Performance Evaluation of Computer and Telecommunication Systems

Welcome to this special issue of Simulation: Transactions of the Society for Modeling and Simulation International on ‘Performance Evaluation of Computer and Telecommunication Systems’. The papers included in this special issue are based mainly on selected extended versions of the best papers accepted in the 2007 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2007). We have only accepted six papers in this special issue from many selected extended versions of papers accepted in SPECTS 2007. This means that these accepted papers have undergone a thorough and a critical review process by experts in the field. Tutsch and Lüdtke studied the modeling of chip multiprocessor traffic, which is needed for performance evaluation of such systems. Chip multiprocessor traffic typically consists of a spatial distribution and a multicast distribution. Defining both distributions independently of each other for the model is the simplest way. However, there are sometimes dependencies and some distributions that are not compatible. The authors devised a new algorithm for checking the compatibility of a given stochastic spatial traffic distribution and stochastic multicast traffic distribution. Such a compatibility check avoids incoherent traffic parameters while modeling. The proposed algorithm can be performed before the simulation of the networks-onchip (NoC) in question is started. If the algorithm detects any incompatibility of the traffic distributions, simulation is aborted and the modeler is able to correct the traffic parameters. In addition to the NoC, the algorithm can also be applied to off-chip networks with multicast traffic such as for networks of parallel computer systems. García, García, García and Entrialgo introduced a simulation model to Develop QoS control strategies for appli-