From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: Garima Singh <garimasigit@gmail.com>,
Garima Singh via GitGitGadget <gitgitgadget@gmail.com>,
git@vger.kernel.org, jonathantanmy@google.com,
jeffhost@microsoft.com, me@ttaylorr.com, peff@peff.net,
jnareb@gmail.com, christian.couder@gmail.com,
emilyshaffer@gmail.com, gitster@pobox.com,
Garima Singh <garima.singh@microsoft.com>
Subject: Re: [PATCH v2 00/11] Changed Paths Bloom Filters
Date: Fri, 7 Feb 2020 17:15:28 +0100 [thread overview]
Message-ID: <20200207161528.GA18146@szeder.dev> (raw)
In-Reply-To: <88c8e5da-72f2-25cc-f55b-f62500c52a24@gmail.com>
On Fri, Feb 07, 2020 at 10:36:58AM -0500, Derrick Stolee wrote:
> On 2/7/2020 10:09 AM, Garima Singh wrote:
> >
> > On 2/7/2020 8:52 AM, SZEDER Gábor wrote:
> >>> * Added unit tests for the bloom filter computation layer
> >>
> >> This fails on big endian, e.g. in Travis CI's s390x build:
> >>
> >> https://travis-ci.org/szeder/git-cooking-topics-for-travis-ci/jobs/647253022#L2210
> >>
> >> (The link highlights the failure, but I'm afraid your browser won't
> >> jump there right away; you'll have to click on the print-test-failures
> >> fold at the bottom, and scroll down a bit...)
> >>
> >
> > Thank you so much for running this pipeline and pointing out the error!
> >
> > We will carefully review our interactions with the binary data and
> > hopefully solve this in the next version.
>
> Szeder,
>
> Thanks so much for running this test. We don't have access to a big endian
> machine right now, so could you please apply this patch and re-run your tests?
Unfortunately, it still failed:
https://travis-ci.org/szeder/git-cooking-topics-for-travis-ci/jobs/647395554#L2204
> The issue is described in the message below, and Garima is working to ensure
> the handling of the filter data is clarified in the next version.
>
> This is an issue from WAY back in the original prototype, and it highlights
> that we've never been writing the data in network-byte order. This is completely
> my fault.
>
> Thanks,
> -Stolee
>
>
> -->8--
>
> From c1067db5d618b2dae430dfe373a11c771517da9e Mon Sep 17 00:00:00 2001
> From: Derrick Stolee <dstolee@microsoft.com>
> Date: Fri, 7 Feb 2020 10:24:05 -0500
> Subject: [PATCH] fixup! bloom: core Bloom filter implementation for changed
> paths
>
> The 'data' field of 'struct bloom_filter' can point to a memory location
> (when computing one before writing to the commit-graph) or a memmap()'d
> file location (when reading from the Bloom data chunk of the commit-graph
> file). This means that the memory representation may be backwards in
> Little Endian or Big Endian machines.
>
> Always write and read bits from 'filter->data' using network order. This
> allows us to avoid loading the data streams from the file into memory
> buffers.
>
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
> bloom.c | 6 ++++--
> t/helper/test-bloom.c | 2 +-
> 2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/bloom.c b/bloom.c
> index 90d84dc713..aa6896584b 100644
> --- a/bloom.c
> +++ b/bloom.c
> @@ -124,8 +124,9 @@ void add_key_to_filter(struct bloom_key *key,
> for (i = 0; i < settings->num_hashes; i++) {
> uint64_t hash_mod = key->hashes[i] % mod;
> uint64_t block_pos = hash_mod / BITS_PER_WORD;
> + uint64_t bit = get_bitmask(hash_mod);
>
> - filter->data[block_pos] |= get_bitmask(hash_mod);
> + filter->data[block_pos] |= htonll(bit);
> }
> }
>
> @@ -269,7 +270,8 @@ int bloom_filter_contains(struct bloom_filter *filter,
> for (i = 0; i < settings->num_hashes; i++) {
> uint64_t hash_mod = key->hashes[i] % mod;
> uint64_t block_pos = hash_mod / BITS_PER_WORD;
> - if (!(filter->data[block_pos] & get_bitmask(hash_mod)))
> + uint64_t bit = get_bitmask(hash_mod);
> + if (!(filter->data[block_pos] & htonll(bit)))
> return 0;
> }
>
> diff --git a/t/helper/test-bloom.c b/t/helper/test-bloom.c
> index 9b4be97f75..09b2bb0a00 100644
> --- a/t/helper/test-bloom.c
> +++ b/t/helper/test-bloom.c
> @@ -23,7 +23,7 @@ static void print_bloom_filter(struct bloom_filter *filter) {
> printf("Filter_Length:%d\n", filter->len);
> printf("Filter_Data:");
> for (i = 0; i < filter->len; i++){
> - printf("%"PRIx64"|", filter->data[i]);
> + printf("%"PRIx64"|", ntohll(filter->data[i]));
> }
> printf("\n");
> }
> --
> 2.25.0.vfs.1.1.1.g9906319d24.dirty
>
>
>
next prev parent reply other threads:[~2020-02-07 16:15 UTC|newest]
Thread overview: 159+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-20 22:05 [PATCH 0/9] [RFC] Changed Paths Bloom Filters 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
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 [this message]
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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