Re: optimizing fsfs: reverse diffs?

On Fri, Apr 08, 2005 at 02:21:21PM -0400, Daniel Berlin wrote:
> If you add 1.12
> you need to make
>
>
> diff (1.9 to 1.8) 1.8
> diff (1.10 to 1.9) 1.9
> diff (1.11 to 1.10) 1.10
> diff (1.12 to 1.11) 1.11 <----- this is the redeltification
> ft 1.12

Great, now I see that "redeltification" == exactly what I was talking about. Thought it implied recomputing a whole chain of deltas, not just the last one.

>
>
> > > When somebody actually comes up with a case where the majority of the
> > > checkout time is being spend trying to run down skip-deltas for the
> > > HEAD, i'd be concerned.
> > > This never really is the case, though, so it's all just talk. The
> > > slowdown is not here, move along :)
> > >
> >
> > You called me on it--I've done no profiling myself & have no numbers,
> > only vague accusations. :) Just wanted to see if something like this
> > has been considered. I can tell it has--thanks to you, Daniel, & Mark
> > both.
> >
> :)
> If you do, however, discover that it is a real percentage of the time
> (IE more than 10% or 15%), *please*, let us know.

You bet.

-- 
Alan Grow
Software Engineer / 
Opensource Consultant
402-304-0568
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