rsync feature request: conditional compression

jw schultz jw at
Thu Jan 16 02:25:00 EST 2003

On Wed, Jan 15, 2003 at 06:47:09PM -0600, Seann Herdejurgen wrote:
> rsync is optimized to conserve network resources,
> sometimes at the expense of CPU resources.  As long as
> CPU's are fast and networks are slow, rsync with
> compression does a great job.  However, if I run rsync on
> a slow box (166MHz Ultra SPARC) over a fast network
> (100Mb/s), the compression kills the transfer rate.  I
> turned compression off and I should be done rsyncing my
> files (60GB) overnight.

If your network is faster than CPU and the disk subsystem
you will find --whole-file speeds things up even more.
The rsync algorithm is great but it does generate more than
twice the disk I/O of --whole-file (subject to caching).

	J.W. Schultz            Pegasystems Technologies
	email address:		jw at

		Remember Cernan and Schmitt

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