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Mathias Anselmann

PROFILE

Mathias Anselmann

Mathias Anselmann contributed to the dealii/dealii and spack/spack-packages repositories by enhancing distributed data output, improving build reliability, and addressing code quality. He developed robust support for distributed vectors in DataOut, generalized parallel I/O to handle arbitrary ownership layouts, and improved interoperability with PETSc and Trilinos. Using C++ and Python, Mathias applied advanced concepts such as template metaprogramming, type traits, and C++20 modules to increase maintainability and flexibility. He also resolved build failures in spack-packages by explicitly linking the math library, ensuring cross-toolchain compatibility. His work demonstrated depth in build systems, parallel computing, and software maintenance.

Overall Statistics

Feature vs Bugs

57%Features

Repository Contributions

11Total
Bugs
3
Commits
11
Features
4
Lines of code
1,489
Activity Months3

Work History

February 2026

1 Commits

Feb 1, 2026

Month: 2026-02 — Key achievements include delivering a stability-focused fix to ensure math library linking across newer toolchains in spack/spack-packages, reducing build-time failures and improving portability of math functions such as sin(). The change explicitly links libm, addressing 'DSO missing from command line' errors and making builds robust across toolchains. Impact: smoother CI pipelines, fewer flaky builds, and a stronger foundation for cross-compiler compatibility. Technologies demonstrated: C/C++, linker flags, GNU toolchain behavior, Spack packaging practices, commit-driven development.

January 2026

3 Commits • 1 Features

Jan 1, 2026

January 2026 (2026-01) monthly summary for dealii/dealii: focused on code quality improvements and distributed I/O generalization. Delivered a code cleanliness fix removing an unnecessary semicolon, eliminating a pedantic warning and aligning with coding standards. Generalized DataOut to handle parallel vectors with arbitrary ownership layouts for distributed output robustness, including exporting std::void_t to enhance type-trait capabilities. These changes improve maintainability, reduce warning noise for developers, and enable more flexible, robust parallel I/O in the library. Key commits include 9fa6234fdba1c853b156a90b24b117ee4f5e046f, 44f1c0c630a3fb1d2575d95f530b823d4f8d1951, and a8c55d3ed170fd14233b4d0ea9c827eb8da73355f.

December 2025

7 Commits • 3 Features

Dec 1, 2025

Month: 2025-12 — Focused on delivering robust data I/O improvements, improved distributed vector handling, and build reliability for dealii/dealii. Key outcomes include DataOut enhancements with ReadWriteVector support, PETSc BlockVector support in imports, enabling VectorTools evaluation on ReadWriteVector under C++20 concepts, improved ghosted Trilinos vector handling, and code formatting for maintainability. These changes enhance data reliability, interoperability with PETSc/ Trilinos, and build stability across toolchains.

Activity

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Quality Metrics

Correctness94.6%
Maintainability89.2%
Architecture92.8%
Performance91.0%
AI Usage21.8%

Skills & Technologies

Programming Languages

C++Python

Technical Skills

C++C++ developmentC/C++ integrationLLVM integrationNumerical MethodsNumerical methodsParallel ComputingParallel computingalgorithm designbuild systemscode formattingcode quality improvementconcepts in C++data structuresdistributed computing

Repositories Contributed To

2 repos

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

dealii/dealii

Dec 2025 Jan 2026
2 Months active

Languages Used

C++

Technical Skills

C++C++ developmentLLVM integrationNumerical MethodsNumerical methodsParallel Computing

spack/spack-packages

Feb 2026 Feb 2026
1 Month active

Languages Used

Python

Technical Skills

C/C++ integrationbuild systemspackage management