Profiler: Log thread frames

Use this action to log the current frames for each running thread. This helps you discover runaway threads, find out why the executor is overloaded, or track down other threading problems.

This action requires an administrator account.

Using this action from the user interface

If you prefer building automations and scripts visually, Home Assistant walks you through this action step by step. You pick what to target, tweak a few options, and save. No YAML knowledge required.

To log thread frames from an automation or a script:

1. Go to Settings > Automations & scenes.
2. Open an existing automation or script, or select Create automation > Create new automation.
3. If you’re setting up a new automation, add a trigger in the When section. Scripts don’t need a trigger. They run when something else calls them.
4. In the Then do section, select Add action.
5. Search for and select Profiler: Log thread frames.
6. Select Save.

Using this action in YAML

If you work directly in YAML, or you want to know exactly what Home Assistant does under the hood, this section has the technical reference. It lists the field names you use in YAML, their types, and which ones are required.

In YAML, refer to this action as profiler.log_thread_frames. A basic example looks like this:

action: profiler.log_thread_frames

This logs the current frames for each running thread.

This action does not support targets.

Good to know

The frames for each thread are logged, similar to this example:

[homeassistant.components.profiler] Thread [SyncWorker_6]: File "/usr/local/lib/python3.8/threading.py", line 890, in _bootstrap
    self._bootstrap_inner()
  File "/usr/local/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 80, in _worker
    work_item.run()
  File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)

Try it yourself

Ready to test this? Open Developer tools > Actions, search for this action, fill in the fields, and select Perform action. You see what happens on your actual entitiesAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more] without writing a line of YAML.

Still stuck?

The Home Assistant community is quick to help: join Discord for real-time chat, post on the community forum with the action you’re calling and what you expected to happen, or share on our subreddit /r/homeassistant.

Related actions

These actions work well alongside this one:

• Profiler: Log current tasks: Logs all currently running tasks.

• Profiler: Log event loop scheduled: Logs what is scheduled in the event loop.

• Profiler: Dump sockets: Logs all sockets used by Home Assistant.