Dear all, I just uploaded into experimental a new version 0.42exp of debdelta ( you may find some binaries also in [3] ). This version adds an experimental feature : if you call 'debdelta-upgrade' with the option '--format=unzipped' , then in the recreated deb the data.tar part will not be compressed. This may speed up the 'debdelta-upgrade' + 'apt-get upgrade' process. Indeed, writing to hard disk is fast (let's say 5MB/sec, but usually much more); whereas compressing random data with 'bzip2 -9' or 'lzma -9' is much slower (let's say 2.0MB/sec and 1.5 MB/sec) ; and moreover the compressed data is then decompressed by dpkg when installing; so avoiding the compress/decompress should be a win/win (unless you run out of disk space...). Please test it and tell me what you think. (Let me mention that old deltas in the server do not support this new feature, so you may get some warnings for some days). (I also want to thank Guillem Jover for proposing this idea, in a mail in debian-dpkg@l.d.o). (In the future, we may add an even more aggressive behavior, whereby the data is directly piped from debdelta thru dpkg to the hard disk ; this would be in the spirit of [2] ; I already adapted the deltas to support this, but it needs changes in APT and in dpkg , it may be done as part of [4] ). A. [1] http://debdelta.debian.net [2] http://wiki.debian.org/SummerOfCode2010/StreamingPackageInstall [3] http://debdelta.debian.net/squeeze-backports/ [4] http://wiki.debian.org/SummerOfCode2011/AptDebdeltaIntegration
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