Re: find-file takes forever on slow network file systems and very deep directories

[Eli Zaretskii <eliz@gnu.org>]

[Please keep the emacs-devel list on the list of addressees.]

> Date: Tue, 23 Sep 2008 12:51:23 -0700
> From: "Andrzej Leszczynski" <andy.leszczynski@gmail.com>
> 
> > Thanks.  I cannot spot anything significant: the traces look almost
> > identical, and the code of the suspect function (emulated `stat') is
> > virtually the same, up until the point where the value of
> > w32-get-true-file-attributes is checked (the value of which you said
> > made no difference).
> >
> > Previously you said that with Emacs 22.x, the number of file ops is
> > 889, but I don't see so many ops in the trace you posted to the above
> > URL.  What am I missing?
> >
> > I also don't see the 15-sec delay in the trace: both the trace from
> > Emacs 22.x and from 21.x show about 2-3 seconds between the first
> > syscall and the last.
> >
> > Please help me understand the data.
> >
> 
> the original log embedded in the email contains almost 900 lines and
> take 15 seconds - I guess you need to click on "read more"
> 
> 64      2:45:51 PM
> [...]
> 952     2:46:06 PM
> 
> and it is on emacs run with no .emacs file. Plase doble check if you
> can see that.  w32-get-true-file-attributes does not improve it.

Right, I see the whole 900+ lines now.

It looks like the VC package could be the culprit: there are many
filesystem calls that look for files such as:

  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\.bzr\checkout\
  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\dir8\dir9\dirA\dirB\dirC\RCS\ 
  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\dir8\dir9\dirA\dirB\dirC\CVS\Entries
  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\dir8\dir9\dirA\dirB\dirC\.svn\entries
  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\dir8\dir9\dirA\dirB\dirC\SCCS\
  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\dir8\dir9\dirA\dirB\dirC\file.c\_MTN\
  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\dir8\dir9\dirA\dirB\{arch}\
  W:\dir1\dir2\dir3\dir4\dir5\dir6\dir7\dir8\dir9\dirA\dirB\dirC\file.c\MCVS\

This greatly enlarges the number of files and directories Emacs needs
to `stat'.

Can you try evaluating the following expression (in Emacs 22.x):

  (remove-hook 'find-file-hook 'vc-find-file-hook)

and then see if the speed of `find-file' increases significantly as a
result?