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Date:   Wed, 14 Sep 2016 21:46:43 +0200
From:   Heiko Voigt <hvoigt@hvoigt.net>
To:     Jeff King <peff@peff.net>
Cc:     Stefan Beller <sbeller@google.com>,
        Junio C Hamano <gitster@pobox.com>,
        "git@vger.kernel.org" <git@vger.kernel.org>,
        Jens Lehmann <Jens.Lehmann@web.de>,
        Fredrik Gustafsson <iveqy@iveqy.com>,
        Leandro Lucarella <leandro.lucarella@sociomantic.com>
Subject: Re: [PATCH 2/2] serialize collection of refs that contain submodule
 changes
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On Wed, Sep 14, 2016 at 07:51:30PM +0200, Heiko Voigt wrote:
> Here are some numbers (using the my development clone of git
> itself) from my local machine:
> 
> rm -rf <test-git> && mkdir <test-git> &&
> (cd <test-git> && git init) &&
> time git push --mirror <test-git>
> 
>    real	0m16.056s
>    user	0m24.424s
>    sys	0m1.380s
> 
>    real	0m15.885s
>    user	0m24.204s
>    sys	0m1.296s
> 
>    real	0m16.731s
>    user	0m24.176s
>    sys	0m1.244s
> 
> rm -rf <test-git> && mkdir <test-git> &&
> (cd <test-git> && git init) &&
> time git push --mirror --recurse-submodules=check <test-git>
> 
>    real	0m21.441s
>    user	0m29.560s
>    sys	0m1.480s
> 
>    real	0m21.319s
>    user	0m29.484s
>    sys	0m1.464s
> 
>    real	0m21.261s
>    user	0m29.252s
>    sys	0m1.592s
> 
> Without my patches and --recurse-submodules=check the numbers are
> basically the same. I stopped the test with --recurse-submodules=check
> after ~ 9 minutes.

Fun fact, I let the push without my patch and with
--recurse-submodules=check finish:

real	27m7.962s
user	27m15.568s
sys	0m2.016s

Thats quite some time...

Cheers Heiko