Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust

Kobzol · 2026-03-11T16:35:43Z

Discussed on Zulip.

Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).

r? @jieyouxu

Kobzol · 2026-03-11T16:38:30Z

@bors try jobs=x86_64-gnu-parallel-frontend

Add optional CI job to run tests with the parallel frontend try-job: x86_64-gnu-parallel-frontend

rust-bors · 2026-03-11T19:28:17Z

☀️ Try build successful (CI)
Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)

jieyouxu

General idea seems good, some clarifications
@rustbot author

View changes since this review

src/ci/citool/src/jobs.rs

src/ci/docker/host-x86_64/x86_64-gnu-parallel-frontend/Dockerfile

…hreads

Kobzol · 2026-03-12T08:09:19Z

Updated docs and adopted the optional- naming convention.

jieyouxu

Thanks, r=me with one doc nit (I forgot to mention)

View changes since this review

src/ci/citool/src/jobs.rs

rustbot · 2026-03-12T08:36:03Z

The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.

cc @BoxyUwU, @tshepang

Kobzol · 2026-03-12T08:36:23Z

@bors r=jieyouxu

rust-bors · 2026-03-12T08:36:26Z

📌 Commit b3333b3 has been approved by jieyouxu

It is now in the queue for this repository.

@jieyouxu

…ional, r=jieyouxu Add optional CI job to build the compiler with the parallel frontend Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794). Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place). r? @jieyouxu

Rollup of 11 pull requests Successful merges: - #153726 (Add optional CI job to build the compiler with the parallel frontend) - #153763 (Don't add empty target features for target-cpu=native on macOS) - #153432 (Fix some comments about dataflow analysis.) - #153529 (Fix LegacyKeyValueFormat report from docker build: pr) - #153694 (fix(query): Pass Query Key to `value_from_cycle_error`) - #153708 (de-non_const `Iterator` trait methods) - #153717 (unused_macro_rules switched used and unused comments) - #153736 (add test that an incomplete feature emits a warning) - #153748 (editorconfig: css uses tabs) - #153750 (rustc-dev-guide subtree update) - #153762 (actually make the is-fn test test what it says it tests)

rust-bors · 2026-03-12T11:19:41Z

⌛ Testing commit b3333b3 with merge dc9c2eb...

Workflow: https://github.com/rust-lang/rust/actions/runs/22999418572

@jieyouxu

…eyouxu Add optional CI job to build the compiler with the parallel frontend Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794). Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place). r? @jieyouxu

@jieyouxu

…ional, r=jieyouxu Add optional CI job to build the compiler with the parallel frontend Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794). Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place). r? @jieyouxu

JonathanBrouwer · 2026-03-12T11:32:30Z

@bors yield
Yielding to enclosing rollup

rust-bors · 2026-03-12T11:32:34Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/22999418572

The next pull request likely to be tested is #153770.

…uwer Rollup of 10 pull requests Successful merges: - #153726 (Add optional CI job to build the compiler with the parallel frontend) - #153763 (Don't add empty target features for target-cpu=native on macOS) - #153432 (Fix some comments about dataflow analysis.) - #153529 (Fix LegacyKeyValueFormat report from docker build: pr) - #153694 (fix(query): Pass Query Key to `value_from_cycle_error`) - #153717 (unused_macro_rules switched used and unused comments) - #153736 (add test that an incomplete feature emits a warning) - #153748 (editorconfig: css uses tabs) - #153750 (rustc-dev-guide subtree update) - #153762 (actually make the is-fn test test what it says it tests)

Zalathar · 2026-03-12T11:32:45Z

@bors yield (enclosing rollup)

rust-bors · 2026-03-12T11:32:48Z

❗ There is currently no auto build in progress on this PR.

petrochenkov · 2026-03-12T11:52:50Z

if we see that this new job works well

Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.

rustbot assigned jieyouxu Mar 11, 2026

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rust-bors bot pushed a commit that referenced this pull request Mar 11, 2026

Auto merge of #153726 - Kobzol:parallel-frontend-tests-optional, r=<try>

84afa72

Add optional CI job to run tests with the parallel frontend try-job: x86_64-gnu-parallel-frontend

Kobzol changed the title ~~Add optional CI job to run tests with the parallel frontend~~ Add optional CI job to build the compiler with the parallel frontend Mar 11, 2026

jieyouxu reviewed Mar 12, 2026

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src/ci/citool/src/jobs.rs Show resolved Hide resolved

src/ci/docker/host-x86_64/x86_64-gnu-parallel-frontend/Dockerfile Outdated Show resolved Hide resolved

rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 12, 2026

Allow auto jobs to be non-blocking

ac062fd

Kobzol force-pushed the parallel-frontend-tests-optional branch from 3a48d69 to 5ac0eed Compare March 12, 2026 08:08

Add new CI job that runs tests with a toolchain built with multiple t…

96e4833

…hreads

Kobzol force-pushed the parallel-frontend-tests-optional branch from 5ac0eed to 96e4833 Compare March 12, 2026 08:09

jieyouxu approved these changes Mar 12, 2026

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src/ci/citool/src/jobs.rs Show resolved Hide resolved

Document optional auto jobs in the rustc-dev-guide

b3333b3

rustbot added the A-rustc-dev-guide Area: rustc-dev-guide label Mar 12, 2026

rust-bors bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Mar 12, 2026

Zalathar mentioned this pull request Mar 12, 2026

Rollup of 11 pull requests #153767

Closed

JonathanBrouwer mentioned this pull request Mar 12, 2026

Rollup of 10 pull requests #153770

Merged

Zalathar mentioned this pull request Mar 12, 2026

Rollup of 10 pull requests #153771

Closed

rust-bors bot merged commit 305778c into rust-lang:main Mar 12, 2026
11 of 12 checks passed

rustbot added this to the 1.96.0 milestone Mar 12, 2026

Kobzol deleted the parallel-frontend-tests-optional branch March 12, 2026 15:31

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