Accelerating push via bzr:// and friends

[Robert Collins]

On Tue, 2008-05-20 at 08:39 -0400, Aaron Bentley wrote:
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> Andrew Bennetts wrote:
> > Initial tests suggest that bzr.dev has regressed a bit since 1.4!
> 
> I noticed that on Friday.  A lot of these get_parent_map calls are being
> done for heads, and John's recently done a lot of work to make heads
> more thorough and accurate, so that may be the cause.

This seems likely - its why I emphasised doing one and one one query per
loop as an important goal in the graph code (because while pack indices
may be a touch slow, network latency is even higher).

-Rob
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