| 1 | # Oak Perf Loop Ledger
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| 2 |
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| 3 | This ledger is repo-tracked memory for the propose-mode overnight performance
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| 4 | loop. Every iteration appends a machine-readable `oak-perf-loop-entry` block
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| 5 | plus a short human summary. The harness uses this to avoid retrying targets or
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| 6 | levers that were already parked as no-payoff.
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| 7 |
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| 8 | ## Seed — core:large:many_small_files_50k/branch.create
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| 9 |
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| 10 | - Verdict: landed
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| 11 | - Medians: before 24.9 ms, after 7.5 ms, delta -69.9%
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| 12 | - Change: `oak switch -c` no longer eagerly loads the seed manifest when the new branch is seeded from the current head and no materialization can occur.
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| 13 | - Diagnosis: Instrumentation showed the expected dirty scan was not hit; the O(N) cost was seed-manifest loading.
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| 14 |
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| 15 | <!-- oak-perf-loop-entry
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| 16 | {
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| 17 | "schema_version": 1,
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| 18 | "timestamp": "2026-06-17T00:00:00+00:00",
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| 19 | "target": {
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| 20 | "lane": "core",
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| 21 | "profile": "large",
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| 22 | "scenario": "many_small_files_50k",
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| 23 | "operation": "branch.create",
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| 24 | "ratio": 2.15,
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| 25 | "oak_median_ms": 24.9,
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| 26 | "git_median_ms": 10.6
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| 27 | },
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| 28 | "diagnosis": "Instrumentation showed seed-manifest loading, not get_status dirty scanning, dominated the benchmark-shaped switch -c path.",
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| 29 | "change_summary": "Lazy-load the seed manifest only when switch -c will materialize the worktree.",
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| 30 | "before_after_medians": {
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| 31 | "before_ms": 24.9,
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| 32 | "after_ms": 7.5,
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| 33 | "delta_pct": -69.9
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| 34 | },
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| 35 | "landed_or_parked": "landed",
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| 36 | "reason": "merged_by_human",
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| 37 | "levers_rejected": []
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| 38 | }
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| 39 | -->
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| 40 |
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| 41 | ## Seed — core:large:many_small_files_50k/status.dirty
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| 42 |
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| 43 | - Verdict: landed
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| 44 | - Medians: before 171.5 ms, after 152.5 ms, delta -11.0%
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| 45 | - Change: Status/commit change computation diffs scanned entries directly instead of constructing a throwaway `Manifest`.
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| 46 | - Diagnosis: Instrumentation showed no single wasted scan; the paid structural pass was the full new-manifest construction plus manifest diff after entries were already resolved.
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| 47 | - Levers rejected:
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| 48 | - Walker metadata collapse: paired A/B on the same 50k/5k dirty fixtures was flat/slightly worse, so do not retry without new evidence.
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| 49 |
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| 50 | <!-- oak-perf-loop-entry
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| 51 | {
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| 52 | "schema_version": 1,
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| 53 | "timestamp": "2026-06-17T00:00:01+00:00",
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| 54 | "target": {
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| 55 | "lane": "core",
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| 56 | "profile": "large",
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| 57 | "scenario": "many_small_files_50k",
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| 58 | "operation": "status.dirty",
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| 59 | "ratio": 1.85,
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| 60 | "oak_median_ms": 171.5,
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| 61 | "git_median_ms": 92.7
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| 62 | },
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| 63 | "diagnosis": "Instrumented breakdown: walk ~40 ms, cache load ~9 ms, resolve+hash ~48 ms, manifest diff/construction ~21 ms, rename ~0 ms.",
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| 64 | "change_summary": "Diff scanned ManifestEntry values directly against HEAD and preserve exact-hash plus content-similarity rename detection.",
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| 65 | "before_after_medians": {
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| 66 | "before_ms": 171.5,
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| 67 | "after_ms": 152.5,
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| 68 | "delta_pct": -11.0
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| 69 | },
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| 70 | "landed_or_parked": "landed",
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| 71 | "reason": "merged_by_human",
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| 72 | "levers_rejected": [
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| 73 | "walker_metadata_collapse_no_payoff"
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| 74 | ]
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| 75 | }
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| 76 | -->
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| 77 |
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| 78 | ## 2026-06-17T07:12:13.154425+00:00 — core:large:many_small_files_50k/status.dirty
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| 79 |
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| 80 | - Verdict: parked
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| 81 | - Reason: dry_run_no_candidate_branch
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| 82 | - Current median: 152.5 ms
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| 83 | - Change: dry-run parked candidate
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| 84 | - Diagnosis: dry-run: target selection and ledger plumbing exercised; no Rust edit attempted
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| 85 |
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| 86 | <!-- oak-perf-loop-entry
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| 87 | {
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| 88 | "before_after_medians": {
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| 89 | "after_ms": null,
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| 90 | "before_ms": 152.5,
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| 91 | "delta_pct": null
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| 92 | },
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| 93 | "change_summary": "dry-run parked candidate",
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| 94 | "correctness_gate": [
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| 95 | {
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| 96 | "command": "dry-run",
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| 97 | "returncode": 0
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| 98 | }
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| 99 | ],
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| 100 | "diagnosis": "dry-run: target selection and ledger plumbing exercised; no Rust edit attempted",
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| 101 | "fleet_reliability_gate": "PASS",
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| 102 | "landed_or_parked": "parked",
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| 103 | "levers_rejected": [],
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| 104 | "oak_efficiency_gate": "PASS",
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| 105 | "reason": "dry_run_no_candidate_branch",
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| 106 | "schema_version": 1,
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| 107 | "target": {
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| 108 | "git_median_ms": 92.4,
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| 109 | "lane": "core",
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| 110 | "oak_median_ms": 152.5,
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| 111 | "operation": "status.dirty",
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| 112 | "profile": "large",
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| 113 | "ratio": 1.6504329004329004,
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| 114 | "scenario": "many_small_files_50k"
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| 115 | },
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| 116 | "timestamp": "2026-06-17T07:12:13.154425+00:00"
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| 117 | }
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| 118 | -->
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