---
id: pr-cccl-cub-8332
repo: NVIDIA/cccl
pr: 8332
title: simplify dispatch segmented reduce to use latest dispatch and new tunings API
author: srinivasyadav18
date: '2026-04-24'
url: https://github.com/NVIDIA/cccl/pull/8332
source_category: upstream-code
architectures:
- sm100
tags:
- benchmark
- benchmark_test
- block reduce
- memory_primitives
- policy tuning
- reduce
- scheduler_autotune
- segmented reduce
- warp reduce
techniques:
- autotuning
- tile-scheduling
- warp-specialization
hardware_features: []
kernel_types:
- memory
- scheduler
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: c8bff5be91bea9a211f7ad37c1ad449d444f4a34
inclusion_reason: Mine shape sets, tolerance rules, warmup logic, and profile commands before mutating code.
changed_paths:
- c/parallel/src/segmented_reduce.cu
- cub/benchmarks/bench/segmented_reduce/base.cuh
- cub/benchmarks/bench/segmented_reduce/variable_base.cuh
- cub/cub/agent/agent_reduce.cuh
- cub/cub/device/device_segmented_reduce.cuh
- cub/cub/device/dispatch/dispatch_fixed_size_segmented_reduce.cuh
- cub/cub/device/dispatch/dispatch_reduce.cuh
- cub/cub/device/dispatch/dispatch_segmented_reduce.cuh
- cub/cub/device/dispatch/kernels/kernel_segmented_reduce.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8332
head_ref_oid: 0b209f63512c041d00fc324b82ae29bf7ff83312
---
# simplify dispatch segmented reduce to use latest dispatch and new tunings API

- Repository: `NVIDIA/cccl`
- PR: [8332](https://github.com/NVIDIA/cccl/pull/8332)
- Decision: `Mine shape sets, tolerance rules, warmup logic, and profile commands before mutating code.`
- Reason: Mine shape sets, tolerance rules, warmup logic, and profile commands before mutating code.

## Changed Paths

- `c/parallel/src/segmented_reduce.cu`
- `cub/benchmarks/bench/segmented_reduce/base.cuh`
- `cub/benchmarks/bench/segmented_reduce/variable_base.cuh`
- `cub/cub/agent/agent_reduce.cuh`
- `cub/cub/device/device_segmented_reduce.cuh`
- `cub/cub/device/dispatch/dispatch_fixed_size_segmented_reduce.cuh`
- `cub/cub/device/dispatch/dispatch_reduce.cuh`
- `cub/cub/device/dispatch/dispatch_segmented_reduce.cuh`
- `cub/cub/device/dispatch/kernels/kernel_segmented_reduce.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8332`
