Description

On nvidia, a pointer being member of a class is triggering a page fault. This does not occur if a local pointer is set on this member pointer right before the parallel region, i.e. the member pointer is more or less aliased locally.

• see discussion in forum https://forums.developer.nvidia.com/t/nvc-25-1-stdpar-htod-for-already-fetched-member-variable/324618
• is this also happening on shared memory architecture of AMD ?

AMD (e.g. Hunter)

• visualize with old version : https://ui.perfetto.dev/v46.0-35b3d9845/#!

NVIDIA (AIA / JUWELS Booster)

• visualize on aia fe2 with /opt/nvidia/nsight-compute/2025.1.0/ncu-ui post/aia_report.nsys-rep

Results

• AIA, NVIDIA Quadro RTX 6000, nvc++ 25.1
• JUWELS Booster, NVIDIA A100
• HUNTER, AMD MI300A