---
id: pr-cccl-cub-8212
repo: NVIDIA/cccl
pr: 8212
title: Implement the new tuning API for `DispatchHistogram`
author: bernhardmgruber
date: '2026-03-31'
url: https://github.com/NVIDIA/cccl/pull/8212
source_category: upstream-code
architectures:
- sm100
tags:
- reduction
techniques: []
hardware_features: []
kernel_types:
- reduction
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: e58d119fddd1e67af6eff9d1f4d6d86d43e4cdb9
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- c/parallel/src/histogram.cu
- cub/cub/agent/agent_histogram.cuh
- cub/cub/device/device_histogram.cuh
- cub/cub/device/dispatch/dispatch_histogram.cuh
- cub/cub/device/dispatch/kernels/kernel_histogram.cuh
- cub/cub/device/dispatch/tuning/tuning_histogram.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8212
head_ref_oid: 683d315356bb11d9128237b42c291c8b31eeff22
---
# Implement the new tuning API for `DispatchHistogram`

- Repository: `NVIDIA/cccl`
- PR: [8212](https://github.com/NVIDIA/cccl/pull/8212)
- 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

- `c/parallel/src/histogram.cu`
- `cub/cub/agent/agent_histogram.cuh`
- `cub/cub/device/device_histogram.cuh`
- `cub/cub/device/dispatch/dispatch_histogram.cuh`
- `cub/cub/device/dispatch/kernels/kernel_histogram.cuh`
- `cub/cub/device/dispatch/tuning/tuning_histogram.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8212`
