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Finding the Arctic pole of inaccessibility

POLAR RECORD 2014年第1期50卷 86-91页

作者： Rees, Gareth Headland, Robert Scambos, Ted Haran, Terry Univ Cambridge Scott Polar Res Inst Cambridge CB2 1ER England Univ Colorado Natl Snow & Ice Data Ctr CIRES Boulder CO 80309 USA

The Arctic pole of inaccessibility (API), defined as the point on the Arctic Ocean that is farthest from any land, is commonly asserted to lie at 84 degrees 03 N, 174 degrees 51 W. We show that the true position is 85... 详细信息

关键词： Pole FINDINGS Arctic Ocean TRUE POSITIONS application programming interfaces Arctic American Petroleum Institute API Land AXIAL POWER INDICATOR

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Perils of faculty applicants

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CURRENT SCIENCE 2014年第6期107卷 937-938页

作者： Poduri, Chetan Datta 501 Highlight Haveli St 6 Hyderabad 500007 Andhra Pradesh India

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Software-Managed Power Reduction in Infiniband Links 43

Software-Managed Power Reduction in Infiniband Links

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43rd Annual International Conference on Parallel Processing (ICPP)

作者： Dickov, Branimir Pericas, Miquel Carpenter, Paul M. Navarro, Nacho Ayguade, Eduard Barcelona Supercomp Ctr Barcelona Spain Univ Politecn Cataluna BarcelonaTech E-08028 Barcelona Spain Tokyo Inst Technol Tokyo Japan

ISBN: (纸本)9781479956180

The backbone of a large-scale supercomputer is the interconnection network. As compute nodes become more energy-efficient, the interconnect is accounting for an increasing proportion of the total system energy consumption. The interconnect's energy consumption is, however, only starting to receive serious attention. Some hardware-based schemes have been proposed that exploit idle periods or low utilisation, either by turning off the links or by lowering the frequency and voltage. Although these schemes are effective in certain cases, they do not have enough global information about the application's communication behaviour to efficiently manage the network power consumption. This paper proposes an alternative approach: moving the intelligence into the PMPI layer of the MPI library, and using prediction to discover repetitive patterns in the application's communication behaviour. The core of the prediction algorithm is an n-gram extraction technique, which can accurately predict not only when a link will become unused but also when it will become active again, allowing lanes to be switched off during the idle periods and switched back on again in time to avoid incurring a significant performance degradation. Many HPC applications benefit from prediction, since they have repetitive computation and communication phases. By implementing the energy-saving mechanism inside the MPI library, existing MPI programs do not need to be modified. Using an event-driven simulator, driven by representative HPC workloads, we demonstrate average energy savings in Infiniband switches up to around 33%, while the average execution time increase is only up to 1%.

关键词： application program interfaces discrete event simulation interconnections mainframes power aware computing power consumption HPC applications HPC workloads Infiniband links Infiniband switches MPI library MPI programs PMPI layer communication behaviour compute nodes energy-saving mechanism event-driven simulator global information interconnection network large-scale supercomputer n-gram extraction technique network power consumption prediction algorithm total system energy consumption Arrays Energy consumption Pattern matching Power demand Prediction algorithms Program processors Supercomputers Prediction algorithms Power consumption power aware computing Interconnection networks supercomputer Mainframes application programming interfaces Program processors system energy consumption Power demand Infiniband Pattern matching discrete event simulation energy consumption power reduction

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Characterizing Mobile Open APIs in Smartphone Apps

Characterizing Mobile Open APIs in Smartphone Apps

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IFIP Networking Conference

作者： Zhang, Li Stover, Chris Lins, Amanda Buckley, Chris Mohapatra, Prasant Univ Calif Davis Dept Comp Sci Davis CA 95616 USA

ISBN: (纸本)9783901882586

Mobile applications used in smartphones are increasingly using Open APIs, and the trend is likely to continue in the foreseeable future. However, the performance of the Open APIs integrated in smartphone apps (Mobile Open APIs) remains hidden from app developers and app users because of the lack of a method to isolate the Open API calls from the whole app execution process. In this paper, we present the very first effort on characterizing Mobile Open APIs and analyzing their performance in terms of four metrics: response latency, network traffic, energy consumption, and CPU usage. We first develop APIExtractor (APIX), a software tool to extract the Mobile Open API calls as fine-grained as in the function level from Android app files (.apk). Then the popularity of the Open API functions were ranked by running APIX on 200 top popular apps downloaded from the Android app store. We then perform in-depth case studies on the the top 17 most popular Mobile Open APIs, by wrapping each of them in a specifically designed app (called APISymphone) and test the apps on both Wi-Fi and cellular network. Furthermore, we conduct a global scale measurements of the Mobile Open APIs by using Amazon Elastic Computing service. Our comprehensive measurement-based results provides very intriguing as well as interesting insights to the performance characteristics of Mobile APIs.

关键词： Apis Smartphone Mobile Level of function performance characteristics Mobile applications Wi-Fi Wrapping API application programming interfaces AXIAL POWER INDICATOR American Petroleum Institute Software Tools

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Applying Mobile application Development Life Cycle in the Development of Zakat Maal Mobile Web application Using JQuery Mobile Framework

Applying Mobile Application Development Life Cycle in the De...

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International Conference on Cyber and it Service Management (CITSM)

作者： Fenty, E. M. A. Hulliyah, Khodijah Ekafitri, Mayang Syarif Hidayatullah Islamic State Univ Fac Scince & Technol Dept Informat South Tangerang Indonesia

ISBN: (纸本)9781479979738

Zakat is the fourth pillar of Islam which is obligatory and must be implemented for those who can afford. Zakat maal is an obligation for those who have excess wealth of basic needs. Many Muslims are less so understand the charity and lack of socialization would be charity. This research aims to develop multi-platform zakat maal mobile web application using jQuery framework. It is built to deliver speed, stability, and an excellent cross-browser experience for web mobile visitor. Mobile application Development Life Cycle (MADLC) includes the following phases: identification, design, development, prototyping, testing, deployment and maintenance, used to support developer create a mobile application rapidly.

关键词： Internet humanities mobile computing query processing Islam JQuery mobile framework MADLC deployment phase MADLC design phase MADLC development phase MADLC identification phase MADLC maintenance phase MADLC prototyping phase MADLC testing phase Web mobile visitor Zakat maal mobile web application mobile application development life cycle application programming interfaces Knowledge engineering Maintenance engineering Mobile communication Servers Testing Unified modeling language Islam application programming interfaces Maintenance engineering UML Knowledge based engineering Humanities mobile communication query analysis Servers Mobile Computing Internets mobile Web Charities web applications

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A Human-Centric API for programming Socially Interactive Robots

A Human-Centric API for Programming Socially Interactive Rob...

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IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC)

作者： Diprose, J. P. Plimmer, B. MacDonald, B. A. Hosking, J. G. Univ Auckland Dept Comp Sci Auckland 1 New Zealand Univ Auckland Dept Elect & Comp Engn Auckland 1 New Zealand Australian Natl Univ Coll Engn & Comp Sci Canberra ACT 0200 Australia

ISBN: (纸本)9781479940356

Whilst robots are increasingly being deployed as social agents, it is still difficult to program them to interact socially. This is because current programming tools either require programmers to work at a low level or lack features needed to create certain aspects of social interaction. High level, domain specific tools with features designed specifically to meet the requirements of social interaction have the potential to ease the creation of social applications. We present a domain specific application programming interface (API) that is designed to meet the requirements of social interaction. The Cognitive Dimensions Framework was used as a design tool during the design process and the API was validated by implementing an exemplar application. The evaluation of the API showed that programmers with no robotics knowledge were positively impressed by the notation and that its organization, domain specific interfaces and object oriented nature positively affected several Cognitive Dimensions.

关键词： application programming interfaces api usability design cognitive dimensions human robot interaction social robot interaction humanoid robot

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OPEN SOURCE, 3-D TERRAIN VISUALIZATION ON A MOBILE DEVICE 33

OPEN SOURCE, 3-D TERRAIN VISUALIZATION ON A MOBILE DEVICE

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IEEE/AIAA 33rd Digital Avionics Systems Conference (DASC)

作者： Rios, Joseph Hogan, Patrick Gaskins, Tom Collins, David NASA Ames Res Ctr Moffett Field CA 94035 USA Tom Gaskins Inc Redmond WA USA Paul Collins Software Mill Creek WA USA

ISBN: (纸本)9781479950027

With the increase in computing power available to mobile devices has come the ability to efficiently display geographic data, which includes 3-dimensional terrain, virtually anywhere. In the work presented here, we provide a high-level overview of software for fetching, viewing, and interacting with geographic data on a mobile device. The software is a re-implementation of NASA's World Wind code targeted for Apple's iOS platform. The resulting code and application programming interface are available in an open source and extensible manner, which allows other developers to build computationally efficient and more custom applications for using 3D geographic data on the iOS platform than with other popular geographic visualization software. To demonstrate the utility of the software, we describe a tool targeted for use in general aviation that is intended to increase situational awareness while en route as well as enabling improved visualization and planning capabilities during pre-flight. To accomplish this, many of the features of the World Wind iOS implementation are exercised.

关键词： Data visualization NASA Servers Shape Software Three-dimensional displays Wind three-dimensional displays computer software Data visualisation Servers Wind National Aeronautics and Space Administration Mobile devices open source computer programs General aviation Visualization application programming interfaces situational awareness terrains

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A Comprehensive Mobile application Development and Testing Lifecycle

A Comprehensive Mobile Application Development and Testing L...

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IT Professional Conference (IT Pro)

作者： Vithani, Tejas Kumar, Anand BITS Pilani Dubai Campus Pilani U Arab Emirates

ISBN: (纸本)9781479988587

Software Development Lifecycle is crucial in Desktop or web application development. Mobile applications are being developed for deployment in smart phones. Looking at the rising need of mobile applications and the associated development complexity, it is imperative to have a dedicated framework lifecycle for mobile application -Mobile application Development Lifecycle (MADLC). The proposed lifecycle includes the following phases: Identification, Design, Development, Prototyping, Testing, Deployment and Maintenance. This lifecycle has been used for over a year in developing Android mobile applications. This lifecycle addresses some of the distinguishing characteristics of mobile applications like life span, complex functionalities, fewer physical interfaces, more number of screens for interaction, battery and memory usage, cross platform development and maintenance. The preliminary indicators are that this will benefit the mobile developers to follow the development process within MADLC to build robust and optimal control applications. In this research, Mobile application Development Lifecycle (MADLC) has been proposed to bring out a formalized lifecycle procedure, which will aid the mobile application developers in developing high-end apps. This lifecycle includes the following phases: Identification, Design, Development, Prototyping, Testing, Deployment and Maintenance. Lifecycle phases in MADLC have been discussed which consists of different tasks and activities that takes place during the process. Following MADLC in a mobile application developed provides a preliminary indicator that this will not only help the developers in planning their tasks well ahead, but also, the project manager will be able to plan its Project Life Cycle activities in a very efficient manner delivering the mobile business solutions on time. This lifecycle also addresses some of the distinguishing characteristics of mobile applications like life span, complex functionalities, fewer physi

关键词： Androids application programming interfaces Mobile communication Portable computers Software Spirals Testing Androids Androids application programming interfaces hand-held equipment Spiral mobile communication computer software Life cycle

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Demonstrating Improved application Performance Using Dynamic Monitoring and Task Mapping 16

Demonstrating Improved Application Performance Using Dynamic...

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16th IEEE International Conference on Cluster Computing (CLUSTER)

作者： Brandt, J. Devine, K. Gentile, A. Pedretti, K. Sandia Natl Labs POB 5800 Albuquerque NM 87185 USA

ISBN: (纸本)9781479955480

This work demonstrates the integration of monitoring, analysis, and feedback to perform application-to-resource mapping that adapts to both static architecture features and dynamic resource state. In particular, we present a framework for mapping MPI tasks to compute resources based on run-time analysis of system-wide network data, architecture-specific routing algorithms, and application communication patterns. We address several challenges. Within each node, we collect local utilization data. We consolidate that information to form a global view of system performance, accounting for system-wide factors including competing applications. We provide an interface for applications to query the global information. Then we exploit the system information to change the mapping of tasks to nodes so that system bottlenecks are avoided. We demonstrate the benefit of this monitoring and feedback by remapping MPI tasks based on route-length, bandwidth, and credit-stalls metrics for a parallel sparse matrix-vector multiplication kernel. In the best case, remapping based on dynamic network information in a congested environment recovered 48.9% of the time lost to congestion, reducing matrix-vector multiplication time by 7.8%. Our experiments focus on the Cray XE/XK platform, but the integration concepts are generally applicable to any platform for which applicable metrics and route knowledge can be obtained.

关键词： application program interfaces matrix algebra message passing parallel processing task analysis vectors Cray XE/XK platform MPI tasks application communication patterns application performance application-to-resource mapping architecture-specific routing algorithms credit-stalls metrics dynamic monitoring feedback parallel sparse matrix-vector multiplication kernel run-time analysis system-wide network data task mapping Bandwidth Dynamic scheduling Heuristic algorithms Measurement Monitoring Routing Xenon dynamic monitoring application programming interfaces message passing task analysis dynamic scheduling Feedback Heuristic algorithms matrix algebra PARALLEL PROCESSING (COMPUTERS) Xenon Bandwidth Network routing MAPPING(MATHEMATICAL) Computer based information systems

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A Unified programming Model for Intra- and Inter-Node Offloading on Xeon Phi Clusters 14

A Unified Programming Model for Intra- and Inter-Node Offloa...

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International Conference on High Performance Computing, Networking, Storage and Analysis

作者： Noack, Matthias Wende, Florian Steinke, Thomas Cordes, Frank Zuse Inst Berlin Takustr 7 D-14195 Berlin Germany GETLIG & TAR GbR D-14612 Falkensee Germany

ISBN: (纸本)9781479955008

Standard offload programming models for the Xeon Phi, e.g. Intel LEO and OpenMP 4.0, are restricted to a single compute node and hence a limited number of coprocessors. Scaling applications across a Xeon Phi cluster/supercomputer thus requires hybrid programming approaches, usually MPI+X. In this work, we present a framework based on heterogeneous active messages (HAM-Offload) that provides the means to offload work to local and remote (co) processors using a unified offload API. Since HAM-Offload provides similar primitives as current local offload frameworks, existing applications can be easily ported to overcome the single-node limitation while keeping the convenient offload programming model. We demonstrate the effectiveness of the framework by using it to enable a real-world application from the field of molecular dynamics to use multiple local and remote Xeon Phis. The evaluation shows good scaling behavior. Compared with LEO, performance is equal for large offloads and significantly better for small offloads.

关键词： application program interfaces coprocessors message passing parallel machines HAM-offload Intel LEO MPI+X OpenMP 4.0 Xeon Phi clusters compute node heterogeneous active messages hybrid programming approaches inter-node offloading intra-node offloading molecular dynamics scaling applications scaling behavior standard offload programming models supercomputer unified offload API unified programming model Computational modeling Coprocessors Data transfer Libraries Low earth orbit satellites Performance evaluation programming Coprocessors application programming interfaces UNLOADING programming close-orbit satellite data transmission supercomputer parallel machines message passing Computational modeling Molecular Dynamics Performance Evaluation Libraries

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