From: Nguyen Thai Ngoc Duy <pclouds@gmail.com>
Date: Mon, 29 Aug 2011 07:41:45 GMT
Subject: Re: What's the difference between `git show branch:file | diff -u - file` vs `git diff branch file`?
Message-ID: <CACsJy8DMqjMfb5wVMnsrZhP8yv2rF1wyQ6LM6b-PVcYY1SXkcQ@mail.gmail.com>
In-Reply-To: <loom.20110823T091132-107@post.gmane.org>

On Tue, Aug 23, 2011 at 2:25 PM, Marat Radchenko <marat@slonopotamus.org> wrote:
> $ time git show branch:file | diff -u - file > /dev/null
>
> real    0m0.003s
> user    0m0.000s
> sys     0m0.000s
>
> $ time git diff branch -- file > /dev/null
>
> real    0m31.442s
> user    0m31.040s
> sys     0m0.380s
>
> What does git diff do so it takes that much time?

You said elsewhere in this thread this is private repo, so some more questions:

 - is "file" above at top repo, or is it actually very/deep/path/to/a/file?
 - how many entries in the tree that contain "file"?
 - how is "git ls-files | wc -l"?
 - how about "time git diff branch another-branch -- file >/dev/null"?
That'd remove unpack-trees code.
-- 
Duy