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bug#3977: 23.1.50; Tramp slows down Emacs
From: |
Torsten Bronger |
Subject: |
bug#3977: 23.1.50; Tramp slows down Emacs |
Date: |
Fri, 31 Jul 2009 08:33:33 +0200 |
User-agent: |
Gnus/5.110011 (No Gnus v0.11) Emacs/23.1.50 (gnu/linux) |
Hallöchen!
Michael Albinus writes:
> Torsten Bronger <bronger@physik.rwth-aachen.de> writes:
>
>> After starting Tramp, Emacs is slowed down significantly. It is
>> sufficient to trigger Tramp just by tab-completion of a remote
>> path. From this moment on, Emacs is slow.
It's even sufficient to say customize-group -- tramp.
> Does it also happen, when you start "emacs -Q"?
See below.
>> I can't really tell whether it is slow per se or because Tramp
>> does so many network connections in the background because I use
>> Emacs through the network itself (ssh -X).
>
> I don't believe that this matters to Tramp.
I sniffed the network activity, and I found out more.
When using Emacs locally, you don't see this effect. However, here
at work, I start Emacs on my home machine through an SSH tunnel, and
then Tramp slows down Emacs significantly; not Emacs per se but only
the display. For example, I can scroll through a large text file
and it needs the same amount of time. But with Tramp, I don't see
the text scrolling, just reaching the end.
The reason seems to be that Tramp causes X network traffic
(approx. 20 TCP packages) every 5 seconds. Apparently, it makes
Emacs talking to the local client window in a way. The 5 seconds
are very constant.
Note that the machine I tried to open a file on with Tramp is
different from the machine which runs the X server, so I can
distinguish safely between Tramp's file system traffic and Tramp's X
traffic.
With emacs -Q, the effect is different. I don't see time intervals
anymore, but a continuous sending of 60 TCP packages per second. So
the effect is even worse but different.
Tschö,
Torsten.
--
Torsten Bronger, aquisgrana, europa vetus
Jabber ID: torsten.bronger@jabber.rwth-aachen.de
or http://bronger-jmp.appspot.com