On Mon, Jan 20, 2014 at 04:28:45PM -0500, Jeff King wrote:

>   [1/2]: t/perf: time rev-list with UNINTERESTING commits
>   [2/2]: list-objects: only look at cmdline trees with edge_hint
> Here's t/perf/p0001 output that shows the problem:
>   0001.5: rev-list --objects $commit --not --all
>   fbd4a703^         fbd4a703                  HEAD
>   0.04(0.04+0.00)   0.28(0.27+0.00) +600.0%   0.04(0.04+0.00) +0.0%

Those numbers are on git.git. Obviously 600% is a lot, but 24ms is not.
However, the cost is a factor of the tree size times the number of refs.
For the "homebrew.git" repository stored at GitHub, which has ~28,000
refs (mostly pointing at pull-request tips in refs/pull), the numbers
are much more dramatic:

fbd4a703^         fbd4a703                   HEAD                 
0.50(0.46+0.02)   8.23(8.17+0.06) +1546.0%   0.50(0.48+0.01) +0.0%

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