google/perfetto
Oct 2024 – Oct 2025
13 Months active
Languages Used
SQLprotoprotobufpythonsqlTypeScriptC++Python
Technical Skills
MetricsMetrics CollectionPerformance AnalysisSQLTrace Analysisbackend development
Samuel Wu
PROFILE
Samuel Wu
Samuel Wu developed advanced power analysis and energy attribution features for the google/perfetto repository, focusing on the Wattson subsystem. Over 13 months, he engineered robust backend and UI solutions for CPU and GPU power estimation, integrating asynchronous programming, SQL, and TypeScript to improve trace analysis and visualization. His work included refactoring data models, implementing device-specific logic, and ensuring backward compatibility in protobuf schemas. By addressing edge cases in system metrics and optimizing performance for multicore and IRQ-driven workloads, Samuel delivered maintainable, scalable code that enhanced Perfetto’s ability to provide accurate, actionable insights for energy-aware performance engineering.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
76Total
Bugs
14
Commits
76
Features
35
Lines of code
57,830
Activity Months13
Your Network
4376 people
Work History
October 2025
3 Commits • 1 Features
Oct 1, 2025Concise monthly summary for 2025-10 focusing on key features delivered, major bugs fixed, overall impact, and demonstrated technologies/skills for google/perfetto.
3 Commits • 1 Features
Oct 1, 2025Concise monthly summary for 2025-10 focusing on key features delivered, major bugs fixed, overall impact, and demonstrated technologies/skills for google/perfetto.
October 2025
September 2025
3 Commits • 2 Features
Sep 1, 2025September 2025 monthly work summary focusing on Perfetto Wattson power estimation enhancements and precision improvements. Delivered foundational policy dependency framework, extended device support, and precision fixes, delivering business value through more accurate power modeling, greater hardware coverage, and improved reliability in Wattson estimates.
September 2025
3 Commits • 2 Features
Sep 1, 2025September 2025 monthly work summary focusing on Perfetto Wattson power estimation enhancements and precision improvements. Delivered foundational policy dependency framework, extended device support, and precision fixes, delivering business value through more accurate power modeling, greater hardware coverage, and improved reliability in Wattson estimates.
August 2025
6 Commits • 2 Features
Aug 1, 2025Monthly summary for 2025-08 focusing on Perfetto Wattson enhancements, device support, and synchronization improvements. Delivered system-level optimizations for Wattson, added SXR2230P device support, and stabilized data aggregation via asynchronous engine.query().
6 Commits • 2 Features
Aug 1, 2025Monthly summary for 2025-08 focusing on Perfetto Wattson enhancements, device support, and synchronization improvements. Delivered system-level optimizations for Wattson, added SXR2230P device support, and stabilized data aggregation via asynchronous engine.query().
August 2025
July 2025
2 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for google/perfetto. Key deliverables extend Wattson power analysis to IRQ-driven workloads and improved visualization reliability. Implemented IRQ Category for Wattson power attribution and refactored SQL modules to process IRQ data, enabling power measurements during IRQ events including preemptive tasks. Fixed Wattson Marker Slice Display bug to ensure marker visuals only render when a start marker exists and to suppress incomplete slices, preventing misleading visuals. These changes broaden power profiling coverage, improve measurement accuracy, and reduce visualization noise, delivering more actionable diagnostics for performance engineers.
July 2025
2 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for google/perfetto. Key deliverables extend Wattson power analysis to IRQ-driven workloads and improved visualization reliability. Implemented IRQ Category for Wattson power attribution and refactored SQL modules to process IRQ data, enabling power measurements during IRQ events including preemptive tasks. Fixed Wattson Marker Slice Display bug to ensure marker visuals only render when a start marker exists and to suppress incomplete slices, preventing misleading visuals. These changes broaden power profiling coverage, improve measurement accuracy, and reduce visualization noise, delivering more actionable diagnostics for performance engineers.
June 2025
6 Commits • 4 Features
Jun 1, 2025June 2025: Delivered major Wattson enhancements and IRQ trace view improvements for google/perfetto. Implemented GPU energy estimation into Wattson rail metrics, UI performance and attribution enhancements with continuous estimates, internal Wattson refactor/cleanup for maintainability, and extended trace processing with IRQ view capabilities. These changes strengthen energy-aware performance modeling, data attribution, UI responsiveness, and trace analysis.
6 Commits • 4 Features
Jun 1, 2025June 2025: Delivered major Wattson enhancements and IRQ trace view improvements for google/perfetto. Implemented GPU energy estimation into Wattson rail metrics, UI performance and attribution enhancements with continuous estimates, internal Wattson refactor/cleanup for maintainability, and extended trace processing with IRQ view capabilities. These changes strengthen energy-aware performance modeling, data attribution, UI responsiveness, and trace analysis.
June 2025
May 2025
6 Commits • 2 Features
May 1, 2025Monthly summary for 2025-05 focusing on Wattson CPU analysis improvements and GPU integration readiness. In May, we reorganized Wattson CPU files to align with a new subdirectory structure to support upcoming GPU hardware IP integration, and delivered GPU power estimation capabilities and UI visualization, consolidating CPU and GPU estimates and enabling UI markers. These changes establish a solid foundation for GPU-aware performance analysis and pave the way for more accurate power budgeting across CPU+GPU workloads. While the month centered on feature development and refactoring rather than customer-facing fixes, the work reduces future integration risk and improves maintainability and observability of Wattson subsystems.
May 2025
6 Commits • 2 Features
May 1, 2025Monthly summary for 2025-05 focusing on Wattson CPU analysis improvements and GPU integration readiness. In May, we reorganized Wattson CPU files to align with a new subdirectory structure to support upcoming GPU hardware IP integration, and delivered GPU power estimation capabilities and UI visualization, consolidating CPU and GPU estimates and enabling UI markers. These changes establish a solid foundation for GPU-aware performance analysis and pave the way for more accurate power budgeting across CPU+GPU workloads. While the month centered on feature development and refactoring rather than customer-facing fixes, the work reduces future integration risk and improves maintainability and observability of Wattson subsystems.
April 2025
3 Commits • 1 Features
Apr 1, 2025Concise month-end summary for 2025-04: Implemented a Wattson calculation accuracy fix for zero-duration slices and delivered Wattson UI enhancements, including unit toggle and marker visualization. These changes improve reliability of performance measurements and readability of Wattson data for analysis and decision-making.
3 Commits • 1 Features
Apr 1, 2025Concise month-end summary for 2025-04: Implemented a Wattson calculation accuracy fix for zero-duration slices and delivered Wattson UI enhancements, including unit toggle and marker visualization. These changes improve reliability of performance measurements and readability of Wattson data for analysis and decision-making.
April 2025
March 2025
10 Commits • 3 Features
Mar 1, 2025March 2025 performance summary for google/perfetto: Delivered enhancements to Wattson power attribution, added metadata improvements, corrected idle cost attribution, and optimized Wattson UI performance and isolation. The work spans backend metric generation, attribution logic, and frontend presentation, delivering more accurate energy accounting, clearer data identifiers, and a faster, collision-free UI experience. This month emphasized business value through precise energy attribution for per-thread workloads, robust defaults for idle costs, and UI-level performance improvements that reduce user wait times and maintenance overhead.
March 2025
10 Commits • 3 Features
Mar 1, 2025March 2025 performance summary for google/perfetto: Delivered enhancements to Wattson power attribution, added metadata improvements, corrected idle cost attribution, and optimized Wattson UI performance and isolation. The work spans backend metric generation, attribution logic, and frontend presentation, delivering more accurate energy accounting, clearer data identifiers, and a faster, collision-free UI experience. This month emphasized business value through precise energy attribution for per-thread workloads, robust defaults for idle costs, and UI-level performance improvements that reduce user wait times and maintenance overhead.
February 2025
1 Commits • 1 Features
Feb 1, 2025Concise monthly summary for 2025-02 focusing on key accomplishments in the google/perfetto repository. Delivered Mali GPU power state tracing support, expanding performance analysis capabilities and laying groundwork for GPU power management insights. The work improves observability, debugging, and optimization opportunities for Mali GPU power usage within performance traces.
1 Commits • 1 Features
Feb 1, 2025Concise monthly summary for 2025-02 focusing on key accomplishments in the google/perfetto repository. Delivered Mali GPU power state tracing support, expanding performance analysis capabilities and laying groundwork for GPU power management insights. The work improves observability, debugging, and optimization opportunities for Mali GPU power usage within performance traces.
February 2025
January 2025
9 Commits • 3 Features
Jan 1, 2025Month: 2025-01 — Performance-focused month for google/perfetto with Wattson metrics. Stabilized data paths, improved UI clarity, and enabled finer performance attribution. Delivered fixes, data-model changes, and UI/energy accounting refinements to reduce crashes, enhance measurement accuracy, and support future cleanup and scalability.
January 2025
9 Commits • 3 Features
Jan 1, 2025Month: 2025-01 — Performance-focused month for google/perfetto with Wattson metrics. Stabilized data paths, improved UI clarity, and enabled finer performance attribution. Delivered fixes, data-model changes, and UI/energy accounting refinements to reduce crashes, enhance measurement accuracy, and support future cleanup and scalability.
December 2024
9 Commits • 4 Features
Dec 1, 2024Month: 2024-12 — The team delivered substantial Wattson-related enhancements, focusing on energy attribution accuracy, reporting clarity, and maintainability. Deliverables span UI improvements, CPU hotplug analysis for sleep-state power estimation, and targeted SQL/stdlib refinements, underpinned by expanded tests. The work was implemented across multiple commits in UI, parsing, power modeling, and SQL layers, driving more reliable energy insights for hardware and software optimization.
9 Commits • 4 Features
Dec 1, 2024Month: 2024-12 — The team delivered substantial Wattson-related enhancements, focusing on energy attribution accuracy, reporting clarity, and maintainability. Deliverables span UI improvements, CPU hotplug analysis for sleep-state power estimation, and targeted SQL/stdlib refinements, underpinned by expanded tests. The work was implemented across multiple commits in UI, parsing, power modeling, and SQL layers, driving more reliable energy insights for hardware and software optimization.
December 2024
November 2024
12 Commits • 9 Features
Nov 1, 2024November 2024 highlights: Delivered granular Wattson per-thread power analytics with multi-period support (period_id) and updated proto/SQL; added DSU frequency support for VM traces; standardized Wattson power estimates retrieval; improved UI performance via lazy-loading, reordering data from granular to broad, and default activation of the Wattson plugin; expanded idle attribution and device idle state mappings; added Neo device support. Fixed critical issues including removal of duplicate Wattson attribution SQL view and correct estimates when entire CPU tracks are missing. These changes deliver more accurate, scalable power analysis, faster user experience, and broader device coverage, reinforcing Perfetto’s value for performance-aware engineering.
November 2024
12 Commits • 9 Features
Nov 1, 2024November 2024 highlights: Delivered granular Wattson per-thread power analytics with multi-period support (period_id) and updated proto/SQL; added DSU frequency support for VM traces; standardized Wattson power estimates retrieval; improved UI performance via lazy-loading, reordering data from granular to broad, and default activation of the Wattson plugin; expanded idle attribution and device idle state mappings; added Neo device support. Fixed critical issues including removal of duplicate Wattson attribution SQL view and correct estimates when entire CPU tracks are missing. These changes deliver more accurate, scalable power analysis, faster user experience, and broader device coverage, reinforcing Perfetto’s value for performance-aware engineering.
October 2024
6 Commits • 2 Features
Oct 1, 20242024-10 Monthly summary for google/perfetto: Delivered Wattson power/trace metrics improvements focused on reliability, accuracy, and deeper energy insights. Key changes include end-of-slice energy accounting to fix energy Metrics, interval-based handling for per-thread and per-rail metrics, and expanded metric depth with versioning and energy reporting. These improvements enable more accurate power budgets and energy-aware performance profiling across threaded and multicore workloads. The work strengthens Perfetto's power instrumentation and provides richer telemetry for optimization, while maintaining compatibility with existing dashboards and tooling.
6 Commits • 2 Features
Oct 1, 20242024-10 Monthly summary for google/perfetto: Delivered Wattson power/trace metrics improvements focused on reliability, accuracy, and deeper energy insights. Key changes include end-of-slice energy accounting to fix energy Metrics, interval-based handling for per-thread and per-rail metrics, and expanded metric depth with versioning and energy reporting. These improvements enable more accurate power budgets and energy-aware performance profiling across threaded and multicore workloads. The work strengthens Perfetto's power instrumentation and provides richer telemetry for optimization, while maintaining compatibility with existing dashboards and tooling.
October 2024
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Quality Metrics
Correctness94.2%
Maintainability92.4%
Architecture91.4%
Performance88.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
BPC++GNGN BuildJavaScriptProtoPythonSQLShellTypeScript
Technical Skills
Android DevelopmentAndroid System InternalsAsynchronous ProgrammingBug FixingBuild System ConfigurationBuild SystemsC++ DevelopmentCode CleanupCode FormattingCode OrganizationCode RefactoringData AggregationData ConsistencyData MetricsData Modeling
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