From: Junio C Hamano <gitster@pobox.com>
Date: Fri, 20 Feb 2015 21:04:30 GMT
Subject: Re: Git Scaling: What factors most affect Git performance for a large repo?
Message-ID: <xmqqa908z44h.fsf@gitster.dls.corp.google.com>
In-Reply-To: <CACBZZX45eCo6YS4EpHvMQjN32+-w5BztfoLiwh_rJTs7FydgoQ@mail.gmail.com>

Ævar Arnfjörð Bjarmason <avarab@gmail.com> 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?

>     $ time (git status >/dev/null)
>     # Around 150ms, no noticeable difference

This is understandable, as it will not look at any ref other than
HEAD.