Author :
Molero, X. ; Silla, F. ; Santonja, V.
Abstract :
Networks of workstations (NOW) are becoming a very popular alternative to parallel computers for those applications with high needs of resources such as memory capacity processing power and input/output storage space. Typically, these networks connect workstations using irregular topologies, providing wiring flexibility, scalability, and incremental expansion capability required in this environment. In order to analyze and design these kind of systems it is necessary to have adequate tools. To address this problem, we have implemented a very flexible and easy to use NOW simulator. It is based on the one presented in (Silla, 1998; Silla and Duato, 1997; 1998) and it includes three more functionalities: it supports a technique for message fragmentation in packets, generates self-similar traffic, and also it can model networks with permanent faulted links or switches. We present this NOW simulator, the basic queueing models it is based on, its main internal organization, input parameters, output performance variables, and finally, we show several simple examples of performance measures obtained for, among others, message fragmentation, failures in links and switches, and self-similar traffic
Keywords :
digital simulation; packet switching; performance evaluation; telecommunication computing; telecommunication network routing; telecommunication traffic; workstation clusters; input output storage space; memory capacity; message fragmentation; network of workstations; network simulation; parallel computers; performance measures; queueing models; self-similar traffic; wiring flexibility; wormhole switching; Application software; Computational modeling; Computer applications; Computer networks; Concurrent computing; Network topology; Switches; Traffic control; Wiring; Workstations;
