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Mathias Anselmann

PROFILE

Mathias Anselmann

Over a three-month period, contributed to dealii/dealii and spack/spack-packages by enhancing distributed data output, improving build reliability, and refining code quality. Focused on C++ and Python, the work included generalizing DataOut to support parallel vectors with arbitrary ownership, integrating PETSc and Trilinos vector support, and exporting type traits for greater flexibility. Addressed build failures by explicitly linking the math library in Spack, ensuring compatibility across toolchains and reducing CI instability. Emphasized maintainability through code formatting and removal of pedantic warnings, while documenting build-system changes to support future maintenance and robust cross-compiler development workflows.

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