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Re: SVN_STREAM_CHUNK_SIZE way too low?

From: Greg Stein <gstein_at_lyra.org>
Date: 2002-02-08 23:03:56 CET

On Fri, Feb 08, 2002 at 04:43:47PM -0500, Greg Hudson wrote:
> After some thought, I have a question: how is a delta combiner going to
> improve our performance?

The theory is that you can combine a series of (small) deltas into a single
delta. Then you grab the fulltext and apply the one delta. Right now, we
produce intermediate fulltexts as we apply each delta in turn. If those
fulltexts spill outside of a window size, then everything goes to hell
(which is why we disable deltas for sources larger than the window).

I think the win comes with the presumption of the deltas being smaller than
the fulltext (they sure better be :-). Since they're smaller, you can work
with them, without needing to resort to the fulltext.


Greg Stein, http://www.lyra.org/
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Received on Sat Oct 21 14:37:05 2006

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