Knits vs Weaves

[Robert Collins]

On Thu, 2006-02-16 at 22:10 -0500, Aaron Bentley wrote:


> To be honest, I don't understand why network operations are blazing fast
> with knits.  Perhaps someone else can fill us in?

AIUI there are three reasons:
 firstly there is less data to shift around. So the network operation is
smaller.
 secondly the signatures and revisions are in a knit too, so rather than
many thousand times RTT penalty, you pay approximately 3 * RTT
(inventory + revision + signatures) + file_id_count * RTT.
 thirdly there is a pregenerated revision delta as part of the versioned
file api which provides a list of the required revision-fileid pairs. A
precalculated form of file_id_involved, if you like. That is probably
buggy at the moment depending as it does on compare_trees rather than a
compare_revisions [or equivalent] api.

Rob

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