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Date:   Thu, 4 Apr 2019 17:20:48 +0900
From:   Mike Hommey <mh@glandium.org>
To:     Christian Couder <christian.couder@gmail.com>
Cc:     Matheus Tavares Bernardino <matheus.bernardino@usp.br>,
        git <git@vger.kernel.org>, Jeff King <peff@peff.net>,
        Duy Nguyen <pclouds@gmail.com>,
        Thomas Gummerer <t.gummerer@gmail.com>,
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        <olyatelezhnaya@gmail.com>, Elijah Newren <newren@gmail.com>,
        Tanushree Tumane <tanushreetumane@gmail.com>,
        David Kastrup <dak@gnu.org>
Subject: Re: Questions on GSoC 2019 Ideas
Message-ID: <20190404082048.bocecevbaqfgfmsu@glandium.org>
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On Thu, Apr 04, 2019 at 09:56:35AM +0200, Christian Couder wrote:
> Hi,
> 
> On Thu, Apr 4, 2019 at 3:15 AM Matheus Tavares Bernardino
> <matheus.bernardino@usp.br> wrote:
> >
> > I've been studying the codebase and looking for older emails in the ML
> > that discussed what I want to propose as my GSoC project. In
> > particular, I found a thread about slow git commands on chromium, so I
> > reached them out at chromium's ML to ask if it's still an issue. I got
> > the following answer:
> >
> > On Wed, Apr 3, 2019 at 1:41 PM Erik Chen <erikchen@chromium.org> wrote:
> > > Yes, this is absolutely still a problem for Chrome. I filed some bugs for common operations that are slow for Chrome: git blame [1], git stash [2], git status [3]
> > > On Linux, blame is the only operation that is really problematic. On macOS and Windows ... it's hard to find a git operation that isn't slow. :(
> 
> Nice investigation. About git status I wonder though if they have
> tried the possible optimizations, like untracked cache or
> core.fsmonitor.

Note that one known issue on macOS specifically on large repos is that
the number of files explodes the inode cache in the kernel, and lstat
becomes slow.

e.g. https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/p9U4jqz8kxo

Mike