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From: Jeff King <peff@peff.net>
To: Derrick Stolee <stolee@gmail.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH 2/3] prune: use bitmaps for reachability traversal
Date: Thu, 18 Apr 2019 15:49:53 -0400
Message-ID: <20190418194953.GA15249@sigill.intra.peff.net> (raw)
In-Reply-To: <49e2aa9b-ff22-a8d1-ba72-1c881ff5fab4@gmail.com>

On Mon, Apr 15, 2019 at 11:00:45AM -0400, Derrick Stolee wrote:

> >  void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
> >  			    timestamp_t mark_recent, struct progress *progress)
> [...]
> >  	cp.progress = progress;
> >  	cp.count = 0;
> >  
> > +	bitmap_git = prepare_bitmap_walk(revs);
> > +	if (bitmap_git) {
> > +		traverse_bitmap_commit_list(bitmap_git, mark_object_seen);
> > +		free_bitmap_index(bitmap_git);
> > +		return;
> > +	}
> > +
> 
> This block after "if (bitmap_git)" is not exercised by the (non-performance)
> test suite, so the rest of the code above is not tested, either. Could a test
> of this "prune" capability be added to the regression tests around the bitmaps?

I have somewhat mixed feelings here.  We can add a test with a trivial
bitmap to get code coverage here. But as with many optimizations
(bitmaps, but also your commit graph work), we get a much more thorough
correctness test by re-running the whole test suite (though we do not
yet have one for running with bitmaps on), and a better test that the
optimization is kicking in and working via the t/perf tests.

I dunno. I guess it does not hurt to at least to at least make sure this
code is running in the normal suite. I don't think that will find the
more interesting regressions, but at least saves us the from the most
egregious ones ("oops, the whole thing segfaults because somebody
changed the API" kinds of things).

-Peff

  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
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 [this message]
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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