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An Extended Model for Active Rule Condition Evaluation of Spatial Database

An Extended Model for Active Rule Condition Evaluation of Sp...

引用

ACIS international Conference on software engineering, Artificial Intelligence, Networking, and parallel/distributed Computing (SNPD)

作者： Wei Xiong Ning Jing Hong-sheng Chen Luo Chen School of Electronics Science and Engineering National University of Defense Technology Changsha China

With more and more applications of spatial data, a great demand on business rules related to spatial information emerges. Active rule integrated into spatial database can be used to implement not only integrity constraint but also various business rules. Condition matching for active rule is critical to the efficiency of rules execution. However the active rule of spatial database is quite different from that of relational database, so the existing models cannot be directly introduced into spatial database to gain the same efficiency. In this paper, traditional condition evaluation model, rule discrimination network (RDN) is improved. Combined algebra optimization of spatial query with spatial operator migration, we propose an extended spatial rule discrimination network (ESRDN) as an efficient condition evaluation model for active rule of spatial database. Some heuristic optimization rules of ESRDN are presented and proved. At last a cost model is presented to assess the efficiency of the model we proposed, and experiment is used to illustrate the optimized results of ESRDN.

关键词： Spatial databases Relational databases Algebra Cost function Geographic Information systems Optimization methods software engineering Artificial intelligence Deductive databases Intelligent networks

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Dependable QoS support in Mesh Networks

Dependable QoS support in Mesh Networks

引用

international symposium on parallel and distributed Processing (IPDPS)

作者： M. Fazio M. Paone D. Bruneo A. Puliafito Faculty of Engineering University of Messina Messina Italy

Wireless networks are a very challenging communication technology since their ability to be set everywhere and whenever. Among the several types of wireless systems, a new class of networks is gradually emerging: Wireless Mesh Networks (WMNs). A WMN is a distributed communication infrastructure organized in a mesh topology, which handles multi-hops connections and is capable of provide dependable services by dynamically updating and optimizing communications. This paper presents a new cross-layer architecture for supporting QoS in WMNs. It integrates the DiffServ paradigm with the admission control signaling and a multipath routing to route QoS traffic along reserved paths, while making use of alternative paths for Best Effort load. Performance measurements, based on simulative techniques are carried out to test the reliability of the proposed system.

关键词： Mesh networks Wireless mesh networks Communications technology Network topology Spread spectrum communication Diffserv networks Admission control Routing Communication system traffic control Traffic control

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Smart read/write for MPI-IO

Smart read/write for MPI-IO

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international symposium on parallel and distributed Processing (IPDPS)

作者： Saba Sehrish Jun Wang School of Electrical Engineering and Computer Science University of Central Florida USA

We present a case for automating the selection of MPI-IO performance optimizations, with an ultimate goal to relieve the application programmer from these details, thereby improving their productivity. Programmers productivity has always been overlooked as compared to the performance optimizations in high performance computing community. In this paper we present RFSA, a reduced function set abstraction based on an existing parallel programming interface (MPI-IO) for I/O. MPI-IO provides high performance I/O function calls to the scientists/engineers writing parallel programs; who are required to use the most appropriate optimization of a specific function, hence limits the programmer productivity. Therefore, we propose a set of reduced functions with an automatic selection algorithm to decide what specific MPI-IO function to use. We implement a selection algorithm for I/O functions like read, write, etc. RFSA replaces 6 different flavors of read and write functions by one read and write function. By running different parallel I/O benchmarks on both medium-scale clusters and NERSC supercomputers, we show that RFSA functions impose minimal performance penalties.

关键词： Programming profession Productivity parallel programming Clustering algorithms Optimization Supercomputers Computer science Application software High performance computing Writing

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CCQR: Constant Cost Quality-based Routing Protocol in Delay Tolerant Networks

CCQR: Constant Cost Quality-based Routing Protocol in Delay ...

引用

international Conference on parallel and distributed systems (ICPADS)

作者： Tao Li Chao Dong Guihai Chen State Key Laboratory of Novel Software Technology Nanjing University Nanjing Jiangsu China Institute of Communication Engineering of PLAUST Nanjing Jiangsu China

Quality-based routing protocols are proposed to restrict message flooding within only high quality nodes in delay tolerant networks (DTNs). However, different quality threshold mechanisms have diverse impact on the network and we investigate this issue in the paper. Through theoretical analysis we show that heterogeneous threshold mechanism suffers a severe nodal cost imbalance problem. Furthermore, for both homogeneous and heterogeneous mechanisms, routing cost depends on the total number of nodes, and becomes significant in large-scale networks. To address these issues, we propose Constant Cost Quality-based Routing (CCQR) protocol, which not only retains the favorable features of quality-based routing protocols, but also achieves a constant routing cost. More importantly, thanks to the wise message distribution rules, CCQR protocol is capable of alleviating nodal cost imbalance problem effectively. We also conduct extensive simulations to verify our conclusions and the efficacy of the new protocol.

关键词： Costs Routing protocols Disruption tolerant networking Floods Chaotic communication Laboratories Communication system software software quality Large-scale systems Wireless networks

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Using Pcache to Speedup Interpretation in Dynamic Binary Translation

Using Pcache to Speedup Interpretation in Dynamic Binary Tra...

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international symposium on parallel and distributed Processing with Applications, ISPA

作者： Wei Chen Hongyi Lu Li Shen Zhiying Wang Nong Xiao School of Computer National University of Defense Technology Changsha Hunan China

Abstract- Dynamic binary translation (DBT) converts codes written for a source instruction set architecture (ISA) into optimized code for a target ISA. DBT has emerged as an important tool with real world applications. Interpretation is always adopted to handle the non hotspot code in a two stage DBT system. An important consideration in such DBT systems is the interpretation overhead. We investigate that repeated redecoding operations are the bottleneck of interpretation overhead. We propose interpreted code cache (Pcache), a hardware assist to save the information of the decoded instruction for reuse. We analyze and model Pcache performance via simulation on a DBT system simulator. Results from SPEC2000 integer benchmarks show that Pcache could significantly reduce redecoding operations and the overhead of interpretation in a DBT system. The speedup of interpretation is up to 17.12 on average with assist of Pcache. We also analyze the extra overhead caused by Pcache, which is neglectable compared to the performance gains.

关键词： Instruction sets Decoding Application software Hardware Analytical models Performance analysis Performance gain Cost function Emulation distributed processing

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An integrated approach to improving the parallel application development process

An integrated approach to improving the parallel application...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Gregory R. Watson Craig E. Rasmussen Beth R. Tibbitts IBM Thomas J. Watson Research Center USA Los Alamos National Laboratory USA

The development of parallel applications is becoming increasingly important to a broad range of industries. Traditionally, parallel programming was a niche area that was primarily exploited by scientists trying to model extremely complicated physical phenomenon. It is becoming increasingly clear, however, that continued hardware performance improvements through clock scaling and feature-size reduction are simply not going to be achievable for much longer. The hardware vendor's approach to addressing this issue is to employ parallelism through multi-processor and multi-core technologies. While there is little doubt that this approach produces scaling improvements, there are still many significant hurdles to be overcome before parallelism can be employed as a general replacement to more traditional programming techniques. The parallel tools platform (PTP) project was created in 2005 in an attempt to provide developers with new tools aimed at addressing some of the parallel development issues. Since then, the introduction of a new generation of peta-scale and multi-core systems has highlighted the need for such a platform. In this paper, we describe some of the challenges facing parallel application developers, present the current state of PTP, and provide a simple case study that demonstrates how PTP can be used to locate a potential deadlock situation in an MPI code.

关键词： parallel programming parallel processing Performance analysis Debugging Hardware Programming profession Application software System recovery Concurrent computing Electronics packaging

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Combating side-channel attacks using key management

Combating side-channel attacks using key management

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international symposium on parallel and distributed Processing (IPDPS)

作者： Donggang Liu Qi Dong ISec Laboratory Department of Computer Science and Engineering University of Texas Arlington USA

Embedded devices are widely used in military and civilian operations. They are often unattended, publicly accessible, and thus vulnerable to physical capture. Tamper-resistant modules are popular for protecting sensitive data such as cryptographic keys in these devices. However, recent studies have shown that adversaries can effectively extract the sensitive data from tamper-resistant modules by launching semi-invasive side-channel attacks such as power analysis and laser scanning. This paper proposes an effective key management scheme to harden embedded devices against side-channel attacks. This technique leverages the bandwidth limitation of side channels and employs an effective updating mechanism to prevent the keying materials from being exposed. This technique forces attackers to launch much more expensive and invasive attacks to tamper embedded devices and also has the potential of defeating unknown semi-invasive side-channel attacks.

关键词： Hardware Data mining Wireless sensor networks Information security Laboratories Protection Power lasers Optical materials Sensor systems Control systems

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Multithreading-Enabled Active Replication for Event Stream Processing Operators

Multithreading-Enabled Active Replication for Event Stream P...

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Reliable distributed systems

作者： Andrey Brito Christof Fetzer Pascal Felber Systems Engineering Group Technische Universität Dresden Dresden Germany Institut d'informatique University of Neuchâtel Neuchatel Switzerland

Event stream processing (ESP) systems are very popular in monitoring applications. Algorithmic trading, network monitoring and sensor networks are good examples of applications that rely upon ESP systems. As these systems become larger and more widely deployed, they have to answer increasingly stronger requirements that are often difficult to satisfy. Fault-tolerance is a good example of such a non-trivial requirement. Making ESP operators fault-tolerant can add considerable performance overhead to the application. In this paper, we focus on active replication as an approach to provide fault-tolerance to ESP operators. More precisely, we address the performance costs of active replication for operators in distributed ESP *** use a speculation mechanism based on software transactional memory (STM) to achieve the following goals: (i) enable replicas to make progress using optimistic delivery; (ii) enable early forwarding of speculative computation results; (iii) enable active replication of multi-threaded operators using transactional executions. Experimental evaluation shows that, using this combination of mechanisms, one can implement highly efficient fault-tolerant ESP operators.

关键词： Electrostatic precipitators Fault tolerance Monitoring Delay Application software Costs Broadcasting Reliability engineering systems engineering and theory Sensor systems and applications

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Efficient scheduling of task graph collections on heterogeneous resources

Efficient scheduling of task graph collections on heterogene...

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international symposium on parallel and distributed Processing (IPDPS)

作者： Matthieu Gallet Loris Marchal Frederic Vivien Université de Lyon France LIP laboratory UMR ENS Lyon-CNRS-INRIA-UCBL Lyon France INRIA France

In this paper, we focus on scheduling jobs on computing grids. In our model, a grid job is made of a large collection of input data sets, which must all be processed by the same task graph or workflow, thus resulting in a collection of task graphs problem. We are looking for a competitive scheduling algorithm not requiring complex control. We thus only consider single-allocation strategies. In addition to a mixed linear programming approach to find an optimal allocation, we present different heuristic schemes. Then, using simulations, we compare the performance of our different heuristics to the performance of a classical scheduling policy in Grids, HEFT. The results show that some of our static-scheduling policies take advantage of their platform and application knowledge and outperform HEFT, especially under communication-intensive scenarios. In particular, one of our heuristics, DELEGATE, almost always achieves the best performance while having lower running times than HEFT.

关键词： Processor scheduling Grid computing Scheduling algorithm distributed computing Application software Laboratories Linear programming Steady-state Large-scale systems Physics

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How to build programmable multi-core chips

How to build programmable multi-core chips

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IEEE symposium on High-Performance Computer Architecture

作者： Jack Dennis Electrical Engineering MIT-CSAIL USA

The arrival of multi-core chips has heightened interest in the discipline of parallel programming, a topic that has received much attention for many years. Computer architects have much to learn from sound principles for structuring software and expressing parallel computation. This talk will cover principles for the design of computer systems to support composable parallel software - the idea that any parallel program is usable, without change, as a component of larger parallel programs. By following these principles, a revolution in the ease of building robust and high-performance parallel software can be achieved. The principles suggest interesting directions for computer architecture; the tools to experiment with new architecture concepts are ready and waiting for the savvy and ambitious researcher.

关键词： Computer architecture Mathematical programming Concurrent computing Lifting equipment Computer languages parallel programming Buildings Robustness Writing Quadratic programming

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