On Sat, Jul 23, 2011 at 09:21:22AM -0400, Randy Kramer wrote: > On Saturday 23 July 2011 08:25:10 am Roger Leigh wrote: > > I use unison several times a day to sync over 100GiB of data. > > I see it stall quite frequently. I think it's a bug in unison, > > possibly timing related. I see it only when syncing over the > > internet on a DSL connection, not over a LAN. > > Don't know if this helps, but if unison uses rsync (which, iirc, someone > mentioned it does), you should be aware that rsync has quite a bit > of "overhead" (in some sense) to determine exactly which pieces of a > file are different and then transmits only those. > > So, again, iirc, it does calculations both at the rsync server and the > rsync client to get "checksums" (not quite the word I'm looking for, > but close) of pieces of the file on both ends, then exchanges those > checksums to see where differences exist, then exchanges the necessary > pieces of the file, and finally reassembles the file. > > With very large files, it is not surprising to see the link quiet for > periods of time while calculations are being done at each end. > > (I once read the academic thesis that the author of rsync wrote about > the rsync algorithm--I don't accurately remember the details, but what > I wrote above gives the general idea.) >
In this case, there are no big files or many files involved, so it doesn't seem to be the problem. Victor -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110723155126.gc9...@llacolen.ciencias.uchile.cl