Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Message-ID: <40F2DD8B.5080406@x-ray.at>
Date: Mon, 12 Jul 2004 20:50:51 +0200
From: Reini Urban <rurban AT x-ray DOT at>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-AT; rv:1.7) Gecko/20040616
MIME-Version: 1.0
To: cygwin <cygwin AT cygwin DOT com>
Subject: Re: rsync very slow, but not a network issue
References: <40F2CE78 DOT 7030109 AT alexisgallagher DOT com>
In-Reply-To: <40F2CE78.7030109@alexisgallagher.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes

Alexis Gallagher schrieb:
> I am finding that rsync+ssh is giving extremely slow file transfers. But 
> this slowdown is hitting not when it needs to send data over the 
> network, but when it applies the rsync algorithm which is supposed to be 
> faster than sending all the data over the network. This is very puzzling.
> 
> For a benchmark, I tried transfering a 5.4 MB mp3 file three different 
> ways. Here were my results, as reported by 'scp -v' and 'rsync 
> --progress --stats':
> 
>    scp: 311000 B/s
>    rsync (file not there): 309000 B/s
>    rsync (file already there): 741 B/s
> 
> When the file is alredy there, rsync reports a speedup of about 70. 
> (When the file is not already there, the speed up is 1, of course.) I am 
> running rsync over ssh with pre-generated keys installed in my .ssh 
> directories.

This is a binary MP3.
rsync (as diff) is not good in checking binary diffs.
Please try it with a typical text file, where the patch
is smaller than the source.
-- 
Reini Urban
http://xarch.tu-graz.ac.at/home/rurban/


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/