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Make parallel frontend CI job compile tests in parallel #157705

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Make parallel frontend CI job compile tests in parallel #157705

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Make parallel frontend job run test in parallel
zetanumbers Jun 10, 2026
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zetanumbers Jun 11, 2026
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6 changes: 4 additions & 2 deletions src/ci/docker/host-x86_64/optional-x86_64-gnu-parallel-frontend/Dockerfile
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Expand Up @@ -31,6 +31,8 @@ ENV RUST_CONFIGURE_ARGS \
--enable-compiler-docs \
--set llvm.libzstd=true

# Compile each test sequentially to achieve max thread utilization by a single rustc process
ENV RUST_TEST_THREADS 1

# 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
ENV SCRIPT python3 ../x.py --stage 2 test --set rust.parallel-frontend-threads=4 "--" --parallel-frontend-threads=4 --iteration-count=2
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