schism-dev/schism
Feb 2025 – Mar 2026
8 Months active
Languages Used
CMakeCmakeDockerfileFortranShellMakefilePythonYAML
Technical Skills
Build System ConfigurationBuild SystemsCC/C++CI/CDCode Maintenance
Carsten Lemmen
PROFILE
Carsten Lemmen
Over eight months, contributed to the schism-dev/schism repository by engineering robust build system enhancements, scientific model integration, and data output improvements. Focused on reproducible development environments, this work introduced Conda-based CMake configurations, Intel MPI support, and CI/CD pipelines to streamline onboarding and release reliability. Addressed cross-platform build issues by refining Makefile logic and macro handling in Fortran, improving FABM and GOTM integration. Delivered CF-compliant unstructured grid output handling with enhanced metadata management using netCDF, and stabilized runtime behavior through defensive programming. Leveraged CMake, Fortran, and Python to improve portability, maintainability, and scientific computing workflows across diverse HPC environments.
Overall Statistics
Feature vs Bugs
56%Features
Repository Contributions
13Total
Bugs
4
Commits
13
Features
5
Lines of code
8,150,196
Activity Months8
Your Network
29 peopleSame Organization
@hereon.de7
Shared Repositories
22
Work History
March 2026
3 Commits
Mar 1, 2026March 2026: Delivered critical robustness and build stability improvements for FABM in schism-dev/schism. Implemented a group of fixes addressing runtime stability and build reliability across platforms. Highlights include safe defaults for non-negative variables, guarding vertical loops against zero kbe, and corrected macro handling for _FABM_MASK_TYPE_ to balance preprocessor directives. These changes reduce crash risk, stabilize CI pipelines, and improve maintainability, enabling smoother development and deployment cycles.
3 Commits
Mar 1, 2026March 2026: Delivered critical robustness and build stability improvements for FABM in schism-dev/schism. Implemented a group of fixes addressing runtime stability and build reliability across platforms. Highlights include safe defaults for non-negative variables, guarding vertical loops against zero kbe, and corrected macro handling for _FABM_MASK_TYPE_ to balance preprocessor directives. These changes reduce crash risk, stabilize CI pipelines, and improve maintainability, enabling smoother development and deployment cycles.
March 2026
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary focusing on the SCHISM workstream. The primary delivery was the unstructured grid output handling (iof_ugrid) feature for SCHISM, enabling robust, CF-compliant data exports and improved metadata management. The work aligns with business goals of interoperability, data quality, and downstream usability for users analyzing SCHISM outputs.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary focusing on the SCHISM workstream. The primary delivery was the unstructured grid output handling (iof_ugrid) feature for SCHISM, enabling robust, CF-compliant data exports and improved metadata management. The work aligns with business goals of interoperability, data quality, and downstream usability for users analyzing SCHISM outputs.
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for schism-dev/schism. Deliverables focused on documentation delivery and repository hygiene, with a stabilizing bug fix in FABM mask handling.
1 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for schism-dev/schism. Deliverables focused on documentation delivery and repository hygiene, with a stabilizing bug fix in FABM mask handling.
October 2025
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 highlights: Build-system enhancements focused on Intel toolchain readiness and GOTM integration. Fixed GOTM build discovery to correctly locate and include GOTM sources in CMake. Introduced a strand@hereon specific CMake configuration to streamline builds for the Intel toolchain, including compiler paths, naming conventions, release flags for Fortran and C, and NetCDF integration. These changes improve build reliability, cross-environment portability, and CI stability, accelerating feature delivery and reducing integration risk.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 highlights: Build-system enhancements focused on Intel toolchain readiness and GOTM integration. Fixed GOTM build discovery to correctly locate and include GOTM sources in CMake. Introduced a strand@hereon specific CMake configuration to streamline builds for the Intel toolchain, including compiler paths, naming conventions, release flags for Fortran and C, and NetCDF integration. These changes improve build reliability, cross-environment portability, and CI stability, accelerating feature delivery and reducing integration risk.
July 2025
1 Commits
Jul 1, 2025July 2025 — Schism: Stabilized FABM masking by introducing a macro guard that activates FABM masking only when _FABM_MASK_TYPE_ is defined, resolving a long-standing undefined _HAS_MASK_ macro error. This reduces compile-time failures and improves cross-configuration builds for schism.
1 Commits
Jul 1, 2025July 2025 — Schism: Stabilized FABM masking by introducing a macro guard that activates FABM masking only when _FABM_MASK_TYPE_ is defined, resolving a long-standing undefined _HAS_MASK_ macro error. This reduces compile-time failures and improves cross-configuration builds for schism.
July 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly work summary for schism-dev/schism. Focused on portability and integration improvements for FABM environments. Delivered SCHISM-FABM portability and include path alignment feature, with conditional compilation of HAS_MASK and corrected placement of the SCHISM driver file within include directories. No major bugs fixed this month. The changes reduce build failures, improve cross-environment compatibility, and accelerate adoption for legacy FABM setups, enhancing deployment reliability and maintainability. Technologies demonstrated include C/C++ conditional compilation, include path management, cross-platform portability strategies, and version-controlled change tracing.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly work summary for schism-dev/schism. Focused on portability and integration improvements for FABM environments. Delivered SCHISM-FABM portability and include path alignment feature, with conditional compilation of HAS_MASK and corrected placement of the SCHISM driver file within include directories. No major bugs fixed this month. The changes reduce build failures, improve cross-environment compatibility, and accelerate adoption for legacy FABM setups, enhancing deployment reliability and maintainability. Technologies demonstrated include C/C++ conditional compilation, include path management, cross-platform portability strategies, and version-controlled change tracing.
April 2025
1 Commits
Apr 1, 2025Delivered a targeted portability fix to ensure FABM library linkage on lib64-based systems, improving cross-platform build reliability for schism. The change stabilizes builds where FABM is installed in a lib64 directory, reducing install-time errors and streamlining deployment across Linux distributions.
1 Commits
Apr 1, 2025Delivered a targeted portability fix to ensure FABM library linkage on lib64-based systems, improving cross-platform build reliability for schism. The change stabilizes builds where FABM is installed in a lib64 directory, reducing install-time errors and streamlining deployment across Linux distributions.
April 2025
February 2025
3 Commits • 1 Features
Feb 1, 2025February 2025 (2025-02) – Schism dev team delivered foundational Development Environment and Build Configuration enhancements for the schism-dev/schism repository, enabling reproducible local builds, Levante-ready MPI integration, and CI/CD alignment. These improvements reduce onboarding time, stabilize developer workflows, and improve release reliability. Key infrastructure work included Conda-based local build support with CMake, Intel MPI/Levante-specific config, standardized NetCDF discovery, and minor logging accuracy improvements.
February 2025
3 Commits • 1 Features
Feb 1, 2025February 2025 (2025-02) – Schism dev team delivered foundational Development Environment and Build Configuration enhancements for the schism-dev/schism repository, enabling reproducible local builds, Levante-ready MPI integration, and CI/CD alignment. These improvements reduce onboarding time, stabilize developer workflows, and improve release reliability. Key infrastructure work included Conda-based local build support with CMake, Intel MPI/Levante-specific config, standardized NetCDF discovery, and minor logging accuracy improvements.
Activity
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Quality Metrics
Correctness87.6%
Maintainability83.0%
Architecture81.6%
Performance77.0%
AI Usage21.6%
Skills & Technologies
Programming Languages
CMakeCmakeDockerfileFortranMakefilePythonShellYAML
Technical Skills
Build System ConfigurationBuild SystemsCC/C++CI/CDCMakeCode MaintenanceConda EnvironmentsDocumentationFortranFortran DevelopmentFortran programmingHigh-Performance ComputingMPIModel Integration
Repositories Contributed To
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