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Design and evaluation of an intelligent peer-to-peer distributed file system

Design and evaluation of an intelligent peer-to-peer distrib...

引用

Proceedings of the international conference on parallel and distributed processing techniques and applications, PDPTA'04

作者： Gradecki, Joseph D. Ra, Ilkyeun Dept. of Comp. Sci. and Engineering University of Colorado Denver

ISBN: (纸本)1932415262

In order to support very high capability storage systems, a peer-to-peer distributed file system architecture has been developed along with a prototype implementation. Current systems may have difficulty providing virtual data storage services because they typically only depend on trusted nodes in a local network. To support utilization of nodes beyond a local network, trusted nodes across the Internet need to be used with characteristics along the lines of scalability, availability and becoming profitable if the services are available to paid customers. In this paper we present a novel adaptive rule-based peer-to-peer distributed file system which is able to build a trusted distributed file system environment and enables users to securely store and retrieve their files at either trusted storage nodes or untrusted nodes that are located across the network. We further present some interesting results obtained when a rouge node is presented to the system.

关键词： File editors

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Dynamic Load Balancing and Channel Strategy for Apache Flume Collecting Real-time Data Stream 15

Dynamic Load Balancing and Channel Strategy for Apache Flume...

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15th IEEE international Symposium on parallel and distributed processing with applications (ISPA) / 16th IEEE international conference on Ubiquitous Computing and Communications (IUCC)

作者： Shu, Buqing Chen, Haopeng Sun, Meng Shanghai Jiao Tong Univ Sch Software Shanghai Peoples R China

ISBN: (纸本)9781538637906

With the development of information technology, real-time data stream processing(RTDSP) has become a popular research topic. The first step of RTDSP is collecting data, requiring a data collector to receive data from the source and send them to the sink. Apache Flume, a distributed and reliable framework, used for this purpose, has some limitations and drawbacks on load balancing and storage. In this paper, we aim to improve performance and availability for collecting unstable real-time big data stream. So we propose a new load balancing strategy based on the free memory size and a storage strategy of integration memory channel with the multi-file channel to reduce the overhead of disk and network. Finally, the experimental results show that the availability and performance are improved under the condition of a poor network, high availability requirements, intense competition in memory resources and large data size. Specifically, the availability is higher than 99.999%, and the performance can be improved by 10%-50% under different conditions.

关键词： Load management Real-time systems distributed databases Throughput Monitoring Dynamic scheduling Memory management

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parallel acoustic wave simulation in two dimensions for mediums of varying density

Parallel acoustic wave simulation in two dimensions for medi...

引用

Proceedings of the international conference on parallel and distributed processing techniques and applications

作者： Armstrong-Crews, Nicholas L. University of Alaska Anchorage Anchorage AK United States

ISBN: (纸本)1892512416

Waves are everywhere;countless natural phenomena are composed of waves or interact with waves in some way. Light, sound, earthquakes, oceanic waves - all are examples of waves. Since waves are so ubiquitous, it is of great importance for scientists and engineers to study and model them. For example, a seismologist might want to model an earthquake's Shockwave. The wave simulator described in this document is designed to simulate such a situation, i.e., the propagation of an acoustic wave through a medium of varying density. It models the wave's propagation in two dimensions, using a finite difference method and absorbing boundary conditions. In order to accommodate large sets of data over many time iterations and to model such data in a tractable amount of time, the simulator is parallelized using MPI. The output is displayed visually as an animation over a three-dimensional surface, in which the z-axis represents the density of the medium;the wave can be seen as a displacement in density over the medium.

关键词： parallel processing systems

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A formal model for dynamic channel allocation as a mutual exclusion concept in a distributed mobile computing system

A formal model for dynamic channel allocation as a mutual ex...

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Proceedings of the international conference on parallel and distributed processing techniques and applications

作者： Udgata, S.K. Van Hung, Dang P.G. Dept. of Computer Science Berhampur University Berhampur Orissa India UNU/IIST Macau SARL China

ISBN: (纸本)1892512416

The wireless channels are most important resources in a mobile computing system. Each communication session that involves a mobile host requires a channel to be allocated. The possibility of reuse of wireless channels in different cells subject to satisfying the reuse constraint is the main concern for optimizing the channel usage in the mobile computing system. The problem resembles with mutual exclusion problem with some additional constraints that the same resources can be reused beyond the cell's interference region. We present a formal model for channel allocation problem in a distributed mobile computing system using Duration Calculus (DC) as a special mutual exclusion concept. We propose a new distributed dynamic channel allocation algorithm based on the formal model. The proposed algorithm attempts to bring the best features of the permission-based and token-based principles of mutual exclusion.

关键词： distributed computer systems

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A distributed QoS network scheduler

A distributed QoS network scheduler

引用

Proceedings of the international conference on parallel and distributed processing techniques and applications, PDPTA'04

作者： Ramanujam, Sriram Theys, Mitchell D. Department of Computer Science University of Illinois at Chicago MC 152 851 S. Morgan St. Chicago IL 60607

ISBN: (纸本)1932415262

The distributed QoS Network Scheduler (DQNS) is used to schedule paths over a mobile, IP or optical network. The scheduler is intelligent enough to adapt to the ever-changing network conditions and aims to serve the path requests based on a cost equation. DQNS is more than a scheduler as it does QoS routing and resource allocation in addition to the scheduling. Being a generic framework, DQNS gives the flexibility to replace the components and hence can be fine-tuned to match the network behavior. It is a distributed entity, which does the scheduling based on the information collected from various scheduling agents. Each scheduling agent obtains QoS information from a local QoS monitor. DQNS employs crawler objects to scan the scheduling agents and retrieve QoS information for a specified path. This information is used to provide QoS guarantees to clients requesting for a path with specific QoS requirements.

关键词： distributed computer systems

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Generalized Extraction of Real-Time Parameters for Homogeneous Synchronous Dataflow Graphs 23

Generalized Extraction of Real-Time Parameters for Homogeneo...

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23rd Euromicro international conference on parallel, distributed, and Network-Based processing (PDP)

作者： Ali, Hazem Ismail Akesson, Benny Pinho, Luis Miguel Polytech Inst Porto CISTER Res Ctr INESC TEC Oporto Portugal Czech Tech Univ Prague Czech Republic

ISBN: (纸本)9781479984909

Many embedded multi-core systems incorporate both dataflow applications with timing constraints and traditional real-time applications. Applying real-time scheduling techniques on such systems provides real-time guarantees that all running applications will execute safely without violating their deadlines. However, to apply traditional real-time scheduling techniques on such mixed systems, a unified model to represent both types of applications running on the system is required. Several earlier works have addressed this problem and solutions have been proposed that address acyclic graphs, implicit-deadline models or are able to extract timing parameters considering specific scheduling algorithms. In this paper, we present an algorithm for extracting real-time parameters (offsets, deadlines and periods) that are independent of the schedulability analysis, other applications running in the system, and the specific platform. The proposed algorithm: 1) enables applying traditional real-time schedulers and analysis techniques on cyclic or acyclic Homogeneous Synchronous Dataflow (HSDF) applications with periodic sources, 2) captures overlapping iterations, which is a main characteristic of the execution of dataflow applications, 3) provides a method to assign offsets and individual deadlines for HSDF actors, and 4) is compatible with widely used deadline assignment techniques, such as NORM and PURE. The paper proves the correctness of the proposed algorithm through formal proofs and examples.

关键词： Multi- and Many-Core Systems Real-Time Systems Homogeneous Synchronous Dataflow (HSDF) Hard Real-Time Streaming Dataflow applications Algorithms Cyclic Graphs

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Engineering CORBA-based systems for high performance

Engineering CORBA-based systems for high performance

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31st international conference on parallel processing (ICPP 2002)

作者： Wu, WK Majumdar, S Carleton Univ Dept Syst & Comp Engn Ottawa ON K1S 5B6 Canada

ISBN: (纸本)0769516777

Inter-operability in heterogeneous distributed systems is often provided with the help of CORBA compliant middleware. Many distributed Object Computing Systems, however, are characterized by limited heterogeneity. Such systems often contain a subset of components that are written in the same programming language and run on top of the same platform. We present engineering techniques that exploit such limited heterogeneity in systems for achieving high system performance. With these techniques components implemented using diverse programming languages and/or platform use a CORBA compliant middleware, whereas the similar components can use a "Flyover" that employs a separate path between the client and its server and avoids a number of CORBA overheads. Insights into system behavior and performance gained from results of experiments with synthetic workload running on a network of PC's are presented.

关键词： Application software Computer languages distributed computing Embedded system Middleware Network servers Operating systems Scalability System performance Systems engineering and theory

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Flex: Flexible and Energy Efficient Scheduling for Big Data Storage 44

Flex: Flexible and Energy Efficient Scheduling for Big Data ...

引用

44th Annual international conference on parallel processing Workshops (ICPPW)

作者： Ma, Daokuan Wu, Yongwei Chen, Kang Zheng, Weimin Tsinghua Univ Dept Comp Sci & Technol Beijing 100084 Peoples R China

ISBN: (纸本)9781467375894

Traditional distributed schedulers only consider the scheduling of jobs and treat the storage system as static and already deployed. However, individual application often needs its own configuration of storage system. Therefore, traditional distributed schedulers are not able to serve multiple tenants. To improve the resource utilization, some mechanisms are needed to consolidate multiple applications running on top of the same computing resources. Flex is such a system for helping the distributed scheduler to deploy a customized storage system before a job is scheduled without too much overhead incurred. The lightweight operating system level virtualization technology, aka containers in Linux, is used to wrap the computing environment and isolate different applications. Flex can achieve two goals that traditional distributed scheduler cannot provide. One is to deploy a specific storage system for the requirement of an individual application;the other is to consolidate applications for a better use of the underlying computing resources. Thus, by employing storage scheduling, Flex improves the resource utilization of distributed systems.

关键词： Containers Flexible printed circuits Hardware High performance computing Operating systems Virtual machining Virtualization Big Data distributed Scheduler distributed System Linux Container Cache Memory System big data distributed Systems virtual machines Operating systems High Performance Computing Virtualization CONTAINERS Computer hardware Flexibility Resource utilization Flexible printed circuits virtual machining jobs

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One-to-many parallel routing algorithm on recursive circulant networks employing the hungarian method

One-to-many parallel routing algorithm on recursive circulan...

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2008 international conference on parallel and distributed processing techniques and applications, PDPTA 2008

作者： Choi, Dongmin Cho, Miyoung Bae, Yongkeun Chung, Ilyong Department of Computer Science Chosun University Gwangju Korea Republic of

ISBN: (纸本)1601320841

The recursive circulant network(RCN) can be widely used in the design and implementation of parallel processing architectures. In this paper, we investigate the routing of a message on RCN, that is a key to the performance of RCN. On a recursive circulant network we would like to transmit m packets from a source node to m destination node simultaneously along paths on this network, the ith packet will traverse along the ith path (0 ≤ i ≤ m - 1). In order for all packets to arrive at a destination node quickly and securely, we construct a set of m node-disjoint paths each being shortest or near shortest and the total length is minimum. To accomplish this, we present O(m3) one-to-many parallel routing algorithm on RCN employing the Hungarian method.

关键词： Routing algorithms

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techniques for designing efficient parallel graph algorithms for SMPs and multicore processors

引用

5th international Symposium on parallel and distributed processing and applications/ISPA 2007 international Workshops

作者： Cong, Guojing Bader, David A. IBM Corp Thomas J Watson Res Ctr Yorktown Hts NY 10598 USA Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)9783540747413

Graph problems are finding increasing applications in high performance computing disciplines. Although many regular problems can be solved efficiently in parallel, obtaining efficient implementations for irregular graph problems remains a challenge. We propose techniques for designing and implementing efficient parallel algorithms for graph problems on symmetric multiprocessors and chip multiprocessors with a case study of parallel tree and connectivity algorithms. The problems we study represent a wide range of irregular problems that have fast theoretic parallel algorithms but no known efficient parallel implementations that achieve speedup without serious restricting assumptions about the inputs. We believe our techniques will be of practical impact in solving large-scale graph problems.

关键词： spanning tree minimum spanning tree biconnected components shared memory

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