From: Junio C Hamano <gitster@pobox.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: git@vger.kernel.org, Nguyen Thai Ngoc Duy <pclouds@gmail.com>
Subject: Re: [PATCH 0/3] Un-pessimize "diff-index $commit -- $pathspec"
Date: Mon, 29 Aug 2011 15:05:56 -0700 [thread overview]
Message-ID: <7v1uw36fgb.fsf@alter.siamese.dyndns.org> (raw)
In-Reply-To: <CA+55aFzk+hn9wMAp3H92SHAGO8CQVBpTsmR41FgCy32T7muUzA@mail.gmail.com> (Linus Torvalds's message of "Mon, 29 Aug 2011 14:56:02 -0700")
Linus Torvalds <torvalds@linux-foundation.org> writes:
> On Mon, Aug 29, 2011 at 2:33 PM, Junio C Hamano <gitster@pobox.com> wrote:
>>
>> Before and after applying this series, looking for changes in the kernel
>> repository with a fairly narrow pathspec gets a moderate speeds up.
>
> "moderate speeds up"?
>
> Looks like a big win to me. Admittedly it's already a pretty fast
> operation, but script it and repeat it a million times, and that will
> matter a lot more.
>
> I guess the "--raw" diff part means that you are hiding the time to
> make a real diff, which would otherwise swamp everything else. Even
> so, this looks like a good improvement.
The topic started by Marat Radchenko in
http://thread.gmane.org/gmane.comp.version-control.git/179926
who was trying to pick a single path (we do not know how deep it is), and
was comparing between these two:
$ 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
Replacing "diff -u" with "git diff --no-index" in the former didn't make
much of a difference. It turned out that Marat had 603k paths in the index
and the most of the time was spent in the unpack machinery.
next prev parent reply other threads:[~2011-08-29 22:06 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-23 7:25 What's the difference between `git show branch:file | diff -u - file` vs `git diff branch file`? Marat Radchenko
2011-08-23 10:03 ` Michael J Gruber
2011-08-23 10:52 ` Marat Radchenko
2011-08-23 15:20 ` Michael Witten
2011-08-23 15:34 ` Michael J Gruber
2011-08-23 16:45 ` Marat Radchenko
2011-08-23 17:15 ` Junio C Hamano
2011-08-23 18:21 ` Marat Radchenko
2011-08-23 20:07 ` Michael J Gruber
2011-08-25 16:09 ` Marat Radchenko
2011-08-25 21:10 ` Junio C Hamano
2011-08-26 9:43 ` Marat Radchenko
2011-08-29 7:41 ` Nguyen Thai Ngoc Duy
2011-08-29 14:48 ` Marat Radchenko
2011-08-29 16:09 ` Nguyen Thai Ngoc Duy
2011-08-29 17:18 ` Junio C Hamano
2011-08-29 20:42 ` Junio C Hamano
2011-08-29 20:50 ` Junio C Hamano
2011-08-29 21:09 ` Junio C Hamano
2011-08-29 21:33 ` [PATCH 0/3] Un-pessimize "diff-index $commit -- $pathspec" Junio C Hamano
2011-08-29 21:33 ` [PATCH 1/3] traverse_trees(): allow pruning with pathspec Junio C Hamano
2011-08-30 12:53 ` Nguyen Thai Ngoc Duy
2011-08-30 17:44 ` Junio C Hamano
2011-08-31 1:35 ` Nguyen Thai Ngoc Duy
2011-10-09 15:39 ` Michael Haggerty
2011-10-09 21:35 ` Nguyen Thai Ngoc Duy
2011-10-10 4:42 ` Michael Haggerty
2011-08-29 21:33 ` [PATCH 2/3] unpack-trees: " Junio C Hamano
2011-08-30 13:03 ` Nguyen Thai Ngoc Duy
2011-08-30 17:32 ` Junio C Hamano
2011-08-30 15:24 ` David Michael Barr
2011-08-29 21:33 ` [PATCH 3/3] diff-index: pass pathspec down to unpack-trees machinery Junio C Hamano
2012-01-11 6:31 ` Jonathan Nieder
2012-01-11 8:05 ` Junio C Hamano
2012-01-11 12:33 ` Nguyen Thai Ngoc Duy
2012-01-11 12:47 ` Nguyen Thai Ngoc Duy
2012-01-11 20:40 ` Junio C Hamano
2012-01-12 4:09 ` [PATCH] tree_entry_interesting: make recursive mode default Nguyễn Thái Ngọc Duy
2012-01-12 5:04 ` Junio C Hamano
2012-01-12 5:44 ` Nguyen Thai Ngoc Duy
2012-01-14 9:23 ` [PATCH v2 1/2] Document limited recursion pathspec matching with wildcards Nguyễn Thái Ngọc Duy
2012-01-14 9:23 ` [PATCH v2 2/2] tree_entry_interesting: make recursive mode default Nguyễn Thái Ngọc Duy
2012-01-15 3:12 ` Junio C Hamano
2012-01-15 10:03 ` Nguyen Thai Ngoc Duy
2012-01-16 22:15 ` Junio C Hamano
2012-01-18 8:59 ` Nguyen Thai Ngoc Duy
2012-01-15 2:38 ` [PATCH v2 1/2] Document limited recursion pathspec matching with wildcards Junio C Hamano
2012-01-15 9:48 ` Nguyen Thai Ngoc Duy
2011-08-29 21:56 ` [PATCH 0/3] Un-pessimize "diff-index $commit -- $pathspec" Linus Torvalds
2011-08-29 22:05 ` Junio C Hamano [this message]
2011-08-29 22:11 ` Linus Torvalds
2011-08-29 23:42 ` Junio C Hamano
2011-08-30 6:16 ` Marat Radchenko
2011-08-31 0:18 ` Junio C Hamano
2011-08-30 10:04 ` Michael J Gruber
2011-08-30 17:03 ` Junio C Hamano
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