E3SM-Project/E3SM
Oct 2024 – Sep 2025
10 Months active
Languages Used
C++FortranCMakePythonShellYAML
Technical Skills
Atmospheric ModelingFortran (implied by C++ interface)Physics SimulationSoftware EngineeringC++Code Refactoring
tcclevenger
PROFILE
Tcclevenger
Thomas Cleve contributed to the E3SM-Project/E3SM repository by developing and refining core atmospheric modeling infrastructure, focusing on modularity, performance, and maintainability. He engineered features such as selective tracer advection, unified field management across grids, and end-to-end tensor projection, while also modernizing build systems and CI pipelines. His work involved extensive use of C++, Fortran, and CMake, leveraging high-performance computing frameworks like Kokkos to optimize parallel execution. Through careful code refactoring, robust bug fixes, and thoughtful API design, Thomas improved simulation fidelity, data integrity, and codebase stability, demonstrating a deep understanding of scientific computing and software engineering best practices.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
67Total
Bugs
17
Commits
67
Features
26
Lines of code
11,498
Activity Months10
Your Network
168 people
Work History
September 2025
3 Commits • 1 Features
Sep 1, 2025Month: 2025-09 | Repository: E3SM-Project/E3SM Key features delivered: - Flexible C++ standard configuration for EAMxx build: Extended CMakeLists.txt to allow an optional specification of the C++ standard; defaults to C++17 if no standard is set, enabling flexible and compatible build configurations. Major bugs fixed: - C++20 alignment and code style cleanup in SHOC and P3: - Removed default constructors from SHOC and P3 data structures to align with C++20 and prevent aggregate initialization issues. - Applied clang-format to shoc_functions.hpp and p3_functions.hpp for consistent code style. Overall impact and accomplishments: - Improved build configurability and standards compliance; enhanced code quality and maintainability; reduced risk of aggregate initialization issues and enabled easier downstream integration. Technologies/skills demonstrated: - CMake build customization and C++ standard negotiation (C++17/C++20) - Code style enforcement using clang-format - Code maintenance and collaboration with traceable commits (DCO-friendly, clear commit messages)
3 Commits • 1 Features
Sep 1, 2025Month: 2025-09 | Repository: E3SM-Project/E3SM Key features delivered: - Flexible C++ standard configuration for EAMxx build: Extended CMakeLists.txt to allow an optional specification of the C++ standard; defaults to C++17 if no standard is set, enabling flexible and compatible build configurations. Major bugs fixed: - C++20 alignment and code style cleanup in SHOC and P3: - Removed default constructors from SHOC and P3 data structures to align with C++20 and prevent aggregate initialization issues. - Applied clang-format to shoc_functions.hpp and p3_functions.hpp for consistent code style. Overall impact and accomplishments: - Improved build configurability and standards compliance; enhanced code quality and maintainability; reduced risk of aggregate initialization issues and enabled easier downstream integration. Technologies/skills demonstrated: - CMake build customization and C++ standard negotiation (C++17/C++20) - Code style enforcement using clang-format - Code maintenance and collaboration with traceable commits (DCO-friendly, clear commit messages)
September 2025
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for E3SM (repo: E3SM-Project/E3SM). Focused on stabilizing builds and enhancing CI coverage to improve reliability and compatibility with evolving dependencies. Key actions include temporarily disabling a failing MPI test in the DP unit tests to prevent build-time failures while a long-term MPI fix is developed, and adding weekly EAMxx checks against the latest Kokkos develop branch to boost test robustness and early issue detection. This work reduces flaky builds, accelerates feedback, and demonstrates strong CI/DevOps and MPI/CMake proficiency.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for E3SM (repo: E3SM-Project/E3SM). Focused on stabilizing builds and enhancing CI coverage to improve reliability and compatibility with evolving dependencies. Key actions include temporarily disabling a failing MPI test in the DP unit tests to prevent build-time failures while a long-term MPI fix is developed, and adding weekly EAMxx checks against the latest Kokkos develop branch to boost test robustness and early issue detection. This work reduces flaky builds, accelerates feedback, and demonstrates strong CI/DevOps and MPI/CMake proficiency.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary for E3SM: Delivered robustness and maintainability improvements to the SHOC physics module within the E3SM repository. Implemented targeted fixes to prevent floating point exceptions in length-scale calculations and improved readability of the TKE mixing length logic. These changes enhance long-run simulation stability and code health, supporting safer future SHOC enhancements.
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary for E3SM: Delivered robustness and maintainability improvements to the SHOC physics module within the E3SM repository. Implemented targeted fixes to prevent floating point exceptions in length-scale calculations and improved readability of the TKE mixing length logic. These changes enhance long-run simulation stability and code health, supporting safer future SHOC enhancements.
May 2025
April 2025
5 Commits • 3 Features
Apr 1, 2025Month: 2025-04 — Delivered end-to-end tensor projection capability in the EAMxx/HOMME driver, stabilized numerical diagnostics, and modernized GPU-facing heuristics to improve portability and performance across CPU/GPU architectures. The work emphasized business value through more accurate simulations, robust CFL estimates, and improved scalability on accelerator platforms.
April 2025
5 Commits • 3 Features
Apr 1, 2025Month: 2025-04 — Delivered end-to-end tensor projection capability in the EAMxx/HOMME driver, stabilized numerical diagnostics, and modernized GPU-facing heuristics to improve portability and performance across CPU/GPU architectures. The work emphasized business value through more accurate simulations, robust CFL estimates, and improved scalability on accelerator platforms.
March 2025
25 Commits • 10 Features
Mar 1, 2025March 2025 was focused on strengthening performance, stability, and maintainability across the E3SM codebase with a blend of targeted refactors, feature enhancements, and critical bug fixes. The work delivered reduces runtime overhead, preserves API stability, improves tracer/layout correctness, expands advection/parameter handling capabilities, and reinforces overall code quality for future development.
25 Commits • 10 Features
Mar 1, 2025March 2025 was focused on strengthening performance, stability, and maintainability across the E3SM codebase with a blend of targeted refactors, feature enhancements, and critical bug fixes. The work delivered reduces runtime overhead, preserves API stability, improves tracer/layout correctness, expands advection/parameter handling capabilities, and reinforces overall code quality for future development.
March 2025
February 2025
22 Commits • 6 Features
Feb 1, 2025February 2025: Delivered stability, refactoring, and usability improvements for E3SM with a focus on FieldManager, FM integration, and grid handling. Achieved a more robust build, clearer grid/field cloning semantics, and streamlined configuration paths, while laying groundwork for future simplifications and performance improvements.
February 2025
22 Commits • 6 Features
Feb 1, 2025February 2025: Delivered stability, refactoring, and usability improvements for E3SM with a focus on FieldManager, FM integration, and grid handling. Achieved a more robust build, clearer grid/field cloning semantics, and streamlined configuration paths, while laying groundwork for future simplifications and performance improvements.
January 2025
1 Commits • 1 Features
Jan 1, 2025Summary for 2025-01: Delivered Unified Field Manager across grids in the E3SM project, unifying field handling, simplifying group logic, and removing derivation types. This refactor ensures consistent access to subfields across grid types and lays groundwork for cross-grid data workflows, improving data integrity and maintainability across simulations.
1 Commits • 1 Features
Jan 1, 2025Summary for 2025-01: Delivered Unified Field Manager across grids in the E3SM project, unifying field handling, simplifying group logic, and removing derivation types. This refactor ensures consistent access to subfields across grid types and lays groundwork for cross-grid data workflows, improving data integrity and maintainability across simulations.
January 2025
December 2024
5 Commits • 1 Features
Dec 1, 2024Month: 2024-12 — Consolidated performance review for E3SM project. Delivered key features with correctness and efficiency improvements, fixed log-related issues, and enhanced maintainability. Focused on robustness, optimized data handling, and cleaner output across critical components.
December 2024
5 Commits • 1 Features
Dec 1, 2024Month: 2024-12 — Consolidated performance review for E3SM project. Delivered key features with correctness and efficiency improvements, fixed log-related issues, and enhanced maintainability. Focused on robustness, optimized data handling, and cleaner output across critical components.
November 2024
1 Commits • 1 Features
Nov 1, 2024Concise monthly summary for 2024-11 focusing on key business value and technical accomplishments for E3SM. The main deliverable was the IOP forcing mechanism refactor and the introduction of IOPDataManager, enabling better modularity and more accurate assimilation of observational data.
1 Commits • 1 Features
Nov 1, 2024Concise monthly summary for 2024-11 focusing on key business value and technical accomplishments for E3SM. The main deliverable was the IOP forcing mechanism refactor and the introduction of IOPDataManager, enabling better modularity and more accurate assimilation of observational data.
November 2024
October 2024
1 Commits • 1 Features
Oct 1, 2024October 2024: Delivered selective tracer advection capability in SHOC within the E3SM project, enabling precise control of tracer transport and improved physical fidelity in turbulence-affected simulations. Implemented a turbulence_advected flag in add_tracer and configured SHOC to request a specific group of tracers ('turbulence_advected_tracers') rather than the general 'tracers' group. This aligns with the commit af7fdb2893bcba9f51b96c146b52d1bb50c85059 and supports targeted tracer experiments with reproducible results.
October 2024
1 Commits • 1 Features
Oct 1, 2024October 2024: Delivered selective tracer advection capability in SHOC within the E3SM project, enabling precise control of tracer transport and improved physical fidelity in turbulence-affected simulations. Implemented a turbulence_advected flag in add_tracer and configured SHOC to request a specific group of tracers ('turbulence_advected_tracers') rather than the general 'tracers' group. This aligns with the commit af7fdb2893bcba9f51b96c146b52d1bb50c85059 and supports targeted tracer experiments with reproducible results.
Activity
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Quality Metrics
Correctness90.8%
Maintainability91.2%
Architecture89.0%
Performance85.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++CMakeFortranPythonShellYAML
Technical Skills
API DesignAtmospheric ModelingAtmospheric PhysicsBug FixBug FixingBuild System ConfigurationBuild SystemsC++C++ DevelopmentCI/CDClimate ModelingCode CleanupCode FormattingCode MaintenanceCode Modernization
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