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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: "SZEDER Gábor" <szeder.dev@gmail.com>
Cc: git@vger.kernel.org, "Junio C Hamano" <gitster@pobox.com>,
	"Derrick Stolee" <stolee@gmail.com>, "Jeff King" <peff@peff.net>,
	"Eric Sunshine" <sunshine@sunshineco.com>,
	"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>
Subject: Re: [PATCH v3 1/2] commit-graph write: add progress output
Date: Thu, 11 Oct 2018 19:52:21 +0200	[thread overview]
Message-ID: <87a7nke5gq.fsf@evledraar.gmail.com> (raw)
In-Reply-To: <87murle8da.fsf@evledraar.gmail.com>


On Wed, Oct 10 2018, Ævar Arnfjörð Bjarmason wrote:

> On Wed, Oct 10 2018, SZEDER Gábor wrote:
>
>> On Wed, Oct 10, 2018 at 11:56:45PM +0200, Ævar Arnfjörð Bjarmason wrote:
>>> On Wed, Oct 10 2018, SZEDER Gábor wrote:
>>
>>> >>  	for (i = 0; i < oids->nr; i++) {
>>> >> +		display_progress(progress, ++j);
>>>
>>> [...]
>>>
>>> > This display_progress() call, however, doesn't seem to be necessary.
>>> > First, it counts all commits for a second time, resulting in the ~2x
>>> > difference compared to the actual number of commits, and then causing
>>> > my confusion.  Second, all what this loop is doing is setting a flag
>>> > in commits that were already looked up and parsed in the above loops.
>>> > IOW this loop is very fast, and the progress indicator jumps from
>>> > ~780k right to 1.5M, even on my tiny laptop, so it doesn't need a
>>> > progress indicator at all.
>>>
>>> You're right, I tried this patch on top:
>>
>> [...]
>>
>>> And on a large repo with around 3 million commits the 3rd progress bar
>>> doesn't kick in.
>>>
>>> But if I apply this on top:
>>>
>> [...]
>>>
>>> I.e. start the timer after 1/4 of a second instead of 1 second, I get
>>> that progress bar.
>>>
>>> So I'm inclined to keep it. It just needs to be 4x the size before it's
>>> noticeably hanging for 1 second.
>>
>> Just to clarify: are you worried about a 1 second hang in an approx. 12
>> million commit repository?  If so, then I'm unconvinced, that's not
>> even a blip on the radar, and the misleading numbers are far worse.
>
> It's not a blip on the runtime, but the point of these progress bars in
> general is so we don't have a UI where there's no UI differnce between
> git hanging and just doing work in some tight loop in the background,
> and even 1 second when you're watching something is noticeable if it
> stalls.
>
> Also it's 1 second on a server where I had 128G of RAM. I think even a
> "trivial" flag change like this would very much change if e.g. the
> system was under memory pressure or was swapping.
>
> And as noted code like this tends to change over time, that loop might
> get more expensive, so let's future proof by having all the loops over N
> call the progress code.
>
> When I wrote this the intent was just "report progress". So that it's
> counting anything is just an implementation detail of how progress.c
> works now.
>
> This was the reference to Duy's patch, i.e. instead of spewing numbers
> at the user here let's just render a spinner. Then we no longer need to
> make judgement calls about which loop over N is expensive right now, and
> which one isn't, and if any of them will result in reporting a 2N number
> while the user might be more familiar with or expecting N.
>
>>> That repo isn't all that big compared to what we've heard about out
>>> there, and inner loops like this have a tendency to accumulate some more
>>> code over time without a re-visit of why we weren't monitoring progress
>>> there.
>>>
>>> But maybe we can fix the message. We say "Annotating commits in commit
>>> grap", not "Counting" or whatever. I was trying to find something that
>>> didn't imply that we were doing this once. One can annotate a thing more
>>> than once, but maybe ther's a better way to explain this...
>>
>> IMO just remove it.

Hrm, actually reading this again your initial post says we end up with a
2x difference v.s. the number of commits, but it's actually 3x. The loop
that has a rather trivial runtime comparatively is the 3x, but the 2x
loop takes a notable amount of time. So e.g. on git.git:

    $ git rev-list --all | wc -l; ~/g/git/git commit-graph write
    166678
    Annotating commits in commit graph: 518463, done.
    Computing commit graph generation numbers: 100% (172685/172685), done.

  reply	other threads:[~2018-10-11 17:52 UTC|newest]

Thread overview: 133+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-04 20:27 [PATCH 0/2] commit-graph: " Ævar Arnfjörð Bjarmason
2018-09-04 20:27 ` [PATCH 1/2] commit-graph write: " Ævar Arnfjörð Bjarmason
2018-09-04 21:16   ` Eric Sunshine
2018-09-04 22:07   ` Junio C Hamano
2018-09-05 11:58     ` Derrick Stolee
2018-09-05 12:07       ` Ævar Arnfjörð Bjarmason
2018-09-05 21:46       ` Junio C Hamano
2018-09-05 22:12         ` Derrick Stolee
2018-09-07 15:11       ` Ævar Arnfjörð Bjarmason
2018-09-07 15:23         ` Ævar Arnfjörð Bjarmason
2018-09-07 17:15           ` Jeff King
2018-09-07 17:25             ` Derrick Stolee
2018-09-05 12:06   ` Derrick Stolee
2018-09-07 12:40   ` Ævar Arnfjörð Bjarmason
2018-09-07 13:12     ` Derrick Stolee
2018-09-04 20:27 ` [PATCH 2/2] commit-graph verify: " Ævar Arnfjörð Bjarmason
2018-09-04 22:10   ` Junio C Hamano
2018-09-05 12:07 ` [PATCH 0/2] commit-graph: " Derrick Stolee
2018-09-07 18:29 ` [PATCH v2 " Ævar Arnfjörð Bjarmason
2018-09-11 20:26   ` Junio C Hamano
2018-09-07 18:29 ` [PATCH v2 1/2] commit-graph write: " Ævar Arnfjörð Bjarmason
2018-09-21 20:01   ` Derrick Stolee
2018-09-21 21:43     ` Junio C Hamano
2018-09-21 21:57       ` Junio C Hamano
2018-09-07 18:29 ` [PATCH v2 2/2] commit-graph verify: " Ævar Arnfjörð Bjarmason
2018-09-16  6:55   ` Duy Nguyen
2018-09-17 15:33     ` [PATCH v3 0/2] commit-graph: " Ævar Arnfjörð Bjarmason
2018-09-17 15:33     ` [PATCH v3 1/2] commit-graph write: " Ævar Arnfjörð Bjarmason
2018-10-10 20:37       ` SZEDER Gábor
2018-10-10 21:56         ` Ævar Arnfjörð Bjarmason
2018-10-10 22:19           ` SZEDER Gábor
2018-10-10 22:37             ` Ævar Arnfjörð Bjarmason
2018-10-11 17:52               ` Ævar Arnfjörð Bjarmason [this message]
2018-10-15 16:05                 ` SZEDER Gábor
2018-10-12  6:09         ` Junio C Hamano
2018-10-12 15:07           ` Ævar Arnfjörð Bjarmason
2018-10-12 15:12             ` Derrick Stolee
2018-10-15 16:54       ` SZEDER Gábor
2018-11-19 16:02         ` SZEDER Gábor
2018-11-19 20:23           ` [PATCH] commit-graph: split up close_reachable() " Ævar Arnfjörð Bjarmason
2018-11-19 20:38             ` Derrick Stolee
2018-11-19 22:57             ` SZEDER Gábor
2018-11-20 15:04               ` [PATCH 0/6] commit-graph write: progress output improvements Ævar Arnfjörð Bjarmason
2018-11-20 15:04               ` [PATCH 1/6] commit-graph write: rephrase confusing progress output Ævar Arnfjörð Bjarmason
2018-11-20 15:04               ` [PATCH 2/6] commit-graph write: add more " Ævar Arnfjörð Bjarmason
2018-11-20 16:58                 ` SZEDER Gábor
2018-11-20 19:50                   ` [PATCH v2 0/6] commit-graph write: progress output improvements Ævar Arnfjörð Bjarmason
2018-11-20 19:50                   ` [PATCH v2 1/6] commit-graph write: rephrase confusing progress output Ævar Arnfjörð Bjarmason
2018-11-20 19:50                   ` [PATCH v2 2/6] commit-graph write: add more " Ævar Arnfjörð Bjarmason
2018-11-20 23:38                     ` SZEDER Gábor
2018-11-20 19:50                   ` [PATCH v2 3/6] commit-graph write: show progress for object search Ævar Arnfjörð Bjarmason
2018-11-20 19:50                   ` [PATCH v2 4/6] commit-graph write: add more describing progress output Ævar Arnfjörð Bjarmason
2018-11-20 19:50                   ` [PATCH v2 5/6] commit-graph write: remove empty line for readability Ævar Arnfjörð Bjarmason
2018-11-20 19:50                   ` [PATCH v2 6/6] commit-graph write: add even more progress output Ævar Arnfjörð Bjarmason
2018-11-21  1:23                   ` SZEDER Gábor
2018-11-21  1:25                     ` [PATCH 1/2] commit-graph: rename 'num_extra_edges' variable to 'num_large_edges' SZEDER Gábor
2018-11-21  3:29                       ` Junio C Hamano
2018-11-21 11:32                         ` Derrick Stolee
2019-01-18 17:05                           ` [PATCH v2 0/2] commit-graph: minor cleanup and optimization SZEDER Gábor
2019-01-18 17:05                             ` [PATCH v2 1/2] commit-graph: rename "large edges" to "extra edges" SZEDER Gábor
2019-01-18 17:05                             ` [PATCH v2 2/2] commit-graph: don't call write_graph_chunk_large_edges() unnecessarily SZEDER Gábor
2019-01-19  9:32                               ` Martin Ågren
2019-01-18 19:41                             ` [PATCH v2 0/2] commit-graph: minor cleanup and optimization Junio C Hamano
2018-11-21  1:26                     ` [PATCH 2/2] commit-graph: don't call write_graph_chunk_large_edges() unnecessarily SZEDER Gábor
2018-11-21 11:33                       ` Derrick Stolee
2018-11-22 13:28                       ` [PATCH v3 00/10] commit-graph write: progress output improvements Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 01/10] commit-graph: rename 'num_extra_edges' variable to 'num_large_edges' Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 0/9] commit-graph write: progress output improvements Ævar Arnfjörð Bjarmason
2019-01-19  1:26                             ` Junio C Hamano
2019-01-19 20:21                             ` [PATCH v6 00/10] " Ævar Arnfjörð Bjarmason
2019-01-22 18:30                               ` Derrick Stolee
2019-01-23 17:52                                 ` Junio C Hamano
2019-01-22 19:37                               ` Junio C Hamano
2019-01-19 20:21                             ` [PATCH v6 01/10] commit-graph write: use pack order when finding commits Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 02/10] commit-graph: rename "large edges" to "extra edges" Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 03/10] commit-graph: don't call write_graph_chunk_large_edges() unnecessarily Ævar Arnfjörð Bjarmason
2019-01-23 17:51                               ` [PATCH v6.1 03/10] commit-graph: don't call write_graph_chunk_extra_edges() unnecessarily SZEDER Gábor
2019-01-19 20:21                             ` [PATCH v6 04/10] commit-graph write: add "Writing out" progress output Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 05/10] commit-graph write: more descriptive "writing out" output Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 06/10] commit-graph write: show progress for object search Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 07/10] commit-graph write: add more descriptive progress output Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 08/10] commit-graph write: remove empty line for readability Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 09/10] commit-graph write: add itermediate progress Ævar Arnfjörð Bjarmason
2019-01-19 20:21                             ` [PATCH v6 10/10] commit-graph write: emit a percentage for all progress Ævar Arnfjörð Bjarmason
2019-03-22 10:28                               ` [PATCH] commit-graph: don't show progress percentages while expanding reachable commits SZEDER Gábor
2019-03-22 11:11                                 ` Ævar Arnfjörð Bjarmason
2019-03-22 11:18                                   ` SZEDER Gábor
2019-03-22 14:28                                     ` Ævar Arnfjörð Bjarmason
2019-03-22 14:36                                       ` Ævar Arnfjörð Bjarmason
2019-03-22 14:55                                       ` SZEDER Gábor
2019-03-22 15:11                                         ` Ævar Arnfjörð Bjarmason
2019-03-22 15:49                                           ` SZEDER Gábor
2019-03-22 16:52                                             ` SZEDER Gábor
2019-03-22 17:23                                             ` Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 1/9] commit-graph: rename 'num_extra_edges' variable to 'num_large_edges' Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 2/9] commit-graph: don't call write_graph_chunk_large_edges() unnecessarily Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 3/9] commit-graph write: add "Writing out" progress output Ævar Arnfjörð Bjarmason
2019-01-18 17:16                             ` SZEDER Gábor
2019-01-16 13:29                           ` [PATCH v5 4/9] commit-graph write: more descriptive "writing out" output Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 5/9] commit-graph write: show progress for object search Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 6/9] commit-graph write: add more descriptive progress output Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 7/9] commit-graph write: remove empty line for readability Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 8/9] commit-graph write: add itermediate progress Ævar Arnfjörð Bjarmason
2019-01-16 13:29                           ` [PATCH v5 9/9] commit-graph write: emit a percentage for all progress Ævar Arnfjörð Bjarmason
2019-01-17 13:23                             ` [PATCH] commit-graph write: use pack order when finding commits Ævar Arnfjörð Bjarmason
2019-01-17 15:09                               ` Derrick Stolee
2019-01-17 16:35                                 ` Derrick Stolee
2018-11-22 15:39                         ` [PATCH v4 02/10] commit-graph: don't call write_graph_chunk_large_edges() unnecessarily Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 03/10] commit-graph write: rephrase confusing progress output Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 04/10] commit-graph write: add "Writing out" " Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 05/10] commit-graph write: more descriptive "writing out" output Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 06/10] commit-graph write: show progress for object search Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 07/10] commit-graph write: add more descriptive progress output Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 08/10] commit-graph write: remove empty line for readability Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 09/10] commit-graph write: add itermediate progress Ævar Arnfjörð Bjarmason
2018-11-22 15:39                         ` [PATCH v4 10/10] commit-graph write: emit a percentage for all progress Ævar Arnfjörð Bjarmason
2018-11-22 18:59                         ` [PATCH v3 00/10] commit-graph write: progress output improvements Eric Sunshine
2018-11-22 13:28                       ` [PATCH v3 01/10] commit-graph: rename 'num_extra_edges' variable to 'num_large_edges' Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 02/10] commit-graph: don't call write_graph_chunk_large_edges() unnecessarily Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 03/10] commit-graph write: rephrase confusing progress output Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 04/10] commit-graph write: add "Writing out" " Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 05/10] commit-graph write: more descriptive "writing out" output Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 06/10] commit-graph write: show progress for object search Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 07/10] commit-graph write: add more descriptive progress output Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 08/10] commit-graph write: remove empty line for readability Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 09/10] commit-graph write: add itermediate progress Ævar Arnfjörð Bjarmason
2018-11-22 13:28                       ` [PATCH v3 10/10] commit-graph write: emit a percentage for all progress Ævar Arnfjörð Bjarmason
2018-11-20 15:04               ` [PATCH 3/6] commit-graph write: show progress for object search Ævar Arnfjörð Bjarmason
2018-11-20 15:04               ` [PATCH 4/6] commit-graph write: add more describing progress output Ævar Arnfjörð Bjarmason
2018-11-20 15:04               ` [PATCH 5/6] commit-graph write: remove empty line for readability Ævar Arnfjörð Bjarmason
2018-11-20 15:04               ` [PATCH 6/6] commit-graph write: add even more progress output Ævar Arnfjörð Bjarmason
2018-09-17 15:33     ` [PATCH v3 2/2] commit-graph verify: add " Ævar Arnfjörð Bjarmason

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