AliceO2Group/AliceO2
Mar 2024 – Apr 2025
8 Months active
Languages Used
C++
Technical Skills
Algorithm DevelopmentC++Data Analysisdata processingperformance optimizationAlgorithm optimization
Sergey Gorbunov
PROFILE
Sergey Gorbunov
Contributed to the AliceO2Group/AliceO2 repository by developing and optimizing core components of the TPC space-charge correction and calibration pipeline. Leveraging C++ and GPU programming, the work focused on improving the accuracy and efficiency of track residual handling, spline-based corrections, and multithreaded data processing. Enhancements included introducing voxel-map inverse corrections, enforcing calibration bounds, and refactoring data structures for thread safety and maintainability. The developer addressed both feature development and bug fixes, consolidating complex workflows and reducing systematic biases in track reconstruction. Their approach emphasized algorithm optimization, robust calibration, and scalable scientific computing to support high-throughput physics data analysis.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
16Total
Bugs
3
Commits
16
Features
6
Lines of code
8,255
Activity Months8
Your Network
103 peopleSame Organization
@fias.uni-frankfurt.de1
Work History
April 2025
4 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for AliceO2Group/AliceO2 focusing on business value and technical achievements. Delivered enhancements to the TPC space charge correction (SC) calibration pipeline by consolidating four commits into a cohesive feature, resulting in more accurate and efficient corrections. The work includes updates to spline handling and interpolation, a new method for merging SC corrections, and a refactor to operate with direct Y/Z coordinates and local TPC coordinates for spline calculations, improving both accuracy and maintainability.
4 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for AliceO2Group/AliceO2 focusing on business value and technical achievements. Delivered enhancements to the TPC space charge correction (SC) calibration pipeline by consolidating four commits into a cohesive feature, resulting in more accurate and efficient corrections. The work includes updates to spline handling and interpolation, a new method for merging SC corrections, and a refactor to operate with direct Y/Z coordinates and local TPC coordinates for spline calculations, improving both accuracy and maintainability.
April 2025
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025: Delivered a major enhancement to the TPC space-charge correction workflow in the AliceO2 project by introducing voxel-map based inverse corrections. This refactor of TPCFastSpaceChargeCorrection enables inverse corrections using voxel maps, significantly improving the accuracy of space-charge corrections applied to TPC tracks. The change reduces systematic biases in track reconstruction, enabling more precise physics results and cleaner downstream calibration. The update includes a robust initialization of inverse corrections from the inverse voxel map and a rebase to keep the branch clean. While there were no formally logged major bugs fixed this month, the feature lays a stronger foundation for future bug fixes and calibration improvements.
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025: Delivered a major enhancement to the TPC space-charge correction workflow in the AliceO2 project by introducing voxel-map based inverse corrections. This refactor of TPCFastSpaceChargeCorrection enables inverse corrections using voxel maps, significantly improving the accuracy of space-charge corrections applied to TPC tracks. The change reduces systematic biases in track reconstruction, enabling more precise physics results and cleaner downstream calibration. The update includes a robust initialization of inverse corrections from the inverse voxel map and a rebase to keep the branch clean. While there were no formally logged major bugs fixed this month, the feature lays a stronger foundation for future bug fixes and calibration improvements.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for AliceO2Group/AliceO2. Focused on performance optimization and maintainability improvements in the TPC transformation pipeline. Key accomplishments include delivering the TPC Transformation Performance Optimization by consolidating parameters and methods to reduce the number of transformations, resulting in cleaner code and improved runtime efficiency across the TPC workflow. Commit 45105a91fc28e811998b96ce64a6ebbe581b83f8: 'TPC Splines: minimise the amount of transformations'. No major bugs reported this month. Impact: faster TPC data processing, easier onboarding and future enhancements, and reduced maintenance overhead. Technologies/skills demonstrated: C++ refactoring, performance profiling, parameterization, and clean API design supporting higher data-throughput while maintaining reliability and readability.
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for AliceO2Group/AliceO2. Focused on performance optimization and maintainability improvements in the TPC transformation pipeline. Key accomplishments include delivering the TPC Transformation Performance Optimization by consolidating parameters and methods to reduce the number of transformations, resulting in cleaner code and improved runtime efficiency across the TPC workflow. Commit 45105a91fc28e811998b96ce64a6ebbe581b83f8: 'TPC Splines: minimise the amount of transformations'. No major bugs reported this month. Impact: faster TPC data processing, easier onboarding and future enhancements, and reduced maintenance overhead. Technologies/skills demonstrated: C++ refactoring, performance profiling, parameterization, and clean API design supporting higher data-throughput while maintaining reliability and readability.
February 2025
January 2025
4 Commits
Jan 1, 2025January 2025 monthly summary for AliceO2Group/AliceO2 focused on stabilizing the TPC spatial transformation and spline correction pipeline and clarifying TPC geometry naming. Delivered targeted bug fixes to improve spatial accuracy, traceability, and maintainability; groundwork laid for future feature work in geometry handling.
January 2025
4 Commits
Jan 1, 2025January 2025 monthly summary for AliceO2Group/AliceO2 focused on stabilizing the TPC spatial transformation and spline correction pipeline and clarifying TPC geometry naming. Delivered targeted bug fixes to improve spatial accuracy, traceability, and maintainability; groundwork laid for future feature work in geometry handling.
July 2024
1 Commits
Jul 1, 2024July 2024 performance summary for AliceO2Group/AliceO2. This period prioritized calibration stability and data quality improvements in space-charge corrections within the TPC. The work focused on disabling smoothing in TPC spline calculations and refining bin margin calculations, reducing potential biases and improving reconstruction reliability. No new user-facing features were released this month; the emphasis was on robust fixes that strengthen downstream physics analyses and calibration workflows across the repository.
1 Commits
Jul 1, 2024July 2024 performance summary for AliceO2Group/AliceO2. This period prioritized calibration stability and data quality improvements in space-charge corrections within the TPC. The work focused on disabling smoothing in TPC spline calculations and refining bin margin calculations, reducing potential biases and improving reconstruction reliability. No new user-facing features were released this month; the emphasis was on robust fixes that strengthen downstream physics analyses and calibration workflows across the repository.
July 2024
June 2024
1 Commits • 1 Features
Jun 1, 2024June 2024 — Delivered TPC Calibration Improvement: Enforce Bounds on Space Charge Correction Values in the calibration pipeline for AliceO2. Added configured min/max thresholds to SP correction values with per-TPC-row limits to prevent unphysical calibrations and improve data integrity. Linked commit 2ffa48f319f2f1670ee52bccc6a24968cd3de4f0 ("TPC Splines: add limits for SP correction values per TPC row").
June 2024
1 Commits • 1 Features
Jun 1, 2024June 2024 — Delivered TPC Calibration Improvement: Enforce Bounds on Space Charge Correction Values in the calibration pipeline for AliceO2. Added configured min/max thresholds to SP correction values with per-TPC-row limits to prevent unphysical calibrations and improve data integrity. Linked commit 2ffa48f319f2f1670ee52bccc6a24968cd3de4f0 ("TPC Splines: add limits for SP correction values per TPC row").
April 2024
2 Commits • 1 Features
Apr 1, 20242024-04 Monthly Summary for AliceO2Group/AliceO2 Key outcomes: - Delivered performance and accuracy improvements for TPC data processing by introducing a non-uniform grid for splines aligned with track residual voxels, refining coordinate calculations, and tuning spline parameters. Improved data-handling efficiency and introduced multithreaded processing in reading residual tree data within TPCFastSpaceChargeCorrection. Refactored data structures to support multithreading and ensure correct data access across threads, contributing to faster, more scalable TPC data workflows. Major bugs fixed: - No standalone bugs reported this month; work focused on feature enhancements with robustness improvements through threading and data-structure refactoring, yielding better stability and reliability in high-throughput TPC processing. Overall impact and accomplishments: - Enhanced simulation fidelity and processing throughput for TPC data, enabling more accurate track residual voxel representations and faster data handling on multi-core architectures. This supports larger-scale runs and reduces wall-clock time for analysis pipelines, improving delivery timelines for end users. Technologies/skills demonstrated: - C++ optimization and multithreading, parallel I/O, and data-structure refactoring for thread safety. - TPC spline modeling with non-uniform grids and performance-aware parameter adjustments. - Enhancements to TPCFastSpaceChargeCorrection module for improved data handling and efficiency.
2 Commits • 1 Features
Apr 1, 20242024-04 Monthly Summary for AliceO2Group/AliceO2 Key outcomes: - Delivered performance and accuracy improvements for TPC data processing by introducing a non-uniform grid for splines aligned with track residual voxels, refining coordinate calculations, and tuning spline parameters. Improved data-handling efficiency and introduced multithreaded processing in reading residual tree data within TPCFastSpaceChargeCorrection. Refactored data structures to support multithreading and ensure correct data access across threads, contributing to faster, more scalable TPC data workflows. Major bugs fixed: - No standalone bugs reported this month; work focused on feature enhancements with robustness improvements through threading and data-structure refactoring, yielding better stability and reliability in high-throughput TPC processing. Overall impact and accomplishments: - Enhanced simulation fidelity and processing throughput for TPC data, enabling more accurate track residual voxel representations and faster data handling on multi-core architectures. This supports larger-scale runs and reduces wall-clock time for analysis pipelines, improving delivery timelines for end users. Technologies/skills demonstrated: - C++ optimization and multithreading, parallel I/O, and data-structure refactoring for thread safety. - TPC spline modeling with non-uniform grids and performance-aware parameter adjustments. - Enhancements to TPCFastSpaceChargeCorrection module for improved data handling and efficiency.
April 2024
March 2024
2 Commits • 1 Features
Mar 1, 2024March 2024 monthly summary — AliceO2: Consolidated improvements to TPC track residual handling and transformation accuracy within the TPC Fast Transformation macro and space-charge correction workflow in AliceO2. The work focused on reliable initialization and binning for transformations, improved residual processing, and accurate track-to-bin mapping, enabling robust propagation to TPC row edges. A dedicated performance monitor was added to ensure ongoing efficiency of the residual workflow.
March 2024
2 Commits • 1 Features
Mar 1, 2024March 2024 monthly summary — AliceO2: Consolidated improvements to TPC track residual handling and transformation accuracy within the TPC Fast Transformation macro and space-charge correction workflow in AliceO2. The work focused on reliable initialization and binning for transformations, improved residual processing, and accurate track-to-bin mapping, enabling robust propagation to TPC row edges. A dedicated performance monitor was added to ensure ongoing efficiency of the residual workflow.
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Quality Metrics
Correctness86.2%
Maintainability82.6%
Architecture83.8%
Performance85.0%
AI Usage30.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
Algorithm DevelopmentAlgorithm optimizationC++C++ developmentC++ programmingData AnalysisData analysisData processingData structuresGPU programmingNumerical methodsScientific computingSoftware architecturealgorithm optimizationcalibration
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