Python Forum

• Detailed description of your problem, including steps to reproduce it
  

This is more informational, than a problem.

I want some way of identifying which of my program's many threads are coming from CPython, and which are coming from C/C++ extension modules.

I can tell my program has a couple dozen threads by looking at it in csysdig on a Linux system.

• What steps have you tried? What was the outcome?
  

I've googled a lot, but I keep getting tutorials about threading, not how to tell Python threads from C/C++ threads.

I've got this question at stackoverflow too: https://stackoverflow.com/questions/5695...he-outside
So far it has no answers.

• Full traceback verbatim or other error you receive
  

The "error" is that the application is much slower than it seems like it should be, even though the CPU load and I/O load on the machine are both low. But this post is mostly about the thread question.

• System info, python version, operating system, etc.
  

Python 2.7.12 (I know; we're working on upgrading to 3.x)
Ubuntu 16.04.6 LTS