---
id: pr-cccl-cub-7346
repo: NVIDIA/cccl
pr: 7346
title: Implement the new tuning API for deterministic (rfa) reduce dispatch
author: bernhardmgruber
date: '2026-02-25'
url: https://github.com/NVIDIA/cccl/pull/7346
source_category: upstream-code
architectures:
- sm90
tags:
- benchmark_test
- block reduce
- memory_primitives
- scheduler_autotune
- sm90
techniques:
- autotuning
- tile-scheduling
hardware_features:
- hopper
kernel_types:
- memory
- scheduler
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 9ef62efcb881a7803ca65b1d5ad90a8e0e555a2a
inclusion_reason: 'Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.'
changed_paths:
- cub/benchmarks/bench/reduce/deterministic.cu
- cub/cub/device/device_reduce.cuh
- cub/cub/device/dispatch/dispatch_reduce_deterministic.cuh
- cub/cub/device/dispatch/kernels/kernel_reduce.cuh
- cub/cub/device/dispatch/kernels/kernel_reduce_deterministic.cuh
- cub/cub/device/dispatch/tuning/tuning_reduce.cuh
- cub/cub/device/dispatch/tuning/tuning_reduce_deterministic.cuh
- cub/test/catch2_test_device_reduce_deterministic.cu
- cub/test/catch2_test_device_reduce_env.cu
- cub/test/catch2_test_device_transform.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-7346
head_ref_oid: d97016485ba35efbce13e5a3d8250f06958b0363
---
# Implement the new tuning API for deterministic (rfa) reduce dispatch

- Repository: `NVIDIA/cccl`
- PR: [7346](https://github.com/NVIDIA/cccl/pull/7346)
- 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/reduce/deterministic.cu`
- `cub/cub/device/device_reduce.cuh`
- `cub/cub/device/dispatch/dispatch_reduce_deterministic.cuh`
- `cub/cub/device/dispatch/kernels/kernel_reduce.cuh`
- `cub/cub/device/dispatch/kernels/kernel_reduce_deterministic.cuh`
- `cub/cub/device/dispatch/tuning/tuning_reduce.cuh`
- `cub/cub/device/dispatch/tuning/tuning_reduce_deterministic.cuh`
- `cub/test/catch2_test_device_reduce_deterministic.cu`
- `cub/test/catch2_test_device_reduce_env.cu`
- `cub/test/catch2_test_device_transform.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-7346`
