Is this a duplicate?

• I confirmed there appear to be no duplicate issues for this bug and that I agree to the Code of Conduct

Type of Bug

Performance

Component

CUB

Describe the bug

Looking at

and the at all the member functions, it seems like none of them is using both first_items and last_items, i.e. a single array halo_items or similar would suffice. The unnecessary amount of requested shared memory can in practice result in reduced occupancy and therefore worse performance.

How to Reproduce

Not applicable.

Expected behavior

BlockAdjacentDifference should only request as much shared memory as it actually needs.

Reproduction link

No response

Operating System

No response

nvidia-smi output

No response

NVCC version

No response