---
id: pr-quack-87
repo: Dao-AILab/quack
pr: 87
title: Optimal Tile Size for Blackwell Symmetric is (256, 256)
author: JackCharlesZhang
date: '2026-03-25'
url: https://github.com/Dao-AILab/quack/pull/87
source_category: upstream-code
architectures:
- sm100
tags:
- blackwell
techniques: []
hardware_features:
- blackwell
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 490a300b09981fe9565c82ff64d5448a6bc1bb7d
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- quack/gemm_interface.py
- tests/test_gemm_symmetric.py
artifact_dir: evidence/pull-bundles/quack/gh-87
head_ref_oid: 07792a629277f1f1aa15245dae116bf2abe5509c
---
# Optimal Tile Size for Blackwell Symmetric is (256, 256)

- Repository: `Dao-AILab/quack`
- PR: [87](https://github.com/Dao-AILab/quack/pull/87)
- 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

- `quack/gemm_interface.py`
- `tests/test_gemm_symmetric.py`

## Evidence Bundle

`evidence/pull-bundles/quack/gh-87`
