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Python Line-by-Line Profiling of a Program's Speed
How to profile your Python program line-by-line in 0 lines of code, 2 lines of shell commands
How long does each line in your Python program take to run?
Here are two super quick, user-friendly options (no code refactoring required + out-of-the-box pretty visualizations):
- cProfile + SnakeViz
- VizTracer (use this for multiprocessing)
cProfile + SnakeViz
pip install snakeviz
How to Use
python3 -m cProfile -o out.prof YOUR_PYTHON_PROGRAM.py snakeviz out.prof
You can now visit localhost:8080 in your browser to view the line-by-line heatmap for your program:
Note: This is better for programs with multiprocessing.
pip install viztracer
How to Use
It will then print out the command that you need to run to view your program’s output.
It will look something like this:
Use the following command to open the report: vizviewer PATH_TO_YOUR_PYTHON_PROGRAM/result.json
Run that command, then visit localhost:9001 in your browser to view the line-by-line heatmap for your program: