The Switcherland Distributed Computing System Michaela Blott, Hans Eberle, Erwin Oertli, Peter Ryser Swiss Federal Institute of Technology Institute of Computer Systems CH-8092 Zurich, Switzerland Abstract Switcherland is a distributed computing system optimized for running applications that process continuous data such as video and audio. For this purpose, Switcherland implements a communication model that offers quality of service (QoS) for a distributed shared memory architecture. QoS is provided in that memory can be accessed at guaranteed rates and in bounded time. Switcherland is based on a scalable interconnection structure that can serve as an I/O interconnection structure of a workstation as well as a network interconnection structure of a cluster of workstations. This paper gives an overview of the architecture and communication model implemented by Switcherland and describes the system components we are currently building. Keywords interconnection structure, quality of service, distributed shared memory, cluster computing.