From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Jeff King <peff@peff.net>, Derrick Stolee <dstolee@microsoft.com>,
Junio C Hamano <gitster@pobox.com>, Eric Wong <e@80x24.org>,
git@vger.kernel.org
Subject: Re: [PATCH v3] repack: enable bitmaps by default on bare repos
Date: Fri, 24 May 2019 13:41:14 +0200 [thread overview]
Message-ID: <20190524114114.GH951@szeder.dev> (raw)
In-Reply-To: <87imu0f6fh.fsf@evledraar.gmail.com>
On Fri, May 24, 2019 at 01:17:06PM +0200, Ævar Arnfjörð Bjarmason wrote:
>
> On Fri, May 24 2019, SZEDER Gábor wrote:
>
> > On Fri, May 24, 2019 at 11:01:39AM +0200, Ævar Arnfjörð Bjarmason wrote:
> >> I don't think it's a performance problem to have an old commit-graph
> >> lying around. But if you turn on the commit-graph, run gc a bunch, then
> >> turn it off in config we'll have it lying around forever, even if you do
> >> subsequent gc's.
> >>
> >> So I think we should delete such things on the general principle that
> >> the end-state of a gc's shouldn't be the accumulation of the values of
> >> past configuration options if we can help it.
> >>
> >> Maybe that screws over other users who did a "commit-graph write"
> >> without setting gc.writeCommitGraph, but I think the only sane thing to
> >> do is to make "gc" fully 'own' such things if its turned on at all.
> >
> > Note that there is 'core.commitGraph' as well; as long as it's
> > enabled, no commit-graph files should be deleted.
>
> Why? If we won't update it or write it if it's not there, why keep it
> around?
To read it, if 'core.commitGraph' says that is should be read.
> It means the commit-graph code and anything else (like bitmaps) needs to
> deal with stale data for the common and default gc --auto case.
>
> You also can't have e.g. a global core.commitGraph=true config along
> with a per-repo gc.writeCommitGraph=true config do what you expect.
>
> Now just because you wanted to write it for some you'll end up keeping
> it around forever because you'd also want to optimistically always use
> it if it's there.
This is exactly what I expect it to do.
> Note that I'm talking about the *default* gc semantics, they don't have
> to cover all advanced use-cases, just be good enough for most, and it's
> also important that they're as simple as possible, and don't result in
> stuff like "my performance sucks because I turned this config option on
> once a year ago for 2 days".
next prev parent reply other threads:[~2019-05-24 11:41 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 4:31 [PATCH 0/3] some prune optimizations Jeff King
2019-02-14 4:35 ` [PATCH 1/3] prune: lazily perform reachability traversal Jeff King
2019-02-14 10:54 ` Eric Sunshine
2019-02-14 11:07 ` Jeff King
2019-02-14 4:37 ` [PATCH 2/3] prune: use bitmaps for " Jeff King
2019-03-09 2:49 ` bitmaps by default? [was: prune: use bitmaps for reachability traversal] Eric Wong
2019-03-10 23:39 ` Jeff King
2019-03-12 3:13 ` [PATCH] repack: enable bitmaps by default on bare repos Eric Wong
2019-03-12 9:07 ` Ævar Arnfjörð Bjarmason
2019-03-12 10:49 ` Jeff King
2019-03-12 12:05 ` Jeff King
2019-03-13 1:51 ` Eric Wong
2019-03-13 14:54 ` Jeff King
2019-03-14 9:12 ` [PATCH v3] " Eric Wong
2019-03-14 16:02 ` Jeff King
2019-03-15 6:21 ` [PATCH 0/2] enable bitmap hash-cache by default Jeff King
2019-03-15 6:22 ` [PATCH 1/2] t5310: correctly remove bitmaps for jgit test Jeff King
2019-03-15 13:25 ` SZEDER Gábor
2019-03-15 18:36 ` Jeff King
2019-03-15 6:25 ` [PATCH 2/2] pack-objects: default to writing bitmap hash-cache Jeff King
2019-04-09 15:10 ` [PATCH v3] repack: enable bitmaps by default on bare repos Ævar Arnfjörð Bjarmason
2019-04-10 22:57 ` Jeff King
2019-04-25 7:16 ` Junio C Hamano
2019-05-04 1:37 ` Jeff King
2019-05-04 6:52 ` Ævar Arnfjörð Bjarmason
2019-05-04 13:23 ` SZEDER Gábor
2019-05-08 20:17 ` Ævar Arnfjörð Bjarmason
2019-05-09 4:24 ` Junio C Hamano
2019-05-07 7:45 ` Jeff King
2019-05-07 8:12 ` Ævar Arnfjörð Bjarmason
2019-05-08 7:11 ` Jeff King
2019-05-08 14:20 ` Derrick Stolee
2019-05-08 16:13 ` Ævar Arnfjörð Bjarmason
2019-05-08 22:25 ` Jeff King
2019-05-23 11:30 ` Jeff King
2019-05-23 12:53 ` Derrick Stolee
2019-05-24 7:24 ` Jeff King
2019-05-24 10:33 ` Derrick Stolee
2019-05-23 19:26 ` Ævar Arnfjörð Bjarmason
2019-05-24 7:27 ` Jeff King
2019-05-24 7:55 ` Ævar Arnfjörð Bjarmason
2019-05-24 8:26 ` Jeff King
2019-05-24 9:01 ` Ævar Arnfjörð Bjarmason
2019-05-24 9:29 ` SZEDER Gábor
2019-05-24 11:17 ` Ævar Arnfjörð Bjarmason
2019-05-24 11:41 ` SZEDER Gábor [this message]
2019-05-24 11:58 ` Ævar Arnfjörð Bjarmason
2019-05-24 12:34 ` SZEDER Gábor
2019-05-24 13:41 ` Ævar Arnfjörð Bjarmason
2019-05-24 11:31 ` [PATCH] pack-bitmap: look for an uninteresting bitmap Derrick Stolee
2019-04-15 15:00 ` [PATCH 2/3] prune: use bitmaps for reachability traversal Derrick Stolee
2019-04-18 19:49 ` Jeff King
2019-04-18 20:08 ` [PATCH] t5304: add a test for pruning with bitmaps Jeff King
2019-04-20 1:01 ` Derrick Stolee
2019-04-20 3:24 ` Jeff King
2019-04-20 21:01 ` Derrick Stolee
2019-02-14 4:38 ` [PATCH 3/3] prune: check SEEN flag for reachability Jeff King
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