On Tue, Jul 02, 2013 at 12:07:58AM -0400, Jeff King wrote:

> And yet another alternative would be to keep the list unsorted during
> the mark_complete calls, and then sort it at the end. Like this:

Amusingly, I seem to have posted the exact same patch last year:


but never polished it up. It does cut a little time off of the initial
ref-loading that fetch-pack does (especially when we do not end up
transferring any objects at all). But it does not solve your problem.

I replicated your test setup, and the problem is that we have many
common objects on both sides during the ref negotiation. So we end up in
rev_list_push for each one, which has the same O(n^2) behavior.
Switching it to just sort at the end is not trivial; we first insert all
of the objects, but then we actually walk the parents, pushing onto the
list as we go. So I think we'd want a better data structure (like a
priority queue).

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