Test the Resolver against the varisat Library #6980
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cc @jix |
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@bors: r+ Nice! I won't really pretend to understand what's going on here, but having more tests always sounds good to me! |
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📌 Commit e08d032 has been approved by |
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Test the Resolver against the varisat Library Resolution can be reduced to the SAT problem. So this is an alternative implementation of the resolver that uses a SAT library for the hard work. This is intended to be easy to read, as compared to the real resolver, and run as part of the test sweet to make sure the real resolver works as expected. Part of #6120. Some notes on performance: The initial version did not support public & private deps: ~64 loc, `O(nln(n))` vars, `O(nln(n) + n*d)` clauses, 0.5x slower on `prop_passes_validation` The final version: ~163 loc, `O(dn^2`) vars, `O(dn^3)` clauses, 1.5x slower on `prop_passes_validation` That comparison makes me feel better about spending months trying to get public & private deps to be fast enough for stabilization.
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☀️ Test successful - checks-travis, status-appveyor |
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So after this PR |
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May 30, 2019
the testing SAT solver was messed up by a refactor This fixes a mistake in #6980 introduced in [this commit](c68334f#diff-4317936c037e49f70800a86656c67569L308). This also reverts [8458661](8458661) with some test cases to show that it was wrong. This only causes problems when proptest is set to make public dependencies (witch is not true on master) and it gens a `reverse_alphabetical` example. Despite the low impact of these bugs, I would like it to be left incorrect as short as possible.
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Update cargo Update cargo 19 commits in 545f354259be4e9745ea00a524c0e4c51df01aa6..807429e1b6da4e2ec52488ef2f59e77068c31e1f 2019-05-23 17:45:30 +0000 to 2019-06-11 14:06:10 +0000 - Stabilize publish-lockfile. (rust-lang/cargo#7026) - change package cache lock message (rust-lang/cargo#7029) - Fix documenting an example. (rust-lang/cargo#7023) - Fix nonconcurrent tests (rust-lang/cargo#6900) - Update git2 crates for libgit2 0.28 (rust-lang/cargo#7018) - fix bunch of clippy warnings (rust-lang/cargo#7019) - Ignore remap-path-prefix in metadata hash. (rust-lang/cargo#6966) - Don't synthesize feature diretives for non-optional deps (rust-lang/cargo#7010) - Handle pipelined tests of libraries (rust-lang/cargo#7008) - Import the cargo-vendor subcommand into Cargo (rust-lang/cargo#6869) - Remove unnecessary outlives bounds (rust-lang/cargo#7000) - Catch filename output collisions in rustdoc. (rust-lang/cargo#6998) - the testing SAT solver was messed up by a refactor (rust-lang/cargo#6995) - Add some hints to the docs for `cfg()` targets (rust-lang/cargo#6990) - Test the Resolver against the varisat Library (rust-lang/cargo#6980) - Update changelog. (rust-lang/cargo#6984) - Update cache-messages tracking issue. (rust-lang/cargo#6987) - zsh: Add --all-targets option to cargo-check and cargo-build (rust-lang/cargo#6985) - Fix typo (rust-lang/cargo#6982)
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Update cargo Update cargo 19 commits in 545f354259be4e9745ea00a524c0e4c51df01aa6..807429e1b6da4e2ec52488ef2f59e77068c31e1f 2019-05-23 17:45:30 +0000 to 2019-06-11 14:06:10 +0000 - Stabilize publish-lockfile. (rust-lang/cargo#7026) - change package cache lock message (rust-lang/cargo#7029) - Fix documenting an example. (rust-lang/cargo#7023) - Fix nonconcurrent tests (rust-lang/cargo#6900) - Update git2 crates for libgit2 0.28 (rust-lang/cargo#7018) - fix bunch of clippy warnings (rust-lang/cargo#7019) - Ignore remap-path-prefix in metadata hash. (rust-lang/cargo#6966) - Don't synthesize feature diretives for non-optional deps (rust-lang/cargo#7010) - Handle pipelined tests of libraries (rust-lang/cargo#7008) - Import the cargo-vendor subcommand into Cargo (rust-lang/cargo#6869) - Remove unnecessary outlives bounds (rust-lang/cargo#7000) - Catch filename output collisions in rustdoc. (rust-lang/cargo#6998) - the testing SAT solver was messed up by a refactor (rust-lang/cargo#6995) - Add some hints to the docs for `cfg()` targets (rust-lang/cargo#6990) - Test the Resolver against the varisat Library (rust-lang/cargo#6980) - Update changelog. (rust-lang/cargo#6984) - Update cache-messages tracking issue. (rust-lang/cargo#6987) - zsh: Add --all-targets option to cargo-check and cargo-build (rust-lang/cargo#6985) - Fix typo (rust-lang/cargo#6982)
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Jun 18, 2019
Update cargo Update cargo 19 commits in 545f354259be4e9745ea00a524c0e4c51df01aa6..807429e1b6da4e2ec52488ef2f59e77068c31e1f 2019-05-23 17:45:30 +0000 to 2019-06-11 14:06:10 +0000 - Stabilize publish-lockfile. (rust-lang/cargo#7026) - change package cache lock message (rust-lang/cargo#7029) - Fix documenting an example. (rust-lang/cargo#7023) - Fix nonconcurrent tests (rust-lang/cargo#6900) - Update git2 crates for libgit2 0.28 (rust-lang/cargo#7018) - fix bunch of clippy warnings (rust-lang/cargo#7019) - Ignore remap-path-prefix in metadata hash. (rust-lang/cargo#6966) - Don't synthesize feature diretives for non-optional deps (rust-lang/cargo#7010) - Handle pipelined tests of libraries (rust-lang/cargo#7008) - Import the cargo-vendor subcommand into Cargo (rust-lang/cargo#6869) - Remove unnecessary outlives bounds (rust-lang/cargo#7000) - Catch filename output collisions in rustdoc. (rust-lang/cargo#6998) - the testing SAT solver was messed up by a refactor (rust-lang/cargo#6995) - Add some hints to the docs for `cfg()` targets (rust-lang/cargo#6990) - Test the Resolver against the varisat Library (rust-lang/cargo#6980) - Update changelog. (rust-lang/cargo#6984) - Update cache-messages tracking issue. (rust-lang/cargo#6987) - zsh: Add --all-targets option to cargo-check and cargo-build (rust-lang/cargo#6985) - Fix typo (rust-lang/cargo#6982)
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Resolution can be reduced to the SAT problem. So this is an alternative implementation of the resolver that uses a SAT library for the hard work. This is intended to be easy to read, as compared to the real resolver, and run as part of the test sweet to make sure the real resolver works as expected. Part of #6120.
Some notes on performance:
The initial version did not support public & private deps:
~64 loc,
O(nln(n))vars,O(nln(n) + n*d)clauses, 0.5x slower onprop_passes_validationThe final version:
~163 loc,
O(dn^2) vars,O(dn^3)clauses, 1.5x slower onprop_passes_validationThat comparison makes me feel better about spending months trying to get public & private deps to be fast enough for stabilization.