CPU usage qtp threads

Following on from the command in this thread to monitor for high CPU usage High CPU Usage since upgrade to 5.0.1

Can anyone point me towards the docs, or let me know what “qtp” tasks are, and how to identify what they correspond to in OH?

I get the occasional seize up of my server when OH5.0.1 (Linux-x64, dual core, plenty of memory) from the OH process maxing out. In order I’m finding the main consumers of CPU are: OH-RR4J-1, OH-OSCiEventManager, OH-eventexecutor-13-1, and then the numbers drop off a lot. What I am seeing though is a bunch of qtpNNNNNNNN-NNNNN tasks spiking all over the shop, which I feel warrants further scrutiny.

Still something I’m regularly suffering from, does anybody know how I can diagnose this further?