~bzr-pqm/bzr/bzr.dev

performance notes and measurements

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small but significant improvement from Python -O

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Loading a large inventory through cElementTree is pretty quick; only

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about 0.117s. By contrast reading the inventory into our data

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structure takes about 0.7s.

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So I think the problem must be in converting everything to

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InventoryEntries and back again every time.

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Thought about that way it seems pretty inefficient: why create all

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those objects when most of them aren't called on most invocations?

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Instead perhaps the Inventory object should hold the ElementTree and

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pull things out of it only as necessary? We can even have an index

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pointing into the ElementTree by id, path, etc.