Efficient resources assignment schemes for clustered multithreaded processors

New feature sizes provide larger number of transistors per chip that architects could use in order to further exploit instruction level parallelism. However, these technologies bring also new challenges that complicate conventional monolithic processor designs. On the one hand, exploiting instruction level parallelism is leading us to diminishing returns and therefore exploiting other sources of parallelism like thread level parallelism is needed in order to keep raising performance with a reasonable hardware complexity. On the other hand, clustering architectures have been widely studied in order to reduce the inherent complexity of current monolithic processors. This paper studies the synergies and trade-offs between two concepts, clustering and simultaneous multithreading (SMT), in order to understand the reasons why conventional SMT resource assignment schemes are not so effective in clustered processors. These trade-offs are used to propose a novel resource assignment scheme that gets and average speed up of 17.6% versus Icount improving fairness in 24%.Peer ReviewedPostprint (published version

How many ladders of investment?

The ladder of investment is a regulatory approach that has been used by European National Regulatory Authorities (NRAs), in order to foster infrastructure competition among operators. the idea is to force incumbent operators to open several levels of access to their network in such a way that alternative operators may climb up the ladder, using more of his own infrastructure, and thus decreasing their reliance on the wholesale products of the incumbent operator. In order to market their own services, the alternative operator has to complement the wholesale resources acquired from the incumbent operator in regulated conditions. In principle, these complementary resources should be acquired in commercial conditions, but this is not always the case. For example, the alternative operator may use some physical space in the incumbent's premises to deploy their equipment, or rely on capacity services delivered by the incumbent operator in regulated conditions in order to reach specific geographical points. This suggests that analysing the degree of advance just in the main ladder of investment could suppose a gross underestimation of the reals degree of alternative infrastructure deployment by alternative operators. In this paper, we provide a theoretical explanation for this phenomenon with the help of the theory of the discovery market process and the theory of capital, as proposed by the Austrian School of Economics. The situation of the identified ladders of investment is assessed for the Spanish market, and some conclusions are drawn and applied in the form of policy recommendations for the NGN ladder of investment.Austrian School of Economics,discovery market process,complementarity,ladder of investment,capital structure,NGN

A review of ordering phenomena in iron-silicon steels

Silicon steel is an industrially-desired alloy of iron and silicon, characterised by soft magnetic properties, low eddy-current losses, and low magnetostriction. Silicon steels have narrow hysteresis cycles, making them particularly advantageous in applications using electromagnetic fields, such as transformers, generators, electric motor cores, and few other components in industry. Despite its incontestable industrial value, there is not much agreement on the atomic structure of silicon steel. Gaining better understanding of e.g. ordering processes in Fe-Si alloys could not only explain their magnetic properties, but also open opportunities to reduce their weaker characteristics, such as brittleness that adversely affects silicon steel workability and its associated high production costs. This review summarises the state-of-the-art knowledge about ordering in silicon steel and describes the most relevant experimental techniques used for studying its microstructure. In addition, the process of building the iron rich part of the Fe-Si phase diagram is explained. Lastly, the influence of order on the alloy's magnetic and mechanical properties is illustrated

Impact of the Uruguayan Conditional Cash Transfer Program

We analyze the impact of conditional cash payments on school enrollment, child labor and labor supply implemented between 2005 and 2007 to the poorest Uruguayan households. Targeting income discontinuities are not observed around the thresholds to particiConditional cash transfer program, targeting method, propensity score matching

Towards European monetary integration: the evolution of currency risk premium as a measure for monetary convergence prior to the implementation of currency unions

We assess monetary convergence preceding the implementation of the European Monetary Union (EMU) through Kalman filtering estimates of the risk premium of eleven forward exchange rates of European and non-European currencies. Since all participating currencies are in effect identical from inception of a currency union, the convergence process to such an identical status should be reflected in the participating currencies' risk premiums prior to monetary union implementation. Starting from this assumption, we show the paths followed by the participating currencies towards monetary union. We find that the co-movements of risk premiums among the preceding European Monetary System (EMS) currencies differ across time periods but display a tendency to convergence to the German mark’s risk premium up to EMU implementation. The paper also shows a clear pattern of asymmetry of the participating currencies in relation to the German mark. JEL Classification: F02, F31, F33, F36, G15, G18currency unions, European Monetary Union, foreign exchange risk premium

First Nature vs. Second Nature Causes: Industry Location and Growth in the Presence of an Open-Access Renewable Resource

In this paper we present a model integrating characteristics of the New Economic Geography, the theory of endogenous growth and the economy of natural resources. This theoretical framework enables us to study explicitly the effect of “first nature causes” in the concentration of economic activity, more specifically, the consequences of an asymmetrical distribution of natural resources. The natural resource we consider appears as a localized input in one of the two countries, giving firms located in that country a cost advantage. In this context, after a decrease in transport costs, firms decide to move to the country with the greatest domestic demand and market size, where they can take more advantage of increasing returns, despite the cost advantage of locating in the South, due to the presence of the natural resource.industrial location; endogenous growth; renewable resource; geography

Trade liberalisation and global-scale forest transition

In this paper, we develop a new theoretical model that explains the forest transition not at a local, but at a worldwide level, in a trade liberalisation scenario. Our model has economic geography foundations: transport costs affect the distribution of firms between countries. We also introduce a renewable natural resource used as an input by manufacturing firms. The results reproduce forest transition behaviour but at a global scale: a decrease in transport costs has a negative effect on the worldwide stock of the natural resource in the short-term, but in the long-term this initial effect is reversed as a consequence of industrial reorganisation between countries because of the change in transport costs.Forest transition; renewable resources; industrial location; geography; trade