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perf(lighting): bound global light selection

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Replace over-cap full sorting with a retained exact top-k heap while preserving the accepted tie-order fallback. Differential tests lock randomized and Town Network-scale output, and the measured 463-light path cuts selector CPU by 29 percent without warmed allocations.
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Erik 2026-07-25 05:40:32 +02:00
parent b3427554c3
commit a2a1e5916d
5 changed files with 615 additions and 21 deletions
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9
docs/plans/2026-07-25-modern-runtime-slice-h.md
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@ -101,7 +101,7 @@ with all optional consumers disabled.
Landed evidence:
[`../research/2026-07-25-slice-h-a4-frame-scratch.md`](../research/2026-07-25-slice-h-a4-frame-scratch.md).
## 3. H-b — exact light top-k
## 3. H-b — exact light top-k — COMPLETE
Retail anchors:
@ -126,6 +126,13 @@ Gate: identical selected IDs and submission order for every fixture, identical
Town Network screenshot, reduced overflow CPU/allocation, and AP-85 retired
only after the visual evidence passes.
Landed evidence:
[`../research/2026-07-25-slice-h-b-light-top-k-report.md`](../research/2026-07-25-slice-h-b-light-top-k-report.md).
The deterministic differential fixtures preserve exact accepted output; the
463-light diagnostic microbenchmark reduced selection CPU time by 29.1% with
zero warmed allocations. AP-85 remains open because its retail dual-pool
behavior is outside this performance-only unit.
## 4. H-c — ordered, allocation-conscious network I/O
Retail/transport invariants: