Automatic function annotation

Annotating code manually is not always desirable, for example, when you have lots of functions to annotate, or when you want to capture information from third-party libraries.

nvtx can automatically annotate each function call in your program. Note that doing this adds a tiny amount of overhead to each and every function invocation, which can significantly impact the overall runtime (by more than 10x).

This can give you lots of useful information that manual annotation cannot

Command-line interface

You can invoke nvtx as a command-line script, which annotates every function call, with no changes to the source code:

python -m nvtx script.py

The Profile class

You can also use Profile to enable and disable automatic function annotation in different parts of your program:

pr = nvtx.Profile()
pr.enable()  # begin annotating function calls
# -- do something -- #
pr.disable()  # stop annotating function calls