E3SM-Project/E3SM
Oct 2024 – Jun 2025
6 Months active
Languages Used
cmakeFortranCMakeCC++
Technical Skills
build systemscmakeBug FixingSystem MaintenanceBuild System ConfigurationBug Fix
Benjamin Hillman
PROFILE
Benjamin Hillman
Over six months, Brian Hillman enhanced the E3SM-Project/E3SM repository by developing and refining high-performance computing build systems and atmospheric modeling features. He implemented machine-specific CMake configurations for diverse HPC environments, including flight, ghost, and Sandia clusters, optimizing for AMD architectures and integrating OpenMP and MPI. Using C++ and Fortran, Brian improved radiation modeling by adding new diagnostic fields and ensuring restart consistency, while also addressing build reliability and test determinism. His work streamlined configuration management, reduced platform setup time, and improved reproducibility, demonstrating depth in scientific computing, system configuration, and rigorous test-driven development across complex climate modeling workflows.
Overall Statistics
Feature vs Bugs
57%Features
Repository Contributions
12Total
Bugs
3
Commits
12
Features
4
Lines of code
182
Activity Months6
Your Network
168 people
Work History
June 2025
5 Commits • 2 Features
Jun 1, 2025June 2025 (2025-06) performance summary for E3SM: Key features delivered: - RRTMGPRadiation: Added cosine_solar_zenith_angle field with proper initialization, fill-value handling, and restart-consistency. Tests extended to verify behavior across radiation steps, including diagnostic output and restart scenarios. Commits: f4fb192e93684d95304351f3b4add906401de87f; fe191fcc1d3654a8f5382a8f7227843c997833ff; 38bd1c8b0d7cdc6cf40e99f4f2eef094850b6001; 8e567e6173746ced03c0b0648349c5e1c03c4821 - Build system support for ghost machine: Added a new CMake configuration enabling building EAMXX on ghost, including path, AMD, OpenMP/MPI settings. Commit: ac269225d2cbae8137f2f6de0a30e82fd63903dc Major bugs fixed: - Test reliability and determinism: Diagnostic tests now set the radiation_ran flag to ensure deterministic outputs. Commit: 8e567e6173746ced03c0b0648349c5e1c03c4821 - Standalone test accuracy: Tests updated to verify rad_heating_pdel instead of sw_flux for standalone scenarios, improving correctness of validation. Commit: 38bd1c8b0d7cdc6cf40e99f4f2eef094850b6001 - Expanded fillvalue handling: Additional fields required fillvalues were added to ensure consistent data availability across steps. Commit: fe191fcc1d3654a8f5382a8f7227843c997833ff Overall impact and accomplishments: - Increased reliability and portability of the E3SM radiation and build subsystems, reducing validation gaps across radiation steps and machine environments. The ghost-enabled build config improves cross-machine deployment readiness for future HPC runs and collaborations. - Enhanced data availability and restart-consistent outputs in radiation modeling, supporting more robust science conclusions from long-running simulations. Technologies/skills demonstrated: - HPC build systems: CMake-based multi-machine configuration (ghost) and OpenMP/MPI integration. - Radiation physics integration: RRTMGPRadiation field enhancements, initialization, fill-value semantics, restart behavior, and related tests. - Test-driven validation: Expanded field coverage, diagnostic test improvements, and corrected validation checks (rad_heating_pdel vs sw_flux). - Version control discipline: Clear commit history annotations guiding traceability of feature work and test fixes.
5 Commits • 2 Features
Jun 1, 2025June 2025 (2025-06) performance summary for E3SM: Key features delivered: - RRTMGPRadiation: Added cosine_solar_zenith_angle field with proper initialization, fill-value handling, and restart-consistency. Tests extended to verify behavior across radiation steps, including diagnostic output and restart scenarios. Commits: f4fb192e93684d95304351f3b4add906401de87f; fe191fcc1d3654a8f5382a8f7227843c997833ff; 38bd1c8b0d7cdc6cf40e99f4f2eef094850b6001; 8e567e6173746ced03c0b0648349c5e1c03c4821 - Build system support for ghost machine: Added a new CMake configuration enabling building EAMXX on ghost, including path, AMD, OpenMP/MPI settings. Commit: ac269225d2cbae8137f2f6de0a30e82fd63903dc Major bugs fixed: - Test reliability and determinism: Diagnostic tests now set the radiation_ran flag to ensure deterministic outputs. Commit: 8e567e6173746ced03c0b0648349c5e1c03c4821 - Standalone test accuracy: Tests updated to verify rad_heating_pdel instead of sw_flux for standalone scenarios, improving correctness of validation. Commit: 38bd1c8b0d7cdc6cf40e99f4f2eef094850b6001 - Expanded fillvalue handling: Additional fields required fillvalues were added to ensure consistent data availability across steps. Commit: fe191fcc1d3654a8f5382a8f7227843c997833ff Overall impact and accomplishments: - Increased reliability and portability of the E3SM radiation and build subsystems, reducing validation gaps across radiation steps and machine environments. The ghost-enabled build config improves cross-machine deployment readiness for future HPC runs and collaborations. - Enhanced data availability and restart-consistent outputs in radiation modeling, supporting more robust science conclusions from long-running simulations. Technologies/skills demonstrated: - HPC build systems: CMake-based multi-machine configuration (ghost) and OpenMP/MPI integration. - Radiation physics integration: RRTMGPRadiation field enhancements, initialization, fill-value semantics, restart behavior, and related tests. - Test-driven validation: Expanded field coverage, diagnostic test improvements, and corrected validation checks (rad_heating_pdel vs sw_flux). - Version control discipline: Clear commit history annotations guiding traceability of feature work and test fixes.
June 2025
May 2025
1 Commits
May 1, 2025May 2025 monthly summary for E3SM project: Focused on stabilizing Sandia HPC runs by implementing a dedicated environment/configuration fix addressing Sandia-specific module/path issues. The commit ac94f327b423033168642193604f76a639b0e5f1 fixes for Sandia machines. Result: more reliable E3SM execution on Sandia clusters, reduced debugging time, and smoother integration with existing build/test pipelines.
May 2025
1 Commits
May 1, 2025May 2025 monthly summary for E3SM project: Focused on stabilizing Sandia HPC runs by implementing a dedicated environment/configuration fix addressing Sandia-specific module/path issues. The commit ac94f327b423033168642193604f76a639b0e5f1 fixes for Sandia machines. Result: more reliable E3SM execution on Sandia clusters, reduced debugging time, and smoother integration with existing build/test pipelines.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for E3SM development focusing on Flight and Boca Configuration Management Enhancements within the E3SM repository. Delivered fixes for incorrect project ID usage in flight/boca configurations and streamlined the build system by removing redundant environment-dependent CMake macro settings, instead relying on environment variables/defaults for MPI, NetCDF, and PnetCDF. These changes improve data processing reliability, job submission correctness, and build reproducibility across environments.
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for E3SM development focusing on Flight and Boca Configuration Management Enhancements within the E3SM repository. Delivered fixes for incorrect project ID usage in flight/boca configurations and streamlined the build system by removing redundant environment-dependent CMake macro settings, instead relying on environment variables/defaults for MPI, NetCDF, and PnetCDF. These changes improve data processing reliability, job submission correctness, and build reproducibility across environments.
February 2025
January 2025
2 Commits
Jan 1, 2025January 2025 monthly summary for E3SM repository focusing on build-system reliability and cross-component consistency. Delivered a targeted build configuration fix across p3, shoc, and pam by correcting the incorrect SCREAM_LIBS_ONLY usage in CMakeLists and replacing it with SCREAM_LIB_ONLY to restore proper build configurations. This work unblocked CI and ensured stable, reproducible builds across core components.
January 2025
2 Commits
Jan 1, 2025January 2025 monthly summary for E3SM repository focusing on build-system reliability and cross-component consistency. Delivered a targeted build configuration fix across p3, shoc, and pam by correcting the incorrect SCREAM_LIBS_ONLY usage in CMakeLists and replacing it with SCREAM_LIB_ONLY to restore proper build configurations. This work unblocked CI and ensured stable, reproducible builds across core components.
November 2024
1 Commits
Nov 1, 2024November 2024 monthly summary for the E3SM repository focused on stabilization work in SEMS after recent modifications. No new features were introduced this month; the primary delivery was a targeted bug fix to restore SEMS stability and prevent disruption to downstream workflows.
1 Commits
Nov 1, 2024November 2024 monthly summary for the E3SM repository focused on stabilization work in SEMS after recent modifications. No new features were introduced this month; the primary delivery was a targeted bug fix to restore SEMS stability and prevent disruption to downstream workflows.
November 2024
October 2024
1 Commits • 1 Features
Oct 1, 2024Month 2024-10 summary: Implemented Flight HPC environment support in the E3SM repository. Added a dedicated CMake configuration for the flight machine, including AMD architecture optimizations and OpenMP settings, and enabled srun-based standalone testing to allow building and running EAMXX on flight. The change reduces platform setup time, standardizes HPC testing, and accelerates validation on the flight system.
October 2024
1 Commits • 1 Features
Oct 1, 2024Month 2024-10 summary: Implemented Flight HPC environment support in the E3SM repository. Added a dedicated CMake configuration for the flight machine, including AMD architecture optimizations and OpenMP settings, and enabled srun-based standalone testing to allow building and running EAMXX on flight. The change reduces platform setup time, standardizes HPC testing, and accelerates validation on the flight system.
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Quality Metrics
Correctness88.4%
Maintainability88.4%
Architecture81.6%
Performance76.6%
AI Usage21.6%
Skills & Technologies
Programming Languages
CC++CMakeFortrancmake
Technical Skills
Atmospheric ModelingBug FixBug FixingBuild System ConfigurationC++Climate ModelingConfiguration ManagementData HandlingHigh-Performance ComputingPhysicsPhysics SimulationRadiation ModelingScientific ComputingSoftware DevelopmentSystem Configuration
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