[MERGE] log|less 590% to 727% faster

[Aaron Bentley]

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John Arbash Meinel wrote:
>>> IIRC, the issue is that we want to avoid importing tokenize, because of
>>> its various and funky regexes.  Which we should be able to accomplish
>>> using this method, right?
> 
> Yep. I specifically did:
> demandload(globals(), 'inspect tokenize')
> sys.modules['inspect'] = inspect
> sys.modules['tokenize'] = tokenize
> 
> The way this demandload works is that when someone grabs an attribute,
> it replaces itself. There is a problem with my module hacking version,
> which means that 'copy()' will always be going through an attribute to
> get to 'inspect'.

I thought the only problem with inspect was that it imported tokenize,
which demandloading would fix.  No?

> Yeah, I agree. I don't think my demandload branch is good for merging.
> But I think we can look into doing it right now that I have experience
> with what is actually costing us time.
> 
> The first pass would be to include my custom importer, which lets us run
> 'bzr --profile-imports foo', and records the amount of time compiling
> all regexes, and importing objects.

That sounds very useful.

Aaron
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