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共 303 条记录，以下是111-120 订阅

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Elasticity Controller for Cloud-Based Key-Value Stores

Elasticity Controller for Cloud-Based Key-Value Stores

引用

IEEE 18th international conference on parallel and distributed systems (ICPADS)

作者： Arman, Ala Al-Shishtawy, Ahmad Vlassov, Vladimir KTH Royal Inst Technol Stockholm Sweden

ISBN: (纸本)9781467345651;9780769549033

Clouds provide an illusion of an infinite amount of resources and enable elastic services and applications that are capable to scale up and down (grow and shrink by requesting and releasing resources) in response to changes in its environment, workload, and Quality of Service (QoS) requirements. Elasticity allows to achieve required QoS at a minimal cost in a Cloud environment with its pay-as-you-go pricing model. In this paper, we present our experience in designing a feedback elastically controller for a key-value store. the goal of our research is to investigate the feasibility of the control theoretic approach to the automation of elasticity of Cloud-based key-value stores. We describe design steps necessary to build a feedback controller for a real system, namely Voldemort, which we use as a case study in this work. the design steps include defining touchpoints (sensors and actuators), system identification, and controller design. We have designed, developed, and implemented a prototype of the feedback elasticity controller for Voldemort. Our initial evaluation results show the feasibility of using feedback control to automate elasticity of distributed key-value stores.

关键词： Cloud computing Elasticity Feedback Control Key-Value Store Voldemort

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More Effective Synchronization Scheme in ML using Stale Parameters

More Effective Synchronization Scheme in ML using Stale Para...

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18th IEEE international conference on High Performance computing and Communications (HPCC) / 14th IEEE international conference on Smart City (Smart City) / 2nd IEEE international conference on Data Science and systems (DSS)

作者： Li, Yabin Wan, Han Jiang, Bo Long, Xiang Beihang Univ Sch Comp Sci & Engn Beijing Peoples R China

ISBN: (纸本)9781509042975

In Machine learning (ML) the model we use is increasingly important, and the model's parameters, the key point of the ML, are adjusted through iteratively processing a training dataset until convergence. Although data-parallel ML systems often engage a perfect error tolerance when synchronizing the model parameters for maximizing parallelism, the synchronization of model parameters may delay in completion, a problem that generally gets worse at a large scale. this paper presents a Bounded Asynchronous parallel (BAP) model of computation that allows computations using stale model parameters in order to reduce synchronization overheads. In the meanwhile, our BAP model ensures theoretical convergence guarantees for large scale data-parallel ML applications. this model permits distributed workers to use the stale parameters storing in the local cache, instead of waiting until the Parameter Server (PS) produces a new version. this expressively reduces the time workers spend on waiting. Furthermore, the BAP model guarantees the convergence of ML algorithm by bounding the maximum distance of the stale parameters. Experiments conducted on 4 cluster nodes with up to 32 GPUs showed that our model significantly improved the proportion of computing time relative to the waiting time and led to 1.2-2 X speedup. Besides, we elaborated how to choose the staleness threshold when considering the tradeoff between Efficiency and Speed.

关键词： distributed systems Bounded Asynchronous parallel Bulk Synchronous parallel Total Asynchronous parallel stale parameters tradeoff

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Towards Cooperation between Multiple Video Retrieval systems Based on Impression 18

Towards Cooperation between Multiple Video Retrieval Systems...

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18th IEEE/ACIS international conference on Software Engineering, Artificial Intelligence, Networking and parallel/distributed computing (SNPD)

作者： Maeda, Tomoki Hochin, Teruhisa Nomiya, Hiroki Kyoto Inst Technol Grad Sch Informat Sci Kyoto Japan Kyoto Inst Technol Informat & Human Sci Kyoto Japan

ISBN: (纸本)9781509055043

this paper proposes a method to convert a factor score matrix for the cooperation between multiple video retrieval systems based on impression. A matrix transforming the factor loading matrix is used. As a result, we showed that the results of two applications of the factor analysis can satisfactorily be transformed by using the transformation matrix.

关键词： Keywords Multiple Video Retrieval System Adaptation Factor Analysis Multiple Regression Analysis

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Leveraging Cloud Infrastructure for Troubleshooting Edge computing systems

Leveraging Cloud Infrastructure for Troubleshooting Edge Com...

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IEEE 18th international conference on parallel and distributed systems (ICPADS)

作者： Fagan, Michael Khan, Mohammad Maifi Hasan Wang, Bing Univ Connecticut Dept CSE Storrs CT 06269 USA

ISBN: (纸本)9781467345651;9780769549033

Modern cloud-based applications (e.g., Facebook, Dropbox) serve a wide range of edge clients (e.g., laptops, smartphones). the clients' characteristics vary significantly in terms of hardware, operating systems, network connections, and software versions, just to name a few. Unfortunately, due to misconfiguration, outdated software, faulty hardware, or other reasons, many edge systems operate at suboptimal performance. Identifying poor performance and root causes is extremely challenging for the client of the cloud system. In this paper, we propose a novel troubleshooting service that leverages such heterogeneity to identify and debug performance problems on edge devices. First, by looking at many runs across many different clients, the service groups clients into different clusters based on performance. Next, the service enables logging on remote clients to collect run time traces, and subsequently identifies the root cause by analyzing logs automatically. We leverage high level features such as machine/OS type along with more low level kernel level statistics such as I/O rate and system calls. To demonstrate our system, we first introduce a configuration bug that was artificially injected in a recently built cluster by changing the TCP buffer size. Next, we present two real-life case studies, one related to I/O inefficiency on Android platform, and another misconfiguration bug in VirtualBox, that were identified using our tool.

关键词： automated debugging system calls middleware cloud service distributed computing

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Dictionary Attack on TRUECRYPT with RIVYERA S3-5000

Dictionary Attack on TRUECRYPT with RIVYERA S3-5000

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IEEE 18th international conference on parallel and distributed systems (ICPADS)

作者： Abbas, Ayman Rathje, Claas Anders Wienbrandt, Lars Schimmler, Manfred Univ Kiel Dept Comp Sci D-24098 Kiel Germany

ISBN: (纸本)9781467345651;9780769549033

the popular free encryption software TRUECRYPT uses whole device or partition encryption as well as encrypted container files to protect sensible data from unauthorized access. Several combinations of encryption algorithms and hash functions used for the key derivation can be chosen by the user. this paper regards the combination with SERPENT as encryption algorithm and WHIRLPOOL as hash function for the key derivation. A dictionary attack has been implemented for this combination using the FPGA-based high-performance computer RIVYERA S3-5000. the achieved performance reaches more than 200,000 passwords per second. Compared to 820 passwords per second, achieved by a fully threaded Intel Core i7-970 system at 3.2GHz using the Crypto++ library, this leads to a speedup of more than 247 with energy savings of about 99%.

关键词： known-plaintext dictionary attack SERPENT WHIRLPOOL PBKDF2 FPGA reconfigurable high-performance computing

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Comparing the Performance of Blue Gene/Q with Leading Cray XE6 and InfiniBand systems.

Comparing the Performance of Blue Gene/Q with Leading Cray X...

引用

IEEE 18th international conference on parallel and distributed systems (ICPADS)

作者： Kerbyson, Darren J. Barker, Kevin J. Vishnu, Abhinav Hoisie, Adolfy Pacific NW Natl Lab PAL Richland WA 99352 USA

ISBN: (纸本)9781467345651;9780769549033

three types of systems dominate the current High Performance computing landscape: the Cray XE6, the IBM Blue Gene, and commodity clusters using InfiniBand. these systems have quite different characteristics making the choice for a particular deployment difficult. the XE6 uses Cray's proprietary Gemini 3-D torus interconnect with two nodes at each network endpoint. the latest IBM Blue Gene/Q uses a single socket integrating processor and communication in a 5-D torus network. InfiniBand provides the flexibility of using nodes from many vendors connected in many possible topologies. the performance characteristics of each vary vastly along with their utilization model. In this work we compare the performance of these three systems using a combination of micro-benchmarks and a set of production applications. We also discuss the causes of variability in performance across the systems and quantify where performance is lost using a combination of measurements and models. Our results show that significant performance can be lost in normal production operation of the Cray XE6 and InfiniBand Clusters in comparison to Blue Gene/Q.

关键词： High Performance computing Performance Evaluation Performance Modeling Application Analysis

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Design of the SAgent security framework for JADE

Design of the SAgent security framework for JADE

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18th IASTED international conference on parallel and distributed computing and systems

作者： Gunupudi, Vandana Tate, Stephen R. Univ North Texas Dept Comp Sci & Engn Denton TX 76203 USA

ISBN: (纸本)9780889866386

In this paper, we present the design of SAgent, a general-purpose mobile agent security framework. SAgent is designed for comprehensive protection of mobile agent computations and data in potentially hostile environments and works with the JADE (Java Agent DEvelopment) platform [1], a FIPA-compliant multi-agent environment. Using good software engineering design techniques of software reusability and abstraction, SAgent allows agent protection protocols and applications to be developed independently of each other. To accomplish this, a clean conceptual framework is presented which encapsulates in several general class interfaces the common security functionality required by secure agent applications. Since SAgent is designed to generically protect the computations of mobile agent applications, we provide implementations of two secure multiagent protocols that protect the confidentiality of agent data as well as implementations of four methods that protect the integrity of mobile agent data. Experimental results showing the feasibility of these methods are available in separate publications [2] [3]. the goal of SAgent is to provide a framework where proposed theoretical techniques can be used and experimentally evaluated. SAgent allows a new security provider to implement and experiment with new techniques for protecting mobile agents in a well-defined manner and is generic enough to support both software-based and hardware-based protections.

关键词： software development software reuse distributed agents mobile agent security frameworks for mobile agents

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Approximating the Buffer Allocation Problem using epochs

Approximating the Buffer Allocation Problem using epochs

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18th IASTED international conference on parallel and distributed computing and systems

作者： Pedersen, Jan Baekgaard Brodsky, Alex Univ Nevada Sch Comp Sci 4505 Maryland Pkwy Las Vegas NV 89154 USA Univ Winnipeg Dept Appl Comp Sci Winnipeg MB R3B 2E9 Canada

ISBN: (纸本)9780889866386

the correctness of applications that perform asynchronous message passing typically relies on the underlying hardware having a sufficient amount of memory (message buffers) to hold all undelivered messages-such applications may deadlock when executed on a system with an insufficient number of message buffers. thus, determining the minimum number of buffers that an application needs to prevent deadlock is an important task when writing or porting parallel applications. Unfortunately, both this problem (called the Buffer Allocation Problem) and the simpler problem of determining whether an application may deadlock for a given number of available message buffers are intractable [1]. We present a new epoch-based polynomial-time approach for approximating the Buffer Allocation Problem. Our approach partitions application executions into epochs and intersperses barrier synchronizations between them, thus limiting the number of message buffers necessary to ensure deadlock-freedom. this approach produces near optimal solutions for many common cases and can be adapted to guide application modifications that ensure deadlock freedom when the application is ported. Lastly, we describe a space-time trade-off between the number of available message buffers and the number of barrier synchronizations, and describe how this trade-off can be used to fine-tune application performance.

关键词： resource allocation parallel programming message passing systems

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Model-driven Level 3 BLAS Performance Optimization on Loongson 3A Processor

Model-driven Level 3 BLAS Performance Optimization on Loongs...

引用

IEEE 18th international conference on parallel and distributed systems (ICPADS)

作者： Zhang Xianyi Wang Qian Zhang Yunquan Chinese Acad Sci Inst Software Lab Parallel Software & Computat Sci Beijing 100190 Peoples R China

ISBN: (纸本)9781467345651;9780769549033

Every mainstream processor vendor provides an optimized BLAS implementation for its CPU, as BLAS is a fundamental math library in scientific computing. the Loongson 3A CPU is a general-purpose 64-bit MIPS64 quad-core processor, developed by the Institute of computing Technology, Chinese Academy of Sciences. To date, there has not been a sufficiently optimized BLAS on the Loongson 3A CPU. the purpose of this research is to optimize level 3 BLAS performance on the Loongson 3A CPU. We analyzed the Loongson 3A architecture and built a performance model to highlight the key point, L1 data cache misses, which is different from level 3 BLAS optimization on the mainstream x86 CPU. therefore, we employed a variety of methods to avoid L1 cache misses in single thread optimization, including cache and register blocking, the Loongson 3A 128-bit memory accessing extension instructions, software prefetching, and single precision floating-point SIMD instructions. Furthermore, we improved parallel performance by reducing bank conflicts among multiple threads in the shared L2 cache. We created an open source BLAS project, OpenBLAS, to demonstrate the performance improvement on the Loongson 3A quad-core processor.

关键词： BLAS Loongson 3A MIPS64 Optimization Multi-core

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CPDID: A Novel CDN-P2P Dynamic Interactive Delivery Scheme for Live Streaming

CPDID: A Novel CDN-P2P Dynamic Interactive Delivery Scheme f...

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IEEE 18th international conference on parallel and distributed systems (ICPADS)

作者： Lu, Zhihui Wu, Jie Huang, Yi Chen, Lijiang Deng, Da Fudan Univ Sch Comp Sci Shanghai 20043 Peoples R China

ISBN: (纸本)9781467345651;9780769549033

Although many streaming application providers have relied on CDN services, there are several barriers to making CDN a more common service: expensive construction cost and fixed service mode. the rise of cloud computing requires "CDN as a Service" with a more open service mode, which requires content services available on-demand and be utilized in an open and loosely-coupled fashion. In most of the current streaming systems, CDN provides serve requesters with a passive and static state, there is no dynamic interaction with P2P systems, so the total CDN-P2P-Hybrid efficiency is not high. In this paper, we present CPDID: a CDN-P2P Dynamic Interactive Delivery scheme for Live Streaming. We explore CPDID architecture based on REST intercace and JSON message format. And then we propose an identifying and selecting 'upload amplification nodes' algorithm to more efficiently utilize CDN resource. Our experimental results show that CPDID achieves at least 10-25% performance improvement compared with the existing native CDN-P2P-Hybrid schemes. At last, we analyze the prospective research direction and propose our future work.

关键词： CDN Cloud computing P2P Streaming CDN-P2P-Hybrid Architecture Live Streaming VoD Streaming

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