Low Level Tools/2019Q2: Difference between revisions
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== Nick == | == Nick == | ||
[https://github.com/rust-lang/rust/issues/58465 rustc pipelining] | === [https://github.com/rust-lang/rust/issues/58465 rustc pipelining] === | ||
Implement "pipelined" rustc compilation (compiler side). | |||
* 100% completed. | |||
* [https://github.com/rust-lang/rust/pull/60190 Don't generate unnecessary rmeta files.] A precursor. | * [https://github.com/rust-lang/rust/pull/60190 Don't generate unnecessary rmeta files.] A precursor. | ||
* [https://github.com/rust-lang/rust/pull/60006 In JSON output, emit a directive after metadata is generated.] The part that lets rustc tell Cargo when metadata has been written. | * [https://github.com/rust-lang/rust/pull/60006 In JSON output, emit a directive after metadata is generated.] The part that lets rustc tell Cargo when metadata has been written. | ||
* [https://github.com/rust-lang/rust/pull/60385 Emit metadata files earlier.] So that significant crate overlapping can occur. | |||
* [https://github.com/rust-lang/rust/issues/60988 Tracking issue for stabilizing "pipelined compilation"] has been opened. | |||
* [https://groups.google.com/forum/#!topic/mozilla.dev.platform/bXB5QxAV-fE Announcement email to dev-platform] | |||
* Speed-ups depend on program structure and configuration, but up to 1.84x has been observed. | |||
* Speedups for opt builds of notable projects on my 14-core Linux box: | |||
** webrender: 1.27x | |||
** cranelift-codegen: 1.20x | |||
** Firefox: 1.07x | |||
** script-servo: 1.07x | |||
** style-servo: 1.06x | |||
Ship GWP. | === Ship GWP === | ||
Ship GWP in Nightly. | |||
* Renamed it PHC (Probabilistic Heap Checker). | |||
* Landed prerequisites: {{Bug|1558365}}, {{Bug|1557907}}. | |||
=== rustc perf === | |||
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. | ||
* 100%+ completed. | |||
* [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% speed-up on packed-simd, up to 3% on numerous others. | |||
* [https://github.com/rust-lang/rust/pull/61612 Special-case literals in `parse_bottom_expr`]. Up to 7% win on programs with large constants. | |||
* [https://github.com/rust-lang/rust/pull/61484 Avoid more hygiene lookups.] Up to 2% speed-up on many benchmarks. | |||
* [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. | |||
Latest revision as of 02:10, 14 June 2019
Nick
rustc pipelining
Implement "pipelined" rustc compilation (compiler side).
- 100% completed.
- Don't generate unnecessary rmeta files. A precursor.
- In JSON output, emit a directive after metadata is generated. The part that lets rustc tell Cargo when metadata has been written.
- Emit metadata files earlier. So that significant crate overlapping can occur.
- Tracking issue for stabilizing "pipelined compilation" has been opened.
- Announcement email to dev-platform
- Speed-ups depend on program structure and configuration, but up to 1.84x has been observed.
- Speedups for opt builds of notable projects on my 14-core Linux box:
- webrender: 1.27x
- cranelift-codegen: 1.20x
- Firefox: 1.07x
- script-servo: 1.07x
- style-servo: 1.06x
Ship GWP
Ship GWP in Nightly.
- Renamed it PHC (Probabilistic Heap Checker).
- Landed prerequisites: bug 1558365, bug 1557907.
rustc perf
Land 5 changes that speed up or reduce peak memory usage of rustc.
- 100%+ completed.
- Increase `Span` from 4 bytes to 8 bytes. A big win across lots of workloads, especially larger crates: some script-servo builds are 15% faster.
- Avoid `hygiene_data` lookups. Up to 10% speed-up on packed-simd, up to 3% on numerous others.
- Special-case literals in `parse_bottom_expr`. Up to 7% win on programs with large constants.
- Avoid more hygiene lookups. Up to 2% speed-up on many benchmarks.
- Reduce the `DepNode` pre-allocation ratio. Reduces peak memory use by 20 MiB on some workloads.
- Use `Symbol` more. Up to 1% speed-up, as well as making the code nicer. Should also help with parallel rustc.
- Use `Symbol` even more. Up to 1% speed-up. Should also help with parallel rustc.