rsync very slow, but not a network issue
Alexis Gallagher
alexis@alexisgallagher.com
Tue Jul 13 11:52:00 GMT 2004
Ok,
Now this is progress. When I use '--size-only' then I do see a speedup.
The 'transfer' is virtually instantaneous on the stopwatch, and 'rsync
--stats' reports a speed of a mere 25 bytes/sec but with a reported
speedup of 78125.
I can see why this works, but I remain confused why I should need to
resort to it. This is basically dispensing with the rsync algorithm, no?
The cygwin machine is a Pentium III, 966 Mhz, 512MB of RAM. And the OSX
machine is a 1 Ghz PowerPC G4 with 256MB of RAM. I can't believe
everyone would use rsync as much as they do if it were not useful on
machines of such specifications.
Is there a way to benchmark its hashing algorithm on both sides? Maybe
the rsync process is getting insufficient priority on one side of the
transfer? I remain
puzzled,
Alexis Gallagher
Steven Hartland wrote:
> Alexis Gallagher wrote:
>
>> So it's taking much longer in real time when the file is already
>> there, which is exactly the situation where rsync is supposed to
>> accelerate teh transfer.
>>
>> The cygwin machine is a Pentium III 1Ghz, and the eMac is a bit
>> faster I believe. This should be fast enough that it's not
>> bottlenecking on the hash computation, I think.
>
> Are you using "--size-only"? Depending on the processor the check of
> the file chunks can be slower.
>
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