---
id: pr-flashinfer-2239
repo: flashinfer-ai/flashinfer
pr: 2239
title: Allreduce auto backend improvements
author: nvmbreughe
date: '2025-12-20'
url: https://github.com/flashinfer-ai/flashinfer/pull/2239
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 519671d97bdbeedef740646a0fa06c7de58822b4
inclusion_reason: include
changed_paths:
- flashinfer/comm/allreduce.py
- flashinfer/comm/mnnvl.py
- flashinfer/comm/trtllm_ar.py
- flashinfer/comm/trtllm_mnnvl_ar.py
- tests/comm/conftest.py
- tests/comm/test_allreduce_unified_api.py
- tests/comm/test_trtllm_allreduce_fusion.py
- tests/comm/test_trtllm_mnnvl_allreduce.py
- tests/test_helpers/comm.py
artifact_dir: evidence/pull-bundles/flashinfer/gh-2239
head_ref_oid: 1cb0870740952b13c0ea522267f91ad7a62c6db5
---
# Allreduce auto backend improvements

- Repository: `flashinfer-ai/flashinfer`
- PR: [2239](https://github.com/flashinfer-ai/flashinfer/pull/2239)
- Decision: `include`
- Reason: include

## Changed Paths

- `flashinfer/comm/allreduce.py`
- `flashinfer/comm/mnnvl.py`
- `flashinfer/comm/trtllm_ar.py`
- `flashinfer/comm/trtllm_mnnvl_ar.py`
- `tests/comm/conftest.py`
- `tests/comm/test_allreduce_unified_api.py`
- `tests/comm/test_trtllm_allreduce_fusion.py`
- `tests/comm/test_trtllm_mnnvl_allreduce.py`
- `tests/test_helpers/comm.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2239`
