Re: tramp (2.1.16-pre); Wicked slowdown

[David Abrahams]

On Apr 16, 2009, at 8:14 AM, David Abrahams wrote:

> On Apr 16, 2009, at 7:26 AM, Michael Albinus wrote:
>
> > David Abrahams <address@hidden> writes:
> >
> > > I've noticed TRAMP being /really/ slow on my mac compared to my  
> > > Linux
> > > machine.  I am using a more recent snapshot of TRAMP on my mac, so  
> > > it's
> > > not the same thing of course.  I'd visit /boostpro.com:.emacs and it
> > > would just sit there for a long time after finding the remote shell
> > > prompt.  Spent a few hours debugging this: I turned on "enter  
> > > debugger
> > > on quit" and hit `C-g' a few times during this long process.  What  
> > > the
> > > backtraces had in common was the mapcar call in tramp-get-remote- 
> > > path.
> > > CVS blame seems to indicate that's a recent change.
> >
> > Unfortunately, the enclosure containing the debug buffer is empty.  
> > Could
> > you, please, ruren the test, and send the debug buffer then?
>
> I have enclosed a bunch of backtraces from where I hit `C-g' while  
> tying to connect.  I hope that's helpful.  Unfortunately this  
> appears to be a Mac-specific problem, and it's not because of the  
> mapcar call I referred to, because that call doesn't appear in the  
> version of Tramp I was using for bt4-bt6.  Aquamacs (which is Emacs  
> 22) with -q exhibits it in addition to my current Emacs 23  
> snapshot.  However, I installed the emacs-snapshot package in an  
> ubuntu VM running on that same hardware and I don't see it there.

Here's something that might be more useful.  I used elp to profile  
tramp.  elp.mac is the mac profile; elp.lin is the linux profile.   
They are accessing the same directory with a CVS TRAMP, but are  
strikingly different!

elp.mac
Description: Binary data

elp.lin
Description: Binary data

--
David Abrahams
BoostPro Computing
http://boostpro.com