From: Junio C Hamano <gitster@pobox.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Calvin Wan <calvinwan@google.com>,
git@vger.kernel.org, emilyshaffer@google.com
Subject: Re: [PATCH 4/4] diff-lib: parallelize run_diff_files for submodules
Date: Sat, 24 Sep 2022 13:17:02 -0700 [thread overview]
Message-ID: <xmqqsfkgr0ht.fsf@gitster.g> (raw)
In-Reply-To: <220923.86o7v64ik0.gmgdl@evledraar.gmail.com> ("Ævar Arnfjörð Bjarmason"'s message of "Fri, 23 Sep 2022 10:06:56 +0200")
Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
> On Thu, Sep 22 2022, Calvin Wan wrote:
>
>> +status.parallelSubmodules::
>> + When linkgit:git-status[1] is run in a superproject with
>> + submodules, a status subprocess is spawned for every submodule.
>> + This option specifies the number of submodule status subprocesses
>> + to run in parallel. If unset, it defaults to 1.
>
> Why do we default to 1, instead of e.g. grep.threads defaulting to the
> "cores available"?
I would imagine we would want to be able to say:
- I do not trust the parallel mode yet, just use the single process
method that we have always been using.
- I do not know how many cores I have, just use a reasonable
default parallelism.
- I want to use N processes because I know better than auto-scaling
based on num_cpus.
And the value of 1 would be a reasonable way to express the first
one.
next prev parent reply other threads:[~2022-09-24 20:17 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 23:29 [PATCH 0/4] submodule: parallelize status Calvin Wan
2022-09-22 23:29 ` [PATCH 1/4] run-command: add pipe_output to run_processes_parallel Calvin Wan
2022-09-23 7:52 ` Ævar Arnfjörð Bjarmason
2022-09-26 16:59 ` Calvin Wan
2022-09-27 10:52 ` Ævar Arnfjörð Bjarmason
2022-09-23 18:58 ` Junio C Hamano
2022-09-26 17:31 ` Calvin Wan
2022-09-27 4:45 ` Junio C Hamano
2022-09-27 18:10 ` Calvin Wan
2022-09-27 21:40 ` Junio C Hamano
2022-09-27 9:05 ` Ævar Arnfjörð Bjarmason
2022-09-27 17:55 ` Calvin Wan
2022-09-27 19:34 ` Ævar Arnfjörð Bjarmason
2022-09-27 20:45 ` Calvin Wan
2022-09-28 5:40 ` Ævar Arnfjörð Bjarmason
2022-09-29 20:52 ` Calvin Wan
2022-09-22 23:29 ` [PATCH 2/4] submodule: move status parsing into function Calvin Wan
2022-09-22 23:29 ` [PATCH 3/4] diff-lib: refactor functions Calvin Wan
2022-09-23 20:36 ` Junio C Hamano
2022-09-26 17:35 ` Calvin Wan
2022-09-22 23:29 ` [PATCH 4/4] diff-lib: parallelize run_diff_files for submodules Calvin Wan
2022-09-23 8:06 ` Ævar Arnfjörð Bjarmason
2022-09-24 20:17 ` Junio C Hamano [this message]
2022-09-26 17:50 ` Calvin Wan
2022-09-23 21:44 ` Junio C Hamano
2022-09-26 19:12 ` Calvin Wan
2022-09-25 13:59 ` Phillip Wood
2022-09-26 17:11 ` Junio C Hamano
2022-09-26 19:22 ` Calvin Wan
2022-09-27 18:40 ` Emily Shaffer
2022-09-23 22:56 ` [PATCH 0/4] submodule: parallelize status Junio C Hamano
2022-09-26 16:33 ` Calvin Wan
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