On Mon, Nov 23, 2009 at 6:08 PM, Dan Drake <dr...@kaist.edu> wrote: > On Mon, 23 Nov 2009 at 03:55PM -0800, William Stein wrote: >> > A compromise between "tarball on a webserver" and "rsync server" is >> > zsync: http://zsync.moria.org.uk/ >> > >> > "zsync is a file transfer program. It allows you to download a file from >> > a remote server, where you have a copy of an older version of the file >> > on your computer already. zsync downloads only the new parts of the >> > file. It uses the same algorithm as rsync. However, where rsync is >> > designed for synchronising data from one computer to another within an >> > organisation, zsync is designed for file distribution, with one file on >> > a server to be distributed to thousands of downloaders." >> > >> > It seems like it would work really well, except that it would require >> > people to keep their old downloads; to efficiently upgrade to, say, >> > 4.2.1, you would need the tarball from downloading 4.2. >> > >> > It seems like a reasonable mix of regular file downloads and rsync. >> > >> > Dan >> >> So, I think this is all a great idea! To make it happen though, >> somebody (not me) has to volunteer to bust their 'arse and make it >> happen. > > I just tested it, and using it should be super easy. Visit > http://sagenb.kaist.ac.kr/~drake/ and grab a tarball from there, say > sage-4.2.alpha0.tar. Install zsync, and then do > > $ zsync -i sage-4.2.alpha0.tar > http://sagenb.kaist.ac.kr/~drake/sage-4.2.tar.zsync > > It will use the 4.2.alpha0 tarball as a source, then download the > necessary bits to give you a 4.2 tarball. If I'm reading the output > right, it used used 197 megabytes from the alpha0 tarball (so it > didn't download anything new) and only downloaded 74 megabytes. (Using > 10^6 bytes = megabyte), so it only transferred about 27% of tarball > using nothing more than the webserver I am already running. > > All you do is run "zsyncmake" on the file you want to efficiently serve > up. There are some options that I'll play with, but this could easily be > scripted. Then we have to educate users, which will likely be the harder > part if we want to use this.
What do you envision users doing, exactly? Why not just make it so sage -upgrade is "educated"? William -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
