Prefetching and Cache Management using Task Lifetimes

Task-based dataflow programming models and runtimes emerge as promising candidates for programming multicore and manycore architectures. These programming models analyze dynamically task dependencies at runtime and schedule independent tasks concurrently to the processing elements. In such models, cache locality, which is critical for performance, becomes more challenging in the presence of fine-grain tasks, and in architectures with many simple cores.

This paper presents a combined hardware-software approach to improve cache locality and offer better performance is terms of execution time and energy in the memory system. We propose the explicit bulk prefetcher (EBP) and epoch-based cache management (ECM) to help runtimes prefetch task data and guide the replacement decisions in caches. The runtimem software can use this hardware support to expose its internal knowledge about the tasks to the architecture and achieve more efficient task-based execution. Our combined scheme outperforms HW-only prefetchers and state-of-the-art replacement policies, improves performance by an average of 17%, generates on average 26% fewer L2 misses, and consumes on average 28% less energy in the components of the memory system.

Law in Northern Ireland

This is the latest edition of a book which is the standard introductory text for newcomers to the legal system of Northern Ireland. After explaining how law-making has evolved in Northern Ireland, particularly since the partition of Ireland in 1921, the book devotes separate chapters to the current constitutional position of Northern Ireland, to the making of legislation and case law for that jurisdiction, and to the influence of EU and European Convention law. It examines the principles of public law applying in Northern Ireland and outlines the role of some of the public authorities there. It then moves to chapters on criminal law and criminal procedure, followed by chapters on private law and civil procedure. It ends by examining the legal professions, legal education, the legal aid regimes and legal costs. There are also appendices with sample sources of law. Throughout the book, the focus is on conveying in comprehensible terms the essential features of this small, but historically very controversial, legal jurisdiction.

High-precision ultra-distal Holocene tephrochronology in North America

Far-travelled volcanic ashes (tephras) from Holocene eruptions in Alaska and the Pacific northwest have been traced to the easternmost extent of North America, providing the basis for a new high-precision geochronological framework throughout the continent through tephrochronology (the dating and correlation of tephra isochrons in sedimentary records). The reported isochrons are geochemically distinct, with seven correlated to documented sources in Alaska and the Cascades, including the Mazama ash from Oregon (w7600 years old) and the eastern lobe of the White River Ash from Alaska (~1150 years old). These findings mark the beginning of a tephrochronological framework of enhanced precision across North America, with applications in palaeoclimate, surface process and archaeological studies. The particle travel distances involved (up tow7000 km) also demonstrate the potential for continent-wide or trans-Atlantic socio-economic disruption from similar future eruptions.

Human Rights in Northern Ireland 2009-10

This report surveys the legislative and judicial developments in human rights law within Northern Ireland in the years 2009 and 2010, highlighting the respects in which the law was or was not in compliance with international human rights standards, in particular those laid down in the European Convention on Human Rights.

Repeal the HRA and Rely on the Common Law?

This piece contemplates whether the common law could fill the gaps in human rights protection if the UK's Human Rights Act 1998 were to be repealed. It looks at how the common law protected human rights before the Act came into force, what difference the Act has made, how the common law has become side-lined as a result, how in recent cases it has begun to play a more central role, and what more more needs to be done to develop it in ways which ensure that if the Human Rights Act were to be repealed it would not be particularly missed.

Human Rights in Northern Ireland in 2013

This is a report of the variety of developments in human rights law in Northern Ireland during the calendar year 2013. It pays particular attention to references to human rights issues in judicial decisions taken within Northern Ireland.