From: SZEDER Gábor <email@example.com> To: Ævar Arnfjörð Bjarmason <firstname.lastname@example.org> Cc: Jeff King <email@example.com>, Derrick Stolee <firstname.lastname@example.org>, Junio C Hamano <email@example.com>, Eric Wong <firstname.lastname@example.org>, email@example.com Subject: Re: [PATCH v3] repack: enable bitmaps by default on bare repos Date: Fri, 24 May 2019 14:34:19 +0200 Message-ID: <20190524123419.GI951@szeder.dev> (raw) In-Reply-To: <firstname.lastname@example.org> On Fri, May 24, 2019 at 01:58:03PM +0200, Ævar Arnfjörð Bjarmason wrote: > > On Fri, May 24 2019, SZEDER Gábor wrote: > > > 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. > > Do you also expect base packs with an associated bitmap to have an > implicit *.keep flag under gc with pack.writeBitmaps=false and > pack.useBitmaps=true? I don't understand what an "implicit *.keep flag" is. However, since a reachability bitmap is always associated with a pack, but the commit-graph is not, I don't think this is a valid comparison. > >> 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 index 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 2019-05-24 11:58 ` Ævar Arnfjörð Bjarmason 2019-05-24 12:34 ` SZEDER Gábor [this message] 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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