There is a performance test plugin with Activemq, that should give you the basic tools to do some performance testing. Have you tried using that one?
Here is the link to the user manual for it: http://activemq.apache.org/activemq-performance-module-users-manual.html
I installed fuse-message-broker-188.8.131.52 as messaging layer. I don't see how I can configure this testtool to test my broker