Accelerating push via bzr:// and friends

[Aaron Bentley]

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Robert Collins wrote:
> 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).

Well, there are several things.  One is that heads is going really
deep-- when I was pushing a branch of Launchpad, it got back into the
arch-imported history.  So we need to make queries scale up in size to
cope with repetition, and ideally we would change heads to not go so deep.

Aaron
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