---
id: pr-cccl-cub-6932
repo: NVIDIA/cccl
pr: 6932
title: '[CUB]: Use the new tuning API for nondeterministic reduce'
author: NaderAlAwar
date: '2025-12-10'
url: https://github.com/NVIDIA/cccl/pull/6932
source_category: upstream-code
architectures:
- sm100
tags:
- sm100
techniques: []
hardware_features:
- blackwell
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 5bf8ffb88c08a01dbd2225d576378e49617d9fed
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/benchmarks/bench/reduce/nondeterministic.cu
- cub/cub/device/device_reduce.cuh
- cub/cub/device/dispatch/dispatch_reduce_nondeterministic.cuh
- cub/test/catch2_test_device_reduce_env.cu
- cub/test/catch2_test_device_reduce_nondeterministic.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-6932
head_ref_oid: a9020fc66c4ea9b6a4837ff2882a2b23e78c7acb
---
# [CUB]: Use the new tuning API for nondeterministic reduce

- Repository: `NVIDIA/cccl`
- PR: [6932](https://github.com/NVIDIA/cccl/pull/6932)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `cub/benchmarks/bench/reduce/nondeterministic.cu`
- `cub/cub/device/device_reduce.cuh`
- `cub/cub/device/dispatch/dispatch_reduce_nondeterministic.cuh`
- `cub/test/catch2_test_device_reduce_env.cu`
- `cub/test/catch2_test_device_reduce_nondeterministic.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-6932`
