From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Wed, 23 Jan 2008 12:25:41 GMT
Subject: Re: I'm a total push-over..
Message-ID: <alpine.LSU.1.00.0801231224300.5731@racer.site>
In-Reply-To: <7vprvtngxk.fsf@gitster.siamese.dyndns.org>

Hi,

On Tue, 22 Jan 2008, Junio C Hamano wrote:

> Linus Torvalds <torvalds@linux-foundation.org> writes:
> 
> > Basically, I dislike having two copies of the same data. If something 
> > can be computed from something else, then only the original data 
> > should exist, and the other thing should be recomputed.
> 
> Yes, I agree with that in principle. Storing computable values makes 
> sense only when it is expensive to recompute.  We did not have 
> cache-tree for quite a long time until you noticed that it was rather 
> expensive and wasteful to recompute tree objects from unchanged parts of 
> the index every time.
> 
> It's the same argument; when the hashing performance starts to become 
> noticeable, we can think about storing and reusing it, not before.

I fully expect it to be noticable with that UTF-8 "normalisation".  But 
then, the infrastructure is there, and whoever has an itch to scratch...

Ciao,
Dscho