title: get Mosquitto cpu and memory use
body: <p>I want to get the cpu and memory use of Mosquitto broker while publishing and subscribing to a topic. I execute this linux command: top -p PID, I get 0% for MEM and 0% or 3% for CPU and the most weired think that the process status is S (sleeping) but there is some clients that publish and subscribe to the broker.</p>