bfcc7b2acb71ccd7a996800c331df20d6d09b839
3 Commits
| Author | SHA1 | Message | Date | |
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Tom Boucher
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86452da7cb |
fix(#4070): reserve shard 1's aux-suite cost out of the LPT unit-test packer (#4072)
* test(#4070): failing-first regression for shard1 aux-suite budget imbalance - selectShard has no way to reserve virtual weight on a bin, so the LPT unit-test packer cannot account for shard 1's fixed aux-suite cost (integration/security/install/slow all pinned to shard 1/3). - test.yml wires no such reserve into the workflow. - ci-test-job-timeout-budget.test.cjs's LANE_COSTS entry for job `test` was stale (7m12s from run 30677442953, predating the aux-suite growth); corrected to the real evidence cited in #4070 (13m48s / cancelled at ~14m51s), which now honestly fails the file's own 1.5x headroom policy against the current 15-minute cap. All three are expected RED on this commit; see .gsd/bug/fix-4070-shard1-aux-suite-budget/50-test-matrix.md. * fix(#4070): reserve shard 1's aux-suite cost out of the LPT unit-test packer selectShard now accepts an optional initialWeights array giving one or more bins a virtual head start before any file is placed, so LPT converges each bin's FINAL total (assigned weight + head start) toward equal instead of raw assigned weight alone. test.yml wires RUN_TESTS_SHARD_RESERVE=1:77 into the full-scope unit-test step (gated on matrix.scope == 'full', so the unrelated windows lane is unaffected) -- 77 weight units is the empirical conversion of the aux suites' ~220s measured fixed cost, derived against the real tests/test-timings.json (see the diagnosis artifact for the full computation). Also corrects two pieces of now-stale bookkeeping this issue exposed: - ci-test-job-timeout-budget.test.cjs's LANE_COSTS entry for job `test` carried a 7m12s figure that predated the aux-suite growth; corrected to the real pre-fix evidence (13m48s / cancelled at ~14m51s, issue #4070), which requires raising timeout-minutes from 15 to 21 (1.5x headroom over the real worst-case measurement) to satisfy the file's own policy. - test.yml's job-header and matrix comments, which still claimed the aux suites cost "~1m35s combined" (they now measure ~216-224s). Closes the gap the previous commit's failing-first tests proved: selectShard had no reserve-capacity mechanism and test.yml wired none in. * fix(#4070): correct the reserved-weight property bound; cover main()'s reserve bounds check Isolated code review found a genuine gap and gsd-test's real run confirmed a real test bug it exposed: - The fast-check property "no shard exceeds average(+reserve) + heaviest file" was falsified by gsd-test itself (weights=[1,1,1], total=2, reserve=6 on bin 0): selectShard is correct, the BOUND was wrong. A reserve large enough that its bin never receives a real item stays at exactly that reserve forever -- no amount of routing real items elsewhere can dilute a fixed head start below itself -- so the true bound is max(reserve, the classic Graham term), not the Graham term alone. Verified the corrected bound against the exact counterexample plus 20,000 additional random trials (zero violations) before re-running gsd-test. - Isolated review (MAJOR): the shard-total bounds check on RUN_TESTS_SHARD_RESERVE and its console.error fallback in main() were untested end-to-end -- parseShardReserve itself has no concept of the shard total, so only main() enforces that guard, and nothing exercised it through the subprocess seam. Added an E2E harness test that sets RUN_TESTS_SHARD_RESERVE to an out-of-range index via the real CLI, asserts the fallback warning fires, AND asserts the resulting file selection is byte-identical to a no-reserve control run against the same injected timings table -- proving the reserve was actually ignored, not just that a warning printed. * chore(#4070): backfill changeset PR number pr:0 -> pr:4072 * fix(#4070): strip leaked RUN_TESTS_SHARD_RESERVE from the harness test's child env Real GH Actions CI on this PR (run 33288554040, ubuntu shard 2/3) failed 7 tests in the shard-partitioning describe block, all with the same symptom: `run-tests: no tests in suite "all"` where a real file count was expected. gsd-test's own dockerized bench run never showed this, and ubuntu shards 1/3 and 3/3 (which run the same test.yml step) passed clean -- the discrepancy is the tell: only shard 2/3 happened to schedule this specific test FILE for that run, and the outer CI job's own environment is where the leak lives. Root cause: test.yml's "Run unit tests" step now sets RUN_TESTS_SHARD_RESERVE=1:77 (this issue's own reserve mechanism) on the OUTER job that runs `npm run test:coverage:unit:raw -- --shard N`. The harness test file's runHarness() helper spawns run-tests.cjs as a CHILD of that same job via `{...process.env, ...extraEnv}`, so every pre-existing --shard test in this describe block silently inherited the ambient reserve -- even though none of them know it exists. A reserve of 77 weight units utterly dwarfs the ~0.3 total weight of the 9-file synthetic fixtures these tests use (none are in the real timings table, so all fall back to the same tiny median weight), so shard index 1 is routed zero files every time -- exactly the observed "no tests" failures, and exactly the skewed 5/4 split observed on the shard-2 test that expected a plain 3/3/3 round-robin. Reproduced locally end to end (set RUN_TESTS_SHARD_RESERVE=1:77, spawn the old runHarness against a synthetic 9-file fixture, --shard 1/3 -- reproduces the exact "no tests in suite \"all\"" stderr) and confirmed the fix (env stripped unless a test opts in via extraEnv, as the #4070 E2E bounds-check test already does) resolves it, before re-running gsd-test. This is a genuine bug this PR introduced -- a new ambient env var that a pre-existing subprocess-spawning test helper didn't know to isolate against -- not a pre-existing flake and not resource contention. --------- Co-authored-by: sim <sim@local> |
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sim
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5039d49924 |
ci(#3057): shard the scoped Windows lane, the last unsharded one
The scoped Windows lane reached exactly 15m05s and was cancelled on four consecutive shas of PR #3094. A job that exceeds timeout-minutes reports as CANCELLED rather than FAILURE, which is why it first read as infrastructure noise; the giveaway is that the duration equals the cap. The Required tests rollup fans that job in, so it red-blocked merge while every other lane — including all three sharded full-Windows shards — was green. The trigger was a change to the shared test helper, which scopes the install-heavy suites into the selected list. The lane normally runs about eight minutes; with that list it does not fit. It was the only unsharded lane left in this job, so it was the only one without headroom to absorb a large scoped list. Issue #869 hit this exact cliff on the sibling lane and named the durable answer in its own follow-up: a timeout bump moves the cliff, sharding removes it. #2952 then sharded the full lane. This finishes that work. The runner already supports it — the shard partition is applied after scope selection, so it composes with a selected file list rather than only with a suite, and the partition is cost-weighted from the measured timings table. The job name template already renders a shard suffix when one is present, so the three entries name themselves. No individual matrix job is a required status check; the rollup is, and it is name-independent, so renaming these jobs does not touch branch protection. timeout-minutes stays at 15. Each shard now does roughly a third of the work, so the cap goes from binding to backstop without being raised. The lane-shape tests were generalized rather than relaxed: the complete-shard-set invariant now runs per sharded scope instead of only over the full lane, and "only the full lane is sharded" became "targeted is the only unsharded lane". A new assertion pins the shard through to the runner — without it the three shards would each run the entire selected list, triple the cost and no speedup, and every check would stay green. No LANE_COSTS entry is added for the new shards. The only recorded cost for that lane is the pre-sharding run that hit the cap, and inventing a post-sharding number would be exactly the kind of unmeasured claim the rest of that table avoids. The estimate and the reason are written down instead, to be replaced by a real measurement. Refs #3057 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> |
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Tom Boucher
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f6257f3745 |
ci(#2952): shard the full test lane instead of widening its cap (#2960)
* ci(#2952): budget CI job timeouts by headroom over measured cost `origin/next` was red. The only failing check was `Required tests`, and its sole cause was `test (ubuntu-latest, 24)` reported `cancelled` — GitHub's conclusion for a job that exceeds its `timeout-minutes`, not a button press. That job's `ubuntu-latest / 24` entry is the only `scope: full` matrix entry: it runs the whole unit suite under c8 coverage, then the scripts/ coverage floor, integration, security, install and slow, serially on one runner. On next@5a0a9f097 it ran 15m16s against `timeout-minutes: 15` and was axed 23s into `npm run test:slow`. Projected to a completed slow step (27s on the last green run) the lane costs ~15m20s. Confirmed hypothesis: the budget, not the suite. The lane had been riding the ceiling all day — 12m03s, 11m34s, 11m50s, 14m25s, 14m51s — and crossed on three of the last four full-lane runs ( |