On Fri, Feb 20, 2015 at 10:04 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx> writes:
>
>> I actually ran this a few times while testing it, so this is a before
>> and after on a hot cache of linux.git with 406 tags v.s. ~140k. I ran
>> the gc + repack + bitmaps for both repos noted in an earlier reply of
>> mine, and took the fastest run out of 3:
>>
>> $ time (git log master -100 >/dev/null)
>> Before: real 0m0.021s
>> After: real 0m2.929s
>
> Do you force --decorate with some config? Or do you see similar
> performance difference with "git rev-parse master", too?
Yes, I had log.decorate=short set in my config. With --no-decorate:
$ time (git log --no-decorate -100 >/dev/null)
# Before: real 0m0.010s
# After: real 0m0.065s
>> $ time (git status >/dev/null)
>> # Around 150ms, no noticeable difference
>
> This is understandable, as it will not look at any ref other than
> HEAD.
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