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From: Junio C Hamano <gitster@pobox.com>
To: Christian Couder <christian.couder@gmail.com>
Cc: "ZheNing Hu via GitGitGadget" <gitgitgadget@gmail.com>,
	git <git@vger.kernel.org>, "Hariom Verma" <hariom18599@gmail.com>,
	"Bagas Sanjaya" <bagasdotme@gmail.com>,
	"Jeff King" <peff@peff.net>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Eric Sunshine" <sunshine@sunshineco.com>,
	"ZheNing Hu" <adlternative@gmail.com>
Subject: Re: [PATCH 14/19] [GSOC] cat-file: reuse ref-filter logic
Date: Mon, 12 Jul 2021 13:38:31 -0700	[thread overview]
Message-ID: <xmqqtukz2rp4.fsf@gitster.g> (raw)
In-Reply-To: <CAP8UFD0vHw8cK90RbOUcrAcxNKiHVTMX0VEiK8+MNyHH0CNm4A@mail.gmail.com> (Christian Couder's message of "Mon, 12 Jul 2021 15:17:33 +0200")

Christian Couder <christian.couder@gmail.com> writes:

>> 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".
>
> Saying that a later patch will add a fast path which will mitigate the
> performance regression introduced by this patch might help reassure
> reviewers.

More importantly, why is such a fast-path even needed?  Isn't it a
sign that the ref-filter implementation is eating more cycles than
it should for given set of placeholders?  Do we know where the extra
cycles goes?

I find it somewhat alarming if we are talking about "fast-path"
workaround before understanding why we are seeing slowdown in the
first place.

  parent reply	other threads:[~2021-07-12 20:38 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12 11:46 [PATCH 00/19] [GSOC] cat-file: reuse ref-filter logic ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 01/19] cat-file: handle trivial --batch format with --batch-all-objects ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 02/19] cat-file: merge two block into one ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 03/19] [GSOC] ref-filter: add obj-type check in grab contents ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 04/19] [GSOC] ref-filter: add %(raw) atom ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 05/19] [GSOC] ref-filter: --format=%(raw) re-support --perl ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 06/19] [GSOC] ref-filter: use non-const ref_format in *_atom_parser() ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 07/19] [GSOC] ref-filter: add %(rest) atom ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 08/19] [GSOC] ref-filter: pass get_object() return value to their callers ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 09/19] [GSOC] ref-filter: introduce free_ref_array_item_value() function ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 10/19] [GSOC] ref-filter: introduce reject_atom() ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 11/19] [GSOC] ref-filter: modify the error message and value in get_object ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 12/19] [GSOC] cat-file: add has_object_file() check ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 13/19] [GSOC] cat-file: change batch_objects parameter name ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 14/19] [GSOC] cat-file: reuse ref-filter logic ZheNing Hu via GitGitGadget
2021-07-12 13:17   ` Christian Couder
2021-07-12 13:26     ` Christian Couder
2021-07-12 13:51       ` ZheNing Hu
2021-07-12 13:49     ` ZheNing Hu
2021-07-12 20:38     ` Junio C Hamano [this message]
2021-07-14 16:24       ` ZheNing Hu
2021-07-15  1:53         ` ZheNing Hu
2021-07-15  9:45           ` Christian Couder
2021-07-15 13:53             ` ZheNing Hu
2021-07-15 14:55     ` ZheNing Hu
2021-07-12 11:46 ` [PATCH 15/19] [GSOC] cat-file: reuse err buf in batch_object_write() ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 16/19] [GSOC] cat-file: re-implement --textconv, --filters options ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 17/19] [GSOC] ref-filter: remove grab_oid() function ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 18/19] [GSOC] cat-file: create p1006-cat-file.sh ZheNing Hu via GitGitGadget
2021-07-12 11:46 ` [PATCH 19/19] [GSOC] cat-file: use fast path when using default_format ZheNing Hu via GitGitGadget
2021-07-12 12:36 ` [PATCH 00/19] [GSOC] cat-file: reuse ref-filter logic Christian Couder
2021-07-12 13:01   ` ZheNing Hu
2021-07-12 13:02 ` Philip Oakley
2021-07-12 13:27   ` ZheNing Hu
2021-07-15 15:40 ` [PATCH v2 00/17] " ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 01/17] [GSOC] ref-filter: add obj-type check in grab contents ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 02/17] [GSOC] ref-filter: add %(raw) atom ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 03/17] [GSOC] ref-filter: --format=%(raw) re-support --perl ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 04/17] [GSOC] ref-filter: use non-const ref_format in *_atom_parser() ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 05/17] [GSOC] ref-filter: add %(rest) atom ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 06/17] [GSOC] ref-filter: pass get_object() return value to their callers ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 07/17] [GSOC] ref-filter: introduce free_ref_array_item_value() function ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 08/17] [GSOC] ref-filter: add cat_file_mode to ref_format ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 09/17] [GSOC] ref-filter: modify the error message and value in get_object ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 10/17] [GSOC] cat-file: add has_object_file() check ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 11/17] [GSOC] cat-file: change batch_objects parameter name ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 12/17] [GSOC] cat-file: create p1006-cat-file.sh ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 13/17] [GSOC] cat-file: reuse ref-filter logic ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 14/17] [GSOC] cat-file: reuse err buf in batch_object_write() ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 15/17] [GSOC] cat-file: re-implement --textconv, --filters options ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 16/17] [GSOC] ref-filter: remove grab_oid() function ZheNing Hu via GitGitGadget
2021-07-15 15:40   ` [PATCH v2 17/17] [GSOC] cat-file: use fast path when using default_format ZheNing Hu via GitGitGadget

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