google / perfetto

# Perfetto - System profiling, app tracing and trace analysis
Perfetto is an open-source suite of SDKs, daemons and tools which use
**tracing** to help developers understand the behaviour of complex systems and
root-cause functional and performance issues on client and embedded systems.
It is a production-grade tool that is the default tracing system for the
**Android operating system** and the **Chromium browser**.
## Core Components
Perfetto is not a single tool, but a collection of components that work
together:
- **High-performance tracing daemons:** For capturing tracing information from
 many processes on a single machine into a unified trace file.
- **Low-overhead tracing SDK:** A C++17 library for direct
 userspace-to-userspace tracing of timings and state changes in your
 application.
- **Extensive OS-level probes:** For capturing system-wide context on Android
 and Linux (e.g. scheduling states, CPU frequencies, memory profiling,
 callstack sampling).
- **Browser-based UI:** A powerful, fully local UI for visualizing and exploring
 large, multi-GB traces on a timeline. It works in all major browsers, requires
 no installation, and can open traces from other tools.
- **SQL-based analysis library:** A powerful engine that allows you to
 programmatically query traces using SQL to automate analysis and extract
 custom metrics.
## Why Use Perfetto?
Perfetto was designed to be a versatile and powerful tracing system for a wide
range of use cases.
- **For Android App & Platform Developers:** Debug and root-cause functional and
 performance issues like slow startups, dropped frames (jank), animation
 glitches, low memory kills, and ANRs. Profile both Java/Kotlin and native C++
 memory usage with heap dumps and profiles.
- **For C/C++ Developers (Linux, macOS, Windows):** Use the
 Tracing SDK to instrument your
 application with custom trace points to understand its execution flow, find
 performance bottlenecks, and debug complex behavior. On Linux, you can also
 perform detailed CPU and native heap profiling.
- **For Linux Kernel & System Developers:** Get deep insights into kernel
 behavior. Perfetto acts as an efficient userspace daemon for `ftrace`,
 allowing you to visualize scheduling, syscalls, interrupts, and custom kernel
 tracepoints on a timeline.
- **For Chromium Developers:** Perfetto is the tracing backend for
 `chrome://tracing`. Use it to debug and root-cause issues in the browser, V8,
 and Blink.
- **For Performance Engineers & SREs:** Analyze and visualize a wide range of
 profiling and tracing formats, not just Perfetto's. Use the powerful SQL
 interface to programmatically analyze traces from tools like **Linux perf**,
 **macOS Instruments**, **Chrome JSON traces**, and more.
## Getting Started
We've designed our documentation to guide you to the right information as
quickly as possible, whether you're a newcomer to performance analysis or an
experienced developer.
1. **New to tracing?** If you're unfamiliar with concepts lik