Making the worker streams non-blocking removed the implicit ordering that the
constructors were still relying on. Each engine uploads its static inputs - the
pixel mask, the pixel-to-bin map, the corrections, the ROI map - with a blocking
NULL-stream cudaMemcpy, and then reads them from kernels on its own stream. A
pageable host-to-device cudaMemcpy returns once the source has been staged, with
the DMA still in flight, and a non-blocking stream no longer waits for the NULL
stream. The failure mode is a silently unapplied mask or a stale mapping, not a
crash, so it would not have announced itself.
Put them on the stream the engine already owns, and synchronise once at the end of
the constructor - that is required for the preprocessor, whose source is a local
vector, and leaves the others settled rather than in flight for the cost of one
one-time sync. The GPU spot-finder test uploaded its image the same way.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
leonarski_fandClaude Opus 5
bf866a0d4c