boutproject/hermes-3
Apr 2025 – Apr 2026
13 Months active
Languages Used
PythonYAMLCC++CMakeGitBashGit configuration
Technical Skills
Build System ConfigurationDependency ManagementSoftware PackagingAPI DevelopmentBuild SystemsC++
Owen Parry
PROFILE
Owen Parry
Worked on the boutproject/hermes-3 repository, delivering a modular plasma simulation framework focused on reaction modeling and scientific computing. Over 13 months, developed 84 features and resolved 34 bugs, emphasizing C++ development, build automation, and robust testing. Unified disparate reaction implementations under a hermes::ReactionBase API, enabling scalable extension and maintainability. Enhanced build reliability using CMake, Docker, and Spack, and improved CI/CD pipelines for reproducible environments. Advanced data handling and diagnostics, expanded regression test coverage, and streamlined onboarding through comprehensive documentation and code refactoring. The work resulted in a maintainable, extensible codebase supporting high-fidelity, cross-platform plasma physics simulations.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
260Total
Bugs
34
Commits
260
Features
84
Lines of code
883,505
Activity Months13
Your Network
22 peopleSame Organization
@ukaea.uk11
Shared Repositories
11
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026Implemented Hermes ReactionBase Refactor and Modularization in boutproject/hermes-3 (April 2026). Replaced disparate reaction implementations with a unified hermes::ReactionBase-based API, standardizing interfaces and shared functionality. This groundwork enables scalable addition of new reaction types while reducing maintenance costs and onboarding time for the team.
1 Commits • 1 Features
Apr 1, 2026Implemented Hermes ReactionBase Refactor and Modularization in boutproject/hermes-3 (April 2026). Replaced disparate reaction implementations with a unified hermes::ReactionBase-based API, standardizing interfaces and shared functionality. This groundwork enables scalable addition of new reaction types while reducing maintenance costs and onboarding time for the team.
April 2026
March 2026
25 Commits • 5 Features
Mar 1, 2026March 2026 (2026-03) – Hermes-3: Documentation and developer experience improvements, API clarity, performance, and stability enhancements, with targeted bug fixes to improve reliability and onboarding. Key outcomes: - Documentation and developer experience: Reactions docs overhaul with doxygen pickup, label consistency, and alignment between the dev manual and user docs; development manual enhancements; HCX doxygen readability improvements; new diagnostics subsection. - Build and environment stability: Switched Hermes-3 builder docker image to Spack develop to avoid PETSc/sundials issues. - Performance and API improvements: RateHelper refactor to use a single Ind3D and inlined functions; Reaction::update_sources parameter naming clarified. - Dev documentation: Executive summary, dedicated stoichiometry subsection, and code blocks in the dev manual. - Regression tests and quality: Tests updated to reflect reaction framework changes, including zeroing reaction density sources in guard cells; formatting and test tolerance adjustments. Major bugs fixed: - Skip electron energy calculation for HCX when zero terms were produced. - Guard against division by zero in RateHelper::compute_collision_freq_density. - Zero reaction density sources handling guards. - Remove redundant temporary fields; tidy up Reaction::transform_impl. - Regression tests adjusted to reaction framework changes; formatting fixes applied. Business impact: - More reliable simulations, reduced edge-case failures, faster onboarding due to clearer docs and APIs, and a leaner, more maintainable codebase. Technologies/skills demonstrated: - C++ performance and API refactoring, doxygen-based documentation, Docker/Spack build configurations, regression testing, and documentation craftsmanship.
March 2026
25 Commits • 5 Features
Mar 1, 2026March 2026 (2026-03) – Hermes-3: Documentation and developer experience improvements, API clarity, performance, and stability enhancements, with targeted bug fixes to improve reliability and onboarding. Key outcomes: - Documentation and developer experience: Reactions docs overhaul with doxygen pickup, label consistency, and alignment between the dev manual and user docs; development manual enhancements; HCX doxygen readability improvements; new diagnostics subsection. - Build and environment stability: Switched Hermes-3 builder docker image to Spack develop to avoid PETSc/sundials issues. - Performance and API improvements: RateHelper refactor to use a single Ind3D and inlined functions; Reaction::update_sources parameter naming clarified. - Dev documentation: Executive summary, dedicated stoichiometry subsection, and code blocks in the dev manual. - Regression tests and quality: Tests updated to reflect reaction framework changes, including zeroing reaction density sources in guard cells; formatting and test tolerance adjustments. Major bugs fixed: - Skip electron energy calculation for HCX when zero terms were produced. - Guard against division by zero in RateHelper::compute_collision_freq_density. - Zero reaction density sources handling guards. - Remove redundant temporary fields; tidy up Reaction::transform_impl. - Regression tests adjusted to reaction framework changes; formatting fixes applied. Business impact: - More reliable simulations, reduced edge-case failures, faster onboarding due to clearer docs and APIs, and a leaner, more maintainable codebase. Technologies/skills demonstrated: - C++ performance and API refactoring, doxygen-based documentation, Docker/Spack build configurations, regression testing, and documentation craftsmanship.
February 2026
29 Commits • 3 Features
Feb 1, 2026February 2026 highlights for boutproject/hermes-3: Delivered documentation and tooling enhancements, improved build stability, and upgraded infrastructure, resulting in clearer onboarding, more reliable CI, and a cleaner codebase.
29 Commits • 3 Features
Feb 1, 2026February 2026 highlights for boutproject/hermes-3: Delivered documentation and tooling enhancements, improved build stability, and upgraded infrastructure, resulting in clearer onboarding, more reliable CI, and a cleaner codebase.
February 2026
January 2026
18 Commits • 2 Features
Jan 1, 2026January 2026: Delivered substantial reliability and reproducibility improvements in boutproject/hermes-3, focusing on testing and build infrastructure to accelerate feedback and onboarding. The month delivered two major features with enhanced diagnostics and packaging improvements, plus improved failure visibility and traceability across the CI/build pipeline.
January 2026
18 Commits • 2 Features
Jan 1, 2026January 2026: Delivered substantial reliability and reproducibility improvements in boutproject/hermes-3, focusing on testing and build infrastructure to accelerate feedback and onboarding. The month delivered two major features with enhanced diagnostics and packaging improvements, plus improved failure visibility and traceability across the CI/build pipeline.
December 2025
18 Commits • 4 Features
Dec 1, 2025December 2025 performance summary for boutproject/hermes-3. Delivered expanded simulation capabilities and robust testing infrastructure, driving higher fidelity physics, faster feedback, and smoother onboarding for dependencies.
18 Commits • 4 Features
Dec 1, 2025December 2025 performance summary for boutproject/hermes-3. Delivered expanded simulation capabilities and robust testing infrastructure, driving higher fidelity physics, faster feedback, and smoother onboarding for dependencies.
December 2025
November 2025
9 Commits • 2 Features
Nov 1, 2025November 2025: Delivered cross-platform validation and build reliability improvements for Hermes-3. Enhanced the D-T-He 1D recycling test suite with regression coverage, cross-compiler tolerance adjustments, enhanced diagnostics, and unified reference data. Strengthened the build system with MUMPS support and a hardened Spack workflow, including submodule build-link handling. Clarified diagnostics and stabilized optimized builds to reduce flakiness. Overall impact: higher confidence in cross-platform results, faster CI feedback, and more reproducible deployments.
November 2025
9 Commits • 2 Features
Nov 1, 2025November 2025: Delivered cross-platform validation and build reliability improvements for Hermes-3. Enhanced the D-T-He 1D recycling test suite with regression coverage, cross-compiler tolerance adjustments, enhanced diagnostics, and unified reference data. Strengthened the build system with MUMPS support and a hardened Spack workflow, including submodule build-link handling. Clarified diagnostics and stabilized optimized builds to reduce flakiness. Overall impact: higher confidence in cross-platform results, faster CI feedback, and more reproducible deployments.
October 2025
8 Commits • 3 Features
Oct 1, 2025Month: 2025-10 — Concise monthly summary for boutproject/hermes-3 focusing on business value, robustness, and delivery of core capabilities.
8 Commits • 3 Features
Oct 1, 2025Month: 2025-10 — Concise monthly summary for boutproject/hermes-3 focusing on business value, robustness, and delivery of core capabilities.
October 2025
September 2025
3 Commits • 2 Features
Sep 1, 2025Month: 2025-09 — This period delivered foundational workflow stability and a critical correctness fix in Hermes-3. Key work included (1) stabilizing the build/dev pipeline by merging master into refactor-reactions with updates to Docker configurations, CI workflows, and CMake build scripts, (2) introducing a ReactionBase base class and refactoring reaction components to inherit from it to prevent mismatches between reaction strings and definitions during ongoing refactoring, and (3) correcting the hydrogen charge exchange momentum gain option logic to ensure accurate momentum transfer calculations. The changes collectively improve developer productivity, build reliability, and physical correctness in production-like scenarios.
September 2025
3 Commits • 2 Features
Sep 1, 2025Month: 2025-09 — This period delivered foundational workflow stability and a critical correctness fix in Hermes-3. Key work included (1) stabilizing the build/dev pipeline by merging master into refactor-reactions with updates to Docker configurations, CI workflows, and CMake build scripts, (2) introducing a ReactionBase base class and refactoring reaction components to inherit from it to prevent mismatches between reaction strings and definitions during ongoing refactoring, and (3) correcting the hydrogen charge exchange momentum gain option logic to ensure accurate momentum transfer calculations. The changes collectively improve developer productivity, build reliability, and physical correctness in production-like scenarios.
August 2025
17 Commits • 5 Features
Aug 1, 2025August 2025 focused on strengthening the Hermes-3 data and diagnostic stack, delivering a modular Amjuel data pipeline, a comprehensive Reaction Diagnostics Overhaul, and robust reaction parsing. These changes improve reliability, configurability, and maintainability while enabling more accurate physical modeling and faster onboarding of new data sources.
17 Commits • 5 Features
Aug 1, 2025August 2025 focused on strengthening the Hermes-3 data and diagnostic stack, delivering a modular Amjuel data pipeline, a comprehensive Reaction Diagnostics Overhaul, and robust reaction parsing. These changes improve reliability, configurability, and maintainability while enabling more accurate physical modeling and faster onboarding of new data sources.
August 2025
July 2025
57 Commits • 34 Features
Jul 1, 2025July 2025 performance summary for boutproject/hermes-3: Delivered momentum source functionality and expanded regression testing coverage, enabling more realistic simulations and robust QA. Implemented tolerance-based regression comparisons for significant digits, added regression tests for Helium ionization and recombination, and extended regression test data with collision frequencies to better validate physics under varied conditions. Updated test fixtures and refactored core components to improve reliability, diagnostics, and maintainability, including generalisation of Reaction::transform with momentum/energy splitting factors and enhancements to RateHelper and ReactionParser. These changes collectively improve model fidelity, reduce regression risk, and accelerate development cycles.
July 2025
57 Commits • 34 Features
Jul 1, 2025July 2025 performance summary for boutproject/hermes-3: Delivered momentum source functionality and expanded regression testing coverage, enabling more realistic simulations and robust QA. Implemented tolerance-based regression comparisons for significant digits, added regression tests for Helium ionization and recombination, and extended regression test data with collision frequencies to better validate physics under varied conditions. Updated test fixtures and refactored core components to improve reliability, diagnostics, and maintainability, including generalisation of Reaction::transform with momentum/energy splitting factors and enhancements to RateHelper and ReactionParser. These changes collectively improve model fidelity, reduce regression risk, and accelerate development cycles.
June 2025
56 Commits • 17 Features
Jun 1, 2025June 2025 performance highlights for boutproject/hermes-3: Implemented a Spack-based build and submodule workflow for Hermes/BOUT, including a dedicated wrapper, submodule alignment, and cleanup tooling, enabling reproducible, container-friendly development and simplified onboarding. Cleaned Hermes-3 build and runtime dependencies by migrating build-time usage to numpy and removing unnecessary runtime deps, and aligned the checked-out version label to 'develop'. Advanced documentation and build process improvements, including renaming Doxygen target, making docs targets PHONY, defaulting builds to HTML, and enhancing LaTeX/doc outputs; improved Spack installation docs per feedback. Environment and automation enhancements were introduced: automatic environment view loading on activation, inclusion of cmake in the env spec, and automated build-link maintenance post-Spack operations, which speeds up iteration cycles. Several stability and reliability improvements were delivered: Reaction system refactor to move Amjuel reactions up to Reaction, fix for Reaction::transform, test-state enhancements (reaction string), and targeted bug fixes (logn->ln, input state for Izn, submodule path). Additionally, repository organization was refined by relocating the BOUT-spack submodule under external for clearer separation and future reuse. These changes collectively reduce setup time, improve build reliability, and enable more rigorous testing and diagnostics, delivering business value through faster delivery of scientific results and lower maintenance overhead.
56 Commits • 17 Features
Jun 1, 2025June 2025 performance highlights for boutproject/hermes-3: Implemented a Spack-based build and submodule workflow for Hermes/BOUT, including a dedicated wrapper, submodule alignment, and cleanup tooling, enabling reproducible, container-friendly development and simplified onboarding. Cleaned Hermes-3 build and runtime dependencies by migrating build-time usage to numpy and removing unnecessary runtime deps, and aligned the checked-out version label to 'develop'. Advanced documentation and build process improvements, including renaming Doxygen target, making docs targets PHONY, defaulting builds to HTML, and enhancing LaTeX/doc outputs; improved Spack installation docs per feedback. Environment and automation enhancements were introduced: automatic environment view loading on activation, inclusion of cmake in the env spec, and automated build-link maintenance post-Spack operations, which speeds up iteration cycles. Several stability and reliability improvements were delivered: Reaction system refactor to move Amjuel reactions up to Reaction, fix for Reaction::transform, test-state enhancements (reaction string), and targeted bug fixes (logn->ln, input state for Izn, submodule path). Additionally, repository organization was refined by relocating the BOUT-spack submodule under external for clearer separation and future reuse. These changes collectively reduce setup time, improve build reliability, and enable more rigorous testing and diagnostics, delivering business value through faster delivery of scientific results and lower maintenance overhead.
June 2025
May 2025
17 Commits • 4 Features
May 1, 2025May 2025 highlights for boutproject/hermes-3: Delivered data-driven reaction modeling, parser robustness, solver configurability, and packaging hygiene to improve simulation fidelity, configurability, and deployment reliability. Key outcomes include JSON-driven Amjuel coefficients and hydrogen isotope data, a new ReactionParser with helper functions for stoichiometry, configurable Hermes slope limiters, and comprehensive packaging updates.
May 2025
17 Commits • 4 Features
May 1, 2025May 2025 highlights for boutproject/hermes-3: Delivered data-driven reaction modeling, parser robustness, solver configurability, and packaging hygiene to improve simulation fidelity, configurability, and deployment reliability. Key outcomes include JSON-driven Amjuel coefficients and hydrogen isotope data, a new ReactionParser with helper functions for stoichiometry, configurable Hermes slope limiters, and comprehensive packaging updates.
April 2025
2 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for boutproject/hermes-3. Focused on enabling parallel scientific computing and establishing a reproducible development environment to improve build reliability and onboarding. No major bug fixes reported this month; the work centered on feature delivery and infrastructure improvements that lay groundwork for production-grade simulations. Key outcomes across Hermes-3: - PETSc integration in Hermes-3 build to enable parallel computational workflows when built with GCC. - Spack-based reproducible environment defining Hermes-3, XHermes, XBout, and Python dependencies to ensure consistent builds across development and CI. Business value: - Accelerated setup and reduced
2 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for boutproject/hermes-3. Focused on enabling parallel scientific computing and establishing a reproducible development environment to improve build reliability and onboarding. No major bug fixes reported this month; the work centered on feature delivery and infrastructure improvements that lay groundwork for production-grade simulations. Key outcomes across Hermes-3: - PETSc integration in Hermes-3 build to enable parallel computational workflows when built with GCC. - Spack-based reproducible environment defining Hermes-3, XHermes, XBout, and Python dependencies to ensure consistent builds across development and CI. Business value: - Accelerated setup and reduced
April 2025
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Quality Metrics
Correctness92.8%
Maintainability91.8%
Architecture90.2%
Performance86.2%
AI Usage20.4%
Skills & Technologies
Programming Languages
BashCC++CMakeDockerfileGitGit configurationJSONMakefileMarkdown
Technical Skills
API DevelopmentBOUT++Bug FixBug FixingBuild AutomationBuild ConfigurationBuild SystemBuild System ConfigurationBuild System ManagementBuild SystemsBuild ToolsC++C++ DevelopmentC++ developmentCI/CD
Repositories Contributed To
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