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Sentinel: shared:01m23vygyffx5hg2f5vm8r74sr:1le13aox3q is past its budget: trevato/forge: "/map on the forge-sized fixture, warm > stranger: p95 within the wall-clock floor, statements within a … #3023
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scout/forge:scout/2977-sentinel-shared-01m23vygyffx5hg2f5vm8r74 → main 2 commits fork 2 threads · 2 unresolved
1 file
changed +19
−6
test/map-cache.test.ts +19 −6
| @@ -67,31 +67,44 @@ describe("/map on the forge-sized fixture, warm", () => { | ||
| 67 | 67 | afterAll(() => servers.stop()); |
| 68 | 68 | |
| 69 | 69 | for (const who of ["owner", "stranger"] as const) { |
| 70 | test(`${who}: p95 within the wall-clock floor, statements within a fixed cost + 2 per lane`, async () => { | |
| 70 | test(`${who}: warm hits far cheaper than a cold build, statements within a fixed cost + 2 per lane`, async () => { | |
| 71 | 71 | const cookie = who === "owner" ? f.ownerCookie : f.strangerCookie; |
| 72 | // Both viewers share one cache, so drop it here: the first request is a | |
| 73 | // real cold build for this viewer, whichever test ran before. | |
| 74 | clearMapCache(); | |
| 75 | const coldStarted = performance.now(); | |
| 72 | 76 | const warm = await get(servers, "/map", cookie); |
| 77 | const cold = performance.now() - coldStarted; | |
| 73 | 78 | const lanes = lanesIn(warm); |
| 74 | 79 | expect(lanes).toBeGreaterThan(5); |
| 75 | 80 | const counter = countStatements(f.app.db); |
| 76 | 81 | const times: number[] = []; |
| 77 | let statements = 0; | |
| 82 | const counts: number[] = []; | |
| 78 | 83 | try { |
| 79 | 84 | for (let n = 0; n < 20; n++) { |
| 80 | 85 | counter.reset(); |
| 81 | 86 | const started = performance.now(); |
| 82 | 87 | await get(servers, "/map", cookie); |
| 83 | 88 | times.push(performance.now() - started); |
| 84 | statements = Math.max(statements, counter.count); | |
| 89 | counts.push(counter.count); | |
| 85 | 90 | } |
| 86 | 91 | } finally { |
| 87 | 92 | counter.stop(); |
| 88 | 93 | } |
| 89 | 94 | times.sort((a, b) => a - b); |
| 90 | 95 | const p95 = times[Math.ceil(times.length * 0.95) - 1]!; |
| 96 | const median = times[times.length >> 1]!; | |
| 97 | // The steady state: a lane's minute or the UTC day turning over mid-loop | |
| 98 | // rebuilds one request, and that is the cache working, not failing. | |
| 99 | counts.sort((a, b) => a - b); | |
| 100 | const statements = counts[counts.length >> 1]!; | |
| 91 | 101 | console.log(`${who}: ${lanes} lanes, p95 ${p95.toFixed(1)} ms, ${statements} statements`); |
| 92 | // 200 ms is the floor test/flake.test.ts allows a request; the budget | |
| 93 | // in the doc (50 ms) is read off bench/map-home.ts, not asserted here. | |
| 94 | expect(p95).toBeLessThan(200); | |
| 102 | // Wall-clock is the check machine's, so it is only ever a ratio between | |
| 103 | // two timings taken here, a real cold build and the warm median: a | |
outdated
The cold sample is not cold for the stranger (shared cache), and one sample against a median of 20 is noisy. Call clearMapCache() before the timed first request and assert a ratio, for example median * 3 < cold. The 5 ms floor is itself a machine-load bound. |
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| 104 | // missing cache puts them level. The doc's 50 ms budget is read off | |
| 105 | // bench/map-home.ts. p95 below is a hang guard, nothing more. | |
| 106 | expect(median * 3).toBeLessThan(cold); | |
| 107 | expect(p95).toBeLessThan(5_000); | |
| 95 | 108 | // The page's own chrome costs a fixed ~25 statements (session, settings, |
| 96 | 109 | // the repository lists); a lane costs at most two. Cold, it was ~2,700. |
| 97 | 110 | expect(statements).toBeLessThanOrEqual(CHROME + 2 * lanes); |
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The test name still says p95 within the wall-clock floor. Rename it to match what is asserted.