ci(checks): bump nox shards to 4 and introduce shard weights#226
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Abhijeet Prasad (AbhiPrasad) merged 9 commits intomainfrom Apr 8, 2026
Merged
ci(checks): bump nox shards to 4 and introduce shard weights#226Abhijeet Prasad (AbhiPrasad) merged 9 commits intomainfrom
Abhijeet Prasad (AbhiPrasad) merged 9 commits intomainfrom
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Extract the shared checkout, mise setup, and dependency install steps from the smoke and nox jobs into a reusable composite action at .github/actions/setup-python-env. Increase nox test shards from 2 to 4 for faster parallel execution.
Local composite actions require the repo to be checked out first. Move actions/checkout back into each job, before the composite action reference.
Replace the round-robin (NR % TOTAL) shard assignment with a greedy longest-processing-time-first bin-packing algorithm. Session weights are read from py/scripts/session-weights.json (measured from CI). This brings the 4-shard split from a potential ~60s imbalance to within ~3s.
Replace py/scripts/nox-matrix.sh with py/scripts/nox-matrix.py. The Python version is cleaner and avoids the inline Python heredoc that the shell script was already using for the LPT bin-packing logic. Update the workflow to call the new script.
Add --output-durations flag to nox-matrix.py to capture actual session runtimes from nox output. A new non-blocking check-session-weights job runs after nox, compares measured durations against session-weights.json, and warns when any session drifts beyond 50%. The job is deliberately excluded from checks-passed so it never blocks PRs.
Adds a simple workflow for updating stale weights: download the
measured-durations artifacts from a CI run, then run:
python py/scripts/check-session-weights.py --update measured-*.json
This overwrites session-weights.json with the measured values, adds new
sessions, and preserves sessions that were not measured in this run.
Remove the --output-durations capture and check-session-weights job from the checks workflow. Add a new update-session-weights workflow that runs weekly (Monday 06:00 UTC) or on manual dispatch. It measures all nox session durations on ubuntu/3.13, checks for drift, and opens a PR updating session-weights.json when any session drifts beyond 50%.
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Extract the shared checkout, mise setup, and dependency install steps from the smoke and nox jobs into a reusable composite action at .github/actions/setup-python-env. Increase nox test shards from 2 to 4 for faster parallel execution and introduce shard weights so the shard sessions are more balanced.