Exact: p.mtz and the pre-scan products (shadow mask, mean projection,
defective-pixel mask, ring and capture centres, compared as hashes and
hex floats) are bit-identical to rc174 on three in-house rotation sets,
GPU and CPU builds.
- ShadowFinder::GetMask: the serial parts run in parallel - connected
components by row band joined with union-find (both the shadow and
the transmitting-arm searches, and the hole fill), ring binning and
the harmonic sector gather by blocks, gap bridging by line; ring pixel
counts read off the ring offsets. Mean projection filled in parallel.
- ShadowFinder host accumulation: one band-locked projection instead of
a 20 B/px shard per pre-scan worker (2.7 GB zeroed and folded on a
16M detector); SetShardCount and the shard argument are gone.
- FindBeamCenterFromBackground: the usable-pixel test is made once, the
in-band pixels are kept in pixel order so the clipping rounds no
longer sweep the whole detector, the 67 MB cell map is gone and the
per-iteration block fold runs in parallel - same sums, same order.
- HotPixelFinder::GetMask: the chance-rate counts in parallel (integers).
Measured on a loaded box (load ~25 from other jobs), pre-scan window:
GPU 5.9-6.5 s -> 3.2-3.4 s, CPU 8.4-9.0 s -> 6.1-7.4 s. The GPU-build
pre-scan now ends with its background spot measurement (CPU spot finder
on ~120 frames, ~13 core-s on 8 workers).
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K5K8jvPPbmCrbqnWkddTuB
leonarski_fandClaude Opus 5.5
24e36ae740