Hybrid solution of layered qeueing networks

The layered queueing network model has been very useful for solving performance models of distributed systems with client-server interactions. Fast analytic solutions exist for a broad range of models. However, models which contain elements which cannot be solved using approximate mean value analysis (MVA) must instead be solved using simulation. In this work, a hybrid solution strategy is used where MVA is used for part of the solution, and another solver, in this case simulation, is used for the remainder. This differs from other work where the analytic LQN solver was used as part of a solution because these other approaches have always solved a complete layered model as part of the o