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Re: rsync to copy files?

From: Warren Young
Subject: Re: rsync to copy files?
Date: Wed, 23 Jun 2004 18:02:50 -0600
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7) Gecko/20040616

Bob Friesenhahn wrote:

I have learned that using 'rsync' to copy files improves the install time quite dramatically for repeat installs.

This should only be true when the transfer channel is much slower than the disks on which the files are stored. rsync must read both the source and destination files, and do calculations on both, before it knows which parts of the files need to be transferred. When the transfer channel is a network, it's likely that the time spent doing this extra disk I/O and calculation is more than offset by the savings in network time. When the source and destination are on the same machine, there should be no such benefit.

Instead of chasing this solution, try patching autoconf to use 'cp -u' instead of 'install'.

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