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From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: Elijah Newren <newren@gmail.com>
Cc: Matthew John Cheetham via GitGitGadget <gitgitgadget@gmail.com>,
	Git Mailing List <git@vger.kernel.org>,
	Matthew John Cheetham <mjcheetham@outlook.com>
Subject: Re: [PATCH 4/5] scalar: teach `diagnose` to gather loose objects information
Date: Sun, 6 Feb 2022 22:25:33 +0100 (CET)	[thread overview]
Message-ID: <nycvar.QRO.7.76.6.2202062214110.347@tvgsbejvaqbjf.bet> (raw)
In-Reply-To: <CABPp-BHeLzinXkX3WgqBNYntJwY_ZAm5D7VdOR7KQahvLOuV=w@mail.gmail.com>

Hi Elijah,

On Thu, 27 Jan 2022, Elijah Newren wrote:

> On Wed, Jan 26, 2022 at 3:37 PM Matthew John Cheetham via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
> >
> > From: Matthew John Cheetham <mjcheetham@outlook.com>
> >
> > When operating at the scale that Scalar wants to support, certain data
> > shapes are more likely to cause undesirable performance issues, such as
> > large numbers or large sizes of loose objects.
>
> Makes sense.
>
> > By including statistics about this, `scalar diagnose` now makes it
> > easier to identify such scenarios.
> >
> > Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>
> > ---
> >  contrib/scalar/scalar.c          | 60 ++++++++++++++++++++++++++++++++
> >  contrib/scalar/t/t9099-scalar.sh |  2 ++
> >  2 files changed, 62 insertions(+)
> >
> > diff --git a/contrib/scalar/scalar.c b/contrib/scalar/scalar.c
> > index 690933ffdf3..c0ad4948215 100644
> > --- a/contrib/scalar/scalar.c
> > +++ b/contrib/scalar/scalar.c
> > @@ -686,6 +686,60 @@ static void dir_file_stats(struct strbuf *buf, const char *path)
> >         closedir(dir);
> >  }
> >
> > +static int count_files(char *path)
> > +{
> > +       DIR *dir = opendir(path);
> > +       struct dirent *e;
> > +       int count = 0;
> > +
> > +       if (!dir)
> > +               return 0;
> > +
> > +       while ((e = readdir(dir)) != NULL)
> > +               if (!is_dot_or_dotdot(e->d_name) && e->d_type == DT_REG)
> > +                       count++;
> > +
> > +       closedir(dir);
> > +       return count;
> > +}
> > +
> > +static void loose_objs_stats(struct strbuf *buf, const char *path)
> > +{
> > +       DIR *dir = opendir(path);
> > +       struct dirent *e;
> > +       int count;
> > +       int total = 0;
> > +       unsigned char c;
> > +       struct strbuf count_path = STRBUF_INIT;
> > +       size_t base_path_len;
> > +
> > +       if (!dir)
> > +               return;
> > +
> > +       strbuf_addstr(buf, "Object directory stats for ");
> > +       strbuf_add_absolute_path(buf, path);
> > +       strbuf_addstr(buf, ":\n");
> > +
> > +       strbuf_add_absolute_path(&count_path, path);
> > +       strbuf_addch(&count_path, '/');
> > +       base_path_len = count_path.len;
> > +
> > +       while ((e = readdir(dir)) != NULL)
> > +               if (!is_dot_or_dotdot(e->d_name) &&
> > +                   e->d_type == DT_DIR && strlen(e->d_name) == 2 &&
> > +                   !hex_to_bytes(&c, e->d_name, 1)) {
>
> You only recurse into directories, ignoring individual files.
>
> > +                       strbuf_setlen(&count_path, base_path_len);
> > +                       strbuf_addstr(&count_path, e->d_name);
> > +                       total += (count = count_files(count_path.buf));
> > +                       strbuf_addf(buf, "%s : %7d files\n", e->d_name, count);
>
> This shows the number of files within a directory.
>
> > +               }
> > +
> > +       strbuf_addf(buf, "Total: %d loose objects", total);
>
> and this shows the total number of files across all the directories.
>
> But the commit message suggested you also wanted to check for large
> sizes of loose objects.  Did that get ripped out at some point with
> the commit message not being updated, or is it perhaps going to be
> included later?

No, there was no plan to include this information later, as the original
.NET implementation of `scalar diagnose` did not provide that information,
either (which I take as a strong sign that we never needed this type of
information to help users, at least not up until this point).

Besides, it would be kind of a difficult thing to say conclusively what
makes a loose file "big". Is it the zlib-compressed size on disk? Or the
unpacked size? Should there be a configurable threshold to determine when
an object is big? Should `core.bigFileThreshold` be co-opted for this?

Together with the fact that there was no need for this information in
practice, it makes me doubt that we should add this type of information. I
actually suspect that _iff_ information of that type would be helpful, a
more complete tool like git-sizer (https://github.com/github/git-sizer/)
would be needed, and I do not really want to subsume git-sizer's
functionality in `scalar diagnose`.

I rephrased the commit message.

Ciao,
Dscho

>
> > +
> > +       strbuf_release(&count_path);
> > +       closedir(dir);
> > +}
> > +
> >  static int cmd_diagnose(int argc, const char **argv)
> >  {
> >         struct option options[] = {
> > @@ -734,6 +788,12 @@ static int cmd_diagnose(int argc, const char **argv)
> >         if ((res = stage(tmp_dir.buf, &buf, "packs-local.txt")))
> >                 goto diagnose_cleanup;
> >
> > +       strbuf_reset(&buf);
> > +       loose_objs_stats(&buf, ".git/objects");
> > +
> > +       if ((res = stage(tmp_dir.buf, &buf, "objects-local.txt")))
> > +               goto diagnose_cleanup;
> > +
> >         if ((res = stage_directory(tmp_dir.buf, ".git", 0)) ||
> >             (res = stage_directory(tmp_dir.buf, ".git/hooks", 0)) ||
> >             (res = stage_directory(tmp_dir.buf, ".git/info", 0)) ||
> > diff --git a/contrib/scalar/t/t9099-scalar.sh b/contrib/scalar/t/t9099-scalar.sh
> > index b1745851e31..f2ec156d819 100755
> > --- a/contrib/scalar/t/t9099-scalar.sh
> > +++ b/contrib/scalar/t/t9099-scalar.sh
> > @@ -77,6 +77,8 @@ test_expect_success UNZIP 'scalar diagnose' '
> >         unzip -p "$zip_path" diagnostics.log >out &&
> >         test_file_not_empty out &&
> >         unzip -p "$zip_path" packs-local.txt >out &&
> > +       test_file_not_empty out &&
> > +       unzip -p "$zip_path" objects-local.txt >out &&
> >         test_file_not_empty out
> >  '
> >
> > --
> > gitgitgadget
>

  reply	other threads:[~2022-02-06 21:25 UTC|newest]

Thread overview: 140+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-26  8:41 [PATCH 0/5] scalar: implement the subcommand "diagnose" Johannes Schindelin via GitGitGadget
2022-01-26  8:41 ` [PATCH 1/5] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-01-26  9:34   ` René Scharfe
2022-01-26 22:20     ` Taylor Blau
2022-02-06 21:34       ` Johannes Schindelin
2022-01-27 19:38   ` Elijah Newren
2022-01-26  8:41 ` [PATCH 2/5] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-01-26  8:41 ` [PATCH 3/5] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-01-26 22:43   ` Taylor Blau
2022-01-27 15:14     ` Derrick Stolee
2022-02-06 21:38       ` Johannes Schindelin
2022-01-26  8:41 ` [PATCH 4/5] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-01-26 22:50   ` Taylor Blau
2022-01-27 15:17     ` Derrick Stolee
2022-01-27 18:59   ` Elijah Newren
2022-02-06 21:25     ` Johannes Schindelin [this message]
2022-01-26  8:41 ` [PATCH 5/5] scalar diagnose: show a spinner while staging content Johannes Schindelin via GitGitGadget
2022-01-27 15:19 ` [PATCH 0/5] scalar: implement the subcommand "diagnose" Derrick Stolee
2022-02-06 21:13   ` Johannes Schindelin
2022-02-06 22:39 ` [PATCH v2 0/6] " Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 1/6] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-02-07 19:55     ` René Scharfe
2022-02-07 23:30       ` Junio C Hamano
2022-02-08 13:12         ` Johannes Schindelin
2022-02-08 17:44           ` Junio C Hamano
2022-02-08 20:58             ` René Scharfe
2022-02-09 22:48               ` Junio C Hamano
2022-02-10 19:10                 ` René Scharfe
2022-02-10 19:23                   ` Junio C Hamano
2022-02-11 19:16                     ` René Scharfe
2022-02-11 21:27                       ` Junio C Hamano
2022-02-12  9:12                         ` René Scharfe
2022-02-13  6:25                           ` Junio C Hamano
2022-02-13  9:02                             ` René Scharfe
2022-02-14 17:22                               ` Junio C Hamano
2022-02-08 12:54       ` Johannes Schindelin
2022-02-06 22:39   ` [PATCH v2 2/6] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 3/6] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-02-07 19:55     ` René Scharfe
2022-02-08 12:08       ` Johannes Schindelin
2022-02-06 22:39   ` [PATCH v2 4/6] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 5/6] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 6/6] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-04 15:25   ` [PATCH v3 0/7] scalar: implement the subcommand "diagnose" Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-07  2:06       ` Elijah Newren
2022-05-09 21:04         ` Johannes Schindelin
2022-05-04 15:25     ` [PATCH v3 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-07  2:23     ` [PATCH v3 0/7] scalar: implement the subcommand "diagnose" Elijah Newren
2022-05-10 19:26     ` [PATCH v4 " Johannes Schindelin via GitGitGadget
2022-05-10 19:26       ` [PATCH v4 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-10 21:48         ` Junio C Hamano
2022-05-10 22:06           ` rsbecker
2022-05-10 23:21             ` Junio C Hamano
2022-05-11 16:14               ` René Scharfe
2022-05-11 19:27                 ` Junio C Hamano
2022-05-12 16:16                   ` René Scharfe
2022-05-12 18:15                     ` Junio C Hamano
2022-05-12 21:31                       ` Junio C Hamano
2022-05-14  7:06                         ` René Scharfe
2022-05-12 22:31           ` [PATCH] fixup! " Junio C Hamano
2022-05-10 19:26       ` [PATCH v4 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-10 21:56         ` Junio C Hamano
2022-05-10 22:23           ` rsbecker
2022-05-19 18:12             ` Johannes Schindelin
2022-05-19 18:09           ` Johannes Schindelin
2022-05-19 18:44             ` Junio C Hamano
2022-05-10 19:27       ` [PATCH v4 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-17 14:51         ` Ævar Arnfjörð Bjarmason
2022-05-18 17:35           ` Junio C Hamano
2022-05-20  7:30             ` Ævar Arnfjörð Bjarmason
2022-05-20 15:55               ` Johannes Schindelin
2022-05-21  9:54                 ` Ævar Arnfjörð Bjarmason
2022-05-22  5:50                   ` Junio C Hamano
2022-05-24 12:25                     ` Johannes Schindelin
2022-05-24 18:11                       ` Ævar Arnfjörð Bjarmason
2022-05-24 19:29                         ` Junio C Hamano
2022-05-25 10:31                           ` Johannes Schindelin
2022-05-10 19:27       ` [PATCH v4 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-17 14:53         ` Ævar Arnfjörð Bjarmason
2022-05-10 19:27       ` [PATCH v4 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-10 19:27       ` [PATCH v4 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-10 19:27       ` [PATCH v4 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-17 15:03       ` [PATCH v4 0/7] scalar: implement the subcommand "diagnose" Ævar Arnfjörð Bjarmason
2022-05-17 15:28         ` rsbecker
2022-05-19 18:17           ` Johannes Schindelin
2022-05-19 18:17       ` [PATCH v5 " Johannes Schindelin via GitGitGadget
2022-05-19 18:17         ` [PATCH v5 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-20 14:41           ` René Scharfe
2022-05-20 16:21             ` Junio C Hamano
2022-05-19 18:17         ` [PATCH v5 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-19 18:17         ` [PATCH v5 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-19 19:23         ` [PATCH v5 0/7] scalar: implement the subcommand "diagnose" Junio C Hamano
2022-05-21 15:08         ` [PATCH v6 " Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-25 21:11             ` Junio C Hamano
2022-05-26  9:09               ` René Scharfe
2022-05-26 17:10                 ` Junio C Hamano
2022-05-26 18:57                   ` René Scharfe
2022-05-26 20:16                     ` Junio C Hamano
2022-05-27 17:02                       ` René Scharfe
2022-05-27 19:01                         ` Junio C Hamano
2022-05-28  6:57                           ` René Scharfe
2022-05-21 15:08           ` [PATCH v6 2/7] archive --add-virtual-file: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-25 20:22             ` Junio C Hamano
2022-05-25 21:42               ` Junio C Hamano
2022-05-25 22:34                 ` Junio C Hamano
2022-05-21 15:08           ` [PATCH v6 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-28 23:11           ` [PATCH v6+ 0/7] js/scalar-diagnose rebased Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 1/7] archive: optionally add "virtual" files Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 2/7] archive --add-virtual-file: allow paths containing colons Junio C Hamano
2022-06-15 18:16               ` Adam Dinwoodie
2022-06-15 20:00                 ` Junio C Hamano
2022-06-15 21:36                   ` Adam Dinwoodie
2022-06-18 20:19                     ` Johannes Schindelin
2022-06-18 22:05                       ` Junio C Hamano
2022-06-20  9:41                       ` Adam Dinwoodie
2022-05-28 23:11             ` [PATCH v6+ 3/7] scalar: validate the optional enlistment argument Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 4/7] scalar: implement `scalar diagnose` Junio C Hamano
2022-06-10  2:08               ` Ævar Arnfjörð Bjarmason
2022-06-10 16:44                 ` Junio C Hamano
2022-06-10 17:35                   ` Ævar Arnfjörð Bjarmason
2022-05-28 23:11             ` [PATCH v6+ 5/7] scalar diagnose: include disk space information Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 6/7] scalar: teach `diagnose` to gather packfile info Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 7/7] scalar: teach `diagnose` to gather loose objects information Junio C Hamano
2022-05-30 10:12             ` [PATCH v6+ 0/7] js/scalar-diagnose rebased Johannes Schindelin
2022-05-30 17:37               ` Junio C Hamano

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