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A Hierarchical Memory Service Mechanism in Server Consolidation Environment

A Hierarchical Memory Service Mechanism in Server Consolidat...

引用

international conference on parallel and distributed systems (ICPADS)

作者： Liufeng Wang Huaimin Wang Lu Cai Rui Chu Pengfei Zhang Lanzheng Liu National Key Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha China School of Economics and Management Xi'an University Xi'an China

Increasing Internet business and computing footprint motivate server consolidation in data centers. through virtualization technology, server consolidation can reduce physical hosts and provide scalable services. However, the ineffective memory usage among multiple virtual machines (VMs) becomes the bottleneck in server consolidation environment. Because of inaccurate memory usage estimate and the lack of memory resource managements, there is much service performance degradation in data centers, even though they have occupied a large amount of memory. In order to improve this scenario, we first introduce VM's memory division view and VM's free memory division view. Based on them, we propose a hierarchal memory service mechanism. We have designed and implemented the corresponding memory scheduling algorithm to enhance memory efficiency and achieve service level agreement. the benchmark test results show that our implementation can save 30% physical memory with 1% to 5% performance degradation. Based on Xen virtualization platform and balloon driver technology, our works actually bring dramatic benefits to commercial cloud computing center which is providing more than 2,000 VMs' services to cloud computing users.

关键词： Memory management Resource management Servers Scheduling algorithm Benchmark testing Cloud computing System performance

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VisageFS Translucent Directories: Efficient Posix Consistencies for Wide-Area Workflows

VisageFS Translucent Directories: Efficient Posix Consistenc...

引用

Euromicro conference on parallel, distributed and Network-Based Processing

作者： François thiebolt Aurélien Ortiz Abdelaziz M'zoughi IRIT Institut de Recherche en Informatique de Toulouse Université Paul Sabatier Toulouse France IRIT Institut de Recherche en Informatique de Toulouse Universitç Paul Sabatier Toulouse III Toulouse Cedex France

One of the key challenges related to the grid environment is to efficiently use the storage resources of compute nodes. therefore, we have developed the ViSaGe solution which features VisageFS - a POSIX-compliant wide-area file system, VCCC - a distributed lock mechanism, and VRT - a storage virtualization layer. In this paper, we present the VisageFS translucent directory property which enables a dynamic, transparent and efficient use of local storage by means of hierarchical Posix consistencies. Nodes that access a translucent enabled shared-directory will see different contents according to the site or node-level POSIX consistency. thereafter, one of the various reconciliation modes re-enables the grid-level POSIX consistency. Our " nevermind '' mode does it in constant time .

关键词： File systems Grid computing Computer networks Concurrent computing distributed computing Synchronous generators Telecommunication traffic Protocols Delay Context

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Flexible Linear Algebra Development and Scheduling with Cholesky Factorization

Flexible Linear Algebra Development and Scheduling with Chol...

引用

IEEE international conference on High Performance computing and Communications (HPCC)

作者： Azzam Haidar Asim YarKhan Chongxiao Cao Piotr Luszczek Stanimire Tomov Jack Dongarra University of Tennessee Knoxville USA University of Tennessee USA University of Manchester Knoxville UK

Modern high performance computing environments are composed of networks of compute nodes that often contain a variety of heterogeneous compute resources, such as multicore CPUs and GPUs. One challenge faced by domain scientists ishow to efficiently use all these distributed, heterogeneous resources. Inorder to use the GPUs effectively, the workload parallelism needs to be muchgreater than the parallelism for a multicore-CPU. Additionally, effectivelyusing distributed memory nodes brings out another level of complexity where theworkload must be carefully partitioned over the nodes. In this work we areusing a lightweight runtime environment to handle many of the complexities insuch distributed, heterogeneous systems. the runtime environment usestask-superscalar concepts to enable the developer to write serial code whileproviding parallel execution. the task-programming model allows the developerto write resource-specialization code, so that each resource gets theappropriate sized workload-grain. Our task-programming abstraction enables thedeveloper to write a single algorithm that will execute efficiently across the distributed heterogeneous machine. We demonstrate the effectiveness of ourapproach with performance results for dense linear algebra applications, specifically the Cholesky factorization.

关键词： Multicore processing Runtime Hardware Graphics processing units Scalability Linear algebra parallel processing

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Improving Speculative Execution Performance with Coworker for Cloud computing

Improving Speculative Execution Performance with Coworker fo...

引用

international conference on parallel and distributed systems (ICPADS)

作者： Sheng-Wei Huang Tzu-Chi Huang Syue-Ru Lyu Ce-Kuen Shieh Yi-Sheng Chou Institute of Computer and Communication Engineering Department of Electrical Engineering National Cheng Kung University Taiwan Department of Electronic Engineering Lunghwa University of Science and Technology Taiwan

MapReduce is an important programming model for large-scale parallel applications. It divides a job into several parallel tasks and completes the job by sequential phases, i.e. map phase and reduce phase. the job completion time will be delayed when a task, called straggler, consumes more time than others. the main reason that a straggler occurs is the imbalance resource distribution among computing nodes in the cloud. Speculative execution is a solution for dealing with stragglers. Duplicate tasks are launched on other nodes to process the same data as the straggler does. Any completion of these tasks implies that this task is finished and other duplicate tasks can be aborted. However, aborting tasks misspends resources. In this paper, we propose an idea of using coworkers to help a straggler. According to the processing rate of the straggler and the coworker, the amount of data parceled out from the straggler to the coworker should be determined. Different from speculative execution, coworkers finish tasks with stragglers and do not misspend computing resources. Experimental results show that coworkers can reduce the task completion time by 37% and the network traffic by 64% when comparing with speculative execution.

关键词： Cloud computing Virtual machining Programming Bandwidth Computational modeling Computers Fault tolerance

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Analyzing and Implementing Peer-to-Peer systems with the PeerSE Experiment Environment

Analyzing and Implementing Peer-to-Peer Systems with the Pee...

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Euromicro conference on parallel, distributed and Network-Based Processing

作者： Ludger Bischofs Wilhelm Hasselbring Institute for Information Technology Oldenburg OFFIS e.V. Germany Software Engineering Group University of Kiel Kiel Germany

this paper introduces the PeerSE experiment environment (EE) including concepts for a simulation-based analysis and implementation of P2P systems. the PeerSE EE supports a comparative analysis of P2P system models to identify models fulfilling given requirements. In a next step, model components are reused for implementing laboratory and real-world P2P systems. the integrated visualization for simulation and laboratory experiment results helps developers to compare the behavior of simulation models and laboratory systems. thus, the PeerSE EE allows a controlled transition of model components to laboratory components. the applicability of the PeerSE EE is demonstrated by exemplarily analyzing and implementing a P2P system.

关键词： Peer to peer computing Laboratories Visualization Analytical models Information analysis Discrete event simulation Information technology Software engineering Java Discrete event systems

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Adaptive and Efficient Peer Selection in Peer-to-Peer Streaming Networks

Adaptive and Efficient Peer Selection in Peer-to-Peer Stream...

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international conference on parallel and distributed systems (ICPADS)

作者： Tai-Hua Hsiao Ming-Hung Hsu Yu-Ben Miao Information and Communication Research Laboratory Industrial Technology Research Institute Taiwan

Nowadays Peer-to-Peer technologies for content distribution such as file-sharing and streaming media delivery are quite popular with Internet users. For P2P streaming applications, an appropriate peer selection scheme is critical to reduce startup delay and to provide media delivery of high quality. In this work, we propose a novel peer selection scheme AEPS that is both efficient and adaptive to dynamic P2P network. the AEPS combines the advantages of round-trip time based (RTT-based) schemes and available bandwidth based (ABW-based) schemes, to perform efficient and accurate selection. Experiments under three distinct scenarios are realized to quantitatively compare the AEPS with other selection schemes. the experiment results exhibit that the AEPS is more accurate than RTT-based schemes and more efficient than ABW-based schemes, achieving impressive performance in general.

关键词： Bandwidth Peer to peer computing Estimation Streaming media Servers Equations Delay

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Secure Mechanism for Mobile Web Browsing

Secure Mechanism for Mobile Web Browsing

引用

international conference on parallel and distributed systems (ICPADS)

作者： Chia-Mei Chen Ya-Hui Ou Department of Information Management National Sun Yat-Sen University Kaohsiung Taiwan

the prevailing of mobile network provides increasing web applications and services available on mobile devices. However, most of the websites are developed with limited security consideration, let alone web services for mobile users. Hackers take advantage of the web-based vulnerabilities to inject malicious JavaScript into compromised web pages, and a mobile victim visits the site will be compromised. Current anti-virus software for mobile devices is not adequate to protect mobile users from malicious web pages. Based on our observation, mobile malicious web pages have unusual behaviors for evading detection which makes them different form normal ones. therefore, we propose a client-side malicious web page detection method based on anomaly behaviors observed from web page analysis. Based on the experimental results, our method can identify malicious web page efficiently and warn the website visitors before browsing.

关键词： Mobile communication Mobile handsets Security Web pages Encoding Semantics Mobile computing

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A Study of Video Frame Sharing in Sparse Vehicular Networks

A Study of Video Frame Sharing in Sparse Vehicular Networks

引用

international conference on parallel and distributed systems (ICPADS)

作者： Wen-Cheng Shieh Sok-Ian Sou Shin-Yeh Tsai Institute of Computer and Communication Engineering National Cheng Kung University Tainan Taiwan

Due to the limited budget and high maintenance cost, it is difficult to deploy a large amount of roadside units (such as 802.11 base stations) to cover all road sections. through a sparse network infrastructure, vehicles experience long download delay for large-size videos. In this paper, we proposed a Video Frame Sharing Mechanism (VFSM) to improve the performance of download sessions. We also investigate how to prevent selfish nodes in VFSM. through VFSM, users can download video frames from RSUs (Road Side Units) or share video frames with neighboring vehicles by V2V communications in a fair manner. As a result, the video downloading can be speeded up and the video quality can be substantially improved. the extensive simulation results show that the our proposed protocol is practical.

关键词： Vehicles Streaming media Peer to peer computing PSNR Ad hoc networks Transform coding Indexes

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Fast Snippet Generation Based on CPU-GPU Hybrid System

Fast Snippet Generation Based on CPU-GPU Hybrid System

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international conference on parallel and distributed systems (ICPADS)

作者： Ding Liu Ruixuan Li Xiwu Gu Kunmei Wen Heng He Guoqiang Gao Intelligent and Distributed Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei China

As an important part of searching result presentation, query-biased document snippet generation has become a popular method of search engines that makes the result list more informative to users. Generating a single snippet is a lightweight task. However, it will be a heavy workload to generate multiple snippets of multiple documents as the search engines need to process large amount of queries per second, and each result list usually contains several snippets. To deal with this heavy workload, we propose a new high-performance snippet generation approach based on CPU-GPU hybrid system. Our main contribution of this paper is to present a parallel processing stream for large-scale snippet generation tasks using GPU. We adopt a sliding document segmentation method in our approach which costs more computing resources but can avoid the common defect that the high relevant fragment may be cut off. the experimental results show that our approach gains a speedup of nearly 6 times in average process time compared with the baseline approach-Highlighter.

关键词： Graphics processing unit Search engines Time factors throughput Vectors Sorting parallel processing

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Lonestar: An Energy-Aware Disk Based Long-Term Archival Storage System

Lonestar: An Energy-Aware Disk Based Long-Term Archival Stor...

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international conference on parallel and distributed systems (ICPADS)

作者： Matthias Grawinkel Markus Pargmann Hubert Domer Andre Brinkmann Paderborn Center of Parallel Computing PC2 University of Paderborn Germany

We present the architecture for an disk based archival storage system and propose a new RAID scheme that is designed for "write once, read sometimes" workloads. By intertwining parity groups into a multi-dimensional RAID and improving the single disk reliability with intra-disk redundancy, the system achieves an elastic fault tolerance that can at least recover from all 3-disk failures. We do not stripe data to multiple disks and store related information to the same disks. Typically, all disks of the RAID are powered off, and for a read request, only a single disk has to be spun up, while write and rebuild processes require multiple disks. We analyzed our RAID scheme and showed that it provides a MTTDL that is orders of magnitudes higher than a set of RAID6 systems with a similar amount of disk drives. We also present and evaluate our prototype and show that it is well suited for archival scenarios.

关键词： Energy consumption Redundancy Arrays Servers Fault tolerant systems

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