Neeraj Kumar Goyal - Interconnection Network Reliability Evaluation

2 MIN Reliability Evaluation Techniques Review ( Chapter 3)Presents an overall view of the different reliability measures and their importance in evaluating the reliability can be reviewed with examples. A comprehensive review of the various approaches present for evaluation of different reliability measures is also presented. Based on the literature survey a few shortcomings are identified.

3 Terminal Reliability Analysis of Existing MIN Layouts ( Chapter 4)Networks such as telecommunication, transportation, power systems, integrated circuitry and computer communication systems are large and it becomes imperative for economic reasons and safety that these have high reliability. Reliability evaluation of such complex systems has not yet been perfected and there is a lot more that needs to be done. System reliability can be measured in terms of various paradigms such as two terminal, all-terminal and broadcast reliabilities.In this chapter, terminal reliability values of various recent and industrial used MINs topologies are evaluated and compared using existing simple and efficient path-set enumeration method. Path set and cut set techniques are the most widely used techniques for terminal pair reliability evaluation of communication networks as these techniques give a compact reliability expression in sum of disjoint product (SDP) form.These techniques first enumerate minimal path (or cut) set for the network and then evaluate reliability (or unreliability) expressions in the SDP form. Since enumeration of cut set also requires knowledge of basic paths of the network, the path set enumeration becomes a necessity for these techniques. Available disjoint and redundant paths of various existing MINs are evaluated by a simple and efficient path-set enumeration method based on hybrid multi-variable inversion (MVI) algorithm, which gives accurate reliability values. Present reliability evaluation paves the way of research focus on developing higher disjoint, reliable and highly fault-tolerant MINs than the existing topologies.

4 Comprehensive MIN Reliability Paradigms Evaluation ( Chapter 5)This chapter has attempted to evaluate comprehensive reliability paradigms of various recent MINs topologies available from literature using path tracing algorithm. With increasing number of input and output nodes in supercomputer environment reliability evaluation of multi-cast nodes is mandatory. In other words, a network has to transmit a signal or commodity between different pairs of nodes of a network simultaneously. Communication between multiple-sources multiple-destinations offers several advantages like increased performance, improved reliability and decreased costs through resource sharing.So we have extended the traditional reliability evaluation to include a new reliability measure as multisource multi-terminal reliability (MSMT). This chapter also evaluate MIN traditional reliability parameters (Two/broadcast/all terminal reliability) using conceptually simple and computationally efficient path tracing algorithm.

5 Dynamic Tolerant and Reliable Four Disjoint MIN Layouts ( Chapter 6)This chapter proposes two new fault tolerant and highly reliable multistage interconnection network layouts. Proposed 4-disjoint paths multistage interconnection networks (4DMINs) provide four disjoint paths between any source and destination node pair and provide dynamic rerouting between intermediate stages. Minimal paths of these 4DMIN have been evaluated and MINs performance evaluation has been done by calculating terminal reliability at assumed different switch reliabilities using existing approaches of sum of disjoint products method.Then a new layout design of fault tolerant reliable interconnection networks (RINs) is proposed. Proposed INs designed with highly adaptive reliable multipath dynamic routing behavior and fault tolerant capability in all the stages with suitable routing techniques. Proposed design can withstand dynamic switch failures in all the stages and provide more redundant paths to tackle such with higher reliability. They provide higher reliability and outperform other MINs.

Recently, research has been undertaken to improve interconnection networks for incoming the next generation of large parallel and distributed systems. Therefore, research focused on designing highly reliable and fault tolerant INs because they provide faster intercommunication capability. This book attempted towards the evaluation of reliability of interconnection networks and concentrates more on reliability evaluation of computer communication networks. But the methods have a good potential to explore new reliability evaluations using the algorithm presented in this work in other fields of interconnection networks systems such as water distribution systems, banking industry, and power distribution systems and any real time interconnection networks.

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