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Capsule Reviews - The Capsule Reviews are intended to provide a short succinct review of each paper in the issue in order to bring it to a wider readership. The Capsule Reviews were compiled by Fairouz Kamareddine. Professor Kamareddine is an Associate Editor of The Computer Journal and is based in the Department of Mathematical and Computer Sciences at Heriot-Watt University, Edinburgh, UK. ...
Feed Source: comjnl.oxfordjournals.org

On the Acceleration of Wavefront Applications using Distributed Many-Core Architectures - In this paper we investigate the use of distributed graphics processing unit (GPU)-based architectures to accelerate pipelined wavefront applicationsmdash;a ubiquitous class of parallel algorithms used for the solution of a number of scientific and engineering applications. Specifically, we employ a recently developed port of the LU solver (from the NAS Parallel Benchmark suite) to investigate the performance of these algorithms on high-performa...
Feed Source: comjnl.oxfordjournals.org

Performance Characteristics of Hybrid MPI/OpenMP Implementations of NAS Parallel Benchmarks SP and BT on Large-Scale Multicore Clusters - The NAS Parallel Benchmarks (NPB) are well-known applications with fixed algorithms for evaluating parallel systems and tools. Multicore clusters provide a natural programming paradigm for hybrid programs, whereby OpenMP can be used with the data sharing with the multicores that comprise a node, and MPI can be used with the communication between nodes. In this paper, we use Scalar Pentadiagonal (SP) and Block Tridiagonal (BT) benchmarks of MPI N...
Feed Source: comjnl.oxfordjournals.org

Performance Analysis and Optimization of the OP2 Framework on Many-Core Architectures - This paper presents a benchmarking, performance analysis and optimization study of the OP2 lsquo;activersquo; library, which provides an abstraction framework for the parallel execution of unstructured mesh applications. OP2 aims to decouple the scientific specification of the application from its parallel implementation, and thereby achieve code longevity and near-optimal performance through re-targeting the application to execute on different ...
Feed Source: comjnl.oxfordjournals.org

SST: A Scalable Parallel Framework for Architecture-Level Performance, Power, Area and Thermal Simulation - In this paper, we describe the integrated power, area and thermal modeling framework in the structural simulation toolkit (SST) for large-scale high performance computer simulation. It integrates various power and thermal modeling tools and computes run-time energy dissipation for core, network on chip, memory controller and shared cache. It also provides functionality to update the leakage power as temperature changes. We illustrate the utiliza...
Feed Source: comjnl.oxfordjournals.org

Benchmarking Energy Efficiency, Power Costs and Carbon Emissions on Heterogeneous Systems - With the advent of heterogeneous computing systems consisting of multi-core central processing units (CPUs) and many-core graphics processing units (GPUs), robust methods are needed to facilitate fair benchmark comparisons between different systems. In this paper, we present a benchmarking methodology for measuring a number of performance metrics for heterogeneous systems. Methods for comparing performance and energy efficiency are included. Con...
Feed Source: comjnl.oxfordjournals.org

Memory Trace Compression and Replay for SPMD Systems Using Extended PRSDs - Concurrency levels in large-scale supercomputers are rising exponentially, and shared-memory nodes with hundreds of cores and non-uniform memory access latencies are expected within the next decade. However, even current petascale systems with tens of cores per node suffer from memory bottlenecks. As core counts increase, memory issues will become critical for the performance of large-scale supercomputers. Trace analysis tools are thus vital for...
Feed Source: comjnl.oxfordjournals.org

Leveraging Service Discovery in MANETs with Mobile Directories - This paper advances a novel approach that facilitates the location of services and/or digital assets advertised by directories in a Mobile Ad hoc Network. The proposed Service Directory Placement Protocol (SDPP) improves scalability and reduces packet traffic overhead by advancing a multi-directory extension of an earlier approach that relied on the migration of a single directory through the network. This investigation demonstrates that modelli...
Feed Source: comjnl.oxfordjournals.org

Evaluation of a Java Ahead-of-Time Compiler for Embedded Systems - Java embedded systems often include Java middleware classes installed on the client device. For higher performance, they can be compiled into machine code before runtime using an ahead-of-time compiler (AOTC). There are many approaches to AOTC, yet a bytecode-to-C (b-to-C) AOTC which translates the bytecode into the C code and then compiles it using an existing optimizing compiler such as gcc would be the most straightforward one. This paper exp...
Feed Source: comjnl.oxfordjournals.org

DNA Profiles Link Dope to Its Source - PFONT face=Verdana size=2STRONG09 Jul 03/STRONG/FONT/P PFONT face=Verdana size=2Forensic scientists in the U.S. are applying DNA fingerprinting methods to the cannabis plant. They say the technique, which is being used to create a database of DNA profiles of different marijuana plants, will help them to trace the source of any sample./FONT/P PFONT face=Verdana size=2It links everybody together: the user, the distributor, the grower, says the data...
Feed Source: www.newscientist.com

Mathematics: Does the Proof Stack Up? - PFONT face=Verdana size=2STRONGby George Szpiro/STRONG/FONT/P PFONT face=Verdana size=2STRONG03 Jul 03/STRONG/FONT/P PFONT face=Verdana size=2Just under five years ago, Thomas Hales made a startling claim. In an e-mail he sent to dozens of mathematicians, Hales declared that he had used a series of computers to prove an idea that has evaded certain confirmation for 400 years. The subject of his message was Keplers conjecture, proposed by the Germ...
Feed Source: www.nature.com

Scientists Discover Planetary System Similar to Our Own - TABLE cellSpacing=0 cellPadding=0 width=220 align=right border=0 TBODY TR TD vAlign=top width=200BRBRBR P class=captionA href=http://www.nsf.gov/od/lpa/news/03/images/extrasol2.jpgIMG height=191 alt=image of a possible scene from a moon orbiting the extra-solar planet src=http://www.nsf.gov/od/lpa/news/03/images/extrasol2_th.jpg width=250 border=0/ABR!-- Insert captions and credit information in the CAPTION and NAME fields. --FONT face=VerdanaFON...
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Hacker How-To Good Summer Reading - PSPAN class=pgToolsLFONT face=Verdana size=2STRONGby /STRONG/FONTA title=Send feedback and comments to Michelle Delio href=http://www.wired.com/news/feedback/mail/1,2330,167,00.htmlFONT face=Verdana size=2STRONGMichelle Delio/STRONG/FONT/A/SPAN/P PSPAN class=pgToolsLFONT face=Verdana size=2STRONG27 Jun 03/STRONG/FONT/SPANSPAN class=pgToolsL/P P class=reviewed-titleFONT face=Verdana size=2STRONGEMA href=http://www.amazon.com/exec/obidos/ASIN/19318...
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