Re: Willing to debug bug #3542 (23.0.94; File access via UNC path slow again under Windows)

[Eli Zaretskii]

> From: Mathias Dahl <address@hidden>
> Date: Wed, 8 Jul 2009 22:47:37 +0200
> Cc: address@hidden
> 
> > First, I don't see a ~100-fold slowdown, I see only a 10-fold slowdown
> > (vs Emacs 22.3).  This is with a directory that has ~130
> > subdirectories.

To clarify, I see 1 sec with Emacs 22.3, and 10 to 11 seconds with
Emacs 23.0.95.

> The more files there are, the bigger the slowdown seems to be, in my tests.

Can you see if it's approximately linear in the number of files?

> >  . Do you see significant difference in speed with cold and hot cache?
> >   That is, if you run Dired on the above directory, then kill the
> >   Dired buffer and immediately run Dired again on the same directory,
> >   what times do you see then in Emacs 23?
> 
> Hehe, it got even worse the second time :)

That's somewhat strange.  For me, the second time is very fast: 3-4
seconds instead of 11.

> >  . Does it help to set w32-get-true-file-attributes to nil?
> 
> Woooo! Um, yes... It helped all right. From 85 (first try) and 115
> (second try as per reuest above), down to 1,4 s. Shall we call that as
> success? :)

Yes, probably.  I will send a patch today or tomorrow for you to try.

Thanks.