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Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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Jul 10, 2026

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Use PGO for rustdoc
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Use PGO for rustdoc

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Jul 11, 2026

Use PGO for rustdoc
try-job: dist-x86_64-linux

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Jul 15, 2026

Use PGO for rustdoc
try-job: dist-x86_64-msvc
try-job: dist-x86_64-linux

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July 18, 2026 06:21

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Jul 19, 2026

Use PGO for rustdoc
This PR extends the recently added support for configuring PGO options per component in bootstrap to support `rustdoc` and enables PGO training on `Doc` benchmarks.
We build PGO-instrumented rustc and rustdoc together.
I tested two variants:
- Run all rustc benchmarks *also* on `Doc` rustc-perf profiles, and then use the same merged PGO profile to optimize both rustc and rustdoc
  - rust-lang/rust#159091 (comment)
- Run rustc benchmarks separately, and generate the rustc PGO profile from that, same as before. Then run *only* `Doc` benchmarks, and generate a rustdoc PGO profile from that, and use that to optimize rustdoc (note that here we run the `Doc` benchmarks using a PGO instrumented rustc too, so the profiles will include PGO data from librustc_driver.so).
  - rust-lang/rust#159091 (comment)
I think that the second reason is slightly better, and produces better results (and less rustc regressions).
Gathering the rustdoc PGO profiles takes barely over a minute, I don't think that this should have a large effect on the duration of the `dist-x86_64-linux` job.
try-job: dist-x86_64-msvc
try-job: dist-x86_64-linux

github-actions Bot pushed a commit to rust-lang/rustc-dev-guide that referenced this pull request

Jul 20, 2026

Use PGO for rustdoc
This PR extends the recently added support for configuring PGO options per component in bootstrap to support `rustdoc` and enables PGO training on `Doc` benchmarks.
We build PGO-instrumented rustc and rustdoc together.
I tested two variants:
- Run all rustc benchmarks *also* on `Doc` rustc-perf profiles, and then use the same merged PGO profile to optimize both rustc and rustdoc
  - rust-lang/rust#159091 (comment)
- Run rustc benchmarks separately, and generate the rustc PGO profile from that, same as before. Then run *only* `Doc` benchmarks, and generate a rustdoc PGO profile from that, and use that to optimize rustdoc (note that here we run the `Doc` benchmarks using a PGO instrumented rustc too, so the profiles will include PGO data from librustc_driver.so).
  - rust-lang/rust#159091 (comment)
I think that the second reason is slightly better, and produces better results (and less rustc regressions).
Gathering the rustdoc PGO profiles takes barely over a minute, I don't think that this should have a large effect on the duration of the `dist-x86_64-linux` job.
try-job: dist-x86_64-msvc
try-job: dist-x86_64-linux

Open