A Control-based Methodology for Power-performance Optimization in NoCs Exploiting DVFS

Networks-on-Chip (NoCs) are considered a viable solution to fully exploit the computational power of multi- and many-cores, but their non negligible power consumption requires ad hoc power-performance design methodologies. In this perspective, several proposals exploited the possibility to dynamically tune voltage and frequency for the interconnect, taking steps from traditional CPU-based power management solutions. However, the impact of the actuators, i.e. the limited range of frequencies for a PLL (Phase Locked Loop) or the time to increase voltage and frequency for a Dynamic Voltage and Frequency Scaling (DVFS) modules, are often not carefully accounted for, thus overestimating the benefits. This paper presents a control-based methodology for the NoC power-performance optimization exploiting the Dynamic Frequency Scaling (DFS). Both timing and power overheads of the actuators are considered, thanks to an ad hoc simulation framework. Moreover the proposed methodology eventually allows for user and/or OS interactions to change between different high level power-performance modes, i.e. to trigger performance oriented or power saving system behaviors. Experimental validation considered a 16-core architecture comparing our proposal with different settings of threshold-based policies. We achieved a speedup up to 3 for the timing and a reduction up to 33.17% of the power ∗ time product against the best threshold-based policy. Moreover, our best control-based scheme provides an averaged power-performance product improvement of 16.50% and 34.79% against the best and the second considered threshold-based policy setting

Professional self-regulation in a changing architecture of governance: comparing health policy in the UK and Germany

This chapter compares transformations in professional self-regulation in the UK and Germany through the lens of governance. We introduce an expanded concept of governance that includes national configurations of state–profession relationships and places selfregulation in the context of other forms of governance. The analysis shows that a general trend towards network governance plays out differently. In the UK, a plural structure of network governance and stakeholder arrangements is emerging in the context of stateled change. In Germany, partnership governance between sickness funds and medical associations shape the transformations and act as a barrier towards the entry of new players

A survey of dynamic power optimization techniques

One of the most important considerations for the current VLSI/SOC design is power, which can be classified into power analysis and optimization. In this survey, the main concepts of power optimization including the sources and policies are introduced. Among the various approaches, dynamic power management (DPM), which implies to change devices states when they are not working at the highest speed or at their full capacity, is the most efficient one. Our explanations accompanying the figures specify the abstract concepts of DPM. This paper briefly surveys both heuristic and stochastic policies and discusses their advantages and disadvantages

Comparing Regulatory Oversight Bodies Across the Atlantic: The Office of Information and Regulatory Affairs in the US and the Impact Assessment Board in the EU

‘Quis custodiet ipsos custodes?’ asked the Roman poet Juvenal – ‘who will watch the watchers, who will guard the guardians?’ As legislative and regulatory processes around the globe progressively put greater emphasis on impact assessment and accountability, we ask: who oversees the regulators? Although regulation can often be necessary and beneficial, it can also impose its own costs. As a result, many governments have embraced, or are considering embracing, regulatory oversight--frequently relying on economic analysis as a tool of evaluation. We are especially interested in the emergence over the last four decades of a new set of institutional actors, the Regulatory Oversight Bodies (ROBs). These bodies tend to be located in the executive (or sometimes the legislative) branch of government. They review the flow of new regulations using impact assessment and benefit-cost analysis, and they sometimes also appraise existing regulations to measure and reduce regulatory burdens. Through these procedures of regulatory review, ROBs have become an integral aspect not only of regulatory reform programs in many countries, but also of their respective administrative systems. Although most academic attention focuses on the analytical tools used to improve the quality of legislation, such as regulatory impact assessment (RIA) or benefit-cost analysis, this chapter instead identifies the key concepts and issues surrounding the establishment and operation of ROBs across governance systems. It does so by examining and comparing the oversight mechanisms that have been established in the United States and in the EU and by critically looking into their origins, rationales, mandates, institutional designs and scope of oversight

EVEREST IST - 2002 - 00185 : D23 : final report

Deliverable públic del projecte europeu EVERESTThis deliverable constitutes the final report of the project IST-2002-001858 EVEREST. After its successful completion, the project presents this document that firstly summarizes the context, goal and the approach objective of the project. Then it presents a concise summary of the major goals and results, as well as highlights the most valuable lessons derived form the project work. A list of deliverables and publications is included in the annex.Postprint (published version

Energy-Efficient Management of Data Center Resources for Cloud Computing: A Vision, Architectural Elements, and Open Challenges

Cloud computing is offering utility-oriented IT services to users worldwide. Based on a pay-as-you-go model, it enables hosting of pervasive applications from consumer, scientific, and business domains. However, data centers hosting Cloud applications consume huge amounts of energy, contributing to high operational costs and carbon footprints to the environment. Therefore, we need Green Cloud computing solutions that can not only save energy for the environment but also reduce operational costs. This paper presents vision, challenges, and architectural elements for energy-efficient management of Cloud computing environments. We focus on the development of dynamic resource provisioning and allocation algorithms that consider the synergy between various data center infrastructures (i.e., the hardware, power units, cooling and software), and holistically work to boost data center energy efficiency and performance. In particular, this paper proposes (a) architectural principles for energy-efficient management of Clouds; (b) energy-efficient resource allocation policies and scheduling algorithms considering quality-of-service expectations, and devices power usage characteristics; and (c) a novel software technology for energy-efficient management of Clouds. We have validated our approach by conducting a set of rigorous performance evaluation study using the CloudSim toolkit. The results demonstrate that Cloud computing model has immense potential as it offers significant performance gains as regards to response time and cost saving under dynamic workload scenarios.Comment: 12 pages, 5 figures,Proceedings of the 2010 International Conference on Parallel and Distributed Processing Techniques and Applications (PDPTA 2010), Las Vegas, USA, July 12-15, 201

Comparing Fiscal (De)Centralization and Multilevel Governments in Different Institutional Settings: A comparative study of Argentina and Denmark (2000-2010). European Diversity and Autonomy Papers EDAP 02/2020

The magnitude and complexity of the different processes of decentralization that took place around the world in the last five decades, involving all types of states (unitary and federal, as well), has challenged the concepts and the traditional distinction among the forms of the States. Therefore, to get a more complete and comprehensive idea of the whole phenomenon it is necessary to return to a theoretical discussion about decentralization and this requires also comparative studies between federal countries and unitary countries. With this background, the aim of this paper is twofold: first, it discusses some concepts surrounding the idea of decentralization and the different aspect it encompasses; second, it measures and compares institutional and fiscal decentralization in two countries with very different institutional settings, Argentina and Denmark, through six indicators, in order to explore some causal explanations of the role of subnational units in the process of decentralization