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ci: split Vitest across six shards so 3/4 stops hitting the job cap #2571

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Merged
matt2e merged 1 commit into from
Nov 5, 2026
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ci: split Vitest across six shards so 3/4 stops hitting the job cap #2571

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9 changes: 6 additions & 3 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -21,13 +21,16 @@ env:
jobs:
javascript:
if: github.event_name != 'workflow_dispatch'
name: JavaScript (${{ matrix.shard }}/4)
name: JavaScript (${{ matrix.shard }}/6)
runs-on: ubuntu-24.04
# Vitest shards by path hash and equal file count, not duration, so slow
# files can share one. Six keeps the slowest well inside this deadline on
# slower runners; five barely moves it, and seven is slower than six.
timeout-minutes: 10
strategy:
fail-fast: false
matrix:
shard: [1, 2, 3, 4]
shard: [1, 2, 3, 4, 5, 6]
steps:
- uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
with:
Expand All @@ -42,7 +45,7 @@ jobs:
env:
# Bound contention between suites that sign and verify large fixtures.
BUZZ_TEST_WORKERS: "2"
run: ./bin/node scripts/ci-test-report.mjs kind=vitest report=test-results/ci/vitest.json evidence=test-results/ci/vitest-timing.json title="Vitest shard ${{ matrix.shard }}/4" -- ./bin/pnpm exec vitest run --shard=${{ matrix.shard }}/4 --reporter=default --reporter=json --outputFile=test-results/ci/vitest.json
run: ./bin/node scripts/ci-test-report.mjs kind=vitest report=test-results/ci/vitest.json evidence=test-results/ci/vitest-timing.json title="Vitest shard ${{ matrix.shard }}/6" -- ./bin/pnpm exec vitest run --shard=${{ matrix.shard }}/6 --reporter=default --reporter=json --outputFile=test-results/ci/vitest.json
- name: Vitest timing evidence
if: always()
uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
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