From: Jonathan Nieder <jrnieder@gmail.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: git@vger.kernel.org, "Junio C Hamano" <gitster@pobox.com>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
"Jeff King" <peff@peff.net>,
"Michael Haggerty" <mhagger@alum.mit.edu>,
"Stefan Beller" <stefanbeller@gmail.com>,
"Matt McCutchen" <matt@mattmccutchen.net>
Subject: Re: [PATCH 4/4] gc docs: downplay the usefulness of --aggressive
Date: Mon, 18 Mar 2019 13:28:24 -0700 [thread overview]
Message-ID: <20190318202824.GA24222@gmail.com> (raw)
In-Reply-To: <20190318161502.7979-5-avarab@gmail.com>
Hi,
Ævar Arnfjörð Bjarmason wrote:
> --- a/Documentation/git-gc.txt
> +++ b/Documentation/git-gc.txt
> @@ -41,10 +41,20 @@ OPTIONS
> --aggressive::
> Usually 'git gc' runs very quickly while providing good disk
> space utilization and performance. This option will cause
> - 'git gc' to more aggressively optimize the repository at the expense
> - of taking much more time. The effects of this optimization are
> - persistent, so this option only needs to be used occasionally; every
> - few hundred changesets or so.
> + 'git gc' to more aggressively optimize the repository to save storage space
> + at the expense of taking much more time.
This part looks good.
> ++
> +Using this option may optimize for disk space at the expense of
> +runtime performance. See the `--depth` and `--window` documentation in
> +linkgit:git-repack[1]. It is not recommended that this option be used
> +to improve performance for a given repository without running tailored
> +performance benchmarks on it. It may make things better, or worse. Not
> +using this at all is the right trade-off for most users and their
> +repositories.
This part kind of feels like giving up. Can we make --aggressive have
good runtime read performance so we don't have to hedge this way?
E.g. is this patch papering over a poor choice of --depth setting in
--aggressive?
> ++
> +The effects of this option are persistent to the extent that
> +`gc.autoPackLimit` and friends don't cause a consolidation of existing
> +pack(s) generated with this option.
Thanks and hope that helps,
Jonathan
next prev parent reply other threads:[~2019-03-18 20:28 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-18 16:14 [PATCH 0/4] gc docs: modernize and fix the documentation Ævar Arnfjörð Bjarmason
2019-03-18 16:14 ` [PATCH 1/4] gc docs: modernize the advice for manually running "gc" Ævar Arnfjörð Bjarmason
2019-03-18 21:27 ` Jeff King
2019-03-18 22:18 ` Ævar Arnfjörð Bjarmason
2019-03-18 16:15 ` [PATCH 2/4] gc docs: include the "gc.*" section from "config" in "gc" Ævar Arnfjörð Bjarmason
2019-03-18 21:31 ` Jeff King
2019-03-21 22:11 ` Andreas Heiduk
2019-03-19 2:08 ` Duy Nguyen
2019-03-18 16:15 ` [PATCH 3/4] gc docs: de-duplicate "OPTIONS" and "CONFIGURATION" Ævar Arnfjörð Bjarmason
2019-03-18 21:49 ` Jeff King
2019-03-18 22:48 ` Ævar Arnfjörð Bjarmason
2019-03-18 23:42 ` Jeff King
2019-03-18 16:15 ` [PATCH 4/4] gc docs: downplay the usefulness of --aggressive Ævar Arnfjörð Bjarmason
2019-03-18 20:28 ` Jonathan Nieder [this message]
2019-03-18 21:22 ` Jeff King
2019-03-18 22:13 ` Ævar Arnfjörð Bjarmason
2019-03-18 23:53 ` Jeff King
2019-03-19 6:54 ` Johannes Sixt
2019-03-19 9:28 ` Ævar Arnfjörð Bjarmason
2019-03-18 21:51 ` [PATCH 0/4] gc docs: modernize and fix the documentation Jeff King
2019-03-18 22:45 ` Ævar Arnfjörð Bjarmason
2019-03-19 0:18 ` Jeff King
2019-05-06 9:44 ` Ævar Arnfjörð Bjarmason
2019-05-07 7:51 ` Jeff King
2019-05-09 23:20 ` Ævar Arnfjörð Bjarmason
2019-07-31 4:26 ` Jeff King
2019-07-31 10:12 ` Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 00/10] " Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 00/11] gc docs: modernize the advice for manually running "gc" Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 01/11] " Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 02/11] gc docs: stop noting "repack" flags Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 03/11] gc docs: clean grammar for "gc.bigPackThreshold" Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 04/11] gc docs: include the "gc.*" section from "config" in "gc" Ævar Arnfjörð Bjarmason
2019-03-30 18:04 ` Todd Zullinger
2019-04-07 19:52 ` [PATCH v4 00/11] gc docs: modernize and fix the documentation Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 01/11] gc docs: modernize the advice for manually running "gc" Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 02/11] gc docs: stop noting "repack" flags Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 03/11] gc docs: clean grammar for "gc.bigPackThreshold" Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 04/11] gc docs: include the "gc.*" section from "config" in "gc" Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 05/11] gc docs: re-flow the "gc.*" section in "config" Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 06/11] gc docs: fix formatting for "gc.writeCommitGraph" Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 07/11] gc docs: note how --aggressive impacts --window & --depth Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 08/11] gc docs: downplay the usefulness of --aggressive Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 09/11] gc docs: note "gc --aggressive" in "fast-import" Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 10/11] gc docs: clarify that "gc" doesn't throw away referenced objects Ævar Arnfjörð Bjarmason
2019-04-07 19:52 ` [PATCH v4 11/11] gc docs: remove incorrect reference to gc.auto=0 Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 05/11] gc docs: re-flow the "gc.*" section in "config" Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 06/11] gc docs: fix formatting for "gc.writeCommitGraph" Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 07/11] gc docs: note how --aggressive impacts --window & --depth Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 08/11] gc docs: downplay the usefulness of --aggressive Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 09/11] gc docs: note "gc --aggressive" in "fast-import" Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 10/11] gc docs: clarify that "gc" doesn't throw away referenced objects Ævar Arnfjörð Bjarmason
2019-03-22 9:32 ` [PATCH v3 11/11] gc docs: remove incorrect reference to gc.auto=0 Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 01/10] gc docs: modernize the advice for manually running "gc" Ævar Arnfjörð Bjarmason
2019-03-22 6:01 ` Junio C Hamano
2019-03-21 20:50 ` [PATCH v2 02/10] gc docs: stop noting "repack" flags Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 03/10] gc docs: clean grammar for "gc.bigPackThreshold" Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 04/10] gc docs: include the "gc.*" section from "config" in "gc" Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 05/10] gc docs: re-flow the "gc.*" section in "config" Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 06/10] gc docs: note how --aggressive impacts --window & --depth Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 07/10] gc docs: downplay the usefulness of --aggressive Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 08/10] gc docs: note "gc --aggressive" in "fast-import" Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 09/10] gc docs: clarify that "gc" doesn't throw away referenced objects Ævar Arnfjörð Bjarmason
2019-03-21 20:50 ` [PATCH v2 10/10] gc docs: remove incorrect reference to gc.auto=0 Ævar Arnfjörð Bjarmason
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