Moin Adrian! Adrian 'Dagurashibanipal' von Bidder schrieb am Mittwoch, den 27. Oktober 2004:
> On Monday 25 October 2004 23.47, Eduard Bloch wrote: > > > - in difference to apt-pupdate, I do not use chains of small diffs, > > based on days and managed by the server. Instead, the server provides > > the patch for a md5sum which contains the diffs between the version > > of the client and the current one (when the server has data for the > > old version, of course) > > - it will be faster on low-speed links since one chunk of data > > compresses much better than n small chunks. apt-dupdate will use > > bzip2 instead of gzip. > > How much server load do you anticipate? The prototype implementation [1] is quite stupid and needs a while. Dominant factor is bzip2 speed, calculate with n^2/2*(number of arches)*(number of branches)*200kB - that is the estimated ammount of data to be recompress plus base files to be checksummed. Eg. ~40MiB for stable+testing+unstable (all+i386). I expect less than 1-2 minutes CPU time for P4-2Ghz, 30days history, 12 arches, unstable+testing. However, I think about rewritting the current thingie to keep only patches between the iterations and not store the final patch on the server. Instead, a CGI script would merge them on demand (and cache the resulted file somewhere so it may be reused). This would save HD space and CPU cycles on long term. > Looking forward to trying this. Is this a tool you plan to deploy on the > official mirrors/on a public Debian machine/... or is it a tool for people > with many machines to use on their internal Debian mirror? You can install it on a mirror and create the diff-chain yourself. It should be full configurable. [1] http://people.debian.org/~blade/dupdate.pl Regards, Eduard. -- <GyrosGeier> doogie, 25 m/s is pretty fast <doogie> 40m/s from apache <doogie> 25m/s is from java <GyrosGeier> doogie, that's about 8 km/h. * GyrosGeier ducks <smurfix> GyrosGeier: Wrong. Other way round please. <smurfix> 93.6 km/h ... <GyrosGeier> smurfix, okay 10 pm <GyrosGeier> smurfix, but 93 km/h proves my point that it is pretty fast
