---
id: pr-vllm-23964
repo: vllm-project/vllm
pr: 23964
title: Enable Allgather/ReduceScatter backend for NaiveAllToAll
author: wenscarl
date: '2025-09-18'
url: https://github.com/vllm-project/vllm/pull/23964
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 2ea50e977aac00c63e78990a7477bb91295df183
inclusion_reason: defer
changed_paths:
- vllm/distributed/device_communicators/all2all.py
- vllm/distributed/device_communicators/cuda_communicator.py
- vllm/envs.py
artifact_dir: evidence/pull-bundles/vllm/gh-23964
head_ref_oid: e02aa12774985ad73799db2b6ba964232b25d185
---
# Enable Allgather/ReduceScatter backend for NaiveAllToAll

- Repository: `vllm-project/vllm`
- PR: [23964](https://github.com/vllm-project/vllm/pull/23964)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `vllm/distributed/device_communicators/all2all.py`
- `vllm/distributed/device_communicators/cuda_communicator.py`
- `vllm/envs.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-23964`
