From: Elijah Newren <newren@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "John Cai via GitGitGadget" <gitgitgadget@gmail.com>,
git@vger.kernel.org, "Eric Sunshine" <sunshine@sunshineco.com>,
"Phillip Wood" <phillip.wood123@gmail.com>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"Jeff King" <peff@peff.net>, "John Cai" <johncai86@gmail.com>
Subject: Re: [PATCH v4 0/2] Teach diff to honor diff algorithms set through git attributes
Date: Tue, 21 Feb 2023 10:05:50 -0800 [thread overview]
Message-ID: <CABPp-BEAB6jKXeo=DHiimQUDj=5i7U5MQPXTEsAagLVAuk7FOQ@mail.gmail.com> (raw)
In-Reply-To: <xmqq5ybuhqhc.fsf@gitster.g>
On Tue, Feb 21, 2023 at 9:34 AM Junio C Hamano <gitster@pobox.com> wrote:
>
> "John Cai via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
> > When a repository contains different kinds of files, it may be desirable to
> > use different algorithms based on file type. This is currently not feasible
> > through the command line or using git configs. However, we can leverage the
> > fact that gitattributes are path aware.
> > ...
> > To address some of the performance concerns in the previous series, a
> > benchmark shows that now only a minor performance penalty is incurred, now
> > that we are no longer adding an additional attributes parsing call:
> >
> > $ echo "*.[ch] diff=other" >> .gitattributes $ hyperfine -r 10 -L a
> > git-bin-wrapper,git '{a} -c diff.other.algorithm=myers diff v2.0.0 v2.28.0'
> > Benchmark 1: git-bin-wrapper -c diff.other.algorithm=myers diff v2.0.0
> > v2.28.0 Time (mean ± σ): 716.3 ms ± 3.8 ms [User: 660.2 ms, System: 50.8 ms]
> > Range (min … max): 709.8 ms … 720.6 ms 10 runs
> >
> > Benchmark 2: git -c diff.other.algorithm=myers diff v2.0.0 v2.28.0 Time
> > (mean ± σ): 704.3 ms ± 2.9 ms [User: 656.6 ms, System: 44.3 ms] Range (min …
> > max): 700.1 ms … 708.6 ms 10 runs
> >
> > Summary 'git -c diff.other.algorithm=myers diff v2.0.0 v2.28.0' ran 1.02 ±
> > 0.01 times faster than 'git-bin-wrapper -c diff.other.algorithm=myers diff
> > v2.0.0 v2.28.0'
>
> Hopefully this round can immediately be merged down to 'next'?
> Thanks.
I'll leave that up to you and John, but are we risking merging code
that could go unused or that we need to fundamentally change? I don't
see how to handle the issues over at
https://lore.kernel.org/git/647D3D49-B85B-4B66-A857-695CFF9685EE@gmail.com/
(not that I've spent much thought on it besides asking how things are
going to work), and would be worried that we'd end up needing to
change the mechanism somehow to cover the things John ultimately
wants.
next prev parent reply other threads:[~2023-02-21 18:06 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-05 3:46 [PATCH 0/2] Teach diff to honor diff algorithms set through git attributes John Cai via GitGitGadget
2023-02-05 3:46 ` [PATCH 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-06 16:20 ` Phillip Wood
2023-02-05 3:46 ` [PATCH 2/2] diff: teach diff to read gitattribute diff-algorithm John Cai via GitGitGadget
2023-02-05 17:50 ` Eric Sunshine
2023-02-06 13:10 ` John Cai
2023-02-06 16:27 ` Phillip Wood
2023-02-06 18:14 ` Eric Sunshine
2023-02-06 19:50 ` John Cai
2023-02-09 8:26 ` Elijah Newren
2023-02-09 10:31 ` "bad" diffs (was: [PATCH 2/2] diff: teach diff to read gitattribute diff-algorithm) Ævar Arnfjörð Bjarmason
2023-02-09 16:37 ` [PATCH 2/2] diff: teach diff to read gitattribute diff-algorithm John Cai
2023-02-06 16:39 ` Ævar Arnfjörð Bjarmason
2023-02-06 20:37 ` John Cai
2023-02-07 14:55 ` Phillip Wood
2023-02-07 17:00 ` John Cai
2023-02-09 9:09 ` Elijah Newren
2023-02-09 14:44 ` Phillip Wood
2023-02-10 9:57 ` Elijah Newren
2023-02-11 17:39 ` Phillip Wood
2023-02-11 1:59 ` Jeff King
2023-02-15 2:35 ` Elijah Newren
2023-02-15 4:21 ` Jeff King
2023-02-15 5:20 ` Junio C Hamano
2023-02-15 14:44 ` Phillip Wood
2023-02-15 15:00 ` Jeff King
2023-02-07 17:27 ` Ævar Arnfjörð Bjarmason
2023-02-15 14:47 ` Phillip Wood
2023-02-09 8:44 ` Elijah Newren
2023-02-14 21:16 ` John Cai
2023-02-15 3:41 ` Elijah Newren
2023-02-09 7:50 ` Elijah Newren
2023-02-09 9:41 ` Ævar Arnfjörð Bjarmason
2023-02-11 2:04 ` Jeff King
2023-02-07 17:56 ` Jeff King
2023-02-07 20:18 ` Ævar Arnfjörð Bjarmason
2023-02-07 20:47 ` Junio C Hamano
2023-02-07 21:05 ` Ævar Arnfjörð Bjarmason
2023-02-07 21:28 ` Junio C Hamano
2023-02-07 21:44 ` Ævar Arnfjörð Bjarmason
2023-02-09 16:34 ` John Cai
2023-02-11 1:39 ` Jeff King
2023-02-14 21:40 ` [PATCH v2 0/2] Teach diff to honor diff algorithms set through git attributes John Cai via GitGitGadget
2023-02-14 21:40 ` [PATCH v2 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-15 2:38 ` Junio C Hamano
2023-02-15 23:34 ` John Cai
2023-02-15 23:42 ` Junio C Hamano
2023-02-16 2:14 ` Jeff King
2023-02-16 2:57 ` Junio C Hamano
2023-02-16 20:34 ` John Cai
2023-02-14 21:40 ` [PATCH v2 2/2] diff: teach diff to read gitattribute diff-algorithm John Cai via GitGitGadget
2023-02-15 2:56 ` Junio C Hamano
2023-02-15 3:20 ` Junio C Hamano
2023-02-16 20:37 ` John Cai
2023-02-17 20:21 ` [PATCH v3 0/2] Teach diff to honor diff algorithms set through git attributes John Cai via GitGitGadget
2023-02-17 20:21 ` [PATCH v3 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-17 21:27 ` Junio C Hamano
2023-02-18 1:36 ` Elijah Newren
2023-02-17 20:21 ` [PATCH v3 2/2] diff: teach diff to read algorithm from diff driver John Cai via GitGitGadget
2023-02-17 21:50 ` Junio C Hamano
2023-02-18 2:56 ` Elijah Newren
2023-02-20 15:32 ` John Cai
2023-02-20 16:21 ` Elijah Newren
2023-02-20 16:49 ` John Cai
2023-02-20 17:32 ` Elijah Newren
2023-02-20 20:53 ` John Cai
2023-02-22 19:47 ` Jeff King
2023-02-24 17:44 ` John Cai
2023-02-18 1:16 ` [PATCH v3 0/2] Teach diff to honor diff algorithms set through git attributes Elijah Newren
2023-02-20 13:37 ` John Cai
2023-02-20 21:04 ` [PATCH v4 " John Cai via GitGitGadget
2023-02-20 21:04 ` [PATCH v4 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-20 21:04 ` [PATCH v4 2/2] diff: teach diff to read algorithm from diff driver John Cai via GitGitGadget
2023-02-21 17:34 ` [PATCH v4 0/2] Teach diff to honor diff algorithms set through git attributes Junio C Hamano
2023-02-21 18:05 ` Elijah Newren [this message]
2023-02-21 18:51 ` Junio C Hamano
2023-02-21 19:36 ` John Cai
2023-02-21 20:16 ` Elijah Newren
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