Rijad Zuzo
71 lines
3.3 KiB
Markdown
71 lines
3.3 KiB
Markdown
# Simulation scaling baseline 02
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This is the reviewed comparison after introducing one reusable per-tick
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`SimulationPopulationView`. The view indexes all, living, and starving NPCs by
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stable ID, is refreshed as each NPC advances, and is shared by relationship and
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action-selection queries. It is transient derived state and is not serialized.
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The machine-readable samples are in
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[`simulation_scaling_baseline_02.json`](simulation_scaling_baseline_02.json).
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The workload, seed, host, exclusions, warmup, and three-sample median contract
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match [baseline 01](SIMULATION_SCALING_BASELINE_01.md).
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## Results
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| Case | NPCs | Seeded history | Median us/tick | Ticks/s | Simulated realtime | Arrival share | End JSON |
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| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
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| Population 6 | 6 | 0 | 63.85 | 15,662.93 | 18,795.5x | 4.5% | 0.06 MiB |
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| Population 60 | 60 | 0 | 662.62 | 1,509.17 | 1,811.0x | 5.7% | 0.56 MiB |
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| Population 600 | 600 | 0 | 11,654.10 | 85.81 | 103.0x | 18.0% | 5.67 MiB |
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| History 600 | 60 | 600 | 722.60 | 1,383.90 | 1,660.7x | 5.2% | 0.71 MiB |
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| History 6,000 | 60 | 6,000 | 1,430.65 | 698.98 | 838.8x | 2.6% | 2.04 MiB |
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All samples within each case were deterministic. More importantly, every final
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checksum exactly matches the corresponding baseline-01 checksum, so the
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optimization preserves selection, interleaved NPC updates, event growth, and
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serialized continuation state.
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## Comparison
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| Case | Baseline 01 us/tick | Baseline 02 us/tick | Change |
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| --- | ---: | ---: | ---: |
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| Population 6 | 55.74 | 63.85 | 14.6% slower |
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| Population 60 | 621.87 | 662.62 | 6.6% slower |
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| Population 600 | 15,187.74 | 11,654.10 | **23.3% faster** |
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| History 600 | 677.12 | 722.60 | 6.7% slower |
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| History 6,000 | 1,421.19 | 1,430.65 | 0.7% slower |
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The shared dictionaries add a small fixed per-tick cost, visible in tiny
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fixtures and normal local timing noise. At the measured population knee they
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remove repeated all-NPC lookup construction and improve the 600-NPC case from
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65.84 to 85.81 ticks per second. The local 50-ticks-per-second reference target
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remains comfortably met without introducing simulation LOD.
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## Decision and next measurement
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Keep the population view. It has a real relationship/action consumer, improves
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the measured pressure point, and preserves exact state. Do not add batching or
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active/abstract NPC modes merely to improve this data-only number.
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The next bounded scale slice should support the world vision directly: a
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loaded-resource spatial query owned by `ActiveWorldAdapter`. It should let
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villagers discover finite, stable-ID `ResourceNode` anchors placed much farther
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apart across Terrain3D while preserving the current score, reachability,
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reservation, and save/rebind contracts. A benchmark should compare 18, 180,
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and 1,800 loaded candidates before choosing a grid, tree, or other index.
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Terrain3D-instanced visual trees and grass are not automatically authoritative
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resources. Intentional harvest anchors must continue to bind simulation-owned
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`ResourceStateRecord` data by stable ID; large decorative populations can stay
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presentation-only until a gameplay rule needs them.
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## Capture command
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```bash
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/Applications/Godot.app/Contents/MacOS/Godot \
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--headless --path "$PWD" \
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--script res://tools/benchmark_simulation_scaling.gd -- \
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--host-label=Apple_M1_Max_64_GB \
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--output=res://docs/benchmarks/simulation_scaling_baseline_02.json
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```
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