Capacity of Opefire 3.9.3

Hello Developers,

I want to know about complete detail about capacity of openfire to handle multiple connection(How many concurrent users can connect with openfire ?).I read many post but in all post people are giving different answers.

Second, how to increase capacity of openfire 3.9.3 to handling multiple connection ?

how to test openfire load testing i read BOSH load testing but i cant understand how to use it .Please give complete guideline to test openfire using BOSH load testing.