On 04/15/2011 10:58 PM, Jonathan Dieter wrote: > On Fri, 2011-04-15 at 22:33 -0700, JD wrote: >> On 04/15/2011 09:04 PM, Andre Robatino wrote: >>> http://cedarandthistle.wordpress.com/2009/11/06/on-binary-delta-algorithms/ >> Read the article and parts of the thesis. >> So, the final version of the algorithm >> still remains with the University of Oxford?? >> >> I downloaded the bsdiff srpm for fc15 and built it. >> >> I then used it to diff >> -rwxr-xr-x 1 root root 3699072 Feb 6 23:09 >> /boot/vmlinuz-2.6.35.11-83.fc14.i686 >> vs >> -rwxr-xr-x 1 root root 3702144 Mar 31 15:26 >> /boot/vmlinuz-2.6.35.12-88.fc14.i686 >> and the resulting patch >> -rw-r--r-- 1 root root 3554921 Apr 15 22:17 >> vmlinux-2.6.35.11-83--2.6.35.12-88.patch >> >> So, you can see that the patch is almost the same size as the files diffed. >> >> Obviously, version 4.3-8 does not contain the unpublished optimizations >> that Colin Percival mentions in his thesis. > A couple of things: > > 1. vmlinuz is compressed and it's essentially useless to delta > compressed files without uncompressing them first. > 2. We use the program deltarpm to make deltas between rpms. > Deltarpm uses a modified bsdiff algorithm as well as the add > block enhancements mentioned in my blog post. > > Jonathan So, deltarpm actually uses the enhanced (i.e. modified) algorithm that Colin Percival mentions in his thesis, or is it from a different author? I -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
