perf(ci): run tests in parallel via pytest-xdist - #45
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The test job ran serially (13m44s on ubuntu). pytest-xdist -n auto cuts the local suite from 197s to 71s (x2.76 on 12 cores); CI runners have 4 cores, so the job time drops proportionally. Both OSes keep the exact same test command, so coverage of ubuntu+windows is unchanged. Coverage moves to .coveragerc.ci (COVERAGE_RCFILE): the local .coveragerc sets dynamic_context=test_function, which pytest-cov rejects under xdist (DistCovError, pytest-cov#604) and which costs ~+13.6% (sys.settrace, AGENT_DIARY 2026-09-15). CI only needs the % gate, so it uses the context-free config; local and bootstrap runs keep contexts. Also cache the temporal facts generator per module (36.6s -> 20.8s): the three tests share one deterministic dataset but each re-ran generate(), which spawns dozens of git subprocesses. Measured locally (12 cores): serial 197.1s -> xdist 71.4s (no cov) -> xdist + ci-cov 86.4s; 1865 passed, coverage 54.58% (> 38% gate).
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This was referenced Sep 26, 2026
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What
The CI test job ran serially (ubuntu 13m44s, windows 16m34s). It now runs
pytest-xdistwith-n auto.Measurement (local, 12 cores, 1865 tests)
-n auto(no cov)-n auto+ coverage (CI shape)All green:
1865 passed, 5 skipped, coverage 54.58% (gate 38%).Quality preserved
-n autoonly parallelizes; no marker exclusions, no--exitfirst, no sharding.Coverage config
The local
.coveragercsetsdynamic_context=test_function(per-test contexts used by the bootstrap pipeline), which pytest-cov rejects under xdist (DistCovError, pytest-cov#604) and which costs ~+13.6% (sys.settrace, AGENT_DIARY 2026-09-15). CI only needs the--cov-fail-undergate, so it now uses the shipped context-free.coveragerc.civiaCOVERAGE_RCFILE. Local/bootstrap runs keep.coveragerc(still gitignored).Also
tests/test_temporal_facts_generator.py: the three tests shared one deterministic dataset but each re-rangenerate(seed=7)(dozens of git subprocesses). A module-scoped fixture cuts it 36.6s -> 20.8s.test_deterministic_generationstill callsgeneratetwice on purpose.Deps
pytest-xdist>=3.5.0to thedevextra.