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This report reviews the subject of multiprocessor/multicomputer systems and optimal loading techniques. This report covers: 1. The interrelationship of Multiprocessor/Multicomputer (Multiple Instruction Stream Multiple Data Stream, MIMD) systems and other architectures by presenting a categorization of computer architectures. 2. Comparison of Multiprocessor/Multicomputer (MIMD), versus Parallel Processor (Single Instruction stream Multiple Data stream, SIMD) systems. 3. Multiprocessor/Multicomputer problems, pitfalls and new goals. 4. Investigation of loading techniques by reviewing particular MIMD executive designs.

A methodology is proposed for designing performance optimized computer systems. The methodology uses software tools created for performance monitoring and evaluation of parallel programs, replacing actual hardware with a simulator modeling the hardware under development. We claim that a software environment can help hardware designers to make decisions on the architectural design level. A simulator executes real programs and provides access to performance monitors from user's code. The performance monitoring system collects data traces when running the simulator and the performance analysis module extracts performance data of interest, that are later displayed with visualization tools. Key features of our methodology are "plug and play" simulation and modeling hardware/software interaction during the process of hardware design. The ability to use different simulators gives the user flexibility to configure the system for the required functionality, accuracy and simulation performance. Evaluation of hardware performance based on results obtained by modeling hardware/software interaction is crucial for designing performance optimized computer systems. We have developed a software system, based on our design methodology, for performance evaluation of multicomputer interconnection networks. The system, called the Parsim Common Environment (PCE), consists of an instrumented network simulator that executes assembly language instructions, and performance analysis and visualization modules. Using PCE we have investigated a specific network design example. The system helped us spot performance problems, explain why they happened and find the ways to solve them. The obtained results agreed with observations presented in the literature, hence validating our design methodology and the correctness of the software performance evaluation system for hardware designs. Using software tools a designer can easily check different design options and evaluate the obtained performance results without the overhead of building expensive prototypes. With our system, data analysis that required 10 man-hours to complete manually took just a couple of seconds on a Sparc-4 workstation. Without experimentation with the simulator and the performance evaluation environment one might build an expensive hardware prototype, expecting improved performance, and then be disappointed with poorer results than expected. Our tools help designers spot and solve performance problems at early stages of the hardware design process.

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (p. 127-134).

Thesis (M.S.)--Rochester Institute of Technology, 2008. / Typescript. Includes bibliographical references (leaf 49).

Thesis (M.Sc. (Information Systems)) - Rhodes University, 2008.

Pa., Carnegie Mellon Univ., Diss.,--Pittsburgh.

Thesis (M.S.)--The University of North Carolina at Greensboro, 2008. / Directed by Shan Suthaharan; submitted to the Dept. of Computer Science. Title from PDF t.p. (viewed Aug. 25, 2009). Includes bibliographical references (p. 65-67).

Traditional network monitoring techniques suffer from a number of limitations. They are usually designed to solve the most general case, and as a result often fall short of expectation. This project sets out to provide the network administrator with a set of alternative tools to solve specific, but common, problems. It uses the network at Rhodes University as a case study and addresses a number of issues that arise on this network. Four problematic areas are identified within this network: the automatic determination of network topology and layout, the tracking of network growth, the determination of the physical and logical locations of hosts on the network, and the need for intelligent fault reporting systems. These areas are chosen because other network monitoring techniques have failed to adequately address these problems, and because they present problems that are common across a large number of networks. Each area is examined separately and a solution is sought for each of the problems identified. As a result, a set of tools is developed to solve these problems using a number of novel network monitoring techniques. These tools are designed to be as portable as possible so as not to limit their use to the case study network. Their use within Rhodes, as well as their applicability to other situations is discussed. In all cases, any limitations and shortfalls in the approaches that were employed are examined.

Orientadores: Christian Rodolfo Esteve Rothenberg, Maurício Ferreira Magalhães / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-23T02:35:23Z (GMT). No. of bitstreams: 1 Cabral_CarlosManuelSilvestre_M.pdf: 7624416 bytes, checksum: f758b7fa3db350c16219153bff10654b (MD5) Previous issue date: 2013 / Resumo: A pesquisa experimental em Redes Orientadas a Conteúdo (ROCs) é crucial para a validação de novas propostas arquiteturais que trazem o conteúdo como o elemento central das redes. Essa dissertação apresenta uma nova ferramenta de prototipagem rápida para o modelo CCN (Content-Centric Networking), o Mini-CCNx, que visa preencher uma lacuna existente entre as plataformas experimentais atualmente disponíveis. Usando emulação baseada em contêineres e técnicas de isolamento de recursos, o Mini-CCNx aparece como uma ferramenta flexível, escalável, com baixo custo e alta fidelidade de desempenho possibilitando experimentos em redes emuladas com centenas de nós CCN em um simples laptop. Assim, esse trabalho de Mestrado traz como principal contribuição a disponibilização do Mini-CCNx, o primeiro emulador genérico especificamente focado para o desenvolvimento e testes de propostas para o modelo CCN. O Mini-CCNx é publicado com seu código aberto e documentação online e, portanto, pode ser melhorado e estendido por qualquer pesquisador da área. Essa dissertação apresenta 18 experimentos utilizando o Mini- CCNx, abrangendo desde análises de escalabilidade e coerência até a distribuição de vídeo e protocolos de roteamento. A reprodução de comportamentos observados em redes reais utilizando o emulador também é uma contribuição importante, pois mostra que se pode utilizar o Mini-CCNx para detectar eventuais falhas em aplicações e algoritmos antes dos testes em testbeds reais, que certamente são mais complexos e custosos quando comparados ao ambiente emulado. Porém, as características de baixo custo e flexibilidade indicam que o Mini-CCNx também pode ser utilizado em atividades de ensino como uma ferramenta prática de aprendizado e introdução ás ROCs e ao modelo CCN / Abstract: Experimental research in Information-Centric Networking (ICN) is crucial to the evaluation of new architectural proposals that bring named pieces of content as the main element of networks. This thesis presents a new fast prototyping tool for the CCN (Content-Centric Networking) model, Mini-CCNx that aims at filling an existing gap in generally available experimental platforms. Using container-based emulation and resource isolation techniques, Mini-CCNx appears as a flexible, scalable, high-fidelity, and low-cost tool that enables experiments on emulated networks with hundreds of CCN nodes in a commodity laptop. Therefore, this Master's project's main contribution is making Mini-CCNx, the first generic emulator focused on the development and evaluation of new proposals for the CCN model, available. Mini-CCNx is opensource and its documentation is publicly available online so it can be extended by any researcher in the area. This thesis presents 18 experiments using Mini-CCNx, ranging from scalability and coherence analysis to video distribution and routing protocols. The reproduction of real networks behavior using the emulator is also an important contribution because it shows one can use Mini-CCNx to detect flaws in applications or algorithms prior to real testbeds tests, which are certainly more complex and costly when compared to the emulated environment. Finally, Mini-CCNx's low-cost and flexibility indicate it can also be used in teaching activities as a practical ICN and CCN learning tool / Mestrado / Engenharia de Computação / Mestre em Engenharia Elétrica