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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.


As far as I can see, rsync under cygwin is also too slow to be useful.

This has nothing to do with Cygwin or rsync. If you ran ROBOCOPY under Windows using the same setup you would see the same performance penalty.

Agree, I mirror stuff locally and to external drives using Cygwin's rsync and sync'ing identical trees is never that slow.


Could it be a security program? For example, AVG 8 Free checks for malware by default, IIRC, and the speed impact is really noticeable, even on a basic dual core. I turned off that feature after less than 5 minutes.

--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia

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