A Comparison of some recent Task-based Parallel Programming Models

The need for parallel programming models that are simple to use and at the same time efficient for current ant future parallel platforms has led to recent attention to task-based models such as Cilk++, Intel TBB and the task concept in OpenMP version 3.0. The choice of model and implementation can have a major impact on the final performance and in order to understand some of the trade-offs we have made a quantitative study comparing four implementations of OpenMP (gcc, Intel icc, Sun studio and the research compiler Mercurium/nanos mcc), Cilk++ and Wool, a high-performance task-based library developed at SICS. Abstract. We use microbenchmarks to characterize costs for task-creation and stealing and the Barcelona OpenMP Tasks Suite for characterizing application performance. By far Wool and Cilk++ have the lowest overhead in both spawning and stealing tasks. This is reflected in application performance when many tasks with small granularity are spawned where Cilk++ and, in particular, has the highest performance. For coarse granularity applications, the OpenMP implementations have quite similar performance as the more light-weight Cilk++ and Wool except for one application where mcc is superior thanks to a superior task scheduler. Abstract. The OpenMP implemenations are generally not yet ready for use when the task granularity becomes very small. There is no inherent reason for this, so we expect future implementations of OpenMP to focus on this issue

Computer simulation of the wool sale roster : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science in Agricultural Economics and Marketing at Massey University

New Zealand Wool Production and Disposal New Zealand is the third largest producer, and second largest exporter, of wool in the world. Over the past thirty years New Zealand's wool production has more than doubled. Since 1967/68, however, a marked decline has occurred in the rate at which wool production was increasing. This decline may be attributed primarily to present economic and managerial advantages of expanding beef production, rather than sheep production, in many parts of the country. Wool provides an important source of export earnings for New Zealand. Wool exports in 1970, valued at $204.5 million, constituted 19% of the total New Zealand earnings from export produce. 1.Source: Department of Statistics (3), p.567. This places wool third in importance, after meat and dairy produce, as an export earner. The bulk of the New Zealand wool clip is sold at auction in New Zealand and exported in the greasy state. The major markets for New Zealand wool are the United Kingdom, the U.S.A., Japan, Belgium, France, Italy, and the U.S.S.R. Local mill purchases take only a small proportion of the wool clip

Dimensional change of wool fabrics in the process of a tumble-drying cycle

The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.Currently domestic tumble dryers are popularly used for drying garments; however, excessive drying and the inappropriate way of tumble agitation could waste energy and cause damage to or the dimensional change of garments. Shrinkage of wool fabrics during tumble drying causes a serious problem for wool garments. The current study investigated the shrinkage of untreated and Chlorine-Hercosett–finished wool fabrics at different drying times. Temperature of air in the tumble dryer, temperature of fabric, moisture content of fabric, and dimensional change at different drying times were measured. For the duration of the tumble drying, the rise of fabric temperature and the reduction of moisture content on the wool fabric were investigated to explore their relationship to the shrinkage of wool fabrics in the tumble-drying cycle. It was found that the tumble-drying process can be divided into different stages according to the temperature change trend of wool fabrics. The shrinkage mechanisms of the untreated and the treated fabrics were different. The dimensional change of untreated wool fabric was caused mainly by felting shrinkage during tumble drying. Chlorine-Hercosett–finished wool fabric can withstand the tumble-drying process without noticeable felting shrinkage due to the surface modification and resin coating of surface scales of wool fibers. The finding from the current research provides further understanding of the shrinkage behavior of wool fabrics during the tumble-drying process, leading to optimizing operational parameters at specific stages of a tumble-drying cycle

An Investigation of Significant Factors Influencing Western Australian Wool Producers to Produce Wool: A Structural Equation Modelling Approach

Why Australian wool producers remained in the business despite the hardship they have experienced for much of the 1990s from low prices of wool? This question was raised frequently by research scientists and policymakers of the wool industry. A recent exploratory study gives a notion that Australian wool production could be a 'lifestyle' choice and/or a choice other than economic reasons. To validate this notion this paper investigates the factors that drive and motivate the Western Australian wool producers, as identified in the exploratory study, by applying a Structural Equation Modelling approach. An innovative mixed research method is adopted in this study. Telephone survey is conducted among a random selection of 290 wool producers in WA. The results suggest that despite some expectations lifestyle factor is not significant in influencing WA wool producers to produce wool. Income, input factor and personal motivation are significant predictors of wool production by WA wool producers. Implications of the results are discussed.Livestock Production/Industries, C21, L2, L7, Q10,

Effect of liquid nitrogen pre-treatment on various types of wool waste fibres for biogas production

This study investigated the role of liquid nitrogen (LN2) in increasing microbial accessibility of wool proteins for biogas production. It involves a mechanical size reduction of four different types of raw wool fibres, namely, Blackface, Bluefaced Leicester, Texel and Scotch Mule, in presence of liquid nitrogen, followed by the determination of the methane production potential of the pre-treated wool fibres. The highest methane yield, 157.3 cm3 g−1 VS, was obtained from pre-treated Scotch mule wool fibre culture, and represented more than 80% increase when compared to the yield obtained from its raw equivalent culture. The increase in biogas yield was attributed to the effectiveness of LN2 in enhancing particle size reduction and the consequent increase in wool solubility and bioavailability. Results also showed that LN2 pre-treatment can enhance size reduction but has limited effect on the molecular structure. The study also showed that the biogas potential of waste wool fibres varies with the type and source of wool

Understanding the World Wool Market: Trade, Productivity and Grower Incomes. Part 1: Introduction

This is the front matter and Chapter 1 of my PhD thesis Understanding the World Wool Market: Trade, Productivity and Grower Incomes, UWA, 2006. The full thesis is available as Discussion Papers 06.19 to 06.24. The core objective of this thesis is summarised by its title: “Understanding the World Wool Market: Trade, Productivity and Grower Incomes”. Thus, we wish to aid understanding of the economic mechanisms by which the world wool market operates. In doing so, we analyse two issues – trade and productivity – and their effect on, inter alia, grower incomes. To achieve the objective, we develop a novel analytical framework, or model. The model combines two long and rich modelling traditions: the partial-equilibrium commodity-specific approach and the computable-general-equilibrium approach. The result is a model that represents the world wool market in detail, tracking the production of greasy wool through five off-farm production stages ending in the production of wool garments.

A Multi-Disciplinary Approach For Determining Adoption Of Agricultural Price Risk Management Strategies

Australian wool producers have been slow to adopt price risk management strategies to stabilise the income from their wool sales. The highly volatile auction system accounts for 85% of raw wool sales while the remainder is sold by forward contract, futures and other hedging methods. Qualitative analysis was used to find behavioural factors associated with the adoption of price risk management strategies (specifically futures and forward contracts) for selling raw wool. Consideration was given to Diffusion of Innovations and the Theory of Planned Behaviour as theoretical frameworks in order to answer the research question: Are there any non-traditional behavioural factors that need to be incorporated into existing frameworks to determine adoption of price risk management strategies for selling raw wool? In contrast to these prominent theories, data from four focus groups conducted with wool producers in regional Western Australia showed that trust, habit and social cohesion were the major behavioural determinants that governed the adoption of price risk management strategies. The significance of this paper lies in its multi-disciplinary approach to understanding the dimensions of farm-level decision making.Qualitative analysis, trust, habit, social cohesion, forward contracts, wool., Agricultural Finance, Risk and Uncertainty,

Farmer-To-Farmer Advice: What's the Best Way to Sell Raw Wool in Australia?

Some 85% of all raw wool produced in Australia is sold on the open-cry auction system (Bolt 2004). Current debate among wool growers highlighted the need to explore other methods available and, of these, determine what are the most preferred. Four focus groups were conducted in regional Western Australia to ascertain primary producers' opinions on the options available for selling their raw wool. Focus group p articipants were given a series of scenarios to brainstorm, these focused on offering advice to a new neighbour who had n ever grown wool. Results of the research showed that auctioning wool via the services of a broker is by far the preferred selling method. Forward contracting and internet-based selling were options that were unfamiliar but worthy of trial while futures and op tions trading, value-added selling and selling direct to mills were the least favoured methods. Further to this it was found that producers are willing to try selling methods that shorten the wool supply chain and they also favour relationship-based systems.Livestock Production/Industries, Marketing,