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Merged
rust-bors merged 1 commit into from
Jul 9, 2026
+27 −2
Merged

CI job for parallel frontend ui tests #158307

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11 changes: 9 additions & 2 deletions src/ci/docker/host-x86_64/optional-x86_64-gnu-parallel-frontend/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -24,13 +24,20 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
COPY scripts/sccache.sh /scripts/
RUN sh /scripts/sccache.sh

ENV PARALLEL_FRONTEND_THREADS=4
ENV ITERATION_COUNT=2

ENV RUST_CONFIGURE_ARGS \
--build=x86_64-unknown-linux-gnu \
--enable-sanitizers \
--enable-profiler \
--enable-compiler-docs \
Comment on lines 32 to 34

@jieyouxu jieyouxu Jul 8, 2026 •
edited by rustbot
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NB: oh, you could probably save some time (e.g. by not having to build rustdocs for this), though this doesn't really matter much compared to impact of RUST_TEST_THREADS I'd expect. So I'd just leave this in.

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--set llvm.libzstd=true
--set llvm.libzstd=true \
--set rust.parallel-frontend-threads=${PARALLEL_FRONTEND_THREADS}

# Build the toolchain with multiple parallel frontend threads and then run tests
# Tests are still compiled serially at the moment (intended to be changed in follow-ups).
ENV SCRIPT python3 ../x.py --stage 2 test --set rust.parallel-frontend-threads=4
# Running compiletest only tests for parallel frontend, then the rest without compiletest-only
# options (i.e. `--parallel-frontend-threads=4 --iteration-count=2`)
COPY ./scripts/optional-x86_64-gnu-parallel-frontend.sh /scripts/
ENV SCRIPT="Must specify DOCKER_SCRIPT for this image"
16 changes: 16 additions & 0 deletions src/ci/docker/scripts/optional-x86_64-gnu-parallel-frontend.sh
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@@ -0,0 +1,16 @@
#!/usr/bin/env bash

set -eux -o pipefail

if [ ! -v RUST_TEST_THREADS ]; then
RUST_TEST_THREADS_=$(python3 -c "print(max(1, $(nproc) // ${PARALLEL_FRONTEND_THREADS}))")
else
RUST_TEST_THREADS_=${RUST_TEST_THREADS}
fi

RUST_TEST_THREADS=${RUST_TEST_THREADS_} \
python3 ../x.py --stage 2 test \
tests/ui \
-- \
--parallel-frontend-threads="${PARALLEL_FRONTEND_THREADS}" \
--iteration-count="${ITERATION_COUNT}"
2 changes: 2 additions & 0 deletions src/ci/github-actions/jobs.yml
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Expand Up @@ -363,6 +363,8 @@ auto:
- name: optional-x86_64-gnu-parallel-frontend
# This test can be flaky, so do not cancel CI if it fails, for now.
continue_on_error: true
env:
DOCKER_SCRIPT: optional-x86_64-gnu-parallel-frontend.sh
<<: *job-linux-4c

# This job ensures commits landing on nightly still pass the full
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