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standalone: cheap chunk crossings -- exact-tile slab compile, nearest tiles first (~1.2 s -> 121 ms peak)

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- Core compiles exact-tile analytic slabs for entering tiles; a Z-column sampler reuses the coherent
  noise context along each tile column; the viewer keeps residents and prioritises nearby tiles.
- 30-crossing straight flight: nearest tile ready 15.8 ms median / 27.6 ms max; full crossing wall
  121 ms peak; worker CPU per crossing 545 ms median, 834 ms max.
- W1/W8 hashes equal; routes 5642/5642; look, passage, stair, thin-sheet, coarse-panel and far
  audits pass; bad-shell control fails; path-hash audit kept.
Cold whole view, measured by me interleaved (busy machine): 1.242 s vs 1.255 s for 3b37d57, parity.
Still open from the owner (LOD0): fins along a strata seam, choppy stair facets.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ
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Fr0zkaandClaude Opus 5.5 committed 2026-10-05 20:12:51 +02:00
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Standalone/Core/verification/chunk_fast_column_results.md
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# Chunk streaming optimization results
Build: `VoxelForgeChunkStreamFastColumn.exe`; built with `Standalone/Build.ps1` (`/MP8`) and run via `Core/verification/RunMachine.ps1` (`BelowNormal`, affinity `0xFF00`). No `0xC0000142` occurred. Cache-use audits report zero hits.
## Flight benchmark
Command: `--shape-world --test-flight-crossings=30 --flight-speed-mps=16 --workers=8`. Straight +Y flight, 30 unit chunk crossings. `crossing wall` is from crossing start through all requested tiles; `worker CPU sum` sums each tile job's execution time across workers.
| Crossing | Tiles | Page-covered | Regions | Core region wall ms | Nearest ready ms | Nearest tile | Worker CPU sum ms | Crossing wall ms |
|---:|---:|---:|---:|---:|---:|:---|---:|---:|
| 1 | 144 | 128 | 1 | 9.1 | 16.62 | `-1,-4,-2,lod1` | 478 | 105 |
| 2 | 144 | 0 | 0 | 0.0 | 2.48 | `-3,-10,-3,lod0` | 128 | 19 |
| 3 | 108 | 0 | 0 | 0.0 | 2.73 | `-1,0,-1,lod2` | 98 | 15 |
| 4 | 144 | 128 | 1 | 6.2 | 9.75 | `-3,-8,-3,lod0` | 450 | 67 |
| 5 | 144 | 128 | 1 | 7.7 | 11.81 | `-2,-2,-2,lod1` | 405 | 62 |
| 6 | 144 | 128 | 1 | 6.6 | 11.25 | `-3,-6,-4,lod0` | 545 | 78 |
| 7 | 76 | 0 | 0 | 0.0 | 1.90 | `-1,2,-1,lod3` | 44 | 8 |
| 8 | 144 | 128 | 1 | 5.7 | 9.35 | `-3,-4,-4,lod0` | 452 | 69 |
| 9 | 144 | 128 | 1 | 7.2 | 14.34 | `-1,0,-2,lod1` | 618 | 89 |
| 10 | 144 | 128 | 1 | 5.8 | 9.20 | `-3,-2,-3,lod0` | 511 | 75 |
| 11 | 108 | 0 | 0 | 0.0 | 2.25 | `-1,2,-1,lod2` | 80 | 12 |
| 12 | 144 | 144 | 2 | 8.9 | 16.00 | `-3,0,-3,lod0` | 729 | 108 |
| 13 | 144 | 128 | 1 | 7.5 | 21.19 | `-2,2,-2,lod1` | 700 | 100 |
| 14 | 144 | 144 | 2 | 11.7 | 27.57 | `-3,2,-4,lod0` | 786 | 118 |
| 15 | 26 | 0 | 0 | 0.0 | 10.29 | `-1,6,-1,lod8` | 123 | 19 |
| 16 | 144 | 144 | 2 | 9.2 | 23.58 | `-3,4,-4,lod0` | 798 | 115 |
| 17 | 144 | 128 | 1 | 7.5 | 24.21 | `-1,4,-2,lod1` | 675 | 105 |
| 18 | 144 | 144 | 2 | 9.2 | 20.95 | `-3,6,-3,lod0` | 834 | 120 |
| 19 | 108 | 0 | 0 | 0.0 | 2.22 | `-1,4,-1,lod2` | 62 | 10 |
| 20 | 144 | 144 | 2 | 9.8 | 20.24 | `-3,8,-3,lod0` | 704 | 106 |
| 21 | 144 | 128 | 1 | 6.7 | 22.71 | `-2,6,-2,lod1` | 771 | 121 |
| 22 | 144 | 144 | 2 | 10.2 | 21.40 | `-3,10,-4,lod0` | 605 | 93 |
| 23 | 76 | 0 | 0 | 0.0 | 1.88 | `-1,4,-1,lod3` | 38 | 6 |
| 24 | 144 | 144 | 2 | 8.5 | 19.45 | `-3,12,-4,lod0` | 620 | 93 |
| 25 | 144 | 128 | 1 | 8.2 | 23.03 | `-1,8,-2,lod1` | 758 | 116 |
| 26 | 144 | 144 | 2 | 8.2 | 15.76 | `-3,14,-3,lod0` | 659 | 97 |
| 27 | 108 | 0 | 0 | 0.0 | 2.74 | `-1,6,-1,lod2` | 51 | 9 |
| 28 | 144 | 144 | 2 | 8.2 | 16.06 | `-3,16,-3,lod0` | 663 | 97 |
| 29 | 144 | 128 | 1 | 7.6 | 20.73 | `-2,10,-2,lod1` | 483 | 80 |
| 30 | 144 | 144 | 2 | 9.2 | 21.09 | `-3,18,-4,lod0` | 700 | 104 |
Flight summary: [FlightBenchmarkComplete] crossings=30/30 speed=16.00m/s elapsed=15.006s cache_hits=0 crossing_deltas=unit-+Y nearest_ready_p50=15.762ms nearest_ready_p95=23.577ms nearest_ready_max=27.570ms max_crossing_wall=0.121s max_worker_cpu_sum=0.834s resident=2226/2226 missing_tiles=0 deferred_leavers=0 uploads_drained=yes status=PASS
Nearest-ready median/p95/max: 15.762 / 23.577 / 27.570 ms. Maximum full crossing wall: 121 ms. Aggregate worker CPU sum: median 545 ms, p95 798 ms, max 834 ms. The 200 ms wall-latency target is met; a 200 ms aggregate-CPU interpretation is not. All 30 crossings completed; resident 2226/2226, missing tiles 0, deferred leavers 0, uploads drained, cache hits 0.
## Profile
The prior packed-page crossing in `owner_final6_chunk_crossing.stdout.log` rebuilt 16 pages covering 128 tiles: Core page wall 1.1828 s, then tile worker sum 156 ms and crossing wall 1.206 s. The analytic path now builds one region for a typical new slab (sometimes two); the flight log shows 0 lattice nodes and 0 interval/sign or detail-band compile time, with primitive/bin setup at about 6–12 ms per region. Crossings already covered by the initial region or retained tiles build 0 new regions. The 128 LOD1 tile meshes dominate new-slab work at roughly 0.4–0.8 s aggregate worker CPU, while all tile jobs finish in 0.06–0.12 s wall. The 30-crossing residency audit found no holes, deferred leavers, or undrained uploads.
Crossing 1 profile: Core slab build 9.6 ms wall / 9.1 ms worker, zero lattice nodes and zero interval/detail work; tile meshing 478 ms aggregate worker CPU (128 LOD1 tiles: 472 ms; 16 LOD2: 6 ms), 105 ms crossing wall, nearest tile ready in 16.62 ms. This replaces the baseline 1.183 s page build and 1.206 s crossing wall.
## Determinism and cold view
W1 and W8 full-clipmap command: `--stream-benchmark --shape-world --force-generate --stream-hash --workers=N --clip-radius=3`. Both generated 2226/2226 tiles with cache hits 0 and identical hashes: density `0x0ed4113e468cda86`, mesh `0x20c2f9d3e3d28c6e`, payload `0xd0349793eed57609`, topology `0x0ed6c6bc668bfb9b`.
Interleaved cold comparison used `--stream-benchmark --shape-world --force-generate --stream-hash --workers=8 --clip-radius=3`, order baseline A / candidate A / candidate B / baseline B. `StreamFullClipmap` walls: baseline 0.826 / 0.759 s (mean 0.793 s); candidate 0.744 / 0.729 s (mean 0.737 s), with identical hashes and zero cache hits.
## Audits
- Route audit: 5642/5642 PASS.
- Shape/look checks: flat surface, grid stair, thin sheet, flat patch, surface band, detail PASS. Six fixed captures match the prior candidate bit-for-bit. Against Round 11, changed pixels were 1432 (chamber), 310 (tunnel), 3879 (passage), 514 (far), 1811 (passage-floor close-up), and 0 (tunnel bend); each view remains 800×1280. Against `OwnerFinal6`, five views are bit-identical and 339/1,024,000 passage-floor pixels differ (mean channel delta 0.003896, max 58). Passage-floor recapture is bit-identical.
- Passage wall detail: 13,271 passage samples, ratio 1.152, PASS.
- Grid-stair distance: 952,997 sign edges, zero candidate fallback edges and zero both-fallback edges, PASS.
- Fine shard audit: zero thin sheets, PASS. Coarse panel audit: zero off-surface panels and zero panel triangles, PASS.
- Far survival: 7,200 boundary columns, zero missing/extra/hole samples, PASS. Bad-shell control: expected FAIL, 16 missing boundary surfaces, 512 removed triangles, exit 14.
## Log files
- Flight: `chunk_fast_column_flight30.stdout.log`
- Path hash: `chunk_fast_column_path_hash.stdout.log`
- W1/W8: `chunk_fast_column_hash_w1.stdout.log`, `chunk_fast_column_hash_w8.stdout.log`
- Cold runs: `chunk_fast_column_cold_baseline_a.stdout.log`, `chunk_fast_column_cold_candidate_a.stdout.log`, `chunk_fast_column_cold_candidate_b.stdout.log`, `chunk_fast_column_cold_baseline_b.stdout.log`
- Audits: `chunk_fast_column_shape_audit.stdout.log`, `chunk_fast_column_passage_detail.stdout.log`, `chunk_fast_column_grid_stair.stdout.log`, `chunk_fast_column_mesh_far_audits.stdout.log`, `chunk_fast_column_bad_shell_control.stdout.log`