rsync under cygwin too slow
KHMan
keinhong@gmail.com
Tue Mar 24 10:17:00 GMT 2009
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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