leonarski_fandClaude Opus 5.5
420750e0aa
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rugnux will mostly run on GPFS/Lustre-type storage. GPFS caches in its own
fixed-size pagepool, often smaller than a dataset, so streaming the files
ahead of the consumer can evict data before it is used; and choosing the
behaviour by the underlying filesystem is not wanted. This removes the
ReadAhead streamer of aa3fa6b9c: reader/ReadAhead.{h,cpp},
JFJochReader::StartReadAhead/NoteImageRead, the DataFiles() lists that only
it used (HDF5 reader, HDF5ImageSource, HDF5ImageLocator, CBF/marCCD/SMV),
and its start in rugnux_cli.cpp.
Kept from the same commit: the in-order CBF/marCCD/SMV header scan
(sweep::ForEachInOrder) and the 16 kB -> 256 kB CBF header probe, with its
test. They only change the order and size of reads the program makes
anyway, hold no memory and read less (cold 2400-frame CBF header scan
18 s -> 6 s on the measured HDD).
Output unchanged: myob p.hkl, p.mtz, p_P1.mtz and p_unmerged.mtz
byte-identical to the rc173 reference (17.1 s wall warm, 3.8 GB peak RSS).
Reader tests: [HDF5] 108 cases, CBF/marCCD/SMV/sweep/VDS/GetRawImage cases
all pass.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01D1G8gJVAy6gp1K5Dz3NE5C