Energy consumption in networks on chip : efficiency and scaling

Computer architecture design is in a new era where performance is increased by replicating processing cores on a chip rather than making CPUs larger and faster. This design strategy is motivated by the superior energy efficiency of the multi-core architecture compared to the traditional monolithic CPU. If the trend continues as expected, the number of cores on a chip is predicted to grow exponentially over time as the density of transistors on a die increases. A major challenge to the efficiency of multi-core chips is the energy used for communication among cores over a Network on Chip (NoC). As the number of cores increases, this energy also increases, imposing serious constraints on design and performance of both applications and architectures. Therefore, understanding the impact of different design choices on NoC power and energy consumption is crucial to the success of the multi- and many-core designs. This dissertation proposes methods for modeling and optimizing energy consumption in multi- and many-core chips, with special focus on the energy used for communication on the NoC. We present a number of tools and models to optimize energy consumption and model its scaling behavior as the number of cores increases. We use synthetic traffic patterns and full system simulations to test and validate our methods. Finally, we take a step back and look at the evolution of computer hardware in the last 40 years and, using a scaling theory from biology, present a predictive theory for power-performance scaling in microprocessor systems

Design of complex integrated systems based on networks-on-chip: Trading off performance, power and reliability

The steady advancement of microelectronics is associated with an escalating number of challenges for design engineers due to both the tiny dimensions and the enormous complexity of integrated systems. Against this background, this work deals with Network-On-Chip (NOC) as the emerging design paradigm to cope with diverse issues of nanotechnology. The detailed investigations within the chapters focus on the communication-centric aspects of multi-core-systems, whereas performance, power consumption as well as reliability are considered likewise as the essential design criteria

Thermal aware design techniques for multiprocessor architectures in three dimensions

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Informática, Departamento de Arquitectura de Computadores y Automática, leída el 28-11-2013Depto. de Arquitectura de Computadores y AutomáticaFac. de InformáticaTRUEunpu

The Idea of a Christian social order : aspects of Anglican social thought in England, 1918-1945

The theological grounds for Christian concern with the social order were the major preoccupation of Anglican social thinkers in the years between the wars. For most of the period, social theology was world-affirming: it presented society as part of God's creative purpose and man as a social being who should not be treated in isolation from his earthly environment. It was argued that the idea of a Christian social order, once central to the Church's social teaching, had disappeared with the collapse of medieval Christendom. The recovery of that idea, and the formulation of its key principles in terms relevant to modern society, became the self-appointed task of the Christian social movement in the inter-war period. In the late 1930s, Anglican social theology underwent important changes as a result of the influence of nee-orthodox Protestantism. The emphases of crisis theology - God's otherness and man's sinfulness - called into question the assumptions that the pattern of God's creation was still discernible in the modern world and that man could work towards the establishment of God's kingdom on earth. Anglican social theology became increasingly existentialist. Its central theme was the duty of the Christian to obey God’s will in the context of everyday life; and the attempt to draw the outlines of a Christian social order was regarded with increasing suspicion. While earlier social theology had treated the social order as part of the sphere of the Church, crisis theology set the Church and the world in tension. The full Christian message, it was argued, was not strictly applicable to a world governed by secular assumptions; while the conduct of social and political life belonged properly to the State. The Church's legitimate role in social affairs was therefore limited. In a modern, pluralist society, Christian values could only be implemented when Christians fulfilled the normal duties of citizenship in the light of faith - attempting to translate the Christian law of love into terms of justice, its nearest equivalent in a sinful world. This required a sound knowledge of social and economic realities and a clear understanding of alternative courses of action. Christians who worked, with non-Christians, towards the achievement of justice and truth would help to guide society in a more Christian direction