Gradually increasing CPU utilisation

[tj80]

Hi,

 

I have a strange problem with CPU utilisation gradually increasing over a period of many weeks to the point that I need to restart the server.  I'm running 6.1.4 on an old HP Microserver with 4 Dockers running:

- Duck DNS

- HomeAssistant

- TasmoAdmin

- Nginx (doing nothing but hosting a single static HTML page which I just use to store shortcuts to various devices on my internal network)

 

After a clean boot CPU utilisation averages about 7-8% but gradually this ramps up to >80% and I notice my HomeAssistant automations become slower and slower to react - things which normally happen almost instantly take several seconds.  After a reboot CPU drops back down and HomeAssistant performance is back to normal again.  It seems to take about 6 weeks to get to this point, but I can see CPU utilisation gradually increasing all the time.  I rebooted last night and after settling down CPU utilisation was:

 

At 11.30pm last night: System 5.5%, Nice 1.4%, User 1.8%

At 8am this morning: System 5.5%, Nice 1.4%, User 3.6%

 

That may not sound like a lot of increase but this is just over the course of ~8 hours (mostly idle) and happens continuously until the server runs out of puff!

 

How can I see what is causing this and is there a solution?

 

Many thanks,

Tim

[plantsandbinary]

Run 'htop' from the main console and monitor what process is slowly causing more CPU usage.

[tj80]

Thanks!  I'll let the CPU utilisation build up for a while and review.

 

Cheers,
Tim

[tj80]

Resurrecting this topic just to follow up in case it helps anyone in the future.  I tracked down the problem to the built-in MQTT broker used by HomeAssistant.  I disabled this, and instead set up Mosquitto in another Docker container and the ever increasing CPU utilisation has stopped.

 

Hope that helps someone!

Tim