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vac-optimizer/docs/benchmark/issue-302.md
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nessarandClaude Opus 5.5 2fcba758c8 perf(planning): retain the best valid plan more cheaply
Retaining a better valid plan reconciled its optimization provenance,
which evaluated every active objective once per credited placement with
that placement released. Only the credited objectives are compared, so
the released plan now evaluates just those and skips observing the
others. Retention also stops computing quality metrics that nothing
read. The retained plan and what Cancel returns are unchanged.

Part of #302.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-18 19:50:58 +02:00

3.2 KiB

Issue #302: plan from the best-ranked obligation solution

Step-by-step record for issue #302. The exact steps keep planning outcomes, stable explanations and final states identical to the frozen engine at a871f8f. The frozen-engine differential check, including its cancelled asynchronous comparisons, passes after every step.

Per-step measurements

Each step was timed against its parent in the same session, on the development machine (AMD Ryzen 7 7800X3D, WSL2, Bun 1.4.3), with no other test, build or profiling workload running. Both commits' cores were bundled with the frozen-engine build command and called through calculatePlanningAsyncInternal in one Bun process, with calculationDate: '2024-01-01'. This is the benchmark's in-thread asynchronous path, without the planning-calculation service. For every scenario, each engine ran one warm-up and then one measured calculation, alternating engines. Outcomes, explanations and final states were hashed; every pair below matched. Only same-session pairs are comparable.

Reuse the donor ranking across public-holiday weeks

For every public-holiday week, the holiday-week stage ranked every placement as a potential donor by releasing it and evaluating the active objectives. That ranking depends only on the plan, so the weeks of one plan now share each placement's released objectives. Each week still skips its own dates and walks the placements in the same order with the same yields.

Scenario Before (s) After (s)
representative year 0.66 0.66
typed obligations 5.11 4.89
chained earned entitlements 0.02 0.02
deliberate conflict 0.01 0.01
loaded year 58.26 57.75
two years 2.27 1.82
three years 7.45 5.52

Retain the best valid plan more cheaply

Retaining a better valid plan for cancellation reconciled its optimization provenance. For every placement credited by an optimization rule, that evaluated all active objectives with the placement released. Only the credited objectives are compared, so the released plan now evaluates just those, and the calendar observations of the other objectives are no longer computed. Retention also no longer computes quality metrics that nothing read. An instrumented three-year run spent 1.16 of its 1.22 retention seconds in that reconciliation; afterwards retention took 0.26 seconds.

Scenario Before (s) After (s)
representative year 0.45 0.37
typed obligations 4.76 5.03
chained earned entitlements 0.02 0.02
deliberate conflict 0.01 0.01
loaded year 55.59 53.58
two years 1.68 1.22
three years 5.29 3.85

The typed-obligations difference is run-to-run noise; its retention cost was 22 milliseconds.