GNU bug report logs - #22814
25.0.91; Emacs runs out of file descriptors on OS X

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: Anders Lindgren <andlind <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 22814 <at> debbugs.gnu.org
Subject: bug#22814: 25.0.91; Emacs runs out of file descriptors on OS X
Date: Sat, 27 Feb 2016 13:17:50 +0100

Anders Lindgren <andlind <at> gmail.com> writes:

>     Can you debug this?
>
> Not within a reasonable time frame, unfortunately.

I've debugged this on FreeBSD 10. It has larger limits:

--8<---------------cut here---------------start------------->8---
albinus <at> freebsd10:~/src/emacs-25 % ulimit -u
5749
albinus <at> freebsd10:~/src/emacs-25 % ulimit -n
28791
--8<---------------cut here---------------end--------------->8---




1. Run unlimited number of file-notify-add-watch:

--8<---------------cut here---------------start------------->8---
      (let ((temporary-file-directory file-notify--test-tmpfile))
	(while t
	  (setq file-notify--test-tmpfile1 (file-notify--test-make-temp-name))
	  (write-region
	   "any text" nil file-notify--test-tmpfile1 nil 'no-message)
	  (should (file-notify-add-watch
		   file-notify--test-tmpfile1 '(change) #'ignore))))
--8<---------------cut here---------------end--------------->8---

--8<---------------cut here---------------start------------->8---
albinus <at> freebsd10:~/src/emacs-25 % gmake -C test/automated file-notify-tests SELECTOR='\"09\"'
Test file-notify-test09-sufficient-ressources condition:
    (file-error "Opening output file" "Too many open files in system" "/tmp/file-notify-test-parent11031I_Y/file-notify-test11031BbD")
   FAILED  1/2  file-notify-test09-sufficient-ressources
 
albinus <at> freebsd10:~/src/emacs-25 % ls /tmp/file-notify-test-parent11031I_Y | wc -l
   20291
--8<---------------cut here---------------end--------------->8---




2. Run limited number of file-notify-add-watch:

--8<---------------cut here---------------start------------->8---
      (let ((temporary-file-directory file-notify--test-tmpfile))
	(dotimes (_i 10000)
	  (setq file-notify--test-tmpfile1 (file-notify--test-make-temp-name))
	  (write-region
	   "any text" nil file-notify--test-tmpfile1 nil 'no-message)
	  (should (file-notify-add-watch
		   file-notify--test-tmpfile1 '(change) #'ignore)))
	(read))
--8<---------------cut here---------------end--------------->8---

--8<---------------cut here---------------start------------->8---
albinus <at> freebsd10:~/src/emacs-25 % gmake -C test/automated file-notify-tests SELECTOR='\"09\"'
[...]

root <at> freebsd10:~ # lsof -p 11075 | grep file-notify-test | wc -l
   10000
--8<---------------cut here---------------end--------------->8---




Obviously, Emacs keeps an open file descriptor per watched file, as expected.

> -- Anders

Best regards, Michael.

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