The-OpenROAD-Project/OpenROAD
Jan 2025 – Feb 2026
13 Months active
Languages Used
C++DEFDefUnknownBUILDTclPythonJSON
Technical Skills
Code RefactoringDocumentationC++C++ DevelopmentCMakeCode Readability
João Mai
PROFILE
João Mai
Jian Mai contributed to The-OpenROAD-Project/OpenROAD by engineering robust macro placement, clustering, and tiling features for large-scale VLSI design flows. Over 13 months, Jian refactored and optimized C++ code to improve placement accuracy, maintainability, and test coverage, introducing macro-aware clustering engines, enhanced snapping logic, and database unit consistency. He modernized APIs, expanded test automation with Python and Tcl scripting, and integrated performance metrics for better observability. His disciplined approach included code cleanup, static analysis, and documentation, reducing defect risk and accelerating onboarding. Jian’s work delivered scalable, reliable layout algorithms and maintainable infrastructure, supporting faster iteration and higher-quality physical design outcomes.
Overall Statistics
Feature vs Bugs
75%Features
Repository Contributions
194Total
Bugs
18
Commits
194
Features
55
Lines of code
40,896
Activity Months13
Your Network
101 peopleSame Organization
@precisioninno.com14
Shared Repositories
87
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Work History
February 2026
3 Commits • 2 Features
Feb 1, 2026February 2026 monthly summary for The-OpenROAD-Project/OpenROAD focusing on business value, technical achievements, and overall impact. Key work this month centered on stability fixes, accuracy improvements in macro placement, and enhanced performance metrics for TinyRocket. These efforts contributed to more reliable layouts, better design-space exploration confidence, and clearer performance signals for stakeholders.
3 Commits • 2 Features
Feb 1, 2026February 2026 monthly summary for The-OpenROAD-Project/OpenROAD focusing on business value, technical achievements, and overall impact. Key work this month centered on stability fixes, accuracy improvements in macro placement, and enhanced performance metrics for TinyRocket. These efforts contributed to more reliable layouts, better design-space exploration confidence, and clearer performance signals for stakeholders.
February 2026
January 2026
34 Commits • 13 Features
Jan 1, 2026January 2026 highlights: Macro clustering improvements, halo tooling enhancements, and disciplined MPL maintenance that collectively boost design reliability and developer productivity. Key features delivered include macro cluster coarse shaping improvements (tuning and removal of annealing) and enhanced halo visualization and macro control via updated graphics and TCL commands. The work also advanced code quality and maintainability through extensive MPL cleanup/refactoring, with refinements to naming, empty() usage, and notching/segment penalty logic. In addition, floorplan-awareness and data-model upgrades were implemented (creating macros after floorplan initialization and adopting HardMacro::Halo for halo data), backed by updated tests and documentation. Overall, the month delivered a more robust macro workflow, clearer data models, and stronger test coverage, enabling faster iteration and more reliable chip design flows.
January 2026
34 Commits • 13 Features
Jan 1, 2026January 2026 highlights: Macro clustering improvements, halo tooling enhancements, and disciplined MPL maintenance that collectively boost design reliability and developer productivity. Key features delivered include macro cluster coarse shaping improvements (tuning and removal of annealing) and enhanced halo visualization and macro control via updated graphics and TCL commands. The work also advanced code quality and maintainability through extensive MPL cleanup/refactoring, with refinements to naming, empty() usage, and notching/segment penalty logic. In addition, floorplan-awareness and data-model upgrades were implemented (creating macros after floorplan initialization and adopting HardMacro::Halo for halo data), backed by updated tests and documentation. Overall, the month delivered a more robust macro workflow, clearer data models, and stronger test coverage, enabling faster iteration and more reliable chip design flows.
December 2025
34 Commits • 10 Features
Dec 1, 2025December 2025 monthly summary for The-OpenROAD-Project/OpenROAD. Focused on delivering code quality improvements, API modernization in MPL, test infrastructure enhancements, and telemetry improvements with clear business value. Key features delivered and architectural changes: - Code quality cleanups: extensive clang-tidy fixes and formatting across core OpenROAD and MPL codebases, improving maintainability and reducing CI risk. - MPL API refactors and improvements: rename of Point type to odb::Point, removal of leftover floats, and API usage updates (boundary/overlap semantics and micon-to-dbu conversions); API updates accompanied by test adjustments. - MPL test and TCL test updates: refreshed MPL tests and OR TCL tests to align with API changes and improve test reliability. - Performance/metrics telemetry: TinyRocket metrics update to improve observability and runtime insights. - MPL core improvements: relocate guides/fences only when valid; remove conversion to microns in WL calculations; updated tests accordingly. - Packaging and tilings: MPL: Tight packing tilings across all macro clusters; removal of duplicates in macro-cluster tilings; validation of cluster sizes before merging; additional code formatting cleanup for MPL tiling module. - Notch penalty and display enhancements: improved notch penalty computation, display, and related graphics for MPL. Major bugs fixed: - MPL Typo fix to eliminate a known source of confusion and minor functional drift. - GPL: removed parallelization in updateDBGcells() to fix potential race conditions. - Notable test/coverage issues fixed as part of MPL test updates and formatting cleanup. Overall impact and accomplishments: - Strengthened code quality, API stability, and test reliability, enabling faster onboarding and safer feature delivery. - Improved maintainability and readability across MPL and core OpenROAD, lowering risk of regressions in future releases. - Enhanced observability and debugging capabilities through updated metrics and tests. Technologies/skills demonstrated: - C++ refactoring and modern C++ API design (MPL changes, Point type migration). - Static analysis and code quality tooling (clang-tidy, clang-format). - Test infrastructure modernization (MPL and TCL tests). - Telemetry and metrics integration (TinyRocket metrics). - Code review discipline and signed-off contributions.
34 Commits • 10 Features
Dec 1, 2025December 2025 monthly summary for The-OpenROAD-Project/OpenROAD. Focused on delivering code quality improvements, API modernization in MPL, test infrastructure enhancements, and telemetry improvements with clear business value. Key features delivered and architectural changes: - Code quality cleanups: extensive clang-tidy fixes and formatting across core OpenROAD and MPL codebases, improving maintainability and reducing CI risk. - MPL API refactors and improvements: rename of Point type to odb::Point, removal of leftover floats, and API usage updates (boundary/overlap semantics and micon-to-dbu conversions); API updates accompanied by test adjustments. - MPL test and TCL test updates: refreshed MPL tests and OR TCL tests to align with API changes and improve test reliability. - Performance/metrics telemetry: TinyRocket metrics update to improve observability and runtime insights. - MPL core improvements: relocate guides/fences only when valid; remove conversion to microns in WL calculations; updated tests accordingly. - Packaging and tilings: MPL: Tight packing tilings across all macro clusters; removal of duplicates in macro-cluster tilings; validation of cluster sizes before merging; additional code formatting cleanup for MPL tiling module. - Notch penalty and display enhancements: improved notch penalty computation, display, and related graphics for MPL. Major bugs fixed: - MPL Typo fix to eliminate a known source of confusion and minor functional drift. - GPL: removed parallelization in updateDBGcells() to fix potential race conditions. - Notable test/coverage issues fixed as part of MPL test updates and formatting cleanup. Overall impact and accomplishments: - Strengthened code quality, API stability, and test reliability, enabling faster onboarding and safer feature delivery. - Improved maintainability and readability across MPL and core OpenROAD, lowering risk of regressions in future releases. - Enhanced observability and debugging capabilities through updated metrics and tests. Technologies/skills demonstrated: - C++ refactoring and modern C++ API design (MPL changes, Point type migration). - Static analysis and code quality tooling (clang-tidy, clang-format). - Test infrastructure modernization (MPL and TCL tests). - Telemetry and metrics integration (TinyRocket metrics). - Code review discipline and signed-off contributions.
December 2025
November 2025
10 Commits • 2 Features
Nov 1, 2025November 2025 OpenROAD monthly summary: Delivered key improvements to layout fidelity and macro placement accuracy. Implemented database unit consistency by migrating sizing, fences, and rectangles from microns to dbu, reducing conversion errors and improving sizing accuracy. Enhanced MacroPlacer accuracy and area calculation with guidance region handling, blockages, overlap prevention, and area APIs; completed dbu cleanup and cluster sizing refinements. Fixed placement-related issues (blockages and macro overlap) and updated tests to reflect API changes. Result: more reliable, reproducible physical layouts; reduced rework risk, better fabrication predictability, and improved APIs enabling further optimization. Demonstrated expertise in C++ code changes, API design, and test automation.
November 2025
10 Commits • 2 Features
Nov 1, 2025November 2025 OpenROAD monthly summary: Delivered key improvements to layout fidelity and macro placement accuracy. Implemented database unit consistency by migrating sizing, fences, and rectangles from microns to dbu, reducing conversion errors and improving sizing accuracy. Enhanced MacroPlacer accuracy and area calculation with guidance region handling, blockages, overlap prevention, and area APIs; completed dbu cleanup and cluster sizing refinements. Fixed placement-related issues (blockages and macro overlap) and updated tests to reflect API changes. Result: more reliable, reproducible physical layouts; reduced rework risk, better fabrication predictability, and improved APIs enabling further optimization. Demonstrated expertise in C++ code changes, API design, and test automation.
October 2025
6 Commits • 3 Features
Oct 1, 2025Month: 2025-10 — The OpenROAD MPL work focused on enabling new capabilities, improving design correctness for tight designs, and enhancing code hygiene to support faster iteration and robust builds in The-OpenROAD-Project/OpenROAD.
6 Commits • 3 Features
Oct 1, 2025Month: 2025-10 — The OpenROAD MPL work focused on enabling new capabilities, improving design correctness for tight designs, and enhancing code hygiene to support faster iteration and robust builds in The-OpenROAD-Project/OpenROAD.
October 2025
September 2025
35 Commits • 13 Features
Sep 1, 20252025-09 Monthly Summary for The-OpenROAD-Project/OpenROAD. Focused on delivering robust MPL improvements, API stability, and code quality enhancements to enable more scalable floorplanning, reduce risk, and accelerate development cycles.
September 2025
35 Commits • 13 Features
Sep 1, 20252025-09 Monthly Summary for The-OpenROAD-Project/OpenROAD. Focused on delivering robust MPL improvements, API stability, and code quality enhancements to enable more scalable floorplanning, reduce risk, and accelerate development cycles.
August 2025
18 Commits • 3 Features
Aug 1, 2025August 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on macro placement enhancements, SA-based convergence improvements, and codebase hygiene. Deliverables emphasize business value through improved placement quality, faster convergence for large macro arrays, and maintainable code with regression coverage.
18 Commits • 3 Features
Aug 1, 2025August 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on macro placement enhancements, SA-based convergence improvements, and codebase hygiene. Deliverables emphasize business value through improved placement quality, faster convergence for large macro arrays, and maintainable code with regression coverage.
August 2025
July 2025
11 Commits • 4 Features
Jul 1, 2025July 2025 - The-OpenROAD-Project/OpenROAD: Delivered key features and reliability improvements to placement and macro handling. Implemented improved cluster detection for large flat clusters via the isLargeFlatCluster helper, and stabilized macro perturbation state management in the SA core and SACore to prevent state inconsistencies. Refined notch penalty calculation in SACoreSoftMacro to better optimize macro placement. Built a foundation for maintainability with code quality improvements including formatting, test updates, and build/test parameter tweaks. Fixed a critical bug: inconsistent restore during macro perturbations, reducing risk of erroneous simulations and improving robustness. These changes deliver more accurate, reliable placements, faster iteration, and stronger code quality, translating to tangible business value.
July 2025
11 Commits • 4 Features
Jul 1, 2025July 2025 - The-OpenROAD-Project/OpenROAD: Delivered key features and reliability improvements to placement and macro handling. Implemented improved cluster detection for large flat clusters via the isLargeFlatCluster helper, and stabilized macro perturbation state management in the SA core and SACore to prevent state inconsistencies. Refined notch penalty calculation in SACoreSoftMacro to better optimize macro placement. Built a foundation for maintainability with code quality improvements including formatting, test updates, and build/test parameter tweaks. Fixed a critical bug: inconsistent restore during macro perturbations, reducing risk of erroneous simulations and improving robustness. These changes deliver more accurate, reliable placements, faster iteration, and stronger code quality, translating to tangible business value.
June 2025
5 Commits
Jun 1, 2025June 2025: Focused stability and correctness improvements in MPL cluster handling and tiling workflows for The OpenROAD project. Delivered targeted bug fixes that improve correctness (ClusterEngine) and visibility (tiling error reporting), resulting in more reliable layout processing, earlier failure detection, and easier debugging. Demonstrated proficiency in C++ refactoring, logging, and test maintenance, with measurable business value through reduced production risk and clearer, maintainable code paths.
5 Commits
Jun 1, 2025June 2025: Focused stability and correctness improvements in MPL cluster handling and tiling workflows for The OpenROAD project. Delivered targeted bug fixes that improve correctness (ClusterEngine) and visibility (tiling error reporting), resulting in more reliable layout processing, earlier failure detection, and easier debugging. Demonstrated proficiency in C++ refactoring, logging, and test maintenance, with measurable business value through reduced production risk and clearer, maintainable code paths.
June 2025
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 focused on enhancing clustering with macro-awareness to improve stability, quality of clustering decisions, and observability in large designs within The OpenROAD project. The core work delivered the Advanced Clustering Engine improvements to factor macro thresholds into clustering decisions, updates to the clustering pipeline (multilevelAutocluster and updateSubTree) with max_macro checks, and refined BreakLargeFlatCluster logic for stability and correctness. Improved logging/diagnostics supports faster debugging and performance tuning across large-scale designs.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 focused on enhancing clustering with macro-awareness to improve stability, quality of clustering decisions, and observability in large designs within The OpenROAD project. The core work delivered the Advanced Clustering Engine improvements to factor macro thresholds into clustering decisions, updates to the clustering pipeline (multilevelAutocluster and updateSubTree) with max_macro checks, and refined BreakLargeFlatCluster logic for stability and correctness. Improved logging/diagnostics supports faster debugging and performance tuning across large-scale designs.
April 2025
20 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for The-OpenROAD-Project/OpenROAD. Delivered Snapper placement improvements with a focus on accuracy, robustness, and workflow stability for complex macro-based designs. Strengthened code quality and test coverage to ensure long-term reliability and maintainability.
20 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for The-OpenROAD-Project/OpenROAD. Delivered Snapper placement improvements with a focus on accuracy, robustness, and workflow stability for complex macro-based designs. Strengthened code quality and test coverage to ensure long-term reliability and maintainability.
April 2025
February 2025
15 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for The-OpenROAD-Project/OpenROAD focused on delivering a robust macro snapping capability, stabilizing snapping behavior, and expanding test coverage. The work positions the project for more reliable macro placement and faster iteration in layout flows.
February 2025
15 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for The-OpenROAD-Project/OpenROAD focused on delivering a robust macro snapping capability, stabilizing snapping behavior, and expanding test coverage. The work positions the project for more reliable macro placement and faster iteration in layout flows.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 performance summary: Focused on improving code clarity and maintainability in a critical snapping path of the OpenROAD repository, setting the stage for safer future enhancements and faster onboarding.
1 Commits • 1 Features
Jan 1, 2025January 2025 performance summary: Focused on improving code clarity and maintainability in a critical snapping path of the OpenROAD repository, setting the stage for safer future enhancements and faster onboarding.
January 2025
Activity
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Quality Metrics
Correctness89.4%
Maintainability89.2%
Architecture85.6%
Performance84.0%
AI Usage22.2%
Skills & Technologies
Programming Languages
BUILDC++DEFDefJSONMarkdownPythonTclUnknowndefok
Technical Skills
API DevelopmentAPI designAlgorithm DesignAlgorithm ImplementationAlgorithm OptimizationBazelBug FixingBuild System ConfigurationBuild SystemsC++C++ DevelopmentC++ developmentC++ programmingCMakeChip Design
Repositories Contributed To
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