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From: Taylor Blau <me@ttaylorr.com>
To: Derrick Stolee <derrickstolee@github.com>
Cc: git@vger.kernel.org, Jeff King <peff@peff.net>,
	Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v2 0/2] pack-bitmap: boundary-based bitmap traversalt
Date: Fri, 5 May 2023 14:46:14 -0400	[thread overview]
Message-ID: <ZFVO9kFZ+lr32WxY@nand.local> (raw)
In-Reply-To: <6c8d9142-9013-f3f0-0619-b3780b86b6ab@github.com>

On Fri, May 05, 2023 at 01:59:31PM -0400, Derrick Stolee wrote:
> On 5/5/2023 1:27 PM, Taylor Blau wrote:
> > Here is a reroll of my series to implement a boundary-based bitmap
> > traversal algorithm that I worked on towards the end of 2021 with Peff.
> >
> > The algorithm is unchanged from the last version, but the implementation
> > has been made much more straightforward, thanks to a very helpful
> > suggestion from Stolee.
> >
> > Instead of hackily trying to write down all of the UNINTERESTING commits
> > between the tips and boundary within limit_list(), we can just perform a
> > commit-only walk, which will give us the set of commits that we need.
>
> Something that didn't seem to get attention in this version was buried
> deep in the commentary of my high-level review [1]:

Oops, sorry, I definitely missed this unintentionally and did not mean
to ignore it.

> > For these reasons, I'm surprised that this patch completely replaces
> > the old algorithm for the new one. I would prefer to see a config
> > option that enables this new algorithm. It would be safer to deploy
> > that way, too.
>
> I still think it would be nice to keep the two algorithms for at least
> a little while instead of completely removing the old one. Let's gather
> some more evidence and get more reps in with the new algorithm before
> making it the new default. I could imagine a scenario where someone
> really wants to spend the extra time to make sure none of the objects
> reachable from the UNINTERESTING commits are included in the output of
> this diff.
>
> [1] https://lore.kernel.org/git/a143150d-7cf5-c697-0e48-0f7af1c6de8f@github.com/

Hmm. I'm not opposed to keeping the old algorithm around, though I
wonder what the configuration option would look like here. I imagine
that we don't want to support the old algorithm indefinitely, though.

Perhaps something like `pack.useBoundaryBitmapTraversal` (implied by
`feature.experimental`), defaulting to "false", and then eventually
"true"?

Thanks,
Taylor

  reply	other threads:[~2023-05-05 18:46 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-25  0:00 [PATCH 0/3] pack-bitmap: boundary-based bitmap traversal Taylor Blau
2023-04-25  0:00 ` [PATCH 1/3] revision: support tracking uninteresting commits Taylor Blau
2023-04-25 18:15   ` Derrick Stolee
2023-05-03 21:48     ` Taylor Blau
2023-05-04 13:46       ` Derrick Stolee
2023-05-03 22:08     ` Taylor Blau
2023-05-04 13:59       ` Derrick Stolee
2023-05-05 17:30         ` Taylor Blau
2023-04-25 18:22   ` Junio C Hamano
2023-04-25 18:48     ` Taylor Blau
2023-04-25  0:00 ` [PATCH 2/3] pack-bitmap.c: extract `fill_in_bitmap()` Taylor Blau
2023-04-25 18:32   ` Junio C Hamano
2023-04-25 18:51     ` [PATCH 2/3] pack-bitmap.c: extract `fill_in_bitmap()`t Taylor Blau
2023-04-25  0:00 ` [PATCH 3/3] pack-bitmap.c: use commit boundary during bitmap traversal Taylor Blau
2023-04-25 18:52   ` Junio C Hamano
2023-05-02 21:31     ` Felipe Contreras
2023-05-03 21:42     ` Taylor Blau
2023-05-03 21:58       ` Junio C Hamano
2023-04-25 18:53   ` Derrick Stolee
2023-04-25 18:02 ` [PATCH 0/3] pack-bitmap: boundary-based " Junio C Hamano
2023-04-25 18:30   ` Derrick Stolee
2023-04-25 18:57     ` Taylor Blau
2023-04-25 19:52       ` Derrick Stolee
2023-05-03 21:43         ` Taylor Blau
2023-04-25 18:06 ` Derrick Stolee
2023-04-25 19:01   ` Taylor Blau
2023-04-25 20:27     ` Derrick Stolee
2023-05-01 22:08 ` Junio C Hamano
2023-05-02 23:52   ` Taylor Blau
2023-05-05 17:27 ` [PATCH v2 0/2] " Taylor Blau
2023-05-05 17:27   ` [PATCH v2 1/2] pack-bitmap.c: extract `fill_in_bitmap()` Taylor Blau
2023-05-05 17:27   ` [PATCH v2 2/2] pack-bitmap.c: use commit boundary during bitmap traversal Taylor Blau
2023-05-05 18:13     ` Derrick Stolee
2023-05-05 18:43       ` Taylor Blau
2023-05-05 17:33   ` [PATCH v2 0/2] pack-bitmap: boundary-based " Junio C Hamano
2023-05-05 17:59   ` Derrick Stolee
2023-05-05 18:46     ` Taylor Blau [this message]
2023-05-05 20:45       ` [PATCH v2 0/2] pack-bitmap: boundary-based bitmap traversalt Derrick Stolee
2023-05-08 17:38 ` [PATCH v3 0/3] pack-bitmap: boundary-based bitmap traversal Taylor Blau
2023-05-08 17:38   ` [PATCH v3 1/3] object: add object_array initializer helper function Taylor Blau
2023-05-08 17:38   ` [PATCH v3 2/3] pack-bitmap.c: extract `fill_in_bitmap()` Taylor Blau
2023-05-08 17:38   ` [PATCH v3 3/3] pack-bitmap.c: use commit boundary during bitmap traversal Taylor Blau
2023-05-08 20:53     ` Derrick Stolee
2023-05-08 22:12       ` Taylor Blau
2023-05-10 22:55   ` [PATCH v3 0/3] pack-bitmap: boundary-based " Junio C Hamano
2023-05-10 23:10     ` Taylor Blau
2023-05-11 15:23       ` Derrick Stolee
2023-06-08 16:25 ` [PATCH v4 " Taylor Blau
2023-06-08 16:25   ` [PATCH v4 1/3] object: add object_array initializer helper function Taylor Blau
2023-06-08 16:25   ` [PATCH v4 2/3] pack-bitmap.c: extract `fill_in_bitmap()` Taylor Blau
2023-06-08 16:25   ` [PATCH v4 3/3] pack-bitmap.c: use commit boundary during bitmap traversal Taylor Blau

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