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From: Christian Couder <christian.couder@gmail.com>
To: ZheNing Hu <adlternative@gmail.com>
Cc: "ZheNing Hu via GitGitGadget" <gitgitgadget@gmail.com>,
	git <git@vger.kernel.org>, "Junio C Hamano" <gitster@pobox.com>,
	"Hariom Verma" <hariom18599@gmail.com>,
	"Bagas Sanjaya" <bagasdotme@gmail.com>,
	"Jeff King" <peff@peff.net>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [PATCH 12/15] [GSOC] cat-file: reuse ref-filter logic
Date: Fri, 2 Jul 2021 15:45:13 +0200	[thread overview]
Message-ID: <CAP8UFD0P5eiwxKvot_5+izEjscyGw+F4QFN72BmgHNhi9V5S1w@mail.gmail.com> (raw)
In-Reply-To: <877di8al8n.fsf@evledraar.gmail.com>

On Fri, Jul 2, 2021 at 3:39 PM Ævar Arnfjörð Bjarmason <avarab@gmail.com> wrote:
>
> On Thu, Jul 01 2021, ZheNing Hu via GitGitGadget wrote:

> > The performance for `git cat-file --batch-all-objects
> > --batch-check` on the Git repository itself with performance
> > testing tool `hyperfine` changes from 669.4 ms ±  31.1 ms to
> > 1.134 s ±  0.063 s.
> >
> > The performance for `git cat-file --batch-all-objects --batch
> >>/dev/null` on the Git repository itself with performance testing
> > tool `time` change from "27.37s user 0.29s system 98% cpu 28.089
> > total" to "33.69s user 1.54s system 87% cpu 40.258 total".
>
> This new feature is really nice, but that's a really bad performance
> regression. A lot of software in the wild relies on "cat-file --batch"
> to be *the* performant interface to git for mass-extrction of object
> data.
>
> That's in increase of ~70% and ~20%, respectively. Have you dug into
> (e.g. with a profiler) where we're now spending all this time?

Yeah, I think it's better to discuss this performance issue as part of
the discussion of this series, instead of as part of the discussion of
the blog posts.

  reply	other threads:[~2021-07-02 13:45 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-01 16:07 [PATCH 00/15] [GSOC] cat-file: reuse ref-filter logic ZheNing Hu via GitGitGadget
2021-07-01 16:07 ` [PATCH 01/15] [GSOC] ref-filter: add obj-type check in grab contents ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 02/15] [GSOC] ref-filter: add %(raw) atom ZheNing Hu via GitGitGadget
2021-07-02 13:22   ` Ævar Arnfjörð Bjarmason
2021-07-03  5:14     ` ZheNing Hu
2021-07-01 16:08 ` [PATCH 03/15] [GSOC] ref-filter: --format=%(raw) re-support --perl ZheNing Hu via GitGitGadget
2021-07-02 13:29   ` Ævar Arnfjörð Bjarmason
2021-07-03  5:14     ` ZheNing Hu
2021-07-01 16:08 ` [PATCH 04/15] [GSOC] ref-filter: use non-const ref_format in *_atom_parser() ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 05/15] [GSOC] ref-filter: add %(rest) atom ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 06/15] [GSOC] ref-filter: pass get_object() return value to their callers ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 07/15] [GSOC] ref-filter: introduce free_ref_array_item_value() function ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 08/15] [GSOC] ref-filter: add cat_file_mode in struct ref_format ZheNing Hu via GitGitGadget
2021-07-02 13:32   ` Ævar Arnfjörð Bjarmason
2021-07-02 19:28     ` Eric Sunshine
2021-07-02 22:11       ` Christian Couder
2021-07-03  5:55         ` ZheNing Hu
2021-07-05  7:17           ` Ævar Arnfjörð Bjarmason
2021-07-01 16:08 ` [PATCH 09/15] [GSOC] ref-filter: modify the error message and value in get_object ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 10/15] [GSOC] cat-file: add has_object_file() check ZheNing Hu via GitGitGadget
2021-07-02 13:34   ` Ævar Arnfjörð Bjarmason
2021-07-03  5:50     ` ZheNing Hu
2021-07-01 16:08 ` [PATCH 11/15] [GSOC] cat-file: change batch_objects parameter name ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 12/15] [GSOC] cat-file: reuse ref-filter logic ZheNing Hu via GitGitGadget
2021-07-02 13:36   ` Ævar Arnfjörð Bjarmason
2021-07-02 13:45     ` Christian Couder [this message]
2021-07-03 11:45     ` ZheNing Hu
2021-07-03 13:37       ` Ævar Arnfjörð Bjarmason
2021-07-04 11:10         ` ZheNing Hu
2021-07-05  7:18           ` Ævar Arnfjörð Bjarmason
2021-07-03 14:17       ` ZheNing Hu
2021-07-01 16:08 ` [PATCH 13/15] [GSOC] cat-file: reuse err buf in batch_object_write() ZheNing Hu via GitGitGadget
2021-07-01 16:08 ` [PATCH 14/15] [GSOC] cat-file: re-implement --textconv, --filters options ZheNing Hu via GitGitGadget
2021-07-01 19:55   ` Junio C Hamano
2021-07-01 20:11   ` Junio C Hamano
2021-07-02 12:46     ` ZheNing Hu
2021-07-02 15:27       ` Junio C Hamano
2021-07-03  6:17         ` ZheNing Hu
2021-07-01 16:08 ` [PATCH 15/15] [GSOC] ref-filter: remove grab_oid() function ZheNing Hu via GitGitGadget

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