Download or read book Analysis of Wormhole Routing in Multistage Interconnection Networks written by Phanindra K. Mannava and published by . This book was released on 1992 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Wormhole routing technique has gained a large following in the last few years, it has been hailed as the solution to various routing problems in the interconnection networks of multiprocessor systems. In this paper, an analytical model to calculate network latency and throughput in a multistage interconnection network using the wormhole routing technique is developed. This model is validated by simulations. The analytical results obtained from the model are also compared with those in multistage interconnection networks using circuit switching and packet switching."

Download or read book Performance Analysis of Wormhole Routing in Multicomputer Interconnection Networks written by Hamid Sarbazi-Azad and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Multiprocessor Mesh Interconnection Networks with Wormhole Routing written by University of Wisconsin--Madison. Computer Sciences Dept and published by . This book was released on 1991 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Wormhole routed Interconnection Networks in the Presence of Broadcast Traffic written by Alireza Shahrabi-Farahani and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Universal Routing Strategies for Interconnection Networks written by Christian Scheideler and published by Springer. This book was released on 2006-06-08 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the history and state of the art of universal routing strategies, which can be applied to networks independently of their respective topologies. It opens with a self-contained introduction, accessible also to newcomers. The main original results are new universal network protocols for store-and-forward and wormhole routing with small buffers or without buffers; these results are presented in detail and their potential applications are discussed. The book ends with a summary of open problems and an outlook of future directions in the area of routing theory.

Download or read book Performance Analysis of Wormhole routed Interconnection Networks in the Presence of Broadcast Traffic written by Alireza Shahrabi-Farahani and published by . This book was released on 2003 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Wormhole Switched Interconnection Networks with Virtual Channels and Finite Buffers written by Nassar Alzeidi and published by . This book was released on 2007 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance of Congestion Control Mechanisms in Wormhole Routing Networks written by and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "In order to minimize latency in high-speed interconnection networks, the wormhole routing technique can be employed. With this technique, a switch transmits an incoming message as soon as it receives it, without waiting for the entire message. The problem then is that a message stretches over several links and locks network resources, thus making a contention situation possible. Two principal congestion control mechansism can be considered, backpressure flow control and deflection routing. The performance of these mechanisms depends both on the traffic characteristics and on the network topology. In order to compare them, we study analytically the behavior of a wormhole routing network model with random input traffic under both policies. We estimate the probability of collision between messages and express the average message transit delay as a function of the offered load. Simulation provides a good confirmation for the analytical results. This study gives us an understanding of the behavior of the system under different resource management policies."

Download or read book Performance Analysis of Network Architectures written by Dietmar Tutsch and published by Springer Science & Business Media. This book was released on 2007-05-17 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three approaches can be applied to determine the performance of parallel and distributed computer systems: measurement, simulation, and mathematical methods. This book introduces various network architectures for parallel and distributed systems as well as for systems-on-chips, and presents a strategy for developing a generator for automatic model derivation. It will appeal to researchers and students in network architecture design and performance analysis.

Download or read book High Performance Computing written by Mateo Valero and published by Springer. This book was released on 2003-06-29 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: I wish to welcome all of you to the International Symposium on High Perf- mance Computing 2000 (ISHPC 2000) in the megalopolis of Tokyo. After having two great successes with ISHPC’97 (Fukuoka, November 1997) and ISHPC’99 (Kyoto, May 1999), many people have requested that the symposium would be held in the capital of Japan and we have agreed. I am very pleased to serve as Conference Chair at a time when high p- formance computing (HPC) has a signi?cant in?uence on computer science and technology. In particular, HPC has had and will continue to have a signi?cant - pact on the advanced technologies of the “IT” revolution. The many conferences and symposiums that are held on the subject around the world are an indication of the importance of this area and the interest of the research community. One of the goals of this symposium is to provide a forum for the discussion of all aspects of HPC (from system architecture to real applications) in a more informal and personal fashion. Today we are delighted to have this symposium, which includes excellent invited talks, tutorials and workshops, as well as high quality technical papers.

Download or read book Analysis and Design of Networks on Chip Under High Process Variation written by Rabab Ezz-Eldin and published by Springer. This book was released on 2015-12-16 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes in detail the impact of process variations on Network-on-Chip (NoC) performance. The authors evaluate various NoC topologies under high process variation and explain the design of efficient NoCs, with advanced technologies. The discussion includes variation in logic and interconnect, in order to evaluate the delay and throughput variation with different NoC topologies. The authors describe an asynchronous router, as a robust design to mitigate the impact of process variation in NoCs and the performance of different routing algorithms is determined with/without process variation for various traffic patterns. Additionally, a novel Process variation Delay and Congestion aware Routing algorithm (PDCR) is described for asynchronous NoC design, which outperforms different adaptive routing algorithms in the average delay and saturation throughput for various traffic patterns.

Download or read book Interconnection Networks written by Jose Duato and published by Morgan Kaufmann. This book was released on 2003 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foreword -- Foreword to the First Printing -- Preface -- Chapter 1 -- Introduction -- Chapter 2 -- Message Switching Layer -- Chapter 3 -- Deadlock, Livelock, and Starvation -- Chapter 4 -- Routing Algorithms -- Chapter 5 -- CollectiveCommunicationSupport -- Chapter 6 -- Fault-Tolerant Routing -- Chapter 7 -- Network Architectures -- Chapter 8 -- Messaging Layer Software -- Chapter 9 -- Performance Evaluation -- Appendix A -- Formal Definitions for Deadlock Avoidance -- Appendix B -- Acronyms -- References -- Index.

Download or read book Turn Prohibition Based Algorithms for Unicast Wormhole Routing in Multiprocessors and Computer Networks written by Mehmet Mustafa and published by . This book was released on 2006 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The problem of deadlock-free unicast routing in multicomputer interconnection networks and networks of workstations is investigated. We propose and evaluate several algorithms for improving end-to-end latency for message delivery in these networks. We show that these algorithms have higher performance than the well-known Up/Down and TP algorithms. Our principal goal in all proposed algorithms is to reduce the fraction of prohibited turns and thereby the average distance in the underlying topologies which results in improved sustained throughput in the network. Extensive simulation results comparing proposed algorithms and the previously known algorithms are presented. A new theoretical lower bound for the number of prohibited turns is derived. The new lower bound is more precise than earlier reported lower bound. We prove that if an undirected graph has N nodes, M edges, and a minimum degree of 0> 2, it must have at least M - N + 1 + (0 - 1)(0 - 2)/2 turns prohibited breaking all cycles while preserving connectivity. n the first proposed algorithm, called MTP, node selection rule changes so that it selects a minimum degree node with minimum degree neighbor(s). This is in contrast to the original TP algorithm which selects a node minimum degree node with neighbors of largest total degrees. Average network dilation is reduced from 24% in TP to 11% in MTP. Extensive simulation experiments for message delivery times demonstrate that MTP improves the average maximum sustained network throughput by up to 40%. The second algorithm, based on flow analysis, determines the weight of each edge as the number of number of concurrent messages that each edge can carry. Turns in the graph are then prescribed to have a weight equal to the sum of the weights of its edges. Weights of edges and turns are favorable attributes that the Weighted Turn Prohibition algorithm then minimizes. With this approach, we improve the maximum sustained network throughput by up to 44% with an average dilation of about 10%. The third algorithm, called Edge Deletion Algorithm provides an improvement of up to 50% for the maximum sustained network throughput with dilation between 8.4%--10%. The fourth algorithm called Cycle Breaking, CB, algorithm, which is operationally different than the original TP in which, node selection order is modified, principally to facilitate the proofs of its properties. This algorithm has no performance benefits over TP but we prove that it generates sets of prohibited turns that are irreducible. Using the CB algorithm, we also provide tighter upper bounds on the fraction of prohibited turns for regular topologies with small degree, such as degree 3 regular graphs, honeycomb meshes and tori. For several topologies, we show that CB algorithm is optimal in terms of minimizing the fraction of prohibited turns. From topological perspective, we recommend the use of honeycomb torus over two dimensional torus in regular interconnection networks. Since the MTP algorithm is found to be most cost effective for all topologies that we investigated, we recommend it as the algorithm of choice.

Download or read book Simple and Effective Adaptive Routing Algorithms Using Multi layer Wormhole Networks written by Kyung Min Su and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interconnection networks have been adopted in multicomputer systems, clusters, or chip multiprocessors (CMPs). Among various routing algorithms in interconnection networks, adaptive routing shows the best performance with most traffic types. In this paper, we propose new adaptive routing algorithms considering the remaining hops in addition to local network status. The proposed algorithms make adaptive decisions only when the remaining hops are less than some threshold and congestion is detected, or they do oblivious routing in other cases. As a result, the number of adaptive decisions is greatly reduced. Consequently our proposed algorithms have less adaptive overhead.

Download or read book Performance Analysis of Wormhole Routing in Binary de Bruijn Networks written by Sujatha Kilambi and published by . This book was released on 1997 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Virtual Channel Placement in Multicomputer Routers written by Younes M. Boura and published by . This book was released on 1995 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "An efficient switch architecture for wormhole switched interconnection networks is analyzed in this paper. The architecture is based on placing virtual channels (queues) between the multiplexors and demultiplexors of a conventional crossbar switch. Such an organization is referred to as middle buffering as opposed to input buffering, where virtual channels are placed at the input ports. It is shown analytically that middle buffering results in better utilization of the output ports and virtual channels of a communication switch. The effectiveness of middle buffering is attributable to clustering messages destined to the same output port. This clustering mechanism ensures that an output port is utilized whenever there is a message destined to that port. An analytical model for multistage interconnection networks using input-buffered and middle-buffered switches is developed. It captures the effect of including virtual channels on network performance. In addition, extensive simulation is conducted to assess the performance of input-buffered and middle-buffered router architectures in different network topologies. The effect of the message length and depth of virtual channels (number of buffers per virtual channel) is evaluated. The simulation study demonstrates that middle buffering with virtual channels provides better performance than input buffering with virtual channels in multistage interconnection networks, 2-dimensional meshes, and hypercubes. Empirical data suggest that virtual channel flow control favors small-sized messages for maximizing the utilization of physical channels, and network performance improves as the depth of virtual channels increases."

Download or read book Modeling Analysis and Optimization of Network on Chip Communication Architectures written by Umit Y. Ogras and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditionally, design space exploration for Systems-on-Chip (SoCs) has focused on the computational aspects of the problem at hand. However, as the number of components on a single chip and their performance continue to increase, the communication architecture plays a major role in the area, performance and energy consumption of the overall system. As a result, a shift from computation-based to communication-based design becomes mandatory. Towards this end, network-on-chip (NoC) communication architectures have emerged recently as a promising alternative to classical bus and point-to-point communication architectures. In this dissertation, we study outstanding research problems related to modeling, analysis and optimization of NoC communication architectures. More precisely, we present novel design methodologies, software tools and FPGA prototypes to aid the design of application-specific NoCs.