docs: record expression scope performance evidence

docs/evidence/expression-scope-reuse-20260906.json

@@ -0,0 +1,108 @@
+{
+  "schemaVersion": "fidc.engine-expression-scope-performance/v1",
+  "generatedAt": "2026-09-06T17:45:00+08:00",
+  "host": "192.168.31.177",
+  "profile": {
+    "artifact": "/srv/fidc/canonical/run/fidc-private/evidence/profiles/fidc-hot-engine-d324d284-20260906.data",
+    "event": "cpu-clock",
+    "frequencyHz": 499,
+    "samples": 3501,
+    "lostSamples": 0,
+    "scope": "system.slice/fidc-backtest-service-highmem177.service",
+    "observedSelfOverheadPercent": {
+      "chronoDelayedFormat": 6.31,
+      "chronoStrftimeIterator": 5.0,
+      "selectiveScopePushDynamic": 5.2,
+      "selectiveScopePushString": 3.48,
+      "selectiveScopePushInteger": 3.03,
+      "selectiveScopePushBoolean": 1.09,
+      "marketBySymbolId": 6.2,
+      "malloc": 4.74,
+      "free": 2.43
+    }
+  },
+  "change": {
+    "baselineEngineCommit": "630a7a1",
+    "candidateEngineCommit": "840473362d7032b80d551ba5935723ee823dffa1",
+    "serviceCommit": "bac07c208c652a717d312e332d44f90218cc1247",
+    "behavior": "Expression scope identifiers are passed directly to Rhai without an intermediate heap String. Trade, decision and execution date strings are formatted once per DayExpressionState and reused as ImmutableString values by every expression evaluation on that day."
+  },
+  "request": {
+    "sourceRunId": "btr_1788681250851_3170500_1",
+    "startDate": "2023-01-03",
+    "endDate": "2025-12-31",
+    "frequency": "1d",
+    "matchingType": "next_bar_open",
+    "initialCash": 10000000.0,
+    "benchmark": "000852.SH",
+    "frozenBundleReused": true
+  },
+  "baseline": {
+    "runIds": [
+      "btr_1788686878533_3170500_3",
+      "btr_1788686907702_3170500_4",
+      "btr_1788687153269_3170500_5"
+    ],
+    "engineSeconds": [
+      6.582,
+      6.442,
+      6.352
+    ],
+    "engineMedianSeconds": 6.442,
+    "totalSeconds": [
+      7.22,
+      7.04,
+      7.388
+    ],
+    "totalMedianSeconds": 7.22
+  },
+  "candidate": {
+    "coldRun": {
+      "runId": "btr_1788687746484_3277755_0",
+      "totalSeconds": 13.369,
+      "dataSeconds": 7.827,
+      "engineSeconds": 4.925,
+      "classification": "runner_process_cold"
+    },
+    "hotRunIds": [
+      "btr_1788687763649_3277755_1",
+      "btr_1788687774308_3277755_2",
+      "btr_1788687798961_3277755_3",
+      "btr_1788687813292_3277755_4"
+    ],
+    "hotEngineSeconds": [
+      5.021,
+      5.077,
+      5.18,
+      4.951
+    ],
+    "hotEngineMedianSeconds": 5.049,
+    "hotTotalSeconds": [
+      5.659,
+      5.756,
+      5.836,
+      5.84
+    ],
+    "hotTotalMedianSeconds": 5.796,
+    "engineMedianImprovementPercent": 21.624,
+    "totalMedianImprovementPercent": 19.723
+  },
+  "correctness": {
+    "totalReturn": -0.615167693429,
+    "tradeCount": 4961,
+    "canonicalResultSha256": "f9c26271d4f2096e51429b6106740f600757823789bf6447cd0c524f702f0836",
+    "resultStoreSha256": "56042bd25bd4261e41e8237c9f5ead580b782d897baae58c8e4436f331a1d91f",
+    "allFiveCandidateRunsEqualBaseline": true,
+    "returnDelta": 0.0,
+    "tradeCountDelta": 0
+  },
+  "validation": {
+    "cargoFmt": "passed",
+    "platformExpressionTests": "180 passed, 1 ignored",
+    "workspaceTests": "421 passed, 6 ignored plus all integration tests passed",
+    "runtimeUser": "boris",
+    "serviceHealth": "ok",
+    "buildManifest": "/srv/fidc/canonical/run/build/fidc-backtest-service.json",
+    "runnerBinarySha256": "909cb47ef20128b4990bf355d0c63e10d7d74aac128067fa19c971698c5d85bc"
+  }
+}