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25 lines
1 KiB
Markdown
25 lines
1 KiB
Markdown
# ADR 003: No ECS, no SoA, no hand-written SIMD at this scale
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Status: accepted (Phases 6–8, grounded in docs/PERF_BASELINE.md).
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## Context
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Measured tick cost is ~15–25µs median (debug) over ~40 entities against a
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16,600µs frame budget. The costs are latency-shaped (lookups, one small
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allocation, branches over dozens of items), never compute-shaped.
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## Decision
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- No ECS/archetype storage, no SoA migration, no SIMD intrinsics.
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- Optimizations stay at the lookup/allocation/branch level (index caches,
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squared compares, buffer discipline).
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- Reopen thresholds (any one reopens the question, with a fresh profile):
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simultaneous movers > 16 (spatial index first, SoA with it), tick p50
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> 1,000µs sustained on target hardware, or entity counts > 1,000.
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## Consequences
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- `LaneBox`/`BayBox` stay AoS; `nearest_hazard_*` stays a linear scan;
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each carries a comment naming the threshold that would change it.
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- Contributors proposing intrinsics or an ECS must attach a profile
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showing the current shape is insufficient.
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