Doc: Record production PSF chunk geometry

Preserve the protected full-catalog dummy run, its initial harness failure, input and output hashes, distribution quantiles, and the resulting sparse-tile scheduling conclusions.
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# Production chunk geometry diagnostic (2026-09-11)
## Scope
This run measures the event stream that the production HIP sink would receive
for the supplied Schwarzschild Galactic-center render. `PSF_BACKEND=dummy`
keeps the real imported lens map, all-sky prefetch, OpenMP dynamic triangle
scheduling, inverse mapping, redshift/color/flux work, PSF cache eligibility,
and 16,384-event per-worker chunk boundaries. It does not initialize HIP,
allocate a full HDR framebuffer, splat pixels, or write PNG/FITS output.
The run used repository revision `11e703e33dffb1ff168ba11dd922e68b448116b9`
plus the uncommitted dummy-backend work. The complete stdout/stderr, executable
and input hashes, process resource use, and protected-output hashes are in
[`full_catalog.log`](full_catalog.log). An initial harness-only failure before
the renderer started is retained as
[`full_catalog_missing_time.log`](full_catalog_missing_time.log).
## Build and run
```sh
make -j1 PSF_BACKEND=dummy SPACETIME=schwarzschild ENABLE_HDR=1 backend
python3 benchmarks/dummy_psf_chunks_2026-09-11/run.py
```
The runner fixes `OMP_NUM_THREADS=16` and `OMP_DYNAMIC=FALSE`, uses a 600-second
timeout and a process lock, refuses to overwrite its log, and hashes both the
named PNG and companion FITS before and after the run. Its renderer arguments
are exactly the user-supplied command except that the `_hip` executable is
replaced by `_dummy`; the exact expanded command is the first line of the log.
Inputs and protected outputs:
- lens map SHA-256:
`905f960aea2d276f9586c79fba545a72cf742311e9e7e18faea293835c68bf28`
- existing PNG SHA-256 before/after:
`3e01feb911e60acce545a6a86870ca05f96250022e874eb8097bec88a8879bfd`
- existing FITS SHA-256 before/after:
`2408e62dcc22f147da284d87af9a2b0fdd0050eda2dabc23b6ec2554b2f1d38e`
Both protected files retained the same size and nanosecond mtime as well as the
same hash. No HIP backend was run.
## Result
The catalog prefetch loaded 343,363,141 stars for 130,882 lens triangles. The
producer classified 598,264,924 cache events, with zero direct fallbacks,
wing-clipped events, or min-Y discards. Sixteen workers produced 36,524 chunks:
36,508 full chunks and one final partial chunk per worker.
| full-chunk metric | min | p10 | p25 | p50 | p75 | p90 | p99 | max |
|---|---:|---:|---:|---:|---:|---:|---:|---:|
| event-producing triangles | 1 | 1 | 1 | 2 | 3 | 10 | 31 | 59 |
| occupied 32px center tiles | 1 | 1 | 1 | 1 | 2 | 5 | 30 | 45 |
| event bbox diagonal (px) | 0.199 | 0.742 | 3.250 | 12.651 | 57.018 | 429.306 | 3759.261 | 3834.557 |
| triangle-centroid bbox diagonal (px) | 0 | 0 | 0 | 9.618 | 49.477 | 424.149 | 3744.061 | 3824.075 |
| maximum successive centroid jump (px) | 0 | 0 | 0 | 8.724 | 25.157 | 144.000 | 3744.034 | 3792.034 |
All 36,508 full chunks satisfy the replay prototype's current selector:
`events >= 8192 && events / occupied_32px_tiles >= 32`.
Catalog prefetch took 55.469 s. Producer classification and chunk accounting
took 232.340 s; total process wall time was 288.872 s. These are diagnostic CPU
costs and do not estimate HIP tile-kernel speed.
## Interpretation and limits
The measured production event order strongly supports the hypothesis that a
full worker chunk is usually filled by very few image-plane triangles: the
median is two and 75% contain at most three. Center-tile occupancy is even more
concentrated. This is favorable for a tile16 path because the same output pixels
receive many contributions that can be reduced before the final double HDR
write.
The rare tail matters: p99 chunks can contain a few clusters separated by
nearly the full 4K image width. “Few triangles” therefore does not imply one
small contiguous bounding rectangle. A production implementation should use a
sparse occupied-tile list, retain the atomic fallback, and measure the complete
streaming sink including binning and synchronization.
This is one Schwarzschild Galactic-center frame with one 16-worker dynamic
schedule. Worker-to-triangle assignment is nondeterministic, so exact quantiles
may vary between runs. The result establishes event geometry for this input; it
does not by itself establish single-BH/BBH universality or a HIP speedup.
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COMMAND OMP_NUM_THREADS=16 OMP_DYNAMIC=FALSE /home/wyj/Code/C/GR_4d_raytracing/build/Release/schwarzschild_sky_dummy --verbose --psf-relative-tail 1e-8 --psf-min-y 0 --max-cache-psf-flux 1e8 --all-sky-catalog assets/2mass/processed/all_sky --exposure 1e13 --psf-fwhm-pixels 2.7 --psf-moffat-beta 4.5 --catalog-load-workers 4 --hdr-output --lens-map-input output/lens/schwarzschild_galactic_center_R100_45deg_16_4_4k_.grlens --output output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu.png
GIT 11e703e33dffb1ff168ba11dd922e68b448116b9
BINARY_SHA256 c71a843a6064cd730b4694c5fe4e61249a995106526da0fdca97bc625c7db470
LENS_SHA256 905f960aea2d276f9586c79fba545a72cf742311e9e7e18faea293835c68bf28
PROTECTED_BEFORE output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu.png sha256=3e01feb911e60acce545a6a86870ca05f96250022e874eb8097bec88a8879bfd size=13072572 mtime_ns=1788744728751407011
PROTECTED_BEFORE output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu_HDR.fits sha256=2408e62dcc22f147da284d87af9a2b0fdd0050eda2dabc23b6ec2554b2f1d38e size=99535680 mtime_ns=1788744726380022561
Dummy PSF backend: --output and --hdr-output are accepted for command parity but no image files will be written.
PSF cache ready: 64x64 phases, radius 47 px, relative tail 1e-08, tail abs 1e-06, boundary 1e-07, build 0.678 s
Frame 0: finding and prefetching catalog tiles...
Catalog prefetch: 64440 requested, 64440 newly loaded (343363141 stars), 0 unavailable in 55.469 s; 4 loader workers
Frame 0: catalog prefetch finished (64440 candidate tiles).
Frame 0: splatting 130882 lens triangles...
Frame 0: splat worker 2/16 started.
Frame 0: splat worker 1/16 started.
Frame 0: splat worker 4/16 started.
Frame 0: splat worker 3/16 started.
Frame 0: splat worker 5/16 started.
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Frame 0: splat worker 14/16 started.
Frame 0: splat worker 16/16 started.
Frame 0: splat worker 15/16 started.
Frame 0: splat worker 1/16 reached 8 local triangles.
Frame 0: splat worker 6/16 reached 8 local triangles.
Frame 0: splat worker 10/16 reached 8 local triangles.
Frame 0: splat worker 14/16 reached 8 local triangles.
Frame 0: splat worker 12/16 reached 8 local triangles.
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Frame 0: splat worker 12/16 reached 32 local triangles.
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Frame 0: splat worker 4/16 reached 64 local triangles.
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Frame 0: splat worker 4/16 reached 128 local triangles.
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Frame 0: splat worker 13/16 reached 256 local triangles.
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Frame 0: splat worker 1/16 reached 256 local triangles.
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Frame 0: splat worker 8/16 reached 512 local triangles.
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Frame 0: splat worker 8/16 reached 2048 local triangles.
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Frame 0: splat worker 3/16 reached 4096 local triangles.
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Frame 0: splat worker 3/16 reached 8192 local triangles.
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Frame 0: splat worker 2/16 finished after 7916 local triangles.
Frame 0: splat worker 8/16 finished after 8212 local triangles.
Frame 0: splat worker 6/16 finished after 8150 local triangles.
Frame 0: splat worker 1/16 finished after 7784 local triangles.
Frame 0: splat worker 4/16 finished after 8227 local triangles.
Frame 0: splat worker 15/16 finished after 7878 local triangles.
Frame 0: splat worker 14/16 finished after 8186 local triangles.
Frame 0: splat worker 11/16 finished after 7962 local triangles.
Frame 0: splat worker 9/16 finished after 8276 local triangles.
Frame 0: splat worker 16/16 finished after 8477 local triangles.
Frame 0: splat worker 3/16 finished after 8967 local triangles.
Frame 0: splat worker 7/16 finished after 8576 local triangles.
Frame 0: splat worker 10/16 finished after 7772 local triangles.
Frame 0: splat worker 13/16 finished after 8295 local triangles.
Frame 0: splat worker 12/16 finished after 8013 local triangles.
Frame 0: splat worker 5/16 finished after 8191 local triangles.
Dummy PSF diagnostic only: no HDR or image was accumulated/written.
Dummy PSF chunks: total=36524 full=36508 partial=16 events=598264924 capacity=16384 selector_tile=32px
Dummy PSF all events: min=263.000 p10=16384.000 p25=16384.000 p50=16384.000 p75=16384.000 p90=16384.000 p99=16384.000 max=16384.000
Dummy PSF all distinct_triangles: min=1.000 p10=1.000 p25=1.000 p50=2.000 p75=4.000 p90=10.000 p99=31.000 max=59.000
Dummy PSF all occupied_32px_tiles: min=1.000 p10=1.000 p25=1.000 p50=1.000 p75=2.000 p90=5.000 p99=30.000 max=45.000
Dummy PSF all event_bbox_diagonal_px: min=0.199 p10=0.743 p25=3.252 p50=12.667 p75=57.123 p90=432.049 p99=3759.261 max=3834.557
Dummy PSF all triangle_centroid_bbox_diagonal_px: min=0.000 p10=0.000 p25=0.000 p50=9.621 p75=49.817 p90=425.680 p99=3744.061 max=3824.075
Dummy PSF all maximum_successive_triangle_jump_px: min=0.000 p10=0.000 p25=0.000 p50=8.750 p75=25.157 p90=144.000 p99=3744.034 max=3792.034
Dummy PSF all adaptive criterion: 36516/36524 chunks tile16-eligible (events>=8192 and events/occupied_32px_tiles>=32)
Dummy PSF full events: min=16384.000 p10=16384.000 p25=16384.000 p50=16384.000 p75=16384.000 p90=16384.000 p99=16384.000 max=16384.000
Dummy PSF full distinct_triangles: min=1.000 p10=1.000 p25=1.000 p50=2.000 p75=3.000 p90=10.000 p99=31.000 max=59.000
Dummy PSF full occupied_32px_tiles: min=1.000 p10=1.000 p25=1.000 p50=1.000 p75=2.000 p90=5.000 p99=30.000 max=45.000
Dummy PSF full event_bbox_diagonal_px: min=0.199 p10=0.742 p25=3.250 p50=12.651 p75=57.018 p90=429.306 p99=3759.261 max=3834.557
Dummy PSF full triangle_centroid_bbox_diagonal_px: min=0.000 p10=0.000 p25=0.000 p50=9.618 p75=49.477 p90=424.149 p99=3744.061 max=3824.075
Dummy PSF full maximum_successive_triangle_jump_px: min=0.000 p10=0.000 p25=0.000 p50=8.724 p75=25.157 p90=144.000 p99=3744.034 max=3792.034
Dummy PSF full adaptive criterion: 36508/36508 chunks tile16-eligible (events>=8192 and events/occupied_32px_tiles>=32)
Dummy PSF producers: 16 workers; classification/chunk wall 232.340 s
Frame 0: catalog classification finished in 232.3 s; reporting chunk statistics...
Dummy PSF classified 598264924 images from 343363141 catalog stars; no HDR, PNG, or PPM was written.
PSF splats: cached 598264924, cached wing-clipped 0, direct fallbacks 0, discarded below min-Y 0
PROCESS_WALL 288.871615309 EXIT 0
PROCESS_USER 3815.986955000 PROCESS_SYSTEM 12.140569000 MAX_RSS_KIB 13769936
PROTECTED_AFTER output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu.png sha256=3e01feb911e60acce545a6a86870ca05f96250022e874eb8097bec88a8879bfd size=13072572 mtime_ns=1788744728751407011 unchanged=yes
PROTECTED_AFTER output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu_HDR.fits sha256=2408e62dcc22f147da284d87af9a2b0fdd0050eda2dabc23b6ec2554b2f1d38e size=99535680 mtime_ns=1788744726380022561 unchanged=yes
@@ -0,0 +1,6 @@
COMMAND OMP_NUM_THREADS=16 OMP_DYNAMIC=FALSE /usr/bin/time -v /home/wyj/Code/C/GR_4d_raytracing/build/Release/schwarzschild_sky_dummy --verbose --psf-relative-tail 1e-8 --psf-min-y 0 --max-cache-psf-flux 1e8 --all-sky-catalog assets/2mass/processed/all_sky --exposure 1e13 --psf-fwhm-pixels 2.7 --psf-moffat-beta 4.5 --catalog-load-workers 4 --hdr-output --lens-map-input output/lens/schwarzschild_galactic_center_R100_45deg_16_4_4k_.grlens --output output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu.png
GIT 11e703e33dffb1ff168ba11dd922e68b448116b9
BINARY_SHA256 c71a843a6064cd730b4694c5fe4e61249a995106526da0fdca97bc625c7db470
LENS_SHA256 905f960aea2d276f9586c79fba545a72cf742311e9e7e18faea293835c68bf28
PROTECTED_BEFORE output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu.png sha256=3e01feb911e60acce545a6a86870ca05f96250022e874eb8097bec88a8879bfd size=13072572 mtime_ns=1788744728751407011
PROTECTED_BEFORE output/imgs/2mass_galactic_center_schwarzschild_R100_4k_1e13_beta4.5_16_4-full-gpu_HDR.fits sha256=2408e62dcc22f147da284d87af9a2b0fdd0050eda2dabc23b6ec2554b2f1d38e size=99535680 mtime_ns=1788744726380022561