branching via hard links

[Aaron Bentley]

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John A Meinel wrote:
> You still have the speed gain. The problem is that building a working
> tree is still slow with bzr. (It takes about 10s to build the bzr source
> tree).
> 
> I haven't investigated why. I'm thinking it is because Aaron worked
> really hard to make TreeTransform correct and complete, and we haven't
> focused on making it fast yet.

That's probably right.  One piece of overhead is that it always checks
for conflicts.  Unfortunately, now that checkouts can be made in
non-empty directories, conflict checking is required.

Still, you could try commenting-out the find_conflicts call in
TreeTransform.apply, to see if that's even the problem.

Aaron
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