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From: Taylor Blau <me@ttaylorr.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Jeff King <peff@peff.net>,
	git@vger.kernel.org, Kyle Meyer <kyle@kyleam.com>,
	Eric Sunshine <sunshine@sunshineco.com>
Subject: Re: [PATCH v2] rev-list --disk-usage
Date: Tue, 9 Feb 2021 20:49:43 -0500	[thread overview]
Message-ID: <YCM7t3buBR6sL/lh@nand.local> (raw)
In-Reply-To: <xmqqh7mkycno.fsf@gitster.c.googlers.com>

On Tue, Feb 09, 2021 at 04:44:27PM -0800, Junio C Hamano wrote:
> Jeff King <peff@peff.net> writes:
>
> > Here's a re-roll of my series to add "rev-list --disk-usage", for
> > counting up object storage used for various slices of history.
> > ...
> >  t/t6114-rev-list-du.sh             | 51 +++++++++++++++++++
> >  t/test-lib-functions.sh            |  9 +++-
> >  7 files changed, 199 insertions(+), 8 deletions(-)
> >  create mode 100755 t/t6114-rev-list-du.sh
>
> I relocated 6114 to 6115 to avoid tests sharing the same number.

Thanks.

> I am getting these numbers from random ranges I am interested in,
> but do they say what I think they mean?  Was the development effort
> went into the v2.28 release almost half the size of v2.29, and have
> we already done about the same amont of work for this cycle?
>
> : gitster git.git/seen; rungit seen rev-list --disk-usage master..next
> 83105
> : gitster git.git/seen; rungit seen rev-list --disk-usage v2.30.0..master
> 183463
> : gitster git.git/seen; rungit seen rev-list --disk-usage v2.29.0..v2.30.0
> 231640
> : gitster git.git/seen; rungit seen rev-list --disk-usage v2.28.0..v2.29.0
> 334355
> : gitster git.git/seen; rungit seen rev-list --disk-usage v2.27.0..v2.28.0
> 182298

I think you are surprised by these numbers because you're only counting
disk usage of commit objects in those ranges. v1 of this series implied
--objects by default, but this changed in v2 due to my suggestion.

Passing --objects to count the disk-usage of all objects in those ranges
gives more reasonable numbers (and match my rough guesses, i.e., that
2.29 was busier than 2.30, and so on):

    $ for range in origin/master..origin/next v2.30.0..origin/master \
        v2.29.0..v2.30.0 v2.28.0..v2.29.0 v2.27.0..v2.28.0
    do
      printf "%s %d vs. %d\n" $range \
        "$(git rev-list --objects --no-object-names $range |
           git cat-file --batch-check='%(objectsize:disk)' |
           paste -sd+ | bc)" \
        "$(git.seen rev-list --objects --disk-usage $range)"
    done
    origin/master..origin/next 671380 vs. 671380
    v2.30.0..origin/master 1618815 vs. 1618815
    v2.29.0..v2.30.0 3308295 vs. 3308295
    v2.28.0..v2.29.0 4080789 vs. 4080789
    v2.27.0..v2.28.0 2846196 vs. 2846196

Thanks,
Taylor

  reply	other threads:[~2021-02-10  1:52 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-27 22:11 [PATCH 0/2] " Jeff King
2021-01-27 22:12 ` [PATCH 1/2] t: add --no-tag option to test_commit Jeff King
2021-01-27 22:48   ` Taylor Blau
2021-01-27 22:17 ` [PATCH 2/2] rev-list: add --disk-usage option for calculating disk usage Jeff King
2021-01-27 22:57   ` Taylor Blau
2021-01-27 23:34     ` Jeff King
2021-01-27 23:01   ` Kyle Meyer
2021-01-27 23:36     ` Jeff King
2021-01-27 23:07   ` Eric Sunshine
2021-01-27 23:39     ` Jeff King
2021-01-27 22:46 ` [PATCH 0/2] rev-list --disk-usage Taylor Blau
2021-02-09 10:52 ` [PATCH v2] " Jeff King
2021-02-09 10:52   ` [PATCH v2 1/2] t: add --no-tag option to test_commit Jeff King
2021-02-09 10:53   ` [PATCH v2 2/2] rev-list: add --disk-usage option for calculating disk usage Jeff King
2021-02-09 11:09   ` [PATCH v2] rev-list --disk-usage Jeff King
2021-02-09 21:14     ` Junio C Hamano
2021-02-10  9:38       ` Jeff King
2021-02-10  0:44   ` Junio C Hamano
2021-02-10  1:49     ` Taylor Blau [this message]
2021-02-10 10:01     ` Jeff King
2021-02-10 16:31       ` Junio C Hamano
2021-02-10 20:38         ` Jeff King
2021-02-10 23:15           ` Taylor Blau
2021-02-11 11:00             ` Jeff King
2021-02-11 12:04               ` Ævar Arnfjörð Bjarmason
2021-02-11 17:57                 ` Junio C Hamano
2021-02-17 23:31                 ` [PATCH 0/2] rev-list --disk-usage example docs Jeff King
2021-02-17 23:34                   ` [PATCH 1/2] docs/rev-list: add an examples section Jeff King
2021-02-17 23:35                   ` [PATCH 2/2] docs/rev-list: add some examples of --disk-usage Jeff King
2021-02-17 23:44                   ` [PATCH 0/2] rev-list --disk-usage example docs Taylor Blau

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