell me
a robust test for knowing which kind of ControlMaster, ControlPath and
ControlPersist options are supported by the local ssh stanza. And no, I
don't want to check the ssh version; this isn't robust.

Would it be safe to install the patch in the emacs-24 branch? The change
which made Tassilo annoyed was introduced for Emacs 24.5, see Bug#19702.

--8<---------------cut here---------------start------------->8---
*** /home/albinus/src/emacs-24/lisp/net/tramp.el.~emacs-24~	2015-03-07 12:31:29.053902763 +0100
--- /home/albinus/src/emacs-24/lisp/net/tramp.el	2015-03-07 12:23:14.799675963 +0100
***************
*** 307,313 ****
  useful only in combination with `tramp-default-proxies-alist'.")
  
  ;;;###tramp-autoload
! (defconst tramp-ssh-controlmaster-options
    (let ((result "")
  	(case-fold-search t))
      (ignore-errors
--- 307,313 ----
  useful only in combination with `tramp-default-proxies-alist'.")
  
  ;;;###tramp-autoload
! (defcustom tramp-ssh-controlmaster-options
    (let ((result "")
  	(case-fold-search t))
      (ignore-errors
***************
*** 333,339 ****
  	      (setq result (concat result " -o ControlPersist=no")))))))
      result)
      "Call ssh to detect whether it supports the Control* arguments.
! Return a string to be used in `tramp-methods'.")
  
  ;;;###tramp-autoload
  (defcustom tramp-use-ssh-controlmaster-options
--- 333,342 ----
  	      (setq result (concat result " -o ControlPersist=no")))))))
      result)
      "Call ssh to detect whether it supports the Control* arguments.
! Return a string to be used in `tramp-methods'."
!     :group 'tramp
!     :version "24.5"
!     :type 'string)
  
  ;;;###tramp-autoload
  (defcustom tramp-use-ssh-controlmaster-options
--8<---------------cut here---------------end--------------->8---

Best regards, Michael.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Eli Zaretskii]

> From: Michael Albinus <michael.albinus@gmx.de>
> Date: Sat, 07 Mar 2015 12:35:20 +0100
> Cc: Tassilo Horn <tsdh@gnu.org>, Andreas Schwab <schwab@linux-m68k.org>,
> 	20015@debbugs.gnu.org
> 
> Would it be safe to install the patch in the emacs-24 branch?

Yes, thanks.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Eli Zaretskii <eliz@gnu.org> writes:

>> Would it be safe to install the patch in the emacs-24 branch?
>
> Yes, thanks.

Done. In the master branch, I'll try further optimizations.

Best regards, Michael.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Stefan Monnier]

> only 3 times, and it is called only when you open a remote file
> (tramp.el is loaded).

Loading tramp.el does not guarantee we want to open a remote file (it
could be a local file via /su: for example).

> I would like to avoid these calls completely, if somebody could tell me
> a robust test for knowing which kind of ControlMaster, ControlPath and
> ControlPersist options are supported by the local ssh stanza. And no, I
> don't want to check the ssh version; this isn't robust.

I like using "" for tramp-ssh-controlmaster-options, FWIW ;-)

FWIW, I find that for OpenSSH on Debian, "ssh -o
<optionname>=<optiovalue>" never waits and gives different outputs
("command-line: line 0: Bad configuration option: <optionname>",
"command-line line 0: unsupported option <optionvalue>", or the help
text).  Not sure if it's robust for other systems and other versions of ssh.


        Stefan

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> only 3 times, and it is called only when you open a remote file
>> (tramp.el is loaded).
>
> Loading tramp.el does not guarantee we want to open a remote file (it
> could be a local file via /su: for example).

Yes. In Emacs 25, I intend to delay evaluation of the code until it is
really needed. (As usual, it will take some days; I'm too busy in real life).

>> I would like to avoid these calls completely, if somebody could tell me
>> a robust test for knowing which kind of ControlMaster, ControlPath and
>> ControlPersist options are supported by the local ssh stanza. And no, I
>> don't want to check the ssh version; this isn't robust.
>
> I like using "" for tramp-ssh-controlmaster-options, FWIW ;-)
>
> FWIW, I find that for OpenSSH on Debian, "ssh -o
> <optionname>=<optiovalue>" never waits and gives different outputs
> ("command-line: line 0: Bad configuration option: <optionname>",
> "command-line line 0: unsupported option <optionvalue>", or the help
> text).  Not sure if it's robust for other systems and other versions of ssh.

That's what I do when checking ControlMaster and ControlPersist. But the
check for ControlPath=%C requires also a hostname, unfortunately.

>         Stefan

Best regards, Michael.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Version: 25.1

Michael Albinus <michael.albinus@gmx.de> writes:

> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>
>>> only 3 times, and it is called only when you open a remote file
>>> (tramp.el is loaded).
>>
>> Loading tramp.el does not guarantee we want to open a remote file (it
>> could be a local file via /su: for example).
>
> Yes. In Emacs 25, I intend to delay evaluation of the code until it is
> really needed. (As usual, it will take some days; I'm too busy in real life).

I've committed a respective patch to the master branch, marking this bug
as fixed.

Best regards, Michael.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Stefan Monnier]

> I've committed a respective patch to the master branch, marking this bug
> as fixed.

Thanks,


        Stefan

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Michael Albinus <michael.albinus@gmx.de> writes:

Hi Tassilo,

> I've committed a respective patch to the master branch, marking this bug
> as fixed.

I'm still thinking how to avoid the timeout from an improper DNS. What
happens with your sucking DNS server, if you call

# ssh -p 23 -o ControlPath=%C localhost

Best regards, Michael.

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Tassilo Horn]

Michael Albinus <michael.albinus@gmx.de> writes:

Hi Michael,

>> I've committed a respective patch to the master branch, marking this
>> bug as fixed.
>
> I'm still thinking how to avoid the timeout from an improper DNS. What
> happens with your sucking DNS server, if you call
>
> # ssh -p 23 -o ControlPath=%C localhost

That returns immediately with the same exit code but a different
message:

[horn@thinkpad-t440p][255][:-(][9675]
[~]% ssh -p 23 -o ControlPath=%C host.does.not.exist
ssh: Could not resolve hostname host.does.not.exist: Name or service not known
[horn@thinkpad-t440p][255][:-(][9676]
[~]% ssh -p 23 -o ControlPath=%C localhost          
ssh: connect to host localhost port 23: Connection refused

Bye,
Tassilo

bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes

[Michael Albinus]

Tassilo Horn <tsdh@gnu.org> writes:

> Hi Michael,

Hi Tassilo,

>> I'm still thinking how to avoid the timeout from an improper DNS. What
>> happens with your sucking DNS server, if you call
>>
>> # ssh -p 23 -o ControlPath=%C localhost
>
> That returns immediately with the same exit code but a different
> message:

No problem, I parse for "unknown.+key". I've committed a corresponding
patch to master.

> Bye,
> Tassilo

Best regards, Michael.