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Re: [Gnu-arch-users] [PATCH] arch speedups on big trees


From: Andrew Suffield
Subject: Re: [Gnu-arch-users] [PATCH] arch speedups on big trees
Date: Sat, 20 Dec 2003 01:06:24 +0000
User-agent: Mutt/1.5.4i

On Fri, Dec 19, 2003 at 04:38:34PM -0800, Tom Lord wrote:
> For example, you circumscribed the applicability of your optimization
> with:
> 
>         Adding a file is the exceptional case - we have to scan the
>         whole tree for that. But it doesn't happen very often in
>         general, so that's probably a reasonable cutoff point for the
>         optimisation.
> 
> except that, of course, every changeset in every archive contains at
> least one add.
> 
> Another fun case that just occured to me is going to be auto-generated
> ChangeLogs.   To get those right, a full inventory is needed --
> period.  So, in fact, mason's optimization can't work at all -- nor
> can your variations on it.

Ah, now *those* are actually things I hadn't thought of. I still think
that ignoring those, it's easy and trivially safe.

(I'm not convinced it's particularly hard to do even with those
issues, but nor do I care enough to try any harder than pulling ideas
out of the air)

-- 
  .''`.  ** Debian GNU/Linux ** | Andrew Suffield
 : :' :  http://www.debian.org/ |
 `. `'                          |
   `-             -><-          |

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