[RFC] Faster load of full inventory for development6-rich-root?

[Ian Clatworthy]

Aaron Bentley wrote:

>> If the latter is sufficient, I can skip the path
>> calculations, hence the children lookups, by using iter_just_entries()
>> and sorting by file-id?
> 
> You have to iterate over the whole inventory anyhow.  It shouldn't be a
> win to skip generating paths.

Aaron/John,

So send is 3 times quicker in the latest bzr.dev than it was 2 weeks
ago. It now takes 63 seconds instead of 3+ minutes on OOo. Hooray to
whoever fixed that!

Path calculation is *still* a dominant factor though. As an experiment,
the following patch drops the time down to 32 seconds, simply by
avoiding path calculation while generating a testament sha.

I don't know much about testaments and perhaps this sort of change is
semantically invalid, e.g. it will give different testament sha's for
different inventory formats. So, stepping up a layer, a gather the
purpose of the testament.sha is an integrity check that the receiving
repository think revision X really is the same as what the source
repository thinks it is? Is that right? If so, are there other
alternatives to generating a magic number?

Ian C.
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