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From: =?UTF-8?B?w4Z2YXIgQXJuZmrDtnLDsCBCamFybWFzb24=?= <avarab@gmail.com>
Subject: Re: Git Scaling: What factors most affect Git performance for a large repo?
Date: Mon, 2 Mar 2015 20:36:43 +0100
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Cc: Duy Nguyen <pclouds@gmail.com>,
	Stephen Morton <stephen.c.morton@gmail.com>,
	Git Mailing List <git@vger.kernel.org>
To: Junio C Hamano <gitster@pobox.com>
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On Fri, Feb 20, 2015 at 10:04 PM, Junio C Hamano <gitster@pobox.com> wr=
ote:
> =C3=86var Arnfj=C3=B6r=C3=B0 Bjarmason <avarab@gmail.com> writes:
>
>> I actually ran this a few times while testing it, so this is a befor=
e
>> and after on a hot cache of linux.git with 406 tags v.s. ~140k. I ra=
n
>> the gc + repack + bitmaps for both repos noted in an earlier reply o=
f
>> 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=3Dshort 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.