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Date: Tue, 24 Mar 2009 11:02:09 +0800
From: KHMan <keinhong AT gmail DOT com>
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Subject: Re: rsync under cygwin too slow
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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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