svn-import performance analysis

[Robert Collins]

On Tue, 2008-12-02 at 19:48 +0100, Jelmer Vernooij wrote:
> I've done some work analysing the critical points in importing from
> Subversion using bzr-svn 0.5. 
> 
> The main culprits appear to be:
> 
>  * Inventory.copy() (33%)
>  * Repository.add_revision() (49%) (most of which is spent serialising
> the inventory)
> 
> While fetching a revision delta, bzr-svn makes a copy of the inventory
> of the parent revision and applies the changes it sees to that. It needs
> the previous inventory as well to figure out renames and the like in
> roundtripped revisions.
> 
> I'm at a bit of a loss as to how I can optimize this further. Does
> anybody have any ideas? Also, I would expect CHK inventories to be of
> help here - is that correct?

use apply_inventory_delta (there is a patch on BB with this in it), and
it should be about the same on xml, but much faster on
split-inventories.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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