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…t 1 on a build with no test timings `bun run ci:slowest` printed an empty report and exited 0 for a build in which no test-bun job ran. The auto-pick took such a build because it read only the state of the build. The download asked for the log of every test-bun job, and a job that never started has an empty log. - `jobCoverage` is the one rule for which jobs have timings: a test-bun job counts only if it has a `started_at`. - `findBuild` is the auto-pick. It takes the first finished build in which every test-bun job started and passes over the others. It returns the job list that `bk build list` gave, so that path needs no `bk build view`. A `bk build list` that fails is reported with its error. - The script exits 1 with nothing on stdout when no test-bun job of the build started (before any download) and when the logs name no test file. - With a build number, a `warning:` names the platforms whose jobs never started.
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Updated 2:48 PM PT - Oct 20th, 2026
✅ @robobun, your commit 01299b48fa138750c61b7f549a4011c8defe9864 passed in 🧪 To try this PR locally: bunx bun-pr 46013That installs a local version of the PR into your bun-46013 --bun |
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Status Reproduced on main (ad4089b): With this PR the same command prints nothing on stdout, makes 0 log requests, and exits 1 with PR: #46013 |
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughThe script now selects finished builds with complete test-job start coverage. It reports timings from started jobs, warns about jobs that did not start, and exits with status 1 when it cannot produce test-file timings. Tests cover build discovery, coverage, and reporting outcomes. ChangesSlowest test build workflow
Priority: ⬇️ Low Merge Risk: ⚪ Minimal · up to
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The description clearly explains the problem, fix, behavior changes, verification, scope limits, and known downside. It does not use the exact template headings, but it provides the required informati… |
| Title check | |
The title clearly summarizes the main changes: selecting builds where every test-bun job started and exiting with status 1 when no test timings exist. |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
Full details: Description check
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Explanation
The description clearly explains the problem, fix, behavior changes, verification, scope limits, and known downside. It does not use the exact template headings, but it provides the required information in equivalent sections.
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Inline comments:
Review comments at @test/internal/ci-slowest-tests.test.ts:
- Around line 378-380: Remove the explicit timeout arguments from all eight
test.concurrent calls in the spawn suite, and update the adjacent comment to
remove the reference to timeouts while preserving the Windows skip and slow
debug-build context.
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📒 Files selected for processing: 3
.claude/skills/slowest-tests/SKILL.mdscripts/ci-slowest-tests.tstest/internal/ci-slowest-tests.test.ts
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…lowest-skip-untested-builds
…AN builds The eight spawn tests each passed a 30 s timeout. CI already gives every test 90 s (270 s on ASAN), so the explicit value only lowered that. Without the value, a debug build hit the default 5 s timeout in 2 of 4 runs: eight ASAN processes that start at the same time take 4 to 6.5 s each. The tests now use `test.concurrentIf(!isASAN)`. On an ASAN build each runs alone and takes 0.6 to 1.2 s.
Problem
bun scripts/ci-slowest-tests.ts 127137 --jsonprints{"build":"127137","count":0,"top":[]}and exits 0. No test-bun job (one test shard) ran in that build.scripts/ci-slowest-tests.ts:105). The job filter (:127) never readsstarted_at, so it downloads 160 empty logs.Fix
jobCoverage: a test-bun job counts only with astarted_at. The script requests no other log.findBuildpicks the first finished build in which every test-bun job started, and reuses its jobs frombk build list(nobk build view).test/internal/ci-slowest-tests.test.ts(14 new tests fail on main). Self-reviewed: 10 concerns raised, 9 addressed. Not done: an issue for failed log downloads (ci:slowest: retry rate-limited log downloads and report missing logs #42712).Background
warning:names those platforms.Downsides
bk build listcalls: mean 2.27 per run, was 1.38.Notes
The rule, and a build in which only some platforms ran
started_at). The test is notfinished_atorstate: a job killed mid-run keeps its partial log, andparseLogreads it on purpose (the test that caused a timeout must show in the report).canceled, in which every test-bun job started. It passes over every other build, prints oneskipped build #N (...): S of T test-bun jobs startedline for each, and goes on to the next build of that branch, then to the next merged PR.warning:on stderr names each platform that has jobs that never started (darwin any x64 (1 of 2 started)). The exit code is 0 and--jsonhas no new field.expireddarwin x64 shard). That build is the only one on which this rule and "at least one job started" differ. The stake, from the complete table of build 128347 with one shard left out: a missing darwin x64 shard changes 10 to 26 of the 500 rows, an ASAN shard 12 to 26, a windows 11 aarch64 shard 3 to 13, another Linux shard 0 to 3.Where the empty builds come from
Failed to create agent for ... build-bunentries, each an EC2CapacityLimitExceeded. The 13 build-bun jobs were canceled and all 160 test-bun jobs ended aswaiting_failedwith nostarted_at. Build 128037 has the same job states..buildkite/ci.ts), so a build that fails to compile has the same job states. A[skip tests]commit gives a finished build with no test-bun job at all.started_athad an empty log in 161 of 161 cases checked (160waiting_failed, 1expired).Measurements (offline unless marked live: stub
ghandbkon PATH print captured Buildkite JSON, a local server counts log requests, main is ad4089b)bk build view1 -> 0 calls, REST requests 164 -> 161, log GETs 160 -> 160. Build 127137: log GETs 160 -> 0, exit code 0 -> 1. Onebk build viewis 3 REST requests (bk build view --debug, bk 3.57.0).top: []. This PR lists one more branch, takes 127905 and prints the report (163 REST requests, main 164).warning:.N --json,N,N 3,N 3 --json,N 0 --json, no argument with--json).bk build listcalls per no-argument run over 461 replayed minutes of 2026-10-18: max 4 (main 4), mean 2.27 (main 1.38). Minutes on a zero-test build: 0 (main 302). Minutes with no qualifying build: 0. Worst case with no complete build: 10 calls, 35.68 MB of JSON, exit 1. The replay is a model over one capture of 10 merged PRs, not a log of real runs.test.concurrentIf(!isASAN)): eight ASAN processes that start together take 4 to 6.5 s each and hit the default 5 s timeout in 2 of 4 runs, and one alone takes 0.6 to 1.2 s.gh/bkcalls, 0 bytes printed. Release binary: +0 bytes (3 files changed, 0 of them build inputs).N 0tells it apart, and that shape is byte-identical to main above), and the non-empty term of the "every list failed" headline (only an emptygh pr listtells it apart)."count": 0, "top": []at exit 0.Live checks (real
ghandbk)bun scripts/ci-slowest-tests.ts 127137 --json: main prints{"build":"127137","count":0,"top":[]}at exit 0 after 160 log requests. This PR prints nothing on stdout, exits 1 and makes 0 log requests. Stderr:error: build #127137 has no test timings: none of its 160 test-bun jobs started.bun scripts/ci-slowest-tests.ts --jsontook build 128347 (161 of 161 test-bun jobs started, on 12 of 12 platforms) with nobk build view. 19 of the 161 log requests failed (18 with a 429, 1 ECONNRESET). The table came out at exit 0 with no log from 4 of the 12 platforms. A second run fetched the 19 logs: 107 of the 500 rows of the complete table are absent from the first one or differ in it. This is main's behaviour for a failed download, and this PR does not change it.bk build listentry are byte-equal tobk build viewfor builds 127153 and 127137 (182 of 182 jobs each, after a key sort).Open PR #42712 (retries for rate-limited log downloads,
jobsFailedin--json, exit code 2)top: []at exit 0 for build 127137.SKILL.md+9/-3. Trial merge of ci:slowest: retry rate-limited log downloads and report missing logs #42712 into this branch: the script merges with 0 conflict hunks. The test file has 1 (both add imports to the same block) andSKILL.mdhas 1 (adjacent paragraphs). A union of both sides settles each.started_at. With that field added (1 line) 47 of 47 pass.started_atto the fixture jobs of ci:slowest: retry rate-limited log downloads and report missing logs #42712, and move its two spawn tests ontorunSlowest(a log value can already be a function that returns aResponse).jobsin--jsoncounts started jobs, and a never-started job is not a missing log: it stays awarning:at exit 0.--allow-partial.ci:sloweststill prints a table at exit 0 when some, but not all, log downloads fail.Left alone
scripts/find-build.ts:377(mergedPRFailingContexts, used byci:errors) takes the newest finished build of 5 merged PRs by state only. A build with no tests adds no annotation there, so a failure can be tagged[new]where it is pre-existing. It is another tool with no test file.scripts/update-parallel-allowlist.mjs:76counts test-bun jobs with afinished_at, which anexpiredjob also has.scripts/update-test-durations.mjs:140already requiresstarted_at.ci-slowest-tests.ts: the log cache keeps an empty or partial log forever, the top-N argument is not validated, and a failedbk build viewends in aJSON.parseexception.test-filescounts as complete when all of its own test-bun jobs started. Main takes such a build too when it is the newest finished build of its branch. An expected platform set or a minimum job count would go stale with the lanes, and atest-filesbuild keeps the full job count. None of the 54 captured builds is of that kind.scripts/runner.node.tsmeasures per-file durations itself and could publish them. The log stays the only source for a shard that was killed, so that is a larger change.Self-review
SKILL.mdno longer tells the reader to repeat the walk by hand. Abk build listthat fails is printed with its error, and a run in which every list fails has its own message. Three more spawn tests hold the exits that only one test held before.ghandbk, so they do not run on Windows. I did not run anything on Windows.no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/internal/ci-slowest-tests.test.ts