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Re: effectiveness of rsync and apt

On 4/30/06, Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de> wrote:
> Brian Eaton <eaton.lists@gmail.com> wrote:
>> http://rsync.samba.org/rsync-and-debian/rsync-and-debian.html
>> Has anyone ever done some log file analysis to figure out how much
>> bandwidth would be saved by transferring package deltas instead of
>> entire new packages?

Look at zsync and help develope it far enough so it can look into
debs. Without that the gain is practicaly 0 or less.

It's entirely possible that the gain will be nothing no matter what
algorithm is used.

The only time delta packages will be a win is for upgrades where the
client has the original package cached.  If the client is installing
the package from scratch, delta packages are useless.

I'd like to look at logs from a mirror site to try to estimate what
percentage of the bandwidth used is for upgrades versus installations
of new packages.  If 99% of the bandwidth is for new packages, I don't
see much point in making delta packages more efficient.


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