Re: Finishing rebuild of rpms, from deltarpms

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On Fri, 2011-04-15 at 23:06 -0700, JD wrote:
> 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 Obviously, version 4.3-8 does not contain the unpublished optimizations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?

Yes, though a different person wrote the code.

Jonathan

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