[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Proposal: A new approach to differential debs


Julian Andres Klode wrote:

> Today's research has shown that rolling hashes do not perform well
> on executables because of changing offsets and so on destroying the
> hashes. There were no measurable space savings when adding fairly
> similar firefox releases to either a casync or borg repository -
> and that's on uncompressed tarballs of the latest 2 firefox uploads.

For the same reason, compressors like xz apply a filter to executables
before using more generic compression algorithms on them.  See e.g.
(and the rest of the filters in that directory).

Thanks and hope that helps,

Reply to: