Re: svn binary deltas: can they be tuned or sth?..

Daniel Berlin wrote:
> It is a window size of 1 meg at a time.
> So if nothing matches within that 1 meg window, you are out.
>
> My guess is that because you are not sorting in an order where new files
> appear last, the tar gets thrown off by more than the window size and
> nothing ever matches.

Ok, sounds reasonable, thanks :).

But how does that hold up against the repository size:

> > /repos/repos/test2/db/revs/:
> > total 1927032
> > -rw-r--r-- 1 nobody nogroup 115 Feb 6 08:09 0
> > -rw-r--r-- 1 nobody nogroup 697837468 Feb 6 08:44 1
> > -rw-r--r-- 1 nobody nogroup 636746962 Feb 10 01:08 2
> > -rw-r--r-- 1 nobody nogroup 636746967 Feb 10 02:10 3

There's a 5 byte difference between the two last revs.
It seems odd to me that the tar file should be off by more than one
MB, but the repository files end up almost exact the same size.. I
don't know the internals, so maybe I'm just not thinking straight :)..

Does increasing the window size increase the diff time exponentially?
Is changing window size to 128 MB ok, or does madness lie that way?

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Received on Thu Feb 9 23:48:21 2006