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David Belanger

PROFILE

David Belanger

David Belanger developed and stabilized advanced GPU test infrastructure within the ROCm/rocm-systems and ROCR-Runtime repositories, focusing on robust Compute Unit masking validation across diverse AMD architectures. He engineered the ExtendedCuMasking test suite using C and C++, shifting from performance-based to correctness-driven validation by directly verifying wave execution on enabled units. David enhanced multi-GPU support with mutex-protected logging and reusable test logic, improving diagnostics and maintainability. He addressed hardware-specific challenges, such as inactive Compute Units and XL GPU configurations, by refactoring mask manipulation and validation logic. His work demonstrated deep expertise in low-level programming, concurrency control, and hardware-aware test automation.

Overall Statistics

Feature vs Bugs

57%Features

Repository Contributions

7Total
Bugs
3
Commits
7
Features
4
Lines of code
1,576
Activity Months4

Work History

October 2025

1 Commits

Oct 1, 2025

October 2025 monthly summary: Key deliverable focused on robustness of GPU masking in ROCm/rocm-systems. Delivered a critical bug fix to ExtendedCuMasking for GPUs with inactive Compute Units, correcting the CU mask adjustments to avoid resource allocation errors and masking inconsistencies. Patch landed under commit 02294e3852d8cd34f9b6deeb1a30e2327cfbb82b as part of 'kfdtest: Fix ExtendedCuMasking on GPUs with inactive CUs (#726)'. This work strengthens stability across devices with partial CU availability and reduces platform risk in production deployments.

February 2025

2 Commits • 1 Features

Feb 1, 2025

February 2025 Monthly Summary: Strengthened the ROCm test suite by delivering expanded ExtendedCuMasking coverage across XL GPU configurations and stabilizing test behavior across hardware variants. In ROCm/rocm-systems, the ExtendedCuMasking tests were refactored to correctly handle XL cards with new helper functions for mask manipulation and validation, along with improved logic for inactive Work Group Processors. In ROCR-Runtime, the ExtendedCuMasking test robustness was enhanced by fixing inactive WGP handling and adjusting CU masks to account for skipped WGPs. These changes collectively improve test reliability, reduce flaky CI results, and extend hardware coverage. Demonstrated technologies include test refactoring, helper function development for mask manipulation, and hardware-configuration aware validation across the ROCm stack.

January 2025

2 Commits • 1 Features

Jan 1, 2025

January 2025 monthly summary focusing on key accomplishments and business impact across ROCm components. Delivered multi-GPU test framework enhancements and stabilization for ExtendedCuMask tests across ROCm/rocm-systems and ROCm/ROCR-Runtime, reducing flaky behavior, accelerating validation, and enabling scalable cross-GPU diagnostics. Key items include integration of mutex-based logging, GPU node annotations, and encapsulation of test logic into reusable functions for cross-GPU execution.

November 2024

2 Commits • 2 Features

Nov 1, 2024

2024-11 monthly performance summary for ROCm development and testing. This period delivered ExtendedCuMasking tests in both rocm-systems and ROCR-Runtime to validate Compute Unit masking correctness across architectures, with a shift from performance-based checks to direct wave-execution validation, improving reliability and cross-architecture coverage.

Activity

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Quality Metrics

Correctness92.8%
Maintainability80.0%
Architecture82.8%
Performance78.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

AssemblyCC++

Technical Skills

Assembly languageCC++Concurrency ControlDebuggingDriver developmentGPU TestingGPU programmingGPU testingHardware interactionLow-level programmingMulti-GPU FrameworkTest AutomationTest automationTesting

Repositories Contributed To

2 repos

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

ROCm/rocm-systems

Nov 2024 Oct 2025
4 Months active

Languages Used

AssemblyC++C

Technical Skills

GPU testingHardware interactionLow-level programmingTest automationConcurrency ControlGPU Testing

ROCm/ROCR-Runtime

Nov 2024 Feb 2025
3 Months active

Languages Used

AssemblyC++C

Technical Skills

Assembly languageDriver developmentGPU testingLow-level programmingConcurrency ControlGPU Testing

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