Windows native stack profiling

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The document discusses Windows native stack profiling. It describes how stack profiling works by sampling callstacks periodically to analyze CPU usage. It provides details on how to enable and perform stack profiling in Windows using tools like the Windows Performance Recorder and Windows Performance Analyzer. Recent work in 2022 has improved the Windows V8 stack walk functionality to make it work better with tools like Perfetto and improve profiling performance.

Tecnologia

Windows native stack proﬁling
2022 update
José Dapena Paz
BlinkOn 17 lightning talks

Callstack proﬁling
Performance analysis tool: sample periodically the call stacks of all
threads, for a workload.
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Why?
Better understanding of CPU-bound performance problems:
● Provides a break down of the code that is exhausting CPU resources.
● Good for initial analysis for the problem, but also deep dives later.
● It allows to compare different implementations to understand the
improvements or regressions.
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

How does it work?
Compilation stage: add functions information and frame pointers.
Runtime stage:
● JIT compilation generates function information.
● Performance sampler extracts the callstack for all processes and
threads, periodically.
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

System native callstack proﬁling
Callstack proﬁling can beneﬁt from system-wide sampling:
● Include system libraries and dependencies in analysis.
● Integrate with other metrics provided by system.
Many CPU-bound problems are not constrained to a single component.
We may need system-wide data.
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Stack proﬁling in Windows
Recording
Compile with enable_profiling=true.
Run with
chrome --js-flags="--enable-etw-stack-walking
--interpreted-frames-native-stack"
Use Windows Perfomance Recorder or UIForETW, and record a session.
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Stack proﬁling in Windows
Analysis
Analyze it with Windows Performance Analyzer:
● Add paths for PDB symbol ﬁles.
● Use sampled CPU proﬁle mode.
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Windows V8 stack walk
2022 work
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Windows V8 stack walk
2022 work
🎉 It is working again! 🎉
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Windows V8 stack walk
2022 work
● Enabled with --enable-etw-stack-walking, independent
from --interpreted-frames-native-stack.
● Built by default. But no performance penalty when not proﬁling.
● Now it works with Perfetto enabled.
● Proﬁling performance improved.
● Simpliﬁed method names.
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Windows V8 stack walk
2022 work
Contributors: paolosev@microsoft.com jdapena@igalia.com
henrika@chromium.org surshar@microsoft.com
My work has been sponsored by Bloomberg.
Try on V8 10.9.0. Thanks!
Windows native stack proﬁling. 2022 update
José Dapena Paz, Igalia. BlinkOn 17 lightning talks

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The Good, the Bad and the Governed - Why is governance a dirty word? David O'Neill, Chief Operating Officer - APIContext Apidays New York 2024: The API Economy in the AI Era (April 30 & May 1, 2024) ------ Check out our conferences at https://www.apidays.global/ Do you want to sponsor or talk at one of our conferences? https://apidays.typeform.com/to/ILJeAaV8 Learn more on APIscene, the global media made by the community for the community: https://www.apiscene.io Explore the API ecosystem with the API Landscape: https://apilandscape.apiscene.io/

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As privacy and data protection regulations evolve rapidly, organizations operating in multiple jurisdictions face mounting challenges to ensure compliance and safeguard customer data. With state-specific privacy laws coming up in multiple states this year, it is essential to understand what their unique data protection regulations will require clearly. How will data privacy evolve in the US in 2024? How to stay compliant? Our panellists will guide you through the intricacies of these states' specific data privacy laws, clarifying complex legal frameworks and compliance requirements. This webinar will review: - The essential aspects of each state's privacy landscape and the latest updates - Common compliance challenges faced by organizations operating in multiple states and best practices to achieve regulatory adherence - Valuable insights into potential changes to existing regulations and prepare your organization for the evolving landscape

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Windows native stack profiling

1. Windows native stack proﬁling 2022 update José Dapena Paz BlinkOn 17 lightning talks

2. Callstack proﬁling Performance analysis tool: sample periodically the call stacks of all threads, for a workload. Windows native stack proﬁling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

3. Why? Better understanding of CPU-bound performance problems: ● Provides a break down of the code that is exhausting CPU resources. ● Good for initial analysis for the problem, but also deep dives later. ● It allows to compare different implementations to understand the improvements or regressions. Windows native stack proﬁling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

4. How does it work? Compilation stage: add functions information and frame pointers. Runtime stage: ● JIT compilation generates function information. ● Performance sampler extracts the callstack for all processes and threads, periodically. Windows native stack proﬁling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

5. System native callstack profiling Callstack profiling can benefit from system-wide sampling: ● Include system libraries and dependencies in analysis. ● Integrate with other metrics provided by system. Many CPU-bound problems are not constrained to a single component. We may need system-wide data. Windows native stack profiling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

6. Stack proﬁling in Windows Recording Compile with enable_profiling=true. Run with chrome --js-flags="--enable-etw-stack-walking --interpreted-frames-native-stack" Use Windows Perfomance Recorder or UIForETW, and record a session. Windows native stack proﬁling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

7. Stack profiling in Windows Analysis Analyze it with Windows Performance Analyzer: ● Add paths for PDB symbol files. ● Use sampled CPU profile mode. Windows native stack profiling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

8. Windows V8 stack walk 2022 work Windows native stack proﬁling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

9. Windows V8 stack walk 2022 work 🎉 It is working again! 🎉 Windows native stack proﬁling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

10. Windows V8 stack walk 2022 work ● Enabled with --enable-etw-stack-walking, independent from --interpreted-frames-native-stack. ● Built by default. But no performance penalty when not profiling. ● Now it works with Perfetto enabled. ● Profiling performance improved. ● Simplified method names. Windows native stack profiling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

11. Windows V8 stack walk 2022 work Contributors: paolosev@microsoft.com jdapena@igalia.com henrika@chromium.org surshar@microsoft.com My work has been sponsored by Bloomberg. Try on V8 10.9.0. Thanks! Windows native stack proﬁling. 2022 update José Dapena Paz, Igalia. BlinkOn 17 lightning talks

Windows native stack profiling

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