gaogaotiantian/viztracer

Health v2 · maintenance only

Adoption not part of the score

7725 stars · 473 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

VizTracer is a low-overhead debugging and profiling tool that traces and visualizes Python code execution on an interactive timeline. It requires no source code changes, supports threading, multiprocessing, async, and PyTorch, and renders traces in a Perfetto-powered viewer.

Use cases

• profile python script execution
• visualize function call timeline
• find performance bottlenecks in python code
• debug async and multithreaded python programs
• generate flamegraphs for python
• trace multiprocessing and subprocess calls
• inspect function entry and exit with source code

When to choose

• you need low-overhead Python tracing without changing source code
• you want timeline visualization of function calls including async and multiprocessing
• you need to render very large trace files smoothly

When to avoid

• you need production continuous profiling rather than on-demand tracing
• you profile non-Python code
• you need memory profiling specifically

Facets

cli-tool · maturity active

tracing monitoring benchmarking developer-tools cli data-visualization developer-tools performance python windows cli profiler flamegraph trace-visualization perfetto async-debugging debugging linux macos

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