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Re: optimizing fsfs: reverse diffs?

From: Alan Grow <agrow_at_thegotonerd.com>
Date: 2005-04-08 19:13:04 CEST

On Fri, Apr 08, 2005 at 12:56:56PM -0400, Daniel Berlin wrote:
> We don't want previous revisions to be modified, we want them completely
> read-only and immutable.

The intent of this makes a lot of sense. While I don't see that previous revisions would need to be "redeltified" under a reverse-diff-back-from-HEAD scheme, it's true that their delta chain changes as HEAD changes. Apparently, this must really matter under the svn client-server model.

> 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.

Alan Grow
Software Engineer / 
Opensource Consultant
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Received on Fri Apr 8 20:15:45 2005

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