Its because that's not how rsync should be used over the network. There should be a copy of rsync running on the remote machine that reads the remote files and sends only the checksums.
The setup shown here (as guessed) has the loca rsync read the remote files over the lan in order to get the checksums. Disabling checksums and using timestamps can help but is much less certain. Better to use rsyncover ssh. Sam -----Original Message----- From: KHMan <keinh...@gmail.com> Sent: Tuesday, March 24, 2009 3:16 AM To: cygwin@cygwin.com Subject: Re: rsync under cygwin too slow Alfred von Campe wrote: >> rsync -rtuplg --stats --verbose --progress --modify-window=2 >> /cygdrive/c/localfolder /cygdrive/z/backups/ >> ... >> ... >> The local and remote folders were already synchronized, that is why 0 >> files were transferred. File list generation did take only 3 minutes >> but the whole process took more than 1.5 hours to finish and consumed >> a whopping 1.9 GB of downloaded bytes and 0.4 GB of uploaded bytes as >> per network counters. For what? Zero files, Zero bytes of file data. > > I'm pretty sure this is because rsync has to copy all the files locally > to compare them to see if they need to be copied. Try running the rsync > as a service on the system that hosts the Z: drive (or run rsync over > ssh to the system that hosts the Z drive) and you will see large > performance improvement. Looks to me there is no --checksum option, so rsync skips based on size and modtime. I do something similar to Vinod. Here is an extra data point to compare against (y and u are on separate drives on same machine): $ time rsync -a --progress --stats --delete /cygdrive/y/Installs/ /cygdrive/u/Installs/ sending incremental file list Number of files: 284 Number of files transferred: 0 Total file size: 2284961277 bytes Total transferred file size: 0 bytes Literal data: 0 bytes Matched data: 0 bytes File list size: 8583 File list generation time: 0.030 seconds File list transfer time: 0.000 seconds Total bytes sent: 8606 Total bytes received: 22 sent 8606 bytes received 22 bytes 17256.00 bytes/sec total size is 2284961277 speedup is 264830.93 real 0m0.678s user 0m0.155s sys 0m0.217s With --checksum: $ time rsync -ac --progress --stats --delete /cygdrive/y/Installs/ /cygdrive/u/Installs/ sending incremental file list Number of files: 284 Number of files transferred: 0 Total file size: 2284961277 bytes Total transferred file size: 0 bytes Literal data: 0 bytes Matched data: 0 bytes File list size: 12951 File list [The entire original message is not included] -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
