Four changes to the per-run fixed cost of a stills run (Step 2 geometry refinement, Step 3 pre-scan),
none of which changes what is computed:
- Module placement: the four held-out fits and the placement on every strong frame are independent, and
one Ceres fit keeps only ~4.6-6.5 of 32 cores busy (perf, JF16M, 4000 frames / 150888 spots). They
now run side by side on a fifth of the threads each; the placement fit is computed speculatively and
used only where the held-out residuals call for it, as before. Baseline (quiet): held-out 12.3 s +
placement 5.1 s on JF16M, 16.4 + 6.5 s on JF4M, 19.0 + 7.6 s on MPCCD.
- Module scan (+-25 px grid per module ahead of the placement) was one thread: every grid shift is now
scored on the workers and the grid then walked in its old order, so the first best still wins
(3.3 s on JF16M, ~5 s on JF4M/MPCCD before). New test ScanModuleShifts_FindsShiftedModule checks the
shift is found and that 1 and 4 threads give the same answer.
- Stills geometry trial: each hypothesis (centre, distance, frame sample) is indexed once. The distance
grid ran twice on the same centre whenever the file's centre was kept (40 of ~275 hypotheses,
~15% of the trial: 6.2 s on JF16M, 6.7 s on the flat JF8M), and the final here/there check repeated
the first trial. Repeats always gave the same count (checked on three logs).
- The saturation histogram (40 frames, 0.1-2.2 s) reads only frames and the mask: it is taken beside
the geometry refinement and the limit decided where it was, after it.
Plus TIMING marks for the sub-steps (geometry refinement sample, module scan, module placement fits).
Outputs identical to the baseline binary (bb7c9c) where checked: JF16M int16 15 runs (geometry, all
32 module shifts, held-out residuals, cell), JF4M int16, MPCCD 236 (indexing rate, CC1/2, R_split,
R-free with --model identical), PAL 90 and LCLS 222 (identical reports).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
leonarski_fandClaude Opus 5.5
96322a8ec9