Large file - match process taking days

Wayne Davison wayned at
Thu Jul 31 02:29:46 GMT 2008

On Wed, Jul 30, 2008 at 04:33:04PM +0300, Shachar Shemesh wrote:
> Rsync does have some CPU inefficient behavior for especially large files. 
> However, it should not happen at the block size you are using (assuming the 
> files are fairly identical). Try increasing it a little further, to 1638400 
> (80% utilization on the hash table), and see if things are any better.

Rsync 3.0.x automatically sizes the hash table to keep things around 80%
utilization, so the block size shouldn't make any difference in that
regard (using a slightly tweaked version of your patch).  Hmm, this
improvement does not seem to be in the NEWS for 3.0.0, so I added it
into the OLDNEWS file and the on-line version.


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