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From: "Ævar Arnfjörð Bjarmason" <>
To: Derrick Stolee <>
Cc: Taylor Blau <>,
	Johannes Schindelin via GitGitGadget <>,,
	Johannes Schindelin <>
Subject: Re: [PATCH] ci: avoid unnecessary builds
Date: Mon, 07 Nov 2022 23:56:30 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Mon, Nov 07 2022, Derrick Stolee wrote:

> On 11/7/22 4:03 PM, Ævar Arnfjörð Bjarmason wrote:
>> On Mon, Nov 07 2022, Derrick Stolee wrote:
>>> On 11/7/22 2:53 PM, Taylor Blau wrote:
>>>> I wonder how we should treat Ævar's concerns in this thread. I suspect
>>>> that the vast majority of workflows wouldn't be affected, but I don't
>>>> want to completely break Ævar's workflow, either ;-).
>>>> Some kind of configuration mechanism like I proposed might be nice.
>>>> Thoughts?
>>> Taking a look at that sub-thread, I have two thoughts:
>>> 1. I don't think supporting a "multiple pushes of WIP work"
>>>    scenario is a good use of "free" resources. If you want to
>>>    test multiple versions of something, then use multiple
>>>    branches (and I think Johannes's patch allows concurrent
>>>    builds for distinct branch names).
>> The setting Taylor proposed in
>> is off by
>> default, i.e. it would behave the same way as what Johannes is
>> proposing, just give you (well, me) an opt-out from the default, without
>> patching main.yml on every branch.
>> So it seems like a win-win, why force others to change their workflow?
>> Sure, I could push multiple branches, but you could also manually cancel
>> your outstanding jobs before re-pushing...
>> I agree that cancelling the outstanding job is a better default, and if
>> we had to pick one or the other I'd say "sure", but if we can have
>> both...
>>> Either of these points may have an incorrect assumption, so
>>> I'm prepared to be wrong.
>> I *think* you're wrong about #2, but I'm not sure either.
> At the very least, the configurable option requires fetching the
> repo and checking out at least one file. I don't know how much it
> actually saves one way or another.

It's already fetching the ci-config repo, so we're talking about the
marginal cost of running the bit of shellscript to check if
config-repo/ci/config/skip-concurrent is executable, and if not keeping
the default config.

>> I don't think you can be wrong about #1, "others should change their
>> workflow to fit a new worldview" is more of a value-judgment :)
> True, but I think that the workflow you are trying to keep valid
> is also indistinguishable to the typical flow of force-pushing
> during incremental rewrites, so preserving your workflow will
> continue to add costs to that behavior.

I don't think it will, per the above. I mean, pedantically yes: But the
cost of that "test -x and variable setting" is so trivial that it's not
worth worrying about.

> My value judgement is that experts can adapt their workflows as
> situations change for the better of the group.

Sure, I agree with that in zero-sum scenarios, or where it's a hassle to
provide two things, and we need to pick one etc. I just don't see that
being the case here.

> If the cost of doing the config option version is minimal over
> the global concurrency issue, then I say we should go that route.
> I just expect it to take up more resources than the strategy
> proposed in the initial patch.

Based on what? That you read it as us cloning the ci-config repo just
for this new proposed config, and missed that we're doing it already, or

> I wonder how we could determine this. Should we run a few CI
> jobs with some force-pushes in either approach (config turned
> off) so we know that cost?

The incremental cost of that "test -x", or...? I'm not sure what you
mean here.

  parent reply	other threads:[~2022-11-07 23:04 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-03 13:34 [PATCH] ci: avoid unnecessary builds Johannes Schindelin via GitGitGadget
2022-11-04  1:46 ` Ævar Arnfjörð Bjarmason
2022-11-04  2:23   ` Taylor Blau
2022-11-04  3:20     ` Jeff King
2022-11-08  9:16       ` Johannes Schindelin
2022-11-09 14:00         ` Jeff King
2022-11-10  2:40           ` Taylor Blau
2022-11-04  2:09 ` Taylor Blau
2022-11-07 19:45 ` Derrick Stolee
2022-11-07 19:53   ` Taylor Blau
2022-11-07 20:08     ` Derrick Stolee
2022-11-07 21:03       ` Ævar Arnfjörð Bjarmason
2022-11-07 21:59         ` Derrick Stolee
2022-11-07 22:44           ` Taylor Blau
2022-11-08  8:18             ` Johannes Schindelin
2022-11-08 18:30               ` Taylor Blau
2022-11-07 22:56           ` Ævar Arnfjörð Bjarmason [this message]
2022-11-08  0:02             ` Derrick Stolee
2022-11-08  0:31   ` Junio C Hamano
2022-11-08  9:51     ` Johannes Schindelin

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