---
id: pr-cccl-cub-7944
repo: NVIDIA/cccl
pr: 7944
title: Reduce usage of `cub::DispatchReduce`
author: bernhardmgruber
date: '2026-03-10'
url: https://github.com/NVIDIA/cccl/pull/7944
source_category: upstream-code
architectures:
- sm100
tags:
- benchmark_test
- memory_primitives
- reduce
techniques: []
hardware_features: []
kernel_types:
- memory
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 7a6d8f804ad124c1cd6703ea8b5c92f0e9bf729d
inclusion_reason: 'Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.'
changed_paths:
- cub/benchmarks/bench/transform_reduce/sum.cu
- cub/cub/device/dispatch/dispatch_reduce.cuh
- cub/test/catch2_test_device_reduce_dispatcher.cu
- docs/cub/tuning.rst
artifact_dir: evidence/pull-bundles/cccl-cub/gh-7944
head_ref_oid: 050fff24ccc5aae4bf15cdd6f74574ac15421271
---
# Reduce usage of `cub::DispatchReduce`

- Repository: `NVIDIA/cccl`
- PR: [7944](https://github.com/NVIDIA/cccl/pull/7944)
- Decision: `Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.`
- Reason: Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.

## Changed Paths

- `cub/benchmarks/bench/transform_reduce/sum.cu`
- `cub/cub/device/dispatch/dispatch_reduce.cuh`
- `cub/test/catch2_test_device_reduce_dispatcher.cu`
- `docs/cub/tuning.rst`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-7944`
