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Low Level Tools/2019Q2: Difference between revisions
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Land 5 changes that speed up or reduce peak memory usage of rustc. | Land 5 changes that speed up or reduce peak memory usage of rustc. | ||
* [https://github.com/rust-lang/rust/pull/59693 Increase `Span` from 4 bytes to 8 bytes.] A big win across lots of workloads, especially larger crates: some <tt>script-servo</tt> builds are 15% faster. | * [https://github.com/rust-lang/rust/pull/59693 Increase `Span` from 4 bytes to 8 bytes.] A big win across lots of workloads, especially larger crates: some <tt>script-servo</tt> builds are 15% faster. | ||
* [https://github.com/rust-lang/rust/pull/61253 Avoid `hygiene_data` lookups.] Up to 10% win on packed-simd, up to 3% on numerous others. | |||
* [https://github.com/rust-lang/rust/pull/59626 Reduce the `DepNode` pre-allocation ratio.] Reduces peak memory use by 20 MiB on some workloads. | * [https://github.com/rust-lang/rust/pull/59626 Reduce the `DepNode` pre-allocation ratio.] Reduces peak memory use by 20 MiB on some workloads. | ||
* [https://github.com/rust-lang/rust/pull/60630 Use `Symbol` more.] Up to 1% speed-up, as well as making the code nicer. Should also help with parallel rustc. | * [https://github.com/rust-lang/rust/pull/60630 Use `Symbol` more.] Up to 1% speed-up, as well as making the code nicer. Should also help with parallel rustc. | ||
* [https://github.com/rust-lang/rust/pull/60815 Use `Symbol` even more.] Up to 1% speed-up. Should also help with parallel rustc. | * [https://github.com/rust-lang/rust/pull/60815 Use `Symbol` even more.] Up to 1% speed-up. Should also help with parallel rustc. | ||