Re: We should add a "git gc --auto" after "git clone" due to commit graph

> On Wed, Oct 03, 2018 at 03:18:05PM -0400, Jeff King wrote:
>> I'm still excited about the prospect of a bloom filter for paths which
>> each commit touches. I think that's the next big frontier in getting
>> things like "git log -- path" to a reasonable run-time.
> There is certainly potential there.  With a (very) rough PoC
> experiment, a 8MB bloom filter, and a carefully choosen path I can
> achieve a nice, almost 25x speedup:
>
>    $ time git rev-list --count HEAD -- t/valgrind/valgrind.sh
>    6
>
>    real    0m1.563s
>    user    0m1.519s
>    sys     0m0.045s
>
>    $ time GIT_USE_POC_BLOOM_FILTER=y ~/src/git/git rev-list --count HEAD -- t/valgrind/valgrind.sh
>    6
>
>    real    0m0.063s
>    user    0m0.043s
>    sys     0m0.020s
>
>    bloom filter total queries: 16269 definitely not: 16195 maybe: 74 false positives: 64 fp ratio: 0.003934