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transformer_mt
The vGPU GR engine's failing chains are correct for the by=0 band and
replicate one tile for rows >= 16 with the QMD geometry and the input recs
proven clean, so the remaining hypothesis is engine-side CTA-coordinate
behaviour. ctaid_probe reads it directly in two phases on the exact
(16,4,1)/(16,16,1) geometry:
Phase 1 coord_map writes by*10000+bx*100+ty*10+tx per element (int32
64x256) and reports per-band row0 plus a bad count - a collapsed or
wrong CTAID.Y shows instantly.
Phase 2 arow_read writes A[(by*16+ty)*256+(bx*16+tx)] with A[i]=i, so a
correct engine reads each band's own rows; a collapsed row register reads
one band's rows everywhere.
transformer_mt prints its per-chain geometry (GEO lines) for the host-side
GRID-WIT comparison. Runtime <10 s. Built with
nvcc -O2 --cudart=static -arch=sm_75 (deterministic static runtime).
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