1.5 KiB
Measured budget derivation (detection-core task 2.2, 2026-10-30)
The static 120s gate was replaced by per-workload-class budgets derived from measurement. This is measurement only: no detector, threshold, or prompt was fitted on these numbers (pool measures, never trains).
Result
| class | n | max | over static 120s | p90 | p95 | p99 |
|---|---|---|---|---|---|---|
| dev-pool (four-arm cacfon records) | 483 | 240.0s | 20 | 61.4s | 88.7s | 210.0s |
| admission-pilot (264 records) | 264 | 7.7s | 0 | 2.6s | 3.2s | 3.8s |
(derivation.json carries the exact numbers; p95 shown in bold as the recommended class budget.)
Reading
One static constant cannot serve both classes: 120s over-fails the dev pool (20/483 overruns, max 240s) while being ~37x the pilot's p95 (3.2s). Per-class measured budgets fix both directions. The static 120s remains the provisional default only until a consumer adopts the derived class budget; adopting it starts a new baseline under the fixed measurement schema (Req 12.2).
Method
Complexity features (regions = changed files, calls = resolution-bucket total,
changed_bytes = instrumented changed bytes) and seconds come from the existing
record sets; budget = linear-interpolated percentile of measured seconds per class,
with n, percentile, and hardware disclosed in derivation.json. Hardware:
local dev host, records of 2026-10-30.
Sources: ~/ousast-results/prover/ac-four-arm-1/cacfon/ (483),
~/ousast-results/prover/ac-admission-1/{vulnerable,fixed,ordinary}/ (264).
Script: /tmp/opencode/derive_budget_2.py.