google/perfetto
Jan 2025 – Mar 2025
3 Months active
Languages Used
C++GNPythonSQLTypeScriptprotobuf
Technical Skills
Build System ConfigurationC++Data AggregationData VisualizationDatabase InternalsDebugging
Leszek Swirski
PROFILE
Leszek Swirski
Worked on the google/perfetto repository over three months, delivering cross-platform profiling enhancements and improving performance analysis workflows. Developed features such as Apple Instruments profiling support and enriched JavaScript trace data, using C++ and SQL to integrate JIT symbolization and detailed flamegraph annotations. Enhanced cross-language observability by aligning JavaScript pprof frame formatting with native flamegraphs, refactoring code for consistency and future extensibility. Addressed robustness in large-scale data ingestion by stabilizing XML parsing through chunked processing and allocation retry logic. Focused on system integration, performance profiling, and error handling, contributing to more reliable and flexible profiling tools for diverse production environments.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
8Total
Bugs
1
Commits
8
Features
4
Lines of code
1,137
Activity Months3
Your Network
5258 peopleSame Organization
@google.com4997
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Shared Repositories
261
Work History
March 2025
1 Commits
Mar 1, 2025Concise monthly summary for 2025-03 focusing on the google/perfetto repository. Delivered stability improvements for the XML parser when processing very large XML inputs by implementing chunked parsing and allocation retry logic to prevent crashes and errors in high-volume ingestion scenarios.
1 Commits
Mar 1, 2025Concise monthly summary for 2025-03 focusing on the google/perfetto repository. Delivered stability improvements for the XML parser when processing very large XML inputs by implementing chunked parsing and allocation retry logic to prevent crashes and errors in high-volume ingestion scenarios.
March 2025
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 performance month for google/perfetto focused on improving cross-language flamegraph consistency by aligning JavaScript pprof frame formatting with native flamegraphs. Implemented port of the frame naming logic from native flamegraph queries to the pprof exporter (currently via manual table lookups) and documented a TODO to unify with the SQL-based implementation. This work enhances observability and reduces context switching when analyzing performance across JS and native code.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 performance month for google/perfetto focused on improving cross-language flamegraph consistency by aligning JavaScript pprof frame formatting with native flamegraphs. Implemented port of the frame naming logic from native flamegraph queries to the pprof exporter (currently via manual table lookups) and documented a TODO to unify with the SQL-based implementation. This work enhances observability and reduces context switching when analyzing performance across JS and native code.
January 2025
6 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for Perfetto focused on delivering cross-platform profiling enhancements, richer JavaScript trace data, and data-flexible processing to drive faster performance analysis and better decision-making.
6 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for Perfetto focused on delivering cross-platform profiling enhancements, richer JavaScript trace data, and data-flexible processing to drive faster performance analysis and better decision-making.
January 2025
Activity
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Quality Metrics
Correctness91.4%
Maintainability85.0%
Architecture86.2%
Performance78.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++GNPythonSQLTypeScriptprotobuf
Technical Skills
Build System ConfigurationC++Code RefactoringData AggregationData ExportData VisualizationDatabase InternalsDebuggingError HandlingJIT SymbolizationPerformance AnalysisPerformance OptimizationPerformance ProfilingProtocol BuffersSQL
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline