The PeerAttributesHandler class uses a thread pool to handle JMX notficiations from peer drivers when they update their number of nodes and total number of node threads. It uses Runtime.getRuntime().availableProcessors() which seems wasteful since the tasks performed by the threds are very short-lived.

We should use a configuration property "jppf.peer.handler.threads" which defaults to 1 to configure this number of threads instead.