[RFC] pack index lookup performance

[Aaron Bentley]

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Robert Collins wrote:
> Indeed; this is where the hit/miss ratio is useful because hits get
> cached per index, but there is no miss cache at the moment.
> 
> So if you ask a 1-record index that has been fully parsed for 15K keys
> it does not have, it does 15K bisections.

It seems we should be examining the hit caches of all indices before
doing more expensive operations.  Are we doing that?

Aaron
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