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Idle Period Propagation in Message-Passing Applications

Idle Period Propagation in Message-Passing Applications

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IEEE International Conference on High Performance comput.ng and Communications

作者： Ivy Bo Peng Stefano Markidis Erwin Laure Gokcen Kestor Roberto Gioiosa Dept. of Comput. Sci. & Technol. KTH R. Inst. of Technol. Stockholm Sweden Comput. Sci. & Math. Div. Pacific Northwest Nat. Lab. Richland WA USA

ISBN: (纸本)9781509042982

Idle periods on different processes of Message Passing applications are unavoidable. While the origin of idle periods on a single process is well understood as the effect of system and architectural random delays, yet it is unclear how these idle periods propagate from one process to another. It is important to understand idle period propagation in Message Passing applications as it allows application developers to design communication patterns avoiding idle period propagation and the consequent performance degradation in their applications. To understand idle period propagation, we introduce a methodology to trace idle periods when a process is waiting for data from a remote delayed process in MPI applications. We apply this technique in an MPI application that solves the heat equation to study idle period propagation on three different systems. We confirm that idle periods move between processes in the form of waves and that there are different stages in idle period propagation. Our methodology enables us to identify a self-synchronization phenomenon that occurs on two systems where some processes run slower than the other processes.

关键词： Message Passing applications self-synchronization idle period propagation process imbalance

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Selecting Nodes with Inhomogeneous Profile for Labeling for Network-Based Semi-supervised Learning

Selecting Nodes with Inhomogeneous Profile for Labeling for ...

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BRICS Congress on comput.tional Intelligence & Brazilian Congress on comput.tional Intelligence (BRICS-CCI & CBIC)

作者： Bilzã Araújo Liang Zhao Dept. of Comput. Sci. ICMC - Univ. of Sao Paulo Säo Carlos Brazil Dept. of Comput. & Math. FFCLRP - Univ. of Sao Paulo Ribeiräo Preto Brazil

Network-based Semi-Supervised Learning (NbSSL) propagates labels in affinity-networks by taking advantage of the network topology likewise information spreading in trust networks. In NbSSL, not only the unlabeled data instances, but also the labeled ones, are able to bias the classification performance. Herein, we show some results and discussion on this phenomenon. Even the suitability of the free parameters of the NbSSL algorithms varies according to the available labeled data. Indeed, we propose a method for selecting representative data instances for labeling for NbSSL. In our sense the represent ability of a node is related to how inhomogeneous is its profile concerning the whole network. The proposed method uses Complex Networks centrality measures to identify which nodes present inhomogeneous profile. We perform this study by applying three NbSSL algorithms on Girvan-Newman and Lancichinetti-Fortunato-Radicchi modular networks. In the former, the nodes with high clustering coefficient are good representatives of the data and the nodes with high betweenness are the good representatives ones in the later. A high clustering coefficient means that the node lies in a much connected motif (clique) whereas a high betweenness means that the node lies interconnecting the modular structures. These results reveal the ability to improve the NbSSL performance by selecting representative data instances for manual labeling.

关键词： Nonhomogeneous media Labeling Complex networks Semisupervised learning Clustering algorithms Machine learning algorithms Standards

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A network management framework for multi-layered network survivability: An overview 7

A network management framework for multi-layered network sur...

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7th IEEE/IFIP International Symposium on Integrated Network Management, IM 2001

作者： Medhi, D. Jain, S. Shenoy Ramam, D. Thirumalasetty, S.R. Saddi, M. Summa, F. Comput. Sci. Telecommun. Program Missouri Univ. Kansas CityMO United States *** United States Ciena Corporation United States Calix Networks United States Informix Corporation United States

ISBN: (纸本)0780367197

We consider an interconnected network environment where one network can act as a 'provider' or 'service' network to the 'user' network or a collection of 'user' networks. In such an environment, a major failure in a provider network can affect the user networks. Very often, failure management is addressed in each individual network domain independently. We present an overview of a loosely-coupled network management framework through the development of a multi-layered network manager of managers concept for correlated management, for failure cases that can not be addressed by each component network individually. © 2001 IEEE.

关键词： Managers

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Models for the Automated Integration of Service-Oriented Software Systems

Models for the Automated Integration of Service-Oriented Sof...

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International Workshop on Modeling in Software Engineering (MISE)

作者： Paola Inverardi Dept. of Inf. Eng. Comput. Sci. & Math. Univ. of L'Aquila L'Aquila Italy

ISBN: (纸本)9781538604274

In the near future we will be surrounded by a virtually infinite number of software applications that provide services in the digital space. This situation radically changes the way software will be produced and used: (i) software is increasingly produced according to specific goals and by integrating existing software; (ii) the focus of software production will be shifted towards reuse of third-parties software, typically black-box, that is often provided without a machine readable documentation. The evidence underlying this scenario is that the price to pay for this software availability is a lack of knowledge on the software itself, notably on its interaction behaviour A producer will operate with software artifacts that are not completely known in terms of their functional and non-functional characteristics. The general problem is therefore directed to the ability of devising (architectural/component) models that will let the artifacts interact to reach the goal. This talk focuses on models, techniques and tools for integration code and component interaction protocols which allow to deal with partial knowledge and automatically produce correctby- construction service-oriented systems with respect to functional and non functional goals.

关键词： comput.tional modeling math.matical model Software systems comput.r sci.nce Protocols

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An Instructional Unit for Teaching Project Management Tools Aligned with PMBOK

An Instructional Unit for Teaching Project Management Tools ...

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Conference on Software Engineering Education & Training (CSEE&T)

作者： Rafael Queiroz Goncalves Christiane Gresse Von Wangenheim Grad. Program on Comput. Sci. Federal University of Santa Catarina (UFSC) Florianópolis SC Brazil Grad. Program on Comput. Sci. Federal University of Santa Catarina (UFSC) Florianopolis Brazil

Project Management (PM) tools are necessary to manage contemporary software projects. comput.r professionals need to know how to use these tools, and higher-education comput.r courses teach their usage. Therefore, educators often adopt general usage tools, such as MS Project. However, as such tools lack didactic features, educational PM tools have been developed. Yet, previous studies have shown that even instructional units (IU) based on such educational PM tools do not cover the entire PM process as defined by PMBOK. This article presents an instructional unit based on an open-source educational PM tool, dotProject+, using the tool to support learning a large part of the PM process. We describe the instructional design process used to develop the IU, as well as the evaluation of the IU in a series of case studies. The results indicate that this IU contributes to student learning and assists teachers.

关键词： Education Open source software Organizations Software engineering Project management comput.rs

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A Performance Prediction Approach for MPI Routines on Multi-clusters

A Performance Prediction Approach for MPI Routines on Multi-...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： Sami Achour Wahid Nasri Higher Inst. of Appl. Math. & Comput. Sci. Kairouan Tunisia Higher School of Sciences and Techniques Tunis Tunisia

Performance is one of the key features of parallel and distributed comput.ng systems. For that reason, a significant research effort was invested in the development of approaches in the area of performance modeling and prediction. Since many parallel applications from sci.ntific comput.ng use MPI communication operations to distribute or collect data, we present in this paper a novel (off-line) approach that addresses the performance prediction of MPI routines in multi-clusters platforms. The main objective of this approach is to predict accurately and efficiently the performance of a given routine. Our solution is based principally on models for point to point (P2P) MPI routines which are obtained after a short profiling procedure. Since collective communication routines are composed of P2P routines, the performance prediction of the formers is done on the basis of a rapid emulation of these routines and on an evaluation of P2P routines models. Experimental results obtained on a grid platform demonstrated the interest of the proposed approach.

关键词： Predictive models Time measurement Measurement uncertainty Size measurement Emulation Accuracy Benchmark testing

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Monotonicity of fixation probability of evolutionary dynamics on complex networks

Monotonicity of fixation probability of evolutionary dynamic...

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38th Annual Conference on IEEE Industrial Electronics Society, IECON 2012

作者： Tan, Shaolin Lu, Jinhu Yu, Xinghuo Hill, David Inst. Syst. Sci. Acad. Math. Syst. Sci. Chin. Acad. Sci. Beijing 100190 China Sch. Electr. Comput. Eng. RMIT University Melbourne VIC 3001 Australia Sch. Electr. Inf. Eng. University of Sydney Sydney NSW 2006 Australia

ISBN: (纸本)9781467324212

It is well known that the evolutionary dynamics characterizes the process of competition and evolution of phenotypes and behaviors in a population. Intuitively, the individual with a higher fitness will have a higher survival probability, which should be reflected in the evolutionary dynamic model. However, due to the comput.tional complexity of fixation probability, it is very difficult to prove the existence of this property in evolutionary dynamics on complex networks. This paper aims at providing a rigorously theoretical proof for the global existence of such property in the local evolutionary dynamics by using the coupling and splicing techniques. In particular, we also prove that the fixation probability is monotone increasing for the initial nodes set of mutants. Numerical simulations are also given to validate the proposed approaches. © 2012 IEEE.

关键词： Complex networks

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A Blind Antenna Selection Scheme for Single-cell Uplink Massive MIMO

A Blind Antenna Selection Scheme for Single-cell Uplink Mass...

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IEEE Globecom Workshops

作者： Khalil Elkhalil Abla Kammoun Tareq Y. Al-Naffouri Mohamed-Slim Alouini Comput. Electr. & Math. Sci. & Eng. (CEMSE) Div King Abdullah Univ. of Sci. & Technol. Thuwal Saudi Arabia

ISBN: (纸本)9781509024834

This paper considers the uplink of a single-cell large-scale multiple-input multiple output (MIMO) system in which m mono-antenna users communicate with a base station (BS) outfitted by n antennas. We assume that the number of antennas at the BS and that of users take large values, as envisioned by large-scale MIMO systems. This allows for high spectral efficiency gains but obviously comes at the cost of higher complexity, a fact that becomes all the more critical as the number of antennas grows large. To solve this issue is to choose a subset of the available n antennas. The subset must be carefully chosen to achieve the best performance. However, finding the optimal subset of antennas is usually a difficult task, requiring one to solve a high dimensional combinatorial optimization problem. In this paper, we approach this problem in two ways. The first one consists in solving a convex relaxation of the problem using standard convex optimization tools. The second technique solves the problem using a greedy approach. The main advantages of the greedy approach lies in its wider scope, in that, unlike the first approach, it can be applied irrespective of the considered performance criterion. As an outcome of this feature, we show that the greedy approach can be applied even when only the channel statistics are available at the BS, which provides blind way to perform antenna selection.

关键词： Massive MIMO antenna selection convex optimization greedy algorithm blind selection random matrix theory

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A genetic algorithm for file and task placement in a distributed system

A genetic algorithm for file and task placement in a distrib...

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IEEE International Conference on Evolutionary comput.tion

作者： A.L. Corcoran D.A. Schoenefeld Dept. of Math. & Comput. Sci. Tulsa Univ. OK USA Department of Mathematical and Computer Sciences The University of Tulsa Oklahoma

We explore the distributed file and task placement problem, which is intractable. We also discuss genetic algorithms and how they have been used successfully to solve combinatorial problems. Our experimental results show the GA to be far superior to the greedy heuristic in obtaining optimal and near optimal file and task placements for the problem with various data sets.< >

关键词： Genetic algorithms Costs Communication networks Network topology Intelligent networks Maintenance Control systems comput.r security Delay Communication system control

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A framework for the graphical specification and execution of complex signal processing applications

A framework for the graphical specification and execution of...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： A. Sicheneder A. Bender E. Fuchs R. Mandl B. Sick Fac. for Math. & Comput. Sci. Passau Univ. Germany Faculty for Mathematics and Computer Science University of Passau Passau Germany

A framework with a tool-supported high-level specification technique is very important for the development of complex signal processing applications containing software-intensive parts (e.g. hybrid systems in automated production processes) in order to provide safe and reliable systems. In this paper we present the concept of a framework, which is an object-oriented CASE-tool offering a graphical specification ability to model and validate a given application and to control its execution. A variety of people having different programming skills is able to use this visual specification technique effectively. Especially users not being interested in implementation details can specify their application on a high abstraction level by connecting reusable and reliable components (modules representing basic algorithms). As a result, complex signal graphs representing the dataflow between the modules are created. The tool supports this software specification technique by automatic type checking for the connections between modules and by changeable module parameters. On the other hand it is easy for software engineers to integrate additional signal processing algorithms into the framework thus building suitable module libraries without considering a specific high-level application.

关键词： Application software Signal processing algorithms Signal processing Production systems Object oriented modeling Automatic control Joining processes Software tools Reliability engineering Software libraries

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