Enable PGO for macOS ARM64 Ruff releases - #27572
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Typing conformance resultsNo changes detected ✅Current numbersThe percentage of diagnostics emitted that were expected errors held steady at 96.96%. The percentage of expected errors that received a diagnostic held steady at 92.96%. The number of fully passing files held steady at 106/133. |
Memory usage reportMemory usage unchanged ✅ |
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| code | total | + violation | - violation | + fix | - fix |
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| non-augmented-assignment | 1 | 1 | 0 | 0 | 0 |
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Summary
Extend the existing profile-guided Ruff release pipeline to native Apple Silicon macOS builds. We build an instrumented release executable, train
checkandformaton the same eight SHA-pinned Python ecosystem projects, and pass the merged LLVM profile into the existing maturin wheel build.The instrumented and optimized builds retain our existing Mach-O LLD and identical-code-folding flags. The final build also disables C and C++ profiling so Apple Clang does not attempt to consume profile data produced by Rust's LLVM toolchain.
Only the
aarch64-apple-darwinrelease job changes. Wheels and standalone archives continue to use the same optimized executable.The native macOS release job completed successfully: profile generation took 4 minutes 39 seconds, followed by a 2-minute-37-second optimized wheel build. Compared with the matching non-PGO release artifacts, the compressed standalone artifact decreased by 1.1% and the wheel artifact decreased by 0.9%.
macOS ARM64 performance
Compared the actual non-PGO and PGO macOS ARM64 release binaries on an Apple M5 Max with eight Rayon threads. Both binaries have identical Ruff 0.16.1 source, workspace dependencies,
Cargo.lock, Rust 1.97.1 toolchain, deployment target, and Mach-O linker/ICF flags. Benchmarks covered 5,396 held-out Python and stub files totaling 90.57 MB, with five warmup pairs and thirty alternating baseline/candidate pairs per workload.ruff checkruff formatAcross all ten workloads, wall time improved by 6.8% and CPU time improved by 7.8%. PGO won 257 of 300 paired wall-time comparisons and 273 of 300 paired CPU comparisons. The stripped executable decreased from 23.80 MB to 23.62 MB.
Stacked on #27570.