From: Jakub Narebski <jnareb@gmail.com> To: "Garima Singh via GitGitGadget" <gitgitgadget@gmail.com> Cc: git@vger.kernel.org, stolee@gmail.com, szeder.dev@gmail.com, jonathantanmy@google.com, jeffhost@microsoft.com, me@ttaylorr.com, peff@peff.net, Junio C Hamano <gitster@pobox.com> Subject: Re: [PATCH 0/9] [RFC] Changed Paths Bloom Filters Date: Tue, 31 Dec 2019 17:45:51 +0100 [thread overview] Message-ID: <86d0c44f5s.fsf@gmail.com> (raw) In-Reply-To: <pull.497.git.1576879520.gitgitgadget@gmail.com> "Garima Singh via GitGitGadget" <gitgitgadget@gmail.com> writes: > Hey! > > The commit graph feature brought in a lot of performance improvements across > multiple commands. However, file based history continues to be a performance > pain point, especially in large repositories. > > Adopting changed path bloom filters has been discussed on the list before, > and a prototype version was worked on by SZEDER Gábor, Jonathan Tan and Dr. > Derrick Stolee [1]. This series is based on Dr. Stolee's approach [2] and > presents an updated and more polished RFC version of the feature. It is nice to have this picked up for upstream, finally. The proof of concept works[1][2] were started more than a year ago. On the other hand slow and steady adoption of commit-graph serialization and then extending it (generation numbers, topological sort, incremental update) feels like a good approach. > Performance Gains: We tested the performance of 'git log -- <path>' on the git > repo, the linux repo and some internal large repos, with a variety of paths > of varying depths. > > On the git and linux repos: We observed a 2x to 5x speed up. > > On a large internal repo with files seated 6-10 levels deep in the tree: We > observed 10x to 20x speed ups, with some paths going up to 28 times faster. Could you provide some more statistics about this internal repository, such as number of files, number of commits, perhaps also number of all objects? Thanks in advance. I wonder why such large difference in performance 2-5x vs 10-20x. Is it about the depth of the file hierarchy? How would the numbers look for files seated closer to the root in the same large repository, like 3-5 levels deep in the tree? > Future Work (not included in the scope of this series): > > 1. Supporting multiple path based revision walk I wonder if it would ever be possible to support globbing, e.g. '*.c' > 2. Adopting it in git blame logic. What about 'git log --follow <path>'? > 3. Interactions with line log git log -L > > This series is intended to start the conversation and many of the commit > messages include specific call outs for suggestions and thoughts. > > Cheers! Garima Singh > > [1] https://lore.kernel.org/git/20181009193445.21908-1-szeder.dev@gmail.com/ > [2] https://lore.kernel.org/git/61559c5b-546e-d61b-d2e1-68de692f5972@gmail.com/ > > Garima Singh (9): > commit-graph: add --changed-paths option to write This summary is not easy to understand on first glance. Maybe: commit-graph: add --changed-paths option to the write subcommand or commit-graph: add --changed-paths option to 'git commit-graph write' would be better? > commit-graph: write changed paths bloom filters > commit-graph: use MAX_NUM_CHUNKS > commit-graph: document bloom filter format > commit-graph: write changed path bloom filters to commit-graph file. > commit-graph: test commit-graph write --changed-paths > commit-graph: reuse existing bloom filters during write. > revision.c: use bloom filters to speed up path based revision walks > commit-graph: add GIT_TEST_COMMIT_GRAPH_BLOOM_FILTERS test flag > > Documentation/git-commit-graph.txt | 5 + > .../technical/commit-graph-format.txt | 17 ++ > Makefile | 1 + > bloom.c | 257 +++++++++++++++++ > bloom.h | 51 ++++ > builtin/commit-graph.c | 9 +- > ci/run-build-and-tests.sh | 1 + > commit-graph.c | 116 +++++++- > commit-graph.h | 9 +- > revision.c | 67 ++++- > revision.h | 5 + > t/README | 3 + > t/helper/test-read-graph.c | 4 + > t/t4216-log-bloom.sh | 77 ++++++ > t/t5318-commit-graph.sh | 2 + > t/t5324-split-commit-graph.sh | 1 + > t/t5325-commit-graph-bloom.sh | 258 ++++++++++++++++++ > 17 files changed, 875 insertions(+), 8 deletions(-) > create mode 100644 bloom.c > create mode 100644 bloom.h > create mode 100755 t/t4216-log-bloom.sh > create mode 100755 t/t5325-commit-graph-bloom.sh > > > base-commit: b02fd2accad4d48078671adf38fe5b5976d77304 > Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-497%2Fgarimasi514%2FcoreGit-bloomFilters-v1 > Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-497/garimasi514/coreGit-bloomFilters-v1 > Pull-Request: https://github.com/gitgitgadget/git/pull/497
next prev parent reply other threads:[~2019-12-31 16:45 UTC|newest] Thread overview: 159+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-12-20 22:05 Garima Singh via GitGitGadget 2019-12-20 22:05 ` [PATCH 1/9] commit-graph: add --changed-paths option to write Garima Singh via GitGitGadget 2020-01-01 20:20 ` Jakub Narebski 2019-12-20 22:05 ` [PATCH 2/9] commit-graph: write changed paths bloom filters Garima Singh via GitGitGadget 2019-12-21 16:48 ` Philip Oakley 2020-01-06 18:44 ` Jakub Narebski 2020-01-13 19:48 ` Garima Singh 2019-12-20 22:05 ` [PATCH 3/9] commit-graph: use MAX_NUM_CHUNKS Garima Singh via GitGitGadget 2020-01-07 12:19 ` Jakub Narebski 2019-12-20 22:05 ` [PATCH 4/9] commit-graph: document bloom filter format Garima Singh via GitGitGadget 2020-01-07 14:46 ` Jakub Narebski 2019-12-20 22:05 ` [PATCH 5/9] commit-graph: write changed path bloom filters to commit-graph file Garima Singh via GitGitGadget 2020-01-07 16:01 ` Jakub Narebski 2020-01-14 15:14 ` Garima Singh 2019-12-20 22:05 ` [PATCH 6/9] commit-graph: test commit-graph write --changed-paths Garima Singh via GitGitGadget 2020-01-08 0:32 ` Jakub Narebski 2019-12-20 22:05 ` [PATCH 7/9] commit-graph: reuse existing bloom filters during write Garima Singh via GitGitGadget 2020-01-09 19:12 ` Jakub Narebski 2019-12-20 22:05 ` [PATCH 8/9] revision.c: use bloom filters to speed up path based revision walks Garima Singh via GitGitGadget 2020-01-11 0:27 ` Jakub Narebski 2020-01-15 0:08 ` Garima Singh 2019-12-20 22:05 ` [PATCH 9/9] commit-graph: add GIT_TEST_COMMIT_GRAPH_BLOOM_FILTERS test flag Garima Singh via GitGitGadget 2020-01-11 19:56 ` Jakub Narebski 2020-01-15 0:55 ` Garima Singh 2019-12-20 22:14 ` [PATCH 0/9] [RFC] Changed Paths Bloom Filters Junio C Hamano 2019-12-22 9:26 ` Christian Couder 2019-12-22 9:38 ` Jeff King 2020-01-01 12:04 ` Jakub Narebski 2019-12-22 9:30 ` Jeff King 2019-12-22 9:32 ` [PATCH 1/3] commit-graph: examine changed-path objects in pack order Jeff King 2019-12-27 14:51 ` Derrick Stolee 2019-12-29 6:12 ` Jeff King 2019-12-29 6:28 ` Jeff King 2019-12-30 14:37 ` Derrick Stolee 2019-12-30 14:51 ` Derrick Stolee 2019-12-22 9:32 ` [PATCH 2/3] commit-graph: free large diffs, too Jeff King 2019-12-27 14:52 ` Derrick Stolee 2019-12-22 9:32 ` [PATCH 3/3] commit-graph: stop using full rev_info for diffs Jeff King 2019-12-27 14:53 ` Derrick Stolee 2019-12-26 14:21 ` [PATCH 0/9] [RFC] Changed Paths Bloom Filters Derrick Stolee 2019-12-29 6:03 ` Jeff King 2019-12-27 16:11 ` Derrick Stolee 2019-12-29 6:24 ` Jeff King 2019-12-30 16:04 ` Derrick Stolee 2019-12-30 17:02 ` Junio C Hamano 2019-12-31 16:45 ` Jakub Narebski [this message] 2020-01-13 16:54 ` Garima Singh 2020-01-20 13:48 ` Jakub Narebski 2020-01-21 16:14 ` Garima Singh 2020-02-02 18:43 ` Jakub Narebski 2020-01-21 23:40 ` Emily Shaffer 2020-01-27 18:24 ` Garima Singh 2020-02-01 23:32 ` Jakub Narebski 2020-02-05 22:56 ` [PATCH v2 00/11] " Garima Singh via GitGitGadget 2020-02-05 22:56 ` [PATCH v2 01/11] commit-graph: use MAX_NUM_CHUNKS Garima Singh via GitGitGadget 2020-02-09 12:39 ` Jakub Narebski 2020-02-05 22:56 ` [PATCH v2 02/11] bloom: core Bloom filter implementation for changed paths Garima Singh via GitGitGadget 2020-02-15 17:17 ` Jakub Narebski 2020-02-16 16:49 ` Jakub Narebski 2020-02-22 0:32 ` Garima Singh 2020-02-23 13:38 ` Jakub Narebski 2020-02-24 17:34 ` Garima Singh 2020-02-24 18:20 ` Jakub Narebski 2020-02-05 22:56 ` [PATCH v2 03/11] diff: halt tree-diff early after max_changes Derrick Stolee via GitGitGadget 2020-02-17 0:00 ` Jakub Narebski 2020-02-22 0:37 ` Garima Singh 2020-02-05 22:56 ` [PATCH v2 04/11] commit-graph: compute Bloom filters for changed paths Garima Singh via GitGitGadget 2020-02-17 21:56 ` Jakub Narebski 2020-02-22 0:55 ` Garima Singh 2020-02-23 17:34 ` Jakub Narebski 2020-02-05 22:56 ` [PATCH v2 05/11] commit-graph: examine changed-path objects in pack order Jeff King via GitGitGadget 2020-02-18 17:59 ` Jakub Narebski 2020-02-24 18:29 ` Garima Singh 2020-02-05 22:56 ` [PATCH v2 06/11] commit-graph: examine commits by generation number Derrick Stolee via GitGitGadget 2020-02-19 0:32 ` Jakub Narebski 2020-02-24 20:45 ` Garima Singh 2020-02-05 22:56 ` [PATCH v2 07/11] commit-graph: write Bloom filters to commit graph file Garima Singh via GitGitGadget 2020-02-19 15:13 ` Jakub Narebski 2020-02-24 21:14 ` Garima Singh 2020-02-25 11:40 ` Jakub Narebski 2020-02-25 15:58 ` Garima Singh 2020-02-05 22:56 ` [PATCH v2 08/11] commit-graph: reuse existing Bloom filters during write Garima Singh via GitGitGadget 2020-02-20 18:48 ` Jakub Narebski 2020-02-24 21:45 ` Garima Singh 2020-02-05 22:56 ` [PATCH v2 09/11] commit-graph: add --changed-paths option to write subcommand Garima Singh via GitGitGadget 2020-02-20 20:28 ` Jakub Narebski 2020-02-24 21:51 ` Garima Singh 2020-02-25 12:10 ` Jakub Narebski 2020-02-20 22:10 ` Bryan Turner 2020-02-22 1:44 ` Garima Singh 2020-02-05 22:56 ` [PATCH v2 10/11] revision.c: use Bloom filters to speed up path based revision walks Garima Singh via GitGitGadget 2020-02-21 17:31 ` Jakub Narebski 2020-02-21 22:45 ` Jakub Narebski 2020-02-05 22:56 ` [PATCH v2 11/11] commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag Garima Singh via GitGitGadget 2020-02-22 0:11 ` Jakub Narebski 2020-02-07 13:52 ` [PATCH v2 00/11] Changed Paths Bloom Filters SZEDER Gábor 2020-02-07 15:09 ` Garima Singh 2020-02-07 15:36 ` Derrick Stolee 2020-02-07 16:15 ` SZEDER Gábor 2020-02-07 16:33 ` Derrick Stolee 2020-02-11 19:08 ` Garima Singh 2020-02-08 23:04 ` Jakub Narebski 2020-02-21 17:41 ` Garima Singh 2020-03-29 18:36 ` Junio C Hamano 2020-03-30 0:31 ` [PATCH v3 00/16] " Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 01/16] commit-graph: define and use MAX_NUM_CHUNKS Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 02/16] bloom.c: add the murmur3 hash implementation Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 03/16] bloom.c: introduce core Bloom filter constructs Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 04/16] bloom.c: core Bloom filter implementation for changed paths Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 05/16] diff: halt tree-diff early after max_changes Derrick Stolee via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 06/16] commit-graph: compute Bloom filters for changed paths Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 07/16] commit-graph: examine changed-path objects in pack order Jeff King via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 08/16] commit-graph: examine commits by generation number Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 09/16] diff: skip batch object download when possible Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 10/16] commit-graph: write Bloom filters to commit graph file Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 11/16] commit-graph: reuse existing Bloom filters during write Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 12/16] commit-graph: add --changed-paths option to write subcommand Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 13/16] revision.c: use Bloom filters to speed up path based revision walks Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 14/16] revision.c: add trace2 stats around Bloom filter usage Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 15/16] t4216: add end to end tests for git log with Bloom filters Garima Singh via GitGitGadget 2020-03-30 0:31 ` [PATCH v3 16/16] commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 00/15] Changed Paths Bloom Filters Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 01/15] commit-graph: define and use MAX_NUM_CHUNKS Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 02/15] bloom.c: add the murmur3 hash implementation Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 03/15] bloom.c: introduce core Bloom filter constructs Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 04/15] bloom.c: core Bloom filter implementation for changed paths Garima Singh via GitGitGadget 2020-06-27 15:53 ` SZEDER Gábor 2020-04-06 16:59 ` [PATCH v4 05/15] diff: halt tree-diff early after max_changes Derrick Stolee via GitGitGadget 2020-08-04 14:47 ` SZEDER Gábor 2020-08-04 16:25 ` Derrick Stolee 2020-08-04 17:00 ` SZEDER Gábor 2020-08-04 17:31 ` Derrick Stolee 2020-08-05 17:08 ` Derrick Stolee 2020-04-06 16:59 ` [PATCH v4 06/15] commit-graph: compute Bloom filters for changed paths Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 07/15] commit-graph: examine changed-path objects in pack order Jeff King via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 08/15] commit-graph: examine commits by generation number Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 09/15] commit-graph: write Bloom filters to commit graph file Garima Singh via GitGitGadget 2020-05-29 8:57 ` SZEDER Gábor 2020-05-29 13:35 ` Derrick Stolee 2020-05-31 17:23 ` SZEDER Gábor 2020-07-09 17:00 ` [PATCH] commit-graph: fix "Writing out commit graph" progress counter SZEDER Gábor 2020-07-09 18:01 ` Derrick Stolee 2020-07-09 18:20 ` Derrick Stolee 2020-04-06 16:59 ` [PATCH v4 10/15] commit-graph: reuse existing Bloom filters during write Garima Singh via GitGitGadget 2020-06-19 14:02 ` SZEDER Gábor 2020-06-19 19:28 ` Junio C Hamano 2020-07-27 21:33 ` SZEDER Gábor 2020-04-06 16:59 ` [PATCH v4 11/15] commit-graph: add --changed-paths option to write subcommand Garima Singh via GitGitGadget 2020-06-07 22:21 ` SZEDER Gábor 2020-04-06 16:59 ` [PATCH v4 12/15] revision.c: use Bloom filters to speed up path based revision walks Garima Singh via GitGitGadget 2020-06-26 6:34 ` SZEDER Gábor 2020-04-06 16:59 ` [PATCH v4 13/15] revision.c: add trace2 stats around Bloom filter usage Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 14/15] t4216: add end to end tests for git log with Bloom filters Garima Singh via GitGitGadget 2020-04-06 16:59 ` [PATCH v4 15/15] commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag Garima Singh via GitGitGadget 2020-04-08 15:51 ` [PATCH v4 00/15] Changed Paths Bloom Filters Derrick Stolee 2020-04-08 19:21 ` Junio C Hamano 2020-04-08 20:05 ` Jakub Narębski 2020-04-12 20:34 ` Taylor Blau 2020-03-05 19:49 ` [PATCH 0/9] [RFC] " Garima Singh
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