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Kim Liegeois

PROFILE

Kim Liegeois

Kim Liegeois contributed to high-performance GPU computing projects, focusing on ROCm/rocm-libraries and related repositories. Over seven months, Kim engineered benchmarking infrastructure, streamlined build systems, and enhanced test reliability for sparse linear algebra libraries. Using C++, CMake, and Python, Kim refactored timing instrumentation for HIP streams, introduced device-side initialization to improve performance, and added new algorithm options such as nnzsplit for SpMV. Kim’s work addressed build robustness, error handling, and test flakiness, while also expanding ROCm-backed testing in PyTorch. These efforts resulted in more reliable CI pipelines, faster development cycles, and improved validation of hardware-accelerated machine learning workloads.

Overall Statistics

Feature vs Bugs

50%Features

Repository Contributions

26Total
Bugs
8
Commits
26
Features
8
Lines of code
3,673
Activity Months7

Work History

January 2026

3 Commits • 1 Features

Jan 1, 2026

January 2026: Focused on expanding ROCm-backed testing coverage and aligning deployment/documentation for PyTorch and ROCm JAX. Key work delivered improved validation for ROCm-enabled paths, reduced test gaps for half and bfloat16 data types, and corrected deployment guidance to reduce user confusion. The month reinforced cross-project reliability and business value by ensuring robust, faster validation of hardware-accelerated workloads and clearer guidelines for users.

October 2025

2 Commits • 1 Features

Oct 1, 2025

Month: 2025-10 | Repository: ROCm/rocm-libraries. Key feature delivered this month: client-only build option for rocSPARSE and hipSPARSE, enabling lighter builds focused on client components (samples, tests, benchmarks) without compiling the core library. Implemented via a --clients-only option in installation scripts and the CMake build system, with parity across both rocSPARSE and hipSPARSE. Commits: - 1d70d630ea69e984cfaa0ec73c2d914ec797b9b2: [rocsparse] add the option to only build clients (#1924) - ef7c0dc87312298e526fcdc8b878407f5d9cbfd0: [hipsparse] add the option to only build clients (#1925) Impact and business value: - Reduces build times and resource usage by allowing client-only workflows, speeding up development, testing, and CI validation of client components. - Improves feedback cycles for client-facing features and benchmarks, enabling quicker iterations. Technologies/skills demonstrated: - Build system customization with CMake and installation scripts - Cross-repo coordination and parity (rocSPARSE and hipSPARSE) - Change management and traceability via commit messages Note: No major bugs fixed this month.

September 2025

5 Commits • 2 Features

Sep 1, 2025

During Sep 2025, the ROCm/rocm-libraries team delivered key stability and performance improvements in ROCSPARSE, introduced a new SpMV nnzsplit algorithm option, and streamlined the benchmarking workflow. Notable work includes consolidating stability fixes for bsrsm rounding, CSR race condition on gfx950 after radix sort, and hipFree synchronization to ensure correct memory management, plus enabling nnzsplit SPMV and updating internal structures. The benchmarking API was simplified by removing ROCSPARSE_CLIENTS_RUN_BENCHMARK macro in favor of rocsparse_clients::run_benchmark. These changes improve reliability, broaden functionality, and reduce maintenance overhead.

August 2025

4 Commits • 1 Features

Aug 1, 2025

August 2025 Monthly Summary for StreamHPC/rocm-libraries: Delivered performance and precision improvements, build system hardening, and test stability across architectures. Key outcomes include device-side zero-initialization for wg_flags to avoid host allocations and memcpy, an integer-valued matrix initialization option (use_exact) for improved precision, explicit rocPRIM version handling to prevent build failures, and stabilized spmm tests on bmwcra_1 via convert_to_int and zero tolerance.

July 2025

4 Commits • 2 Features

Jul 1, 2025

July 2025 monthly summary for StreamHPC/rocm-libraries focused on strengthening test reliability, incremental-build stability, and aligning development direction with hipSPARSE. Delivered targeted test-suite enhancements for RocSPARSE, stabilized header handling across configure/build phases, and updated developer guidance to steer new work toward hipSPARSE while preserving RocSPARSE as a reference for specialized functionality. These results reduce debugging time, improve release confidence, and clarify the platform strategy for future work.

June 2025

7 Commits • 1 Features

Jun 1, 2025

June 2025 monthly summary for ROCm/rocSPARSE focusing on business value and technical achievements. Key features delivered: - Benchmarking and HIP timer overhaul: Centralized benchmarking/timing infrastructure, removal of ROCSPARSE_CLIENTS_RUN_BENCHMARK macro in favor of run_benchmark; HIP stream aware timing updated to use hipStream_t; timer class refactored to manage streams internally; benchmarking macro reintroduced with input validation and median GPU execution time computation across iterations. - Notable commits: c2cc1fe277b7b26b4f03569162248264efaf1329; 969b4a6ca4ffc6c447e88837cd9bde28b20e9488; 50310856b1e0c1b2c4e9d2dc7cdf429469771306; 00a4332fc6dbbd34ba0e1189999ee2d149d1cd98. - Build robustness and error handling improvements: Strengthened build reliability by removing flaky ROCSPARSE_CHECK macros around rocsparse_create_handle and rocsparse_get_stream; added explicit error checking for rocsparse_get_stream to ensure proper error reporting. - Notable commits: fe8d2d6911546127f5b37c8f732d9a5aca764c77; dea25162299dec9621ce21d4afff1ed7f5c10fc9. - Test stability improvement for spmm level3: Relaxed tolerance and introduced a new tolerance parameter (tolm = 5.0) to reduce nightly test flakiness while preserving result validity. - Notable commit: 4af43cfe20b68ad00ad9b4c4a351704cfe20b68ad00ad9b4c4a351704eb30d0f02. Major bugs fixed: - Fixed compilation issues and improved error reporting around handle/stream initialization by removing flaky ROCSPARSE_CHECK macros and adding explicit error checks (commits listed above). - Reduced nightly test flakiness for spmm level3 by adjusting test tolerance parameter, improving CI stability. Overall impact and accomplishments: - Improved benchmarking accuracy and reliability, enabling more precise performance analysis and faster optimization cycles. - Significantly more robust build and error reporting, reducing pipeline failures and enabling quicker triage. - Enhanced test stability for critical paths (spmm level3), reducing flaky nightly results and improving confidence in regression checks. - Demonstrated end-to-end technical proficiency across C++/HIP, ROCm APIs, benchmarking instrumentation, and test strategy. Technologies and skills demonstrated: - C++/HIP, ROCm, GPU benchmarking, and stream-aware timing instrumentation. - Build system hardening and explicit error handling patterns. - Test stability engineering, tolerance tuning, and robust validation. - Macro modernization and careful refactoring to improve maintainability and performance visibility.

March 2025

1 Commits

Mar 1, 2025

Monthly summary for 2025-03 focusing on ROCm/rocm-examples work. Delivered a critical bug fix that ensures correct rocSPARSE computations by zero-initializing the d_y array and replacing an unsafe memory copy with a memset. The work is anchored in the ROCm/rocm-examples repository and involved a targeted fix with commit 7fccdd7359e969e8afe276cd6766aee97d6fa0fe.

Activity

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Quality Metrics

Correctness88.8%
Maintainability86.6%
Architecture83.8%
Performance76.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

CC++CMakeGroovyMarkdownPythonRSTShellYAML

Technical Skills

BenchmarkingBuild System ConfigurationBuild SystemsC++C++ DevelopmentCI/CDCMakeCUDACode RefactoringDevOpsDocumentationError HandlingGPU ComputingGoogle TestHigh-Performance Computing

Repositories Contributed To

6 repos

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

StreamHPC/rocm-libraries

Jul 2025 Aug 2025
2 Months active

Languages Used

C++CMakeMarkdownRSTYAML

Technical Skills

Build SystemsC++C++ DevelopmentCMakeDocumentationGPU Computing

ROCm/rocSPARSE

Jun 2025 Jun 2025
1 Month active

Languages Used

CC++YAML

Technical Skills

BenchmarkingBuild SystemsC++C++ DevelopmentCI/CDCUDA

ROCm/rocm-libraries

Sep 2025 Oct 2025
2 Months active

Languages Used

CC++GroovyYAMLCMakePythonShell

Technical Skills

BenchmarkingBuild SystemsC++CUDACode RefactoringGPU Computing

pytorch/pytorch

Jan 2026 Jan 2026
1 Month active

Languages Used

Python

Technical Skills

CUDAPyTorchPythonmachine learningtesting

ROCm/rocm-examples

Mar 2025 Mar 2025
1 Month active

Languages Used

C++

Technical Skills

CUDAGPU Computing

ROCm/rocm-jax

Jan 2026 Jan 2026
1 Month active

Languages Used

Markdown

Technical Skills

DevOpscontainerizationdocumentation