Add a benchmark for workspace initialization#10754
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clap 3.2.3 disables the deprecations by default and people can enable them with the In theory, this should unblock CI so I re-kicked off the jobs. |
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remove unused dependency from benchsuite In #10754 I added a new benchmark to the benchsuite. While figuring out the best way to add the new benchmark, I added `cargo-test-support` as a dependency. It appears I missed removing it before making the PR. This PR removes `cargo-test-support` since it is not needed
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add a cache for discovered workspace roots ## History `@ehuss` [noticed that](#10736 (comment)) workspace inheritance caused a significant increase in startup times when using workspace inheritance. This brought up the creation of #10747. When using a similar test setup [to the original](#10736 (comment)) I got ``` Benchmark 1: cd rust; ../../../target/release/cargo metadata Time (mean ± σ): 149.4 ms ± 3.8 ms [User: 105.9 ms, System: 31.7 ms] Range (min … max): 144.2 ms … 162.2 ms 19 runs Benchmark 2: cd rust-ws-inherit; ../../../target/release/cargo metadata Time (mean ± σ): 191.6 ms ± 1.4 ms [User: 145.9 ms, System: 34.2 ms] Range (min … max): 188.8 ms … 193.9 ms 15 runs ``` This showed a large increase in time per cargo command when using workspace inheritance. During the investigation of this issue, other [performance concerns were found and addressed](#10761). This resulted in a drop in time across the board but heavily favored workspace inheritance. ``` Benchmark 1: cd rust; ../../../target/release/cargo metadata Time (mean ± σ): 139.3 ms ± 1.7 ms [User: 99.8 ms, System: 29.4 ms] Range (min … max): 137.1 ms … 144.5 ms 20 runs Benchmark 2: cd rust-ws-inherit; ../../../target/release/cargo metadata Time (mean ± σ): 161.7 ms ± 1.4 ms [User: 120.4 ms, System: 31.2 ms] Range (min … max): 158.0 ms … 164.6 ms 18 runs ``` ## Performance after changes `hyperfine --warmup 10 "cd rust; ../../../target/release/cargo metadata" "cd rust-ws-inherit; ../../../target/release/cargo metadata" --runs 40` ``` Benchmark 1: cd rust; ../../../target/release/cargo metadata Time (mean ± σ): 140.1 ms ± 1.5 ms [User: 99.5 ms, System: 30.7 ms] Range (min … max): 137.4 ms … 144.0 ms 40 runs Benchmark 2: cd rust-ws-inherit; ../../../target/release/cargo metadata Time (mean ± σ): 141.8 ms ± 1.6 ms [User: 100.9 ms, System: 30.9 ms] Range (min … max): 138.4 ms … 145.4 ms 40 runs ``` [New Benchmark](#10754) `cargo bench -- workspace_initialization/rust` ``` workspace_initialization/rust time: [14.779 ms 14.880 ms 14.997 ms] workspace_initialization/rust-ws-inherit time: [16.235 ms 16.293 ms 16.359 ms] ``` ## Changes Made - [Pulled a commit](bbd41a4) from `@ehuss` that deduplicated finding a workspace root to make the changes easier - Added a cache in `Config` to hold found `WorkspaceRootConfig`s - This makes it so manifests should only be parsed once - Made `WorkspaceRootConfig` get added to the cache when parsing a manifest ## Testing Steps To check the new benchmark: 1. `cd benches/benchsuite` 2. `cargo bench -- workspace_initialization/rust` Using `hyperfine`: 1. run `cargo build --release` 2. extract `rust` and `rust-ws-inherit` in `benches/workspaces` 3. cd `benches/workspaces` 4. Prime the target directory with a cache of `rustc` info. In `rust` and `rust-ws-inherit`, run: `cargo +nightly c -p linkchecker`. Otherwise it would be measuring `rustc` overhead. 4. run `hyperfine --warmup 10 "cd rust; ../../../target/release/cargo metadata" "cd rust-ws-inherit; ../../../target/release/cargo metadata" --runs 40` closes #10747
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It was suggested that a benchmark for workspace initialization should be added. This was suggested because there were issues with the performance of workspace inheritance as well as a general way to track the workspace initialization time across cargo changes
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resolve.rsto a sharedlib.rsenv!("CARGO_TARGET_TMPDIR")would fail to compile when put inside of the newlib.rs