What is a Worker Process?

[miguel_balsa]

I'm more or less familiar with workers in IIS, but I've found that the metric "Worker Process" is available in every technology, under each process:

Can I get a general explanation of what is this metric talking about exactly?

Thanks!

[michael_kopp · Accepted solution]

Node.js like Apache does not due multi threading but multi processing. Nothing really distinguishes these processes they all act like "threads". Dynatrace detects this properly. A single Process Group Instance is detected for these Node.js processes. The Worker processes tell you how many node.js processes run just now in that particular Process Group Instance