P403n1x87 / austin

This is the nicest profiler I’ve found for Python. It’s cross-platform, doesn’t need me to change the code that’s being profiled, and its output can be piped directly into flamegraph.pl. I just used it to pinpoint a gross misuse of SQLAlchemy at work that’s run in some code at the end of each day, and now I can go home earlier. -- gthm on lobste.rs

Austin is a Python frame stack sampler for CPython written in pure C. Samples are collected by reading the CPython interpreter virtual memory space in order to retrieve information about the currently running threads along with the stack of the frames that are being executed. Hence, one can use Austin to easily make powerful statistical profilers that have minimal impact on the target application and that don't require any instrumentation.

The simplest way to turn Austin into a full-fledged profiler is to combine it with FlameGraph or Speedscope. However, Austin's simple output format can be piped into any other external or custom tool for further processing. Look, for instance, at the following Python TUI

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