{"categories":[{"label":"Quality Assurance","url":"https://skillfed.io/packages/category/software-development-quality-assurance"},{"label":"Logging","url":"https://skillfed.io/packages/category/system-logging"},{"label":"Bug Tracking","url":"https://skillfed.io/packages/category/software-development-bug-tracking"}],"enrichment":{"capability":"VizTracer traces Python code execution and generates interactive visualizations showing function calls, timing, and execution flow across threads, processes, and async code.","skillfed_tags":["profiling","debugging","performance-analysis"],"use_cases":["Identify performance bottlenecks in CPU-bound Python code by visualizing which functions consume the most time","Debug multi-threaded or async applications by seeing how threads and coroutines interleave and where blocking occurs","Profile PyTorch model training to understand GPU event timing and native call overhead","Trace subprocess and multiprocessing workflows to understand inter-process communication and timing","Generate flamegraphs from trace data to quickly spot hot code paths in large applications"],"what_it_does":"VizTracer is a low-overhead execution tracer that records function entry and exit events, then visualizes them in an interactive timeline UI powered by Perfetto. It works as a command-line tool (no code changes needed for basic tracing) or as an inline context manager for programmatic control. The tracer captures detailed timing information and renders it in a browser-based viewer that supports zooming, filtering, and flamegraph generation.\n\nThe tool is designed to handle concurrent code: it natively supports threading (Python 3.12+ without modification, earlier versions with native threading module), multiprocessing, subprocess, asyncio, and PyTorch profiling. It also supports remote attach to running processes and can log extra information like variable values, function arguments, and exceptions without modifying source code. The fact sheet indicates it is actively maintained, production-stable, and has no known security vulnerabilities.","worth_installing":"Yes. VizTracer is a mature, actively maintained profiler with no security issues, minimal dependencies, and broad platform support. It solves a real problem (understanding code execution flow and performance) with low overhead and a polished UI. The Apache-2.0 license is permissive. Install it if you need to profile or debug Python execution; the command-line interface requires no code changes for initial exploration."},"id":"viztracer","links":{"html":"https://skillfed.io/packages/viztracer","md":"https://skillfed.io/packages/viztracer.md","pypi":"https://pypi.org/project/viztracer/"},"maintenance":{"status":"active"},"meta":{"latest_release":"2025-11-11","license_spdx":"Apache-2.0","license_treatment":"permissive","name":"viztracer","python_support":"supports_current","summary":"A debugging and profiling tool that can trace and visualize python code execution"},"popularity":{"monthly_downloads":1716360,"position":3622,"tier":"top_5000"},"security":{"n_vulnerabilities":0},"version":"1.1.1"}