PERFORMANCE EVALUATION OF COMMUNICATION GRIDS WITH CUT-THROUGH SWITCHING NODES

Abstract

For the performance evaluation of communication and computing rectangular grids of arbitrary size with a node that implements the cut-through packet switching technology, a model is constructed in the form of a reenterable colored Petri net. The grid model consists of three main parts: a grid structure model, a switching node model, and a terminal device model that generates a user’s traffic. The listed models are presented in a single copy, in accordance with the rules of reenterable models construction, the main parameters of the models are the grid topology, traffic intensity and packet processing time. The advantages of a reenterable model for the properties investigation and the design of complex systems are shown. Models of guns were added for the investigation of ill-intentioned traffic influence. The results of the grid performance estimation and the average packet delivery time for nodes with different packet switching technology under working load conditions are presented. The behavior of the communication grid model under workload conditions and ill-intentioned traffic is investigated. The quality of service parameters were estimated and the efficiency of real-size communication and computing grids was investigated for different types and intensities of ill-intentioned traffic. It is shown that the Focus configuration leads the grid, with the node that implements the technology of cut-through packet switching, to a complete deadlock under workload conditions. The other configurations lead the grid to a complete deadlock only under peak load conditions, while in the workload environment the Side shot and Crossfire configurations reduce the average packet delivery time.