Params: - numThreads : the number of stressor threads that will work on each slave. - perThreadSimulTime : total time (in seconds) of simulation for each stressor thread. - arrivalRate : if the value is greater than 0.0, the "open system" mode is active and the parameter represents the arrival rate (in transactions per second) of a job (a transaction to be executed) to the system; otherwise the "closed system" mode is active: this means that each thread generates and executes a new transaction in an iteration as soon as it has completed the previous iteration. - paymentWeight : percentage of Payment transactions. - orderStatusWeight : percentage of Order Status transactions.