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On 30/04/06, Patrick Lauer <patrick@g.o> wrote: |
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> Hi all, |
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> |
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> I had this random idea that many of our distfiles are .tar.gz while more |
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> efficient compression methods exist. So I did some testing for fun: |
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If you already have an old copy of the distfile it's much more |
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bandwidth efficient to transfer deltas. Many Gentoo users rarely clean |
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out /usr/portage/distfiles so it could be quite a bandwidth saving to |
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use something like zsync http://zsync.moria.org.uk/ . |
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I did some tests a long time ago and found that a version bump of a |
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package like kdegraphics produced a 300k uncompressed diff, which was |
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25x more bandwidth efficient to transfer with rsync than to download |
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the full bz2 file. I haven't played with zsync yet, but the technical |
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paper suggests it is close to 'rsync -z' in terms of bandwidth |
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efficiency, and it removes some of the drawbacks of rsync, such as |
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high server load and the requirement to run a special daemon. |
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-- |
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