Shard macOS unit tests and split E2E tests into three shards - #8297
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Shard macOS unit tests and split E2E tests into three shards#8297isaacroldan wants to merge 2 commits into
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This was referenced Aug 11, 2026
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macOS is the slowest and most variable unit-test runner (4m38s to 15m34s for the same suite in recent runs) and gates the required 'Unit tests' check. Shard it 2x like Windows to halve its wall-clock time.
Shard 1 consistently takes 1.5-2.5x as long as shard 2 (6.5-12m vs 4-5m). A third shard rebalances the file distribution and shortens the E2E chain that the cleanup job waits on.
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WHY are these changes introduced?
Two hotspots from analyzing recent CI runs:
WHAT is this pull request doing?
How to test your changes?
Check this PR's workflow run: all macOS unit shards finish in under ~5 minutes and the three E2E shards land within ~1 minute of each other (two attempts measured: 7m06s and 8m30s total, vs a 9–23m baseline).
🤖 Generated with Claude Code