The instrument now times the same paste_faces_batch call in the host and
the device output mode, one session, one fixture, and asserts the two
are bit-identical. On the CPU fixture (8 frames, 360x640, stub nets):
the output assembly's host<->device traffic is gone (1.06 MB each way
becomes 0, the ROI-sized staging recorded as roi_staged_bytes), wall
-8.8%, process CPU -8.7%. The delta dilutes the CUDA effect - on the
owner's GPU the kernel work stays on the GPU and the removed portion is
pure host time - so the CUDA measurement of the same comparison stays
the owner-gated V2.
WildAi
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