William, I think what Dan is proposing is just to use an old tarball and an intelligent algorithm to auto-magically recreate the latest one. Then the user would have to uncompress it so he/she could use the new sage. I don't think this could be done inside sage itself.
2009/11/23 William Stein <wst...@gmail.com> > 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 > -- 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
