On Tue, Mar 26, 2013 at 01:56:35PM +1000, Allan McRae wrote: > On 25/03/13 04:39, Dave Reisner wrote: > > On Sun, Mar 24, 2013 at 07:28:15PM +0100, Lukas Fleischer wrote: > >> On Sun, Mar 24, 2013 at 11:26:04AM -0700, Anatol Pomozov wrote: > >>> Hi > >>> > >>> On Sun, Mar 24, 2013 at 10:57 AM, Anatol Pomozov > >>> <[email protected]> wrote: > >>>> Hi, > >>>> > >>>> I am an update junkie. I do "pacman -Suy" several times a day. One > >>>> thing I do not like with current pacman is that it redownloads whole > >>>> index file each time I update system. > >>>> > >>>> :: Synchronizing package databases... > >>>> core 104.4 KiB 104K/s 00:01 > >>>> [######################] 100% > >>>> extra 1416.9 KiB 171K/s 00:08 > >>>> [######################] 100% > >>>> community 1916.6 KiB 204K/s 00:09 > >>>> [######################] 100% > >>>> > >>>> It is 3.5M it total even if only just a few new packages were added. > >>>> Multiply 3.5M to number of users and you'll get a huge number. IMHO it > >>>> is waste of bandwidth and user time. From other side index is > >>>> incremental by it nature. Could pacman use index format that fits > >>>> incremental updates better? > >>>> > >>>> A naive proposal is to use compressed format for "full fetch" (e.g. > >>>> for users who did not update more than a week), and uncompressed > >>>> append-only index for incremental. On incremental update client sends > >>>> request to server "give me append file file starting from position XXX > >>>> till the end of file", so only delta from the last update will be > >>>> fetched. Then pacman applies the delta to client index. > >>>> > >>>> What do you think about this idea? > >>> > >>> Ok, found pacman.conf option "UseDelta" that seems does what I need. > >>> BTW why it is not enabled by default? Isn't saving bandwidth a good > >>> thing? > >> > >> I'm not sure whether "UseDelta" also affects package lists (rather than > >> packages only). Arch Linux does not support deltas on the server side > >> yet, see FS#18590 [1] for details. > >> > >> [1] https://bugs.archlinux.org/task/18590 > > > > UseDelta only affects packages. It's simply not feasible to create > > deltas for the sync DBs as they exist today, especially over HTTP/FTP. > > > > To clarify - 10s if not 100s of packages get updated on an average day. > That is a lot of deltas...
If only libgit2 was still a thing... -- William Giokas | KaiSforza GnuPG Key: 0x73CD09CF Fingerprint: F73F 50EF BBE2 9846 8306 E6B8 6902 06D8 73CD 09CF
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