py-spy
Profile running Python programs with extremely low overhead. Visualize time spent without restarting or modifying code. Safe for production environments.
py-spy is a sampling profiler for Python programs that lets you visualize what your code is spending time on without restarting the program or modifying the code. It's written in Rust for speed and runs in a separate process, resulting in extremely low overhead. This makes it safe to use against production Python code.
Key features include:
- Works on Linux, macOS, Windows, and FreeBSD.
- Supports CPython versions 2.3-2.7 and 3.3-3.13.
- No code modification or program restarts required.
- Three operating modes:
record: Saves profiling data to a file (e.g., interactive SVG flame graphs).top: Displays a live, updating view similar to thetopcommand.dump: Shows the current call stack for each thread, useful for debugging hangs.
- Optional profiling of native C/C++/Cython extensions.
- Ability to profile subprocesses (e.g., multiprocessing or gunicorn workers).
- GIL usage reporting and filtering.
Tags:
Starlight
pdoc
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