IBM/velox
May 2025 – Jun 2025
2 Months active
Languages Used
C++
Technical Skills
C++ DevelopmentPerformance OptimizationLow-Level OptimizationLow-level programmingPerformance optimizationVectorized Operations
Anders Dellien
PROFILE
Anders Dellien
Worked on the IBM/velox repository over a two-month period, focusing on C++ development and low-level performance optimization. Delivered an arithmetic function refactor by switching parameter passing to pass-by-value, which improved benchmark performance and code maintainability. Subsequently, implemented core vector optimizations by introducing unsigned index types in Nulls.h to address sign-extension issues and fusing loops in FlatVector::hashAll to enhance data locality, resulting in roughly double throughput for analytics workloads. The work emphasized vectorized operations and commit-level traceability, laying a foundation for future scalability improvements while maintaining a disciplined approach to code quality and maintainability throughout the process.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
3Total
Bugs
0
Commits
3
Features
2
Lines of code
37
Activity Months2
Your Network
655 peopleSame Organization
@arm.com538
Shared Repositories
117
Work History
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 (IBM/velox): Implemented core vector performance optimizations that directly boost analytics throughput and reduce latency. Key changes include using unsigned index types in Nulls.h to fix sign-extension issues and a loop-fusion of FlatVector::hashAll to improve locality, yielding roughly 2x throughput. These changes enhance scalability for large datasets and improve overall system responsiveness. Commit-level traceability provided via two commits.
2 Commits • 1 Features
Jun 1, 2025June 2025 (IBM/velox): Implemented core vector performance optimizations that directly boost analytics throughput and reduce latency. Key changes include using unsigned index types in Nulls.h to fix sign-extension issues and a loop-fusion of FlatVector::hashAll to improve locality, yielding roughly 2x throughput. These changes enhance scalability for large datasets and improve overall system responsiveness. Commit-level traceability provided via two commits.
June 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 — IBM/velox focused on performance optimization through parameter passing semantics. Implemented pass-by-value for arithmetic function parameters, achieving ~1% improvement on benchmarks. The change involved refactoring Checked Arithmetic functions (commit 1f6941e0ed13513dc4eb4cf6636d0af6dc3ce21d). No critical bugs detected or fixed this month. Overall impact: incremental performance uplift, improved code maintainability, and groundwork for future optimizations.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 — IBM/velox focused on performance optimization through parameter passing semantics. Implemented pass-by-value for arithmetic function parameters, achieving ~1% improvement on benchmarks. The change involved refactoring Checked Arithmetic functions (commit 1f6941e0ed13513dc4eb4cf6636d0af6dc3ce21d). No critical bugs detected or fixed this month. Overall impact: incremental performance uplift, improved code maintainability, and groundwork for future optimizations.
Activity
Loading activity data...
Quality Metrics
Correctness93.4%
Maintainability86.6%
Architecture80.0%
Performance86.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
C++ DevelopmentLow-Level OptimizationLow-level programmingPerformance OptimizationPerformance optimizationVectorized Operations
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline