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LR-IMP-FORMATS: ARW6 decode timing method

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Co-Authored-By: Claude <noreply@anthropic.com>
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2026-10-10 21:08:17 +02:00
co-authored by Claude
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docs/arw6-compression.md
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@@ -104,13 +104,13 @@ Unconditional synthetic tests (encode -> decode round trips for both geometries,
## Timings
Raw decode only (`lightcraft_raw::decode`, release build, 4 CPUs, best of 3 wall-clock, 2026-10-10):
Raw decode only, 4 CPUs, release build, best of 3 wall-clock (2026-10-10). Method: a small throwaway Rust program linking `lightcraft-raw` reads the file into memory, then times `lightcraft_raw::decode` alone with `std::time::Instant` (no render, no JPEG encode), three decodes in one process; the best is reported. Files were already in the page cache.
| File | Size | Sensor | Decode |
|---|---|---|---|
| ILCE-7RM6 FF, Compressed (HQ) | 63.5 MB | 10016x6672 | 0.78 s |
| ILCE-7RM6 FF, Compressed | 63.8 MB | 10016x6672 | 0.78 s |
| ILCE-7RM6 APS-C, Compressed (HQ) | 29.7 MB | 6592x4372 | 0.49 s |
| ILCE-7RM6 APS-C, Compressed | 30.9 MB | 6592x4372 | 0.42 s |
| ILCE-7RM6 FF, Compressed (HQ) | 63.5 MB | 10016x6672 | 0.45 s |
| ILCE-7RM6 FF, Compressed | 63.8 MB | 10016x6672 | 0.51 s |
| ILCE-7RM6 APS-C, Compressed (HQ) | 29.7 MB | 6592x4372 | 0.35 s |
| ILCE-7RM6 APS-C, Compressed | 30.9 MB | 6592x4372 | 0.34 s |
The 1.0 s budget for the full-frame file is met. Parallelised: rayon over the tiles, over the 13 streams of each tile and over its 3 components.