casa6 - no submodules

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  Rui Xue <rx.astro@gmail.com> Yesterday 4b3bfca414918261df2401ecd4274572d83dbf8f

  CAS-14756: use AutoNoReadLocking(inspectInterval=1s) in writeBackToFullImage
  NoLocking was allowing concurrent table.dat_tmp→table.dat renames to race
  across MPI workers, causing "RegularFile::move error: No such file or
  directory" in rank N's PagedImage destructor (job on cvpost124, build-5).
  
  casacore's table.dat metadata file is always shared — even when tile data
  blocks are strictly disjoint. NoLocking is therefore not safe for concurrent
  writers.
  
  AutoNoReadLocking with the default inspectInterval=0 is safe (the write lock
  is held from first putSlice to flush), but autoRelease() becomes a no-op and
  the entire writeback is serialized across workers — identical throughput to
  UserLocking.
  
  Setting inspectInterval=1.0 activates periodic lock inspection: every ~1 s
  autoRelease() checks whether another worker wants the lock; if so it flushes
  table.dat and releases, then the waiting worker acquires. Tile data I/O
  interleaves across workers (disjoint blocks → no contention); only the brief
  table.dat rename is serialized per transfer.

  • casatools/src/code/synthesis/ImagerObjects/CubeMajorCycleAlgorithm.cc (version 4b3bfca414918261df2401ecd4274572d83dbf8f) (diffs)