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Dirk Hornung

PROFILE

Dirk Hornung

Dirk H built and modernized a unified GPU autotuning framework across openxla/xla, ROCm/tensorflow-upstream, and Intel-tensorflow/xla, enabling robust, backend-agnostic performance tuning for GEMM and convolution workloads. He engineered backend integration for cuBLAS, cuBLASLt, cuDNN, MIOpen, RocBLAS, and HipBLASLt, leveraging C++ and CUDA to optimize kernel selection and memory usage. Dirk refactored autotuner configuration, introduced device-less and AOT autotuning, and improved logging, error handling, and test coverage. His work streamlined backend management, reduced profiling overhead, and improved reliability, resulting in a maintainable, extensible autotuning ecosystem that accelerates GPU performance tuning across diverse hardware and software environments.

Overall Statistics

Feature vs Bugs

85%Features

Repository Contributions

245Total
Bugs
13
Commits
245
Features
76
Lines of code
43,730
Activity Months10

Work History

February 2026

15 Commits • 4 Features

Feb 1, 2026

February 2026 performance and migration-readiness update for Intel-tensorflow/xla and Intel-tensorflow/tensorflow. Implemented cross-backend autotuner workspace sizing to optimize GPU memory usage and GEMM performance across cuBLAS Lt, HipBLAS Lt, and RocBlas. Aligned and extended tests for CublasLt migration and Dot functionality, ensuring test coverage matches new API requirements and improving migration readiness. Delivered backend-specific workspace calculations and defaults, enabling more stable autotuning and memory management across platforms. Overall impact includes reduced memory footprint, higher GPU throughput, and a clearer, test-backed path for CublasLt migration across the stack.

January 2026

30 Commits • 12 Features

Jan 1, 2026

January 2026 recap: Delivered a unified, cross-backend autotuning framework with expanded GPU backend support, enhanced observability, and reliability improvements across Intel-tensorflow/xla, ROCm/tensorflow-upstream, and Intel-tensorflow/tensorflow. Notable work includes consolidating autotuners into a single backend-agnostic pass, enabling RocBLAS, HipBLASLt, and MiOpen backends, migrating autotuner tests for broader backends, and introducing Convolution HLO kind attributes to enable future fusions. These changes accelerate GPU-specific performance tuning, improve debugging and stability, and lay groundwork for HLO fusion migrations.

December 2025

34 Commits • 8 Features

Dec 1, 2025

December 2025 performance summary: Delivered foundational, cross-repo enhancements to accelerate XLA integration and autotuning across ROCm/tensorflow-upstream, Intel-tensorflow/xla, and ROCm/jax. Key features include a DnnSupport refactor with XLA groundwork, autotuner core enhancements with unified backends and improved configurability, and expanded testing/instrumentation for autotuner and GPU backends. Implemented maintainability improvements via DnnSupport cleanup and enhanced logging for FissionBackend. These efforts improved performance discovery, reliability, and multi-backend support (Cublas, CublasLt, CuDNN) while shortening feedback loops through smarter testing strategies.

November 2025

6 Commits • 4 Features

Nov 1, 2025

November 2025 monthly summary focusing on key accomplishments, major enhancements, and business impact. This month centered on delivering GPU-accelerated MIOpen support within XLA:GPU across two major repositories, complemented by documentation to accelerate performance tuning and adoption.

October 2025

10 Commits • 1 Features

Oct 1, 2025

2025-10 monthly summary for unknown-repo focusing on XLA:GPU autotuning enhancements, stability improvements, and default-config coverage. Contributions center on Autotuner configuration, default conv configs, and environment-aware fallbacks, with a targeted removal of obsolete paths to simplify the GPU pipeline. This work strengthens automated performance tuning, improves portability across GPU environments, and reduces risk of misconfiguration in production workflows.

September 2025

18 Commits • 6 Features

Sep 1, 2025

September 2025 performance summary: Focused on autotuning modernization across the Intel-tensorflow/tensorflow and openxla/xla work streams, delivering a unified Autotuner, device-less operation, and GPU AOT/runtime autotuning. This work improves robustness and performance of GEMM/cuDNN paths, enables cache-driven autotuning without a device, and reduces profiling overhead, while addressing a critical Cudnn workspace overflow bug.

August 2025

37 Commits • 10 Features

Aug 1, 2025

August 2025 performance summary focusing on XLA GPU autotuning and GEMM optimization, across openxla/xla, ROCm/tensorflow-upstream, and Intel-tensorflow/tensorflow. Key initiatives centered on delivering a unified GEMM autotuning workflow, strengthening stability, improving observability, and enabling persistent autotuning data storage to accelerate kernel selection and reduce runtime risk. Overall, the team delivered a cohesive autotuning ecosystem across backends, enabling faster, more reliable GEMM performance with reduced risk of memory pressure during initialization and tuning phases.

July 2025

22 Commits • 5 Features

Jul 1, 2025

July 2025 monthly performance snapshot focusing on GPU-accelerated ML workloads across XLA, ROCm, and TensorFlow upstreams. The period delivered stronger autotuning reliability, improved backend compatibility across CUDA/CuBLAS variants, and clearer backend descriptions, translating into fewer runtime failures, faster compilation cycles, and more predictable performance for production workloads and CI validation.

June 2025

25 Commits • 15 Features

Jun 1, 2025

June 2025 performance focused on GPU-centric improvements across ROCm/tensorflow-upstream, ROCm/xla, and openxla/xla. Delivered autotuning enhancements, robustness improvements, and memory profiling enhancements that directly impact performance, reliability, and resource efficiency for GPU workloads. Business value delivered includes faster convolution performance, more stable autotuning workflows, and improved memory management for large models and workloads.

May 2025

48 Commits • 11 Features

May 1, 2025

May 2025 monthly summary: Delivered a comprehensive end-to-end GPU autotuning ecosystem across ROCm/xla and forks, enabling automatic discovery, configuration, and application of optimized kernels for GEMM and fusion workloads. Introduced and stabilized multiple autotuner backends (CuBLAS, CuBLASLt, CustomKernel, cuDNN) and a FissionBackend orchestration that returns BackendConfigs for seamless integration with Compile and ApplyConfig. Refactored RedzoneBuffers for reuse across backends, improving maintainability and tuning accuracy. Strengthened end-to-end flow with ApplyConfig across backends, enabling unified tuning across diverse kernels. Expanded validation to target modern GPUs (gpu_h100) and enhanced error handling for config retrieval using absl::StatusOr, reducing failure modes. This work enhances performance, reliability, and developer productivity, with cross-repo impact in ROCm/xla, ROCm/tensorflow-upstream, Intel-tensorflow/xla, and openxla/xla.

Activity

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Quality Metrics

Correctness90.6%
Maintainability86.0%
Architecture88.0%
Performance82.8%
AI Usage21.6%

Skills & Technologies

Programming Languages

BUILDBazelCC++HLOMarkdownProtoProtoBufPython

Technical Skills

API DesignAPI DevelopmentAPI designAlgorithm optimizationAutotuningAutotuning algorithmsBLASBackend DevelopmentBackend developmentBuffer ManagementBuild SystemBuild System (Bazel)Build System ConfigurationBuild SystemsBuild system configuration

Repositories Contributed To

7 repos

Overview of all repositories you've contributed to across your timeline

ROCm/tensorflow-upstream

May 2025 Jan 2026
7 Months active

Languages Used

C++BUILDProtoPython

Technical Skills

AutotuningBackend DevelopmentBackend developmentC++C++ developmentError Handling

openxla/xla

May 2025 Sep 2025
5 Months active

Languages Used

C++HLOProtoCPython

Technical Skills

AutotuningBackend DevelopmentC++Compiler OptimizationError HandlingGPU Computing

Intel-tensorflow/xla

May 2025 Feb 2026
5 Months active

Languages Used

C++Python

Technical Skills

AutotuningBackend DevelopmentC++ DevelopmentCUDACode OrganizationGPU Computing

Intel-tensorflow/tensorflow

Jul 2025 Feb 2026
5 Months active

Languages Used

C++ProtoBufBazelPythonHLO

Technical Skills

C++C++ developmentCompiler optimizationGPU programmingTensorFlowXLA

ROCm/xla

May 2025 Jun 2025
2 Months active

Languages Used

C++HLOMarkdown

Technical Skills

AutotuningBackend DevelopmentBuild SystemsC++C++ DevelopmentCode Refactoring

unknown-repo

Oct 2025 Oct 2025
1 Month active

Languages Used

C++

Technical Skills

AutotuningAutotuning algorithmsBackend DevelopmentC++C++ developmentCompiler Development

ROCm/jax

Dec 2025 Dec 2025
1 Month active

Languages Used

Python

Technical Skills

CUDAmachine learningperformance optimizationtesting

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