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Re: Binary diffs: real-world differencing?

From: Kevin Greiner <greinerk_at_gmail.com>
Date: 2006-02-03 17:27:24 CET

On 2/3/06, Daniel Griscom <griscom@suitable.com> wrote:
> I'm looking into Subversion, and since I do a lot of multimedia work
> I'm especially interested in its ability to do binary diffs. But I'm
> wondering: has anyone documented how well this reduces
> traffic/storage with different types of real-world files?

Since 1.2.0, svn has defaulted to using xdelta binary diffs. See
http://svn.haxx.se/users/archive-2005-05/1370.shtml. You can download
a win32 cmd-line binary here
http://evanjones.ca/software/xdelta-win32.html to see for yourself the
size of diffs after the kind of changes you typically make.

Mark's suggestion is good too. The FSFS repo stores forward diffs and
older revisions are never modified so the size of a given rev is a
good indicator of the binary diff size + some overheard for directory
contents.

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Received on Fri Feb 3 17:41:00 2006

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