[Twisted-Python] threads monitoring

Hello, How can I monitor the number of created threads when I use just function deferToThreds in my code?

Could you give me an example, please?

If I do following: ThreadPool.dumpStats()

I get

TypeError: unbound method dumpStats() must be called with ThreadPool instance as first argument (got nothing instead)

Here I understand I have to make an instance of ThreadPool, but if I just use deferToThreads from threads module I'm not sure how to accomplish it.

Thanks, Ladislav