speedup is always 0.99

Brian K. White brian at aljex.com
Mon Feb 25 10:11:47 MST 2013

To clarify a little more, trying to do deltas locally doesn't actually 
get you anything, because you still have to do all the same disk work on 
each end locally even if only deltas were sent over the network. If both 
ends are the same machine, generating and reintegrating deltas is just 
more cpu work and no less disk work.

You can prove it to yourself by forcing it to do deltas by using 
localhost::module/path/to/stuff as either the source or dest and see if 
it goes any faster.


On 2/22/2013 4:31 PM, Kevin Korb wrote:
> Hash: SHA1
> Both of your paths are local.  In that case rsync forces --whole-file.
> The delta transfer is only for reducing network bandwidth usage when
> rsync is operating over the network.
> On 02/22/13 16:28, Tony Abernethy wrote:
>> Check the TIMESTAMPS on both source and target. (you probably want
>> -av or such (instead of -vr) to include ...)
>> -----Original Message----- From: rsync-bounces at lists.samba.org
>> [mailto:rsync-bounces at lists.samba.org] On Behalf Of Grant Sent:
>> Friday, February 22, 2013 3:24 PM To: rsync at lists.samba.org
>> Subject: speedup is always 0.99
>> I'm syncing from a USB disk to my hard disk like this:
>> rsync -vr /path/to/usb/disk/dir/ /path/to/hard/disk/dir/
>> But the speedup is always 0.99 which I think means it is just
>> copying the files each time instead of syncing them.  What could be
>> wrong?
>> - Grant
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