---
id: pr-cccl-cub-6992
repo: NVIDIA/cccl
pr: 6992
title: use cooperative_groups in `execution::bulk` to synchronize across thread blocks
author: ericniebler
date: '2025-12-16'
url: https://github.com/NVIDIA/cccl/pull/6992
source_category: upstream-code
architectures:
- sm100
tags:
- cooperative-groups
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 6ff79efde0588e5d97dec824459767922519096d
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cudax/include/cuda/experimental/__execution/bulk.cuh
- cudax/include/cuda/experimental/__execution/stream/adaptor.cuh
- cudax/include/cuda/experimental/__execution/stream/bulk.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-6992
head_ref_oid: 78b9e65a834bf0ead99894a52c85a2f8ee0b742a
---
# use cooperative_groups in `execution::bulk` to synchronize across thread blocks

- Repository: `NVIDIA/cccl`
- PR: [6992](https://github.com/NVIDIA/cccl/pull/6992)
- 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

- `cudax/include/cuda/experimental/__execution/bulk.cuh`
- `cudax/include/cuda/experimental/__execution/stream/adaptor.cuh`
- `cudax/include/cuda/experimental/__execution/stream/bulk.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-6992`
