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ci: qualify test files for the parallel bucket per file, not per directory - #39236
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…ctory The parallel allowlist listed a directory only when two thirds of its files were fast and never flaky, so a slow or flaky neighbour kept whole directories in the one-at-a-time phase. On a macOS shard that phase is 9.6 of 13.5 minutes, and 241 of its 389 files are fast and clean on their own. update-parallel-allowlist.mjs now qualifies each file by itself (same fast + never-flaky-or-failed test as before), lists every directory that has a qualifying file, and puts the rest of that directory in excludeFiles, so the JSON shape and runner.node.mjs are unchanged. It also checks the slowest lane in expected-durations.json rather than only the Linux median, so a file that is quick on Linux but slow on Windows or ASAN does not hold a bucket slot for its whole run. Regenerated from the last 300 finished PR builds (#97649..#98676): 1744 files eligible (was 1296), 286 dirs (was 215), 242 excluded. No-Verification-Needed: generator + regenerated data; effect is measured by the next builds' parallel-bucket timings and flaky annotations
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WalkthroughChangesThe allowlist generator now uses the slowest available lane duration for each test file, excludes most shared-state Parallel allowlist
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LGTM — CI-tooling-only change to the allowlist generator plus the regenerated data file.
What was reviewed
- Generator logic:
DIR_MIN_FRACTIONthreshold replaced withgood.length === 0gate;slowest()correctly falls back toundefinedwhen the file has no entry or no numeric lane values. - Confirmed
runner.node.mjsstill reads only{dirs, excludeFiles}as sets and matches bydirname, so the JSON shape change is nil. - Checked
test/internal/parallel-allowlist.test.tsinvariants (dirs > 100, every excludeFile's dir is listed) hold against the new data.
Extended reasoning...
Overview
Two files: the maintainer script scripts/update-parallel-allowlist.mjs (drops the 2/3-of-directory qualification threshold in favour of per-file qualification, and switches the "fast" check from the .default lane to the max across all numeric lanes in expected-durations.json) and the regenerated test/parallel-allowlist.json it produces. No runtime, bundler, or test-runner code is touched.
Security risks
None. This is an offline script run by a maintainer with a BuildKite token to regenerate a static JSON file; the JSON is consumed by scripts/runner.node.mjs in CI to decide which test files go into the bun test --parallel batch vs the serial phase. No user input, no auth/crypto, no shipped code.
Level of scrutiny
Low. The blast radius is CI test scheduling. The existing safety net is unchanged: any file that fails in the parallel batch is re-run alone, and a pass-on-retry produces a flaky annotation that demotes it at the next regen. So an over-permissive allowlist self-corrects rather than masking failures. I verified the consumer (isParallelAllowlisted in runner.node.mjs:394-400) reads exactly dirs.has(dirname) && !excludeFiles.has(path), which the new generator still satisfies, and that test/internal/parallel-allowlist.test.ts will still pass on the new shape (286 dirs > 100; every excludeFiles entry's dirname is in dirs by construction).
Other factors
The slowest() helper handles the edge cases the old .default lookup did: missing entry → undefined → treated as fast (same as before), and an entry with no numeric values → undefined. The dead DIR_MIN_FRACTION constant is deleted in the same commit. The _meta.rule string is updated to describe the new behaviour. Minor: the PR description cites build range #97649..#98676 while the JSON records [97649, 97948] — a description typo, not a code issue.
…/cache dirs) Build 98780 promoted 77 cli/install files into the parallel batch and ~25 of them raced on linking into the shared user bin dir (Failed to link which/nopt/node-gyp/glob/semver: EEXIST); each passed on the serial re-run, so the batch cost more than it saved. cli/install (except the pure hosted-git-info and migration dirs) now never qualifies, like docker-service and stress tests. Regenerated: 1694 files eligible, 285 dirs, 215 excluded. No-Verification-Needed: generator rule + regenerated data; judged by the PR's build
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Inline comments:
In `@scripts/update-parallel-allowlist.mjs`:
- Line 181: Update the generated rule text in
scripts/update-parallel-allowlist.mjs at lines 181-181 to state that only
non-exempt cli/install tests never qualify, while preserving the listed
hosted-git-info and migration exemptions. Then regenerate
test/parallel-allowlist.json at lines 3-8 so its metadata reflects the corrected
rule.
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…e text No-Verification-Needed: comment/metadata text only
…rough the shared bin) Build 98828: the napi prebuild builds 29 addons with bun install + node-gyp; run for the batch they raced on linking nopt/which/node-gyp into the shared bin (EEXIST), a few addons failed to build, their tests failed in the batch and passed on the serial re-run. napi/ now never qualifies, like cli/install. Regenerated: 1613 files eligible. No-Verification-Needed: generator rule + regenerated data; judged by the PR's build
…ns concurrently Up to 8 addon builds run bun x node-gyp@11 at the same time. On a fresh runner (every Tart guest) the first use installs node-gyp into the shared bunx cache and links its bin dependencies (nopt, which, glob, semver) into the shared bin dir; done concurrently those links race (EEXIST), a few addon builds fail, and their tests then fail in the parallel batch and pass on the serial re-run (build 98828/98859). prebuild.ts now runs bun x node-gyp@11 --version once, serially, before the parallel loop; every concurrent bun x after that is a cache hit with nothing to link. With the race gone at its source, the previous commit's napi bucket exclusion is dropped again: napi tests qualify on their own merits like everything else. No-Verification-Needed: judged by the PR's build (EEXIST count in the napi prebuild group)
…ker-service tests prestart-map.mjs is a hint list for the shard-level service prestart, not every test that talks to a container, so js/sql files outside its prefixes (sql-statement-cache-hash-collision, postgres-prepared- pipeline-reorder) were bucketed and contended for the shared service: the former failed in the batch and passed alone in builds 98828 and 98859. Any file calling describeWithContainer( now never qualifies. No-Verification-Needed: generator rule + regenerated data
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Moving cron.test.ts into the batch surfaced a test-isolation problem in its Linux suites on the Ubuntu lanes (an interrupted run leaves an entry in the real crontab that fails every retry); fix in #39342. |
…e-exclude streams-leak scripts/update-parallel-allowlist.mjs rebuilds excludeFiles from scratch from flake annotations in the scanned build window. A file that is already excluded runs serially, produces no annotation, and so is dropped on the next regen, then flakes once re-included. #36585 dropped inspect-error-leak this way (flaked on nearly every build from 86456 until the #39236 regen re-excluded it); #39236 in turn dropped streams-leak, which has flaked in the parallel batch on every macOS lane of every main build since (98887 onward). Add a guard in test/internal/parallel-allowlist.test.ts listing the tests that assert on in-process rss()/heapStats() and so cannot be batch-safe; a regen that drops one of them fails there, naming the file. Re-add streams-leak to excludeFiles so the guard passes on this tree.
…per directory (#39236)" (#39369) Reverts #39236. Since it merged, main builds show 46-63 "failed in the parallel batch; passed alone" occurrences per build (21-36 distinct files), against 1-11 (5-11 files) per build before it. Builds stay green because each such file is re-run alone, but that is ~10x the batch-flake noise and each one costs a serial re-run, so the shard-time win is partly eaten and the flaky annotations drown real signal (raised by @dylan-conway). Root cause: the per-file rule promoted ~400 files that had never run in a batch before, so the 300-build "never flaky" check had no batch history for them and could not predict order/concurrency sensitivity. Files that turned out to be batch-sensitive were only visible after promotion. Plan for the re-land: promote in small batches with a soak (one PR per directory group, watch batch-flake annotations for a day, keep or demote), rather than all at once from history alone. The generator changes and the napi node-gyp cache warm from #39236 will come back with that.
scripts/update-parallel-allowlist.mjs rebuilds excludeFiles from scratch from the flake annotations in its scan window. A file that is already excluded runs serially, never produces a batch annotation, and so is dropped by the next regen, then flakes once it is back in the batch. #36585 dropped inspect-error-leak and sourcetextmodule-leak this way and both have flaked in the batch on most builds since (x64-asan timeouts, Windows worker exit 9); #39236 re-excluded them, dropped streams-leak instead, and has now been reverted (#39369), putting the first two back in the batch. Add a guard in test/internal/parallel-allowlist.test.ts listing the dedicated leak tests that assert on rss()/heapStats() inside the test process; a regen that drops one of them fails there naming the file. Re-add the three pinned files that the current table runs in the batch (inspect-error-leak, sourcetextmodule-leak, zlib/leak) so the guard passes on this tree.
#39236 promoted ~400 files that had never run in the parallel batch, and main builds then showed 46-63 'failed in the parallel batch; passed alone' occurrences per build (was 1-11), so it was reverted (#39369). History-based promotion cannot see batch sensitivity for files with no batch history; this re-lands #39236 with what the batch itself taught us: test/parallel-denylist.txt lists the 223 files that failed in the batch and passed alone across the 413 builds since (98887..99420), the generator never qualifies a denylisted file (and can extend the list from annotations with --denylist-from-annotations), and the allowlist is regenerated. 97 of the 223 were in the batch before #39236 too, so batch flakiness should end below its old level. No-Verification-Needed: generator rule + data files; judged by the flaky annotations on the next main builds
…file that has failed in the batch (#39373) Re-lands #39236 (reverted in #39369) with the fix @dylan-conway suggested: keep the mechanism, keep out every file the batch itself has shown to be batch-sensitive. **Why #39236 was noisy.** It promoted ~400 files that had never run in the parallel batch, so the 300-build "never flaky" history could not see batch sensitivity for them. Main builds then showed **46-63 "failed in the parallel batch; passed alone" occurrences per build (21-36 files)**, against 1-11 before. Builds stayed green (each such file is re-run alone) but the noise drowned real flake signal and each re-run cost time. **What this PR is**, two commits on top of the reverted main: 1. `Reapply #39236`: per-file qualification, slowest-lane duration check, `cli/install` and `describeWithContainer` exclusions, and the napi prebuild `bunx node-gyp` cache warm. 2. The denylist. Scanning the 413 builds since #39236 (#98887..#99420) for the "in the parallel batch" annotation gives **223 distinct files** that failed in the batch and passed alone; the top ones do it in ~70% of builds (`cli/run/env.test.ts`, `js/bun/spawn/spawn-streaming-stdin.test.ts`, `js/bun/net/socket-retention.test.ts`, `js/web/streams/streams-leak.test.ts`, `js/node/process/process-on.test.ts`, …): env/spawn/process-wide-state and leak-counter tests that cannot share a process pool. - `test/parallel-denylist.txt`: those 223 files, one per line. Only ever grows by evidence. - `scripts/update-parallel-allowlist.mjs`: a denylisted file never qualifies, regardless of history; `--denylist-from-annotations` appends any file whose flaky annotation in the scanned builds says "in the parallel batch", so future regens keep learning from the batch. - `test/parallel-allowlist.json` regenerated: **1518 eligible** vs 1340 on main today (+316 promoted, −138 demoted). 97 of the demoted were batch-flaking *before* #39236 too, so batch flakiness should land below its old level, not just back to it. Verification: the "in the parallel batch" flaky annotation count on the next main builds; target single digits per build. If it does not come down, revert this one.
Since #36175 each shard runs the files in
test/parallel-allowlist.jsonas onebun test --parallelbatch and everything else one at a time. On a macOS shard that one-at-a-time phase is 9.6 of 13.5 minutes (389 files). Classifying those 389 against the allowlist rules: 241 of them (2.3 min) are fast and never flaky on their own and were kept serial only because the generator listed a directory just when two thirds of it qualified, so one slow or flaky neighbour held back whole directories.scripts/update-parallel-allowlist.mjsexcludeFiles, so the JSON shape andrunner.node.mjsare unchanged.expected-durations.json, not only the Linux median, so a file that is quick on Linux but slow on Windows or ASAN does not hold a bucket slot for its whole run.test/parallel-allowlist.jsonregenerated from the last 300 finished PR builds (#97649..#98676): 1744 files eligible (was 1296), 286 dirs (was 215), 242 excluded (was 160). Dirs +84 −13; the 13 dropped are single-file napi/comlink dirs whose only file flaked in the fresh window (same rule, newer data).Expected effect: ~2 min less serial time per macOS shard (~17%), similar on the Linux lanes, no test skipped. Safety net is unchanged: a file that fails in the batch is re-run alone, and if it then passes it gets the
flakyannotation ("in the parallel batch … passed alone"), which demotes it at the next regen.What stays serial on that macOS shard after this, for context: 33 files >15s on some lane (4.6 min:
js/web/fetch/body-stream,fetch.test,bake/dev/*,expo,cron, …), 41 recently-flaky files (2.0 min), 42 node-test/stress/docker files (0.4 min). Those need per-file work (splitting the slow ones, deflaking), not allowlisting.