rsync compression (-z) and timestamp

[lewis butler]

On 27-Jan-2009, at 06:49, Paul Slootman wrote:
> On Tue 27 Jan 2009, Paul Slootman wrote:
>> No, the data over the wire is compressed with the -z option; not the
>> file.
>
> Correction: more specifically, the data between the sender and the
> receiver processes is compressed.
>
> Unfortunately this also happens when the transfer is local and -z
> happens to be passed as an option; the result is that the transfer is
> slowed down significantly without any benefit at all. Rsync should
> perhaps give a warning about the useless use of -z and maybe ignore  
> it?

Does rsync necessarily know if a transfer is actually local or not?


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