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Special issue on parallel architectures and bioinspired algorithm: guest editors message

CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2013年第8期25卷 1013-1014页

作者： Ignacio Hidalgo, J. Fernandez-de-Vega, Francisco UCM Parallel Architectures & Bioinspired Algortithms Madrid Spain Univ Extremadura Artificial Evolut Grp Merida Spain

This special issue includes the extended version of selected papers presented at the fourth parallel Architectures and Bioinspired Algorithms Workshop held in Galveston Island (TX, USA) on October 14, 2011 in conjunction with parallel Architectures and Compilation Techniques (PACT). This workshop follows the success of the three previous workshops held in conjunction with PACT 2008 in Toronto, Canada [1], PACT 2009 in Raleigh, USA [2], and PACT 2010 in Vienna [3], Austria and the two previous Workshops on parallel Bioinspired Algorithms [4] held in Oslo, 2005, (together with IEEE international conference on parallel Processing (ICPP)) [5] and London, 2007 (together with Association for computing Machinery (ACM) Genetic and Evolutionary Computation conference (Gecco) 2007) [6]. These series of workshops has shown that knowledge fields such as parallel computer architectures and parallel and distributed computing and Bioinspired Algorithms, which could seem quite different in a first approach, are able to find transversal elements that enrich them.

关键词： Computer Architecture parallel architectures Editors distributed computing algorithms Workshops CONJUNCTION parallel Lines workshops international conference AT-Rich Interactive Domain-Containing Protein 1A

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DRAS: Fast dynamic rescheduling scheme eliminating redundant computation

DRAS: Fast dynamic rescheduling scheme eliminating redundant...

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12th IASTED international conference on parallel and distributed computing and networks, pdcn 2014

作者： Matsumoto, Masaki Ohno, Kazuhiko Suzuki, Kohei Sasaki, Takahiro Kondo, Toshio Department of Information Engineering Mie University 1577 Kurimamachiya-cho Tsu Mie 514-8507 Japan

Task scheduling is very important for efficient execution of large-scale workflows. Static scheduling schemes achieve high performance when executing workflows in stable environments. However, the scheduling costs are very high for large-scale workflows and they may perform poorly if the system performance is changed dynamically. Dynamic rescheduling schemes support the dynamic performance changes because tasks are rescheduled using algorithms from static scheduling schemes when the performance is changed. Thus, better performance can be achieved in workflow applications, although the scheduling costs will increase if the system performance is frequently changed. Therefore, we propose a dynamic recursive adaptive scheduling scheme (DRAS) which can reduces the computational cost. DRAS uses RAS, which is a static scheme with low cost, as rescheduling algorithm. However, if DRAS uses RAS algorithm with no change, the cost increases since RAS is called many times. Thus, we improved the RAS to eliminate the redundant computation. Furthermore, we modified RAS to improve the makespan when used for the rescheduling since DRAS may perform poorly in that case. The evaluation using an abstract simulation shows the makespan of DRAS decreases by 30%compared with a dynamic rescheduling scheme which uses the conventional RAS algorithm. Moreover, DRAS considerably reduces the scheduling time, achieving approximately 6 times speedup for workflows consisting of 1,000 tasks when the dynamic performance is frequently changed.

关键词： Grid computing

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A new load balancing algorithm in parallel computing

A new load balancing algorithm in parallel computing

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2nd international conference on Communication Software and networks, ICCSN 2010

作者： Zamanifar, Kamran Nematbakhsh, Naser Sadjady, Razieh Sadat Department of Computer Engineering Islamic Azad University Najafabad Branch Isfahan Iran

ISBN: (纸本)9780769539614

Due to the outstanding progress in computer technology and an ever-rising demand for high-speed processing able to support the distributed mode there is an increasing trend towards the use of parallel and distributed systems. In addition, one of the important stages of any system utilizing parallel computing is the load balancing stage in which the balance of workload among all of the system's processors is aimed. In this article, load balancing in parallel systems is studied then;a new load balancing algorithm which has new capabilities will be introduced. Among the new capabilities of this algorithm, its independence of a separate route-finder algorithm between the load receiver and sender nodes can be mentioned. Finally the results of the simulation of this algorithm will be presented. © 2010 IEEE.

关键词： parallel processing systems

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A cache-aware thread scheduling policy for multi-core processors

A cache-aware thread scheduling policy for multi-core proces...

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IASTED international conference on parallel and distributed computing and networks, pdcn 2009

作者： Sato, Masayuki Kotera, Isao Egawa, Ryusuke Takizawa, Hiroyuki Kobayashi, Hiroaki Graduate School of Information Sciences Tohoku University Aramaki-Aza-Aoba Aoba-ku Sendai 980-8578 Japan Cyberscience Center Tohoku University Aramaki-Aza-Aoba Aoba-ku Sendai 980-8578 Japan

ISBN: (纸本)9780889867840

A modern high-performance multi-core processor has large shared cache memories. However, simultaneously running threads do not always require the entire capacities of the shared caches. Besides, some threads cause severe performance degradation by inter-thread cache conflicts and shortage of capacity on the shared cache. To achieve high performance processing on multi-core processors, effective usage of shared cache memories plays important role. In this paper, we propose a cache-aware thread scheduling policy for multi-core processors with multiple shared cache memories. The total processor performance becomes more sensitive to the cache capacity shortage, as larger caches are requested by the threads sharing one cache. The proposed policy can prevent multiple threads requesting a large cache capacity from sharing one cache. As a result, the policy can prevent inter-thread resource conflicts and hence severe performance degradation. Experimental results clearly demonstrate that the policy assists the cache partitioning mechanisms and avoids unfair performance degradation among threads. Thread scheduling based on the proposed policy can improve the performance by up to 10% and an average of 5% compared with thread scheduling without the proposed policy.

关键词： parallel processing systems

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Proceedings of the 1st international conference on Networking and distributed computing, ICNDC 2010

Proceedings of the 1st International Conference on Networkin...

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1st international conference on Networking and distributed computing, ICNDC 2010

ISBN: (纸本)9780769542072

The proceedings contain 81 papers. The topics discussed include: research and implementation of distributed simulation and parallel rendering system based on grid;the study of the distributed transaction in the service bearer network;an innovation of Chinese input based on android multimedia mobile device;parallel file system-supported server virtual environment in data center;a cluster-based parallel geometric correction algorithm for photogrammetry;new method for weighted coverage optimization of occlusion-free surveillance in wireless multimedia sensor network;the hierarchical threat model of routing security for wireless ad hoc networks;a distributed location based service framework of ubiquitous computing;evenness evaluation in ad-hoc sensor networks;research and application of pressure sensitive fingerprint acquisition system;and regression model in selecting network information technology companies and analyzing their business development trends.

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A distributed workflow mapping algorithm for minimum end-to-end delay under fault-tolerance constraint

A distributed workflow mapping algorithm for minimum end-to-...

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16th IEEE international conference on parallel and distributed Systems, ICPADS 2010

作者： Wu, Qishi Gu, Yi Department of Computer Science University of Memphis Memphis TN 38152 United States

ISBN: (纸本)9780769543079

Many large-scale scientific applications feature distributed computing workflows of complex structures that must be executed and transferred in shared wide-area networks consisting of unreliable nodes and links. Mapping these computing workflows in such faulty network environments for optimal latency while ensuring certain fault tolerance is crucial to the success of eScience that requires both performance and reliability. We construct analytical cost models and formulate workflow mapping as an optimization problem under failure rate constraint. We propose a distributed heuristic mapping solution based on recursive critical path to achieve minimum end-to-end delay and satisfy a pre-specified overall failure rate for a guaranteed level of fault tolerance. The performance superiority of the proposed mapping solution is illustrated by extensive simulation-based comparisons with existing mapping algorithms. © 2010 IEEE.

关键词： Fault tolerance

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An efficient key management scheme for mobile agents in distributed networks

An efficient key management scheme for mobile agents in dist...

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2010 1st international conference on parallel, distributed and Grid computing, PDGC - 2010

作者： Nikooghadam, Morteza Safaei, Farshad Zakerolhosseini, Ali Faculty of ECE Shahid Beheshti University G.C. Evin *** Tehran Iran

ISBN: (纸本)9781424476725

In recent years, the Elliptic Curve Cryptosystem (ECC) has attracted a great deal of attention due to its advantages. In this paper, a new ECC based scheme in a hierarchical mobile agent framework is presented. In the proposed scheme legality of agents is verified by hosts to avoid the masquerade attack. Analyzing the security criteria and performance reports the suitability of the proposed scheme for mobile agent environments. © 2010 IEEE.

关键词： Mobile agents

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distributed Gateway Placement for Cost Minimization in Wireless Mesh networks

Distributed Gateway Placement for Cost Minimization in Wirel...

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international conference on distributed computing Systems (ICDCS 2010)

作者： Xu, XiaoHua Tang, ShaoJie Mao, Xufei Li, Xiang-Yang IIT Dept Comp Sci Chicago IL 60616 USA

ISBN: (纸本)9780769540597

We study the problem of gateway placement for cost minimization (GPCM) in two-dimensional wireless mesh networks. We are given a set of mesh routers, assume they have identical transmission range r, represented by unit transmission disks around them. A router may be selected as a gateway at certain placing cost. A router is served by a gateway if and only if the gateway is within its transmission range. The goal of this work is to select a set of mesh routers as gateways to serve the rest routers with minimum overall cost. This problem is NP-hard. To the best of our knowledge, no distributed algorithm with a constant approximation ratio has been given before. When all weights are uniform, the best approximation ratio is 38. We present both centralized and distributed algorithms which can achieve approximation ratios 6 + epsilon and 20 respectively. Our algorithms greatly improve the best approximation ratios.

关键词： Routers

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Stopping communication of malicious nodes in MANETs using authorized tokens

Stopping communication of malicious nodes in MANETs using au...

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2010 1st international conference on parallel, distributed and Grid computing, PDGC - 2010

作者： Chandrakant, N. Joshi, Swati P. Shenoy, P. Deepa Venugopal, K.R. Patnaik, L.M. Department of Computer Science and Engineering University Visvesvaraya College of Engineering Bangalore University India Defence Institute of Advanced Technology India

ISBN: (纸本)9781424476725

A rapid increase of wireless networks and mobile computing applications has changed the landscape of network security. A MANET is more susceptible to the attacks than wired network. As a result, attacks with malicious intent have been and will be devised to take advantage of these vulnerabilities and to cripple the MANET operation. Hence we need to search for new architecture and mechanisms to protect the wireless networks and mobile computing applications. In this paper, we examine the nodes that come under the vicinity of base node and members of the network and communication is provided to genuine nodes only. It is found that the proposed algorithm is a effective algorithm for security in MANETs. © 2010 IEEE.

关键词： Mobile computing

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A general distributed object locating architecture in the Internet of Things

A general distributed object locating architecture in the In...

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16th IEEE international conference on parallel and distributed Systems, ICPADS 2010

作者： Liu, Wenmao Yin, Lihua Zhang, Weizhe Zhang, Hongli Harbin Institute of Technology Harbin School of Computer Science and Technology Heilongjiang 150001 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

ISBN: (纸本)9780769543079

This paper proposes a novel platform for object locating application in the Internet of Things environment. In this platform, objects and inquirers access and query locations using uniform service entry interfaces in heterogeneous services. To build a virtual storage system, services entries integrate enterprise database clusters and a DHT peer-to-peer network built with inquirers' devices. The DHT network is originally designed for accurate object locating, to enable fuzzy object locating we construct a hierarchical storage overlay network based on the DHT network. This LBS platform simplifies the object locating operation for ordinary inquirers greatly, moreover it provides huge virtual computing and storage resources for small companies and individual developers. © 2010 IEEE.

关键词： Peer to peer networks

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