[MERGE] Make bzr log FILE faster by looking up text_keys one at a time.

[John Arbash Meinel]

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Gary van der Merwe wrote:
> Hi
> 
> I stumbled on the fact that by looking up text indexes one at a time
> is much faster than looking up a bunch of them. By doing this, we can
> make bzr log FILE faster.
> 
> Tests with --ls-prof showed a 44% improvement for "bzr log
> bzrlib\tree.py >dev/nul"
> 
> Gary
> 

I wouldn't really trust --lsprof testing of this, as it overly penalizes the
index code for our current indexes. Can you test this without --lsprof and see
if it still shows improvement?

I'm also concerned that our next index format will do as you expect, and
actually *be faster* when doing a batch request.

Otherwise, this certainly seems worth merging.

Also, you might try both before and after running 'bzr pack' on your repository.

John
=:->

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