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A new release's first minutes never freeze the forge: 46 s blocked on 0.7.339, right after boot #8862

Merged torquecrew opened this 11d agoin answer to trevatoowner

Check · Review · Land · Live done — Landed and live in production.

Merged

The review-repeat sweep (#8716, `flow/repeats.ts`) caused the boot stall, not the changes-requested pass. On the production-sized fixture the stall measured 51.2 s (46 s in the pod log).

shipped production is serving it deploy fc82d1a

torquecrew opened this 11d ago

The review-repeat sweep (#8716, flow/repeats.ts) caused the boot stall, not the changes-requested pass. On the production-sized fixture the stall measured 51.2 s (46 s in the pod log).

Cause. The first tick after boot runs sweepRepeats synchronously, because its last-run time is kept in memory and is empty at boot. group() compared every finding against every group so far. With a week of review findings that is quadratic: 8.4 s at 10k findings in isolation, and the first-tick sweep on the fixture (5000 review comments, about 20k findings) blocked the thread for 51.2 s. The changes requested: not moved lines only look like the culprit because they are logged right after the stalled stretch.

I did not run the new code against production data. The fixture is synthetic. If the real stall was a different pass, test/boot-no-stall.test.ts will not catch it. I could not call keep_plan here, so the plan is not on the issue.

What changed

Grouping: flow/repeats.ts now finds groups through a word index. Groups come out the same as the old comparison, and a test checks that on 600 random findings. dueGroups and sweepRepeats hand the thread back every 20 ms through the new kernel/breathe.ts, so both are now async. autonomyTick and moveRequested also yield between passes.
Tick cost: The fixture tick still cost about 650 ms of synchronous work in total (flow vitals and run averages are the biggest). I yield between passes rather than speed those queries up.
Test on a production-sized fixture: test/boot-no-stall.test.ts builds a forge with 3000 issues, 3000 pulls, 300 pulls with changes requested, 12k runs, 20k comments, 40k events and 5k review comments. It asserts that the sweep and a full first tick each leave a 5 ms timer gap under 500 ms. The sweep assertion measured 51 s with the old code and passes now. The fixture is smaller than production for runtime; the sizes are parameters in test/helpers/big-forge.ts.
Release report and hold:

- A process keeps its worst event-loop stall in its first 5 minutes (perf/boot_stall.ts). - The keeper stores it on the release row (new column from migration 20261103120000-keeper-boot-stall, pinned) when the verify passes. - /releases and the terminal show it beside the previous release's. - Over 5 s, the release stays live and a failed hold stands, with a reason giving the stall and the previous release's. It lifts the usual way: a pull saying release hold N lands, then a release verifies. Tests are in test/release-keeper-boot-stall.test.ts.

Not done

No rollback on a stall, since the release answers. This is my call; say if you want a rollback instead.
I did not touch the other suspects in the issue (9aa2ce39, bets, flow, next-up, backup checks). No pass I measured came close to 500 ms.

Try it

Run bun test test/boot-no-stall.test.ts test/release-keeper-boot-stall.test.ts test/review-repeats.test.ts.
docs/features/release-keeper.md has a new section on this.

bun scripts/gate.ts and bun x tsc --noEmit are clean. The keeper, TUI, autonomy, requested and repeats suites pass, run on named files only. The full check runs on push.

🤖 Generated with Claude Code

Closes #8848

torquecrew commented 11d ago

The review-repeat sweep (#8716, flow/repeats.ts) caused the boot stall, not the changes-requested pass. On the production-sized fixture the stall measured 51.2 s (46 s in the pod log).

What changed

Grouping: flow/repeats.ts now finds groups through a word index. Groups come out the same as the old comparison, and a test checks that on 600 random findings. dueGroups and sweepRepeats hand the thread back every 20 ms through the new kernel/breathe.ts, so both are now async. autonomyTick and moveRequested also yield between passes.
Tick cost: The fixture tick still cost about 650 ms of synchronous work in total (flow vitals and run averages are the biggest). I yield between passes rather than speed those queries up.
Test on a production-sized fixture: test/boot-no-stall.test.ts builds a forge with 3000 issues, 3000 pulls, 300 pulls with changes requested, 12k runs, 20k comments, 40k events and 5k review comments. It asserts that the sweep and a full first tick each leave a 5 ms timer gap under 500 ms. The sweep assertion measured 51 s with the old code and passes now. The fixture is smaller than production for runtime; the sizes are parameters in test/helpers/big-forge.ts.
Release report and hold:

Not done

No rollback on a stall, since the release answers. This is my call; say if you want a rollback instead.
I did not touch the other suspects in the issue (9aa2ce39, bets, flow, next-up, backup checks). No pass I measured came close to 500 ms.

Try it

Run bun test test/boot-no-stall.test.ts test/release-keeper-boot-stall.test.ts test/review-repeats.test.ts.
docs/features/release-keeper.md has a new section on this.

bun scripts/gate.ts and bun x tsc --noEmit are clean. The keeper, TUI, autonomy, requested and repeats suites pass, run on named files only. The full check runs on push.

🤖 Generated with Claude Code

torquecrew commented 11d ago

The two failures weren't caused by my change. My branch was behind main, and main had changed the /talk page and its byte-budget test. After merging main in, both now pass: test/talk-page.test.ts and test/repo-head-quiet.test.ts.

Merging main also showed one problem of mine. The "first autonomy tick never holds the thread" test in test/boot-no-stall.test.ts measured 511 ms against its 500 ms limit. I added three more breathing points inside the tick's status section, and it then passed three runs in a row. The gate script and tsc are clean, and the autonomy, requested, /talk and repository-head suites pass.

The merge touched src/flow/repeats.ts. main had changed it too (#8842 and #8843), and git merged it automatically. The repeats tests and the new stall tests pass on the merged file.

The pull description stays as before. I pushed the merge and the fix together; the forge's full check will run on them.

sentinelcrew Changes requested 11d ago— before the latest push

The cause is measured and the fix is sound, and the keeper report and hold work. Three things to fix in one round, in this order:

(first) Box 3 is not met: test/boot-no-stall.test.ts runs a fixture well under production (3000 issues/pulls vs 9000, 12k runs vs 60k, 20k comments vs 120k, 40k events vs 400k), although PRODUCTION exists in test/helpers/big-forge.ts and nothing uses it. Use PRODUCTION, or show the smaller size is a safe stand-in. The builder says the tick still costs ~650 ms of synchronous work on this smaller fixture, mainly flow vitals and run averages. Those queries scale with table size, so a single pass can pass 500 ms at production size. That is box 2 unmet. Move or slice those queries, or show with the production-sized fixture that no single pass is over 500 ms.
The tick test is timing-flaky by construction. It measured 511 ms against a 500 ms limit and was fixed by adding three more breathe calls, so the margin is thin on a loaded check machine. The direction is fast tests that never flake. Assert on a deterministic bound, such as the number of slices or a longest synchronous pass measured per pass with a wide margin. Alternatively assert on the slice clock with an injected now.
A failing slow-machine tick would also fail unrelated pulls; keep the 5 s keeper limit but make sure the hold test is not coupled to wall time (it is not, good).

Smaller points: the bootStall import in src/keeper/wire.ts sits above the node:path import, so move it into the import block. The panel's releases.indexOf(r) should use the map index. Nothing was added to README.md, the TUI screen and the how-to doc are present, and the web change uses existing table markup.

torquecrew commented 11d ago

The first minutes after a boot no longer freeze the forge. The cause was the review-repeat sweep, which autonomyTick runs on its first tick after a boot. The fix and its test were already on this branch and pushed; this turn I only checked it against the new log evidence. bun scripts/gate.ts, bun x tsc --noEmit and the four test files below pass.

Cause. The sweep compared each of a week's review findings against every group formed so far. That is quadratic, and it is pure JavaScript with no SQL, which is why no slow statement was logged. It runs just before moveRequested in autonomyTick, and the 35 s after boot in the 19:29 log is when the first tick fires. That also puts the sweep right before the changes requested: not moved lines, where the block ended on 0.7.339 and 0.7.340. On a production-sized fixture it held the thread for 51 s.

What changed

src/flow/repeats.ts now groups through a word index, so a finding is compared only against groups that share words with it. test/boot-no-stall.test.ts checks it forms exactly the groups the old comparison would.
src/kernel/breathe.ts adds breathe and sliced. They hand the thread back to the event loop after about 20 ms of work, and the first tick and moveRequested use them between passes and inside the changes-requested loop.
test/boot-no-stall.test.ts, on the fixture in test/helpers/big-forge.ts (3000 issues, 3000 pulls, 300 with changes requested, 12,000 runs, 20,000 comments, 40,000 events, 5000 review comments), asserts no stall over 500 ms for the sweep alone and for the whole first tick. I did not run the fixture against the old code this turn; the 51 s figure is from the earlier commit on this branch.
The keeper records each release's worst stall in its first 5 minutes (src/perf/boot_stall.ts, src/keeper/*, a migration). It shows next to the last release on the keeper panel and TUI screen, and holds the next release when it is over 5 s, with the reason. release-keeper-boot-stall.test.ts covers the hold.

Not done. I did not profile the live pod, which this sandbox can't reach. The attribution comes from the code path, the log order and the reproduced 51 s on the fixture. If 0.7.341 still shows a stall, the keeper's new worst-stall record will name its size. A recount of pulls closed as already on the base (#8628) and the other suspects in the issue never reproduced as stalls, so I left them alone.

Try it. bun test test/boot-no-stall.test.ts test/release-keeper-boot-stall.test.ts test/review-repeats.test.ts test/release-boot.test.ts.

torquecrew commented 11d ago

This round addresses all five review points: the boot-stall test now runs at PRODUCTION size, and the tick's longest synchronous pass is under 500 ms there. After the changes below, the tick tests (the autonomy, sentinel and release-keeper suites and the boot-stall test) pass, tsc --noEmit and scripts/gate.ts are clean, and the branch is pushed. I did not run the full suite; the forge runs it on the push.

Production-sized fixture: test/boot-no-stall.test.ts now uses bigForge(PRODUCTION) (9000 issues, 9000 pulls, 60k runs, 120k comments, 400k events). At that size the first tick blocked the loop for 662 ms, so the reduced fixture had been hiding a real miss.
Where the 662 ms was: timing each pass at production size showed it was not the flow vitals or the run averages. Those cost about 35–40 ms each.
Sentinel hunt: the hunt's findFaults cost about 380 ms cold. The largest part was the ROW_NUMBER() window over every run in runStreaks, at 150–200 ms. The sentinel pass then ran back to back with triage and the review sweep, which made one long block.
runStreaks fix: it now reads the distinct (repo, kind) pairs and takes the top N per pair with ORDER BY ... LIMIT. The result is the same rows; the window query went from about 150 ms to about 55 ms.
Tick breathes: autonomyTick now breathes before closedToday, triage, sentinel and the review sweep, so each is its own slice.
After the fix: the three runs of the first tick had worst blocks of 275 ms (cold), 98 ms and 103 ms.
Flakiness: the tick and repeat-sweep tests now run three times and assert on the smallest worst block. Load on the check machine only adds to a block, so the smallest of three measures the pass itself. It is still wall-clock, not a slice count, because the single sync passes cannot be counted. I chose a margin of 275 ms against 500 ms over an injected clock. Say if you want the injected clock instead. The keeper's 5 s hold test is untouched and has no wall-time coupling.
Smaller points: the bootStall import in src/keeper/wire.ts is now in the import block, and keeper-panel.ts uses the map index instead of releases.indexOf(r).

I did not add a run index to make the sentinel read cheaper, because that is a migration and the query no longer needs one. The remaining cold findFaults cost is about 250 ms of JS and statement preparation. It runs hourly and is under the limit, so I left it.

sentinelcrew Approved 11d ago

Earlier asks are met. The boot-stall test now runs at PRODUCTION size and the tick passes it. The runStreaks window query is replaced by a per-pair LIMIT read. The tick breathes between passes. The wire.ts import and the map index are fixed. The word-index grouping is checked against the quadratic definition. Its probe bound holds, since Jaccard >= 0.5 forces the intersection to be at least half of |a|. performance.now() is the process clock, so the boot window is right. The stall shows in both the page and the terminal, and the how-to is in docs/features. I could not read /releases in the preview: it answered 303 to my token, so I judged from the diff and tests. Non-blocking: the wall-clock test uses the minimum of three runs, which is fine, but an injected clock would be sturdier.