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From: Duy Nguyen <pclouds@gmail.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>,
	Junio C Hamano <gitster@pobox.com>, Jeff King <peff@peff.net>,
	Michael Haggerty <mhagger@alum.mit.edu>
Subject: Re: [RFC/PATCH] gc: run more pre-detach operations under lock
Date: Wed, 19 Jun 2019 19:51:00 +0700
Message-ID: <CACsJy8AqA3TmNP62ko4c5Et39jsADYf9nKQByz28y-YQjNyKag@mail.gmail.com> (raw)
In-Reply-To: <20190619102601.24913-1-avarab@gmail.com>

On Wed, Jun 19, 2019 at 5:26 PM Ævar Arnfjörð Bjarmason
<avarab@gmail.com> wrote:
> This patch is part of a WIP branch I have that's a bit of a mess. It's
> more-gc-detach-under-lock on github.com/avar/git.git. It doesn't apply
> on master because it relies on some previous test work, but for RFC
> purposes I figured it was better to send it stand-alone.
>
> But I think this sort of approach is better than Duy's proposed patch,
> because...
>
> On Wed, Jun 19 2019, Nguyễn Thái Ngọc Duy wrote:
>
> > So let's try to avoid that. We should only need one 'gc' run after all
> > objects and references are added anyway. Add a new option --no-auto-gc
> > that will be used by those n-1 processes. 'gc --auto' will always run on
> > the main fetch process (*).
> >
> > (*) even if we fetch remotes in parallel at some point in future, this
> >     should still be fine because we should "join" all those processes
> >     before this step.
>
> This is what I'm trying to fix in my version of this patch. This is
> only true for yours if you assume that the user is going to be
> invoking "fetch" in a single terminal window, IOW that we have an
> implicit global mutex of one top-level git command at a time.
>
> Wheras mine fixes e.g. the same issue for:
>
>     parallel 'git fetch {}' ::: $(git remote)
>
> Ditto for you running a "git" command and your editor running a
> "fetch" at the same time.

You could sort of avoid the problem here too with

parallel 'git fetch --no-auto-gc {}' ::: $(git remote)
git gc --auto

It's definitely simpler, but of course we have to manually add
--no-auto-gc in everywhere we need, so not quite as elegant.

Actually you could already do that with 'git -c gc.auto=false fetch', I guess.
-- 
Duy

  reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-19  9:46 [PATCH] fetch: only run 'gc' once when fetching multiple remotes Nguyễn Thái Ngọc Duy
2019-06-19 10:26 ` [RFC/PATCH] gc: run more pre-detach operations under lock Ævar Arnfjörð Bjarmason
2019-06-19 12:51   ` Duy Nguyen [this message]
2019-06-19 18:01     ` Ævar Arnfjörð Bjarmason
2019-06-19 19:10       ` Jeff King
2019-06-19 22:49         ` Ævar Arnfjörð Bjarmason
2019-06-19 23:30           ` [PATCH 0/6] Change <non-empty?> GIT_TEST_* variables to <boolean> Ævar Arnfjörð Bjarmason
2019-06-20 18:13             ` Junio C Hamano
2019-06-20 21:00               ` Ævar Arnfjörð Bjarmason
2019-06-20 20:03             ` Junio C Hamano
2019-06-20 21:09             ` [PATCH v2 0/8] " Ævar Arnfjörð Bjarmason
2019-06-21 10:18               ` [PATCH v3 " Ævar Arnfjörð Bjarmason
2019-06-21 10:18               ` [PATCH v3 1/8] config tests: simplify include cycle test Ævar Arnfjörð Bjarmason
2019-06-21 10:18               ` [PATCH v3 2/8] env--helper: new undocumented builtin wrapping git_env_*() Ævar Arnfjörð Bjarmason
2019-06-21 17:07                 ` Junio C Hamano
2019-06-21 10:18               ` [PATCH v3 3/8] config.c: refactor die_bad_number() to not call gettext() early Ævar Arnfjörð Bjarmason
2019-06-21 10:18               ` [PATCH v3 4/8] t6040 test: stop using global "script" variable Ævar Arnfjörð Bjarmason
2019-06-21 10:18               ` [PATCH v3 5/8] tests: make GIT_TEST_GETTEXT_POISON a boolean Ævar Arnfjörð Bjarmason
2019-06-24 16:47                 ` Junio C Hamano
2019-06-21 10:18               ` [PATCH v3 6/8] tests README: re-flow a previously changed paragraph Ævar Arnfjörð Bjarmason
2019-06-21 10:18               ` [PATCH v3 7/8] tests: replace test_tristate with "git env--helper" Ævar Arnfjörð Bjarmason
2019-09-06 12:13                 ` [PATCH 1/2] t/lib-git-svn.sh: check GIT_TEST_SVN_HTTPD when running SVN HTTP tests SZEDER Gábor
2019-09-06 12:13                   ` [PATCH 2/2] ci: restore running httpd tests SZEDER Gábor
2019-09-06 17:03                     ` Junio C Hamano
2019-09-06 19:13                     ` Jeff King
2019-09-07 10:16                       ` SZEDER Gábor
2019-11-22 13:14                         ` [PATCH 0/2] tests: catch non-bool GIT_TEST_* values SZEDER Gábor
2019-11-22 13:14                           ` [PATCH 1/2] tests: add 'test_bool_env' to " SZEDER Gábor
2019-11-25 13:50                             ` Jeff King
2019-11-22 13:14                           ` [PATCH 2/2] t5608-clone-2gb.sh: turn GIT_TEST_CLONE_2GB into a bool SZEDER Gábor
2019-11-25 13:53                             ` Jeff King
2019-06-21 10:18               ` [PATCH v3 8/8] tests: make GIT_TEST_FAIL_PREREQS a boolean Ævar Arnfjörð Bjarmason
2019-06-20 21:09             ` [PATCH v2 1/8] config tests: simplify include cycle test Ævar Arnfjörð Bjarmason
2019-06-20 21:09             ` [PATCH v2 2/8] env--helper: new undocumented builtin wrapping git_env_*() Ævar Arnfjörð Bjarmason
2019-06-20 22:11               ` Junio C Hamano
2019-06-20 22:21                 ` Junio C Hamano
2019-06-21  8:11                   ` Ævar Arnfjörð Bjarmason
2019-06-21 15:04                     ` Junio C Hamano
2019-06-20 21:09             ` [PATCH v2 3/8] config.c: refactor die_bad_number() to not call gettext() early Ævar Arnfjörð Bjarmason
2019-06-20 21:09             ` [PATCH v2 4/8] t6040 test: stop using global "script" variable Ævar Arnfjörð Bjarmason
2019-06-20 21:09             ` [PATCH v2 5/8] tests: make GIT_TEST_GETTEXT_POISON a boolean Ævar Arnfjörð Bjarmason
2019-06-20 21:09             ` [PATCH v2 6/8] tests README: re-flow a previously changed paragraph Ævar Arnfjörð Bjarmason
2019-06-20 21:09             ` [PATCH v2 7/8] tests: replace test_tristate with "git env--helper" Ævar Arnfjörð Bjarmason
2019-06-20 21:09             ` [PATCH v2 8/8] tests: make GIT_TEST_FAIL_PREREQS a boolean Ævar Arnfjörð Bjarmason
2019-06-19 23:30           ` [PATCH 1/6] env--helper: new undocumented builtin wrapping git_env_*() Ævar Arnfjörð Bjarmason
2019-06-20 19:25             ` Junio C Hamano
2019-06-19 23:30           ` [PATCH 2/6] t6040 test: stop using global "script" variable Ævar Arnfjörð Bjarmason
2019-06-20 19:54             ` Junio C Hamano
2019-06-19 23:30           ` [PATCH 3/6] tests: make GIT_TEST_GETTEXT_POISON a boolean Ævar Arnfjörð Bjarmason
2019-06-20 20:00             ` Junio C Hamano
2019-06-19 23:30           ` [PATCH 4/6] tests README: re-flow a previously changed paragraph Ævar Arnfjörð Bjarmason
2019-06-19 23:30           ` [PATCH 5/6] tests: replace test_tristate with "git env--helper" Ævar Arnfjörð Bjarmason
2019-06-19 23:30           ` [PATCH 6/6] tests: make GIT_TEST_FAIL_PREREQS a boolean Ævar Arnfjörð Bjarmason
2019-06-20 10:26           ` [RFC/PATCH] gc: run more pre-detach operations under lock Duy Nguyen
2019-06-20 21:49             ` Ævar Arnfjörð Bjarmason
2019-06-20 10:43           ` Jeff King
2019-06-20 18:55         ` Junio C Hamano
2019-06-19 19:08     ` Jeff King
2019-06-19 18:59 ` [PATCH] fetch: only run 'gc' once when fetching multiple remotes Jeff King
2019-06-20 10:11   ` Duy Nguyen
2019-06-20 10:21     ` Jeff King

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