---
id: pr-flashinfer-2935
repo: flashinfer-ai/flashinfer
pr: 2935
title: 'fix: vectorize get_shuffle_matrix_a_row_indices to eliminate CPU contention'
author: youkaichao
date: '2026-04-01'
url: https://github.com/flashinfer-ai/flashinfer/pull/2935
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 5a906be2fd9c9298887a8108336b67f0148bfcb5
inclusion_reason: defer
changed_paths:
- flashinfer/utils.py
artifact_dir: evidence/pull-bundles/flashinfer/gh-2935
head_ref_oid: f62372cab57b5935a2650f90ce75dab3b8baf61b
---
# fix: vectorize get_shuffle_matrix_a_row_indices to eliminate CPU contention

- Repository: `flashinfer-ai/flashinfer`
- PR: [2935](https://github.com/flashinfer-ai/flashinfer/pull/2935)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `flashinfer/utils.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2935`
