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ER-KV: High Performance Hybrid Fault-Tolerant Key-Value Store 23

ER-KV: High Performance Hybrid Fault-Tolerant Key-Value Stor...

引用

23rd IEEE international conference on High Performance computing and Communications, 7th IEEE international conference on Data Science and systems, 19th IEEE international conference on Smart City and 7th IEEE international conference on Dependability in Sensor, Cloud and Big Data systems and Applications, HPCC-DSS-SmartCity-DependSys 2021

作者： Geng, Yingjie Luo, Jinfei Wang, Gang Liu, Xiaoguang College of Computer Science Tklndst Nankai University Tianjin China

ISBN: (纸本)9781665494571

In-memory Key-Value store (KV-store) has been widely used to meet increasing performance requirements. Such system stores user data in main memory and when a node fails, all data will be lost due to the volatile nature of DRAM. Therefore, it usually takes fault-tolerance mechanisms such as primary-backup replication (PBR) and erasure coding to ensure reliability and availability. PBR achieves high availability and scalability at the cost of high data redundancy. Erasure coding has higher utilization of storage but introduces additional computing and network overhead. This paper presents a high-performance fault-tolerant distributed KV-store, the Erasure-coded Replication KV (ER-KV), which takes advantage of both erasure coding and PBR by applying a two-level fault-tolerant mechanism. To achieve both fast recovery speed and low storage overhead, ER-KV gives priority to PBR for fault tolerance but will turn to erasure coding for data recovery when backup nodes are all offline. When generating parity data, ER-KV leverages erasure coding for large value while applying PBR to small-sized key to avoid frequent encoding and decoding. ER-KV also introduces pipelining into erasure coding to improve system performance, and simultaneously, ER-KV still maintains data consistency. Besides, ER-KV applies persistent memory (PM) to achieve the persistence of redundant data and improve recovery speed. We have applied ER-KV to Redis and the experimental results show that it saves 33% of storage compared with PBR. As for erasure coding, ER-KV has higher recovery efficiency and system availability. And it also brings 15X-80X speedup in data reconstruction when applying PM to backup nodes. © 2021 IEEE.

关键词： Fault tolerance Costs Smart cities System performance Scalability Fault tolerant systems Redundancy

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A robust distributed generalized matching protocol that stabilizes in linear time

A robust distributed generalized matching protocol that stab...

引用

international conference on distributed computing systems Workshop

作者： W. Goddard S.T. Hedetniemi D.R. Jacobs P.K. Srimani Department of Computer Science Clemson University Clemson SC USA

We present a self-stabilizing algorithm for finding a generalized maximal matching (b-matching) in an arbitrary distributed network. We show that the algorithm converges in O(m) moves under an unfair central demon independent of the b-values at different nodes. The algorithm is capable of working with multiple types of demons (schedulers) as is the most recent algorithm in [1, 2].

关键词： Robustness Protocols Fault tolerant systems Costs Scheduling algorithm Intelligent networks Jacobian matrices Computer science Delay Bandwidth

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Trellis-SDP: A simple data-parallel programming interface

Trellis-SDP: A simple data-parallel programming interface

引用

33rd international conference on Parallel Processing

作者： Ding, M Lu, P Univ Alberta Dept Comp Sci Edmonton AB T6G 2E8 Canada

ISBN: (纸本)0769521983

Some datasets and computing environments are inherently distributed. For example, image data may be gathered and stored at different locations. Although data parallelism is a well-known computational model, there are few programming systems that are both easy to program (for simple applications) and can work across administrative domains. We have designed and implemented a simple programming system, called Trellis-SDP, that facilitates the rapid development of data-intensive applications. Trellis-SDP is layered on top of the Trellis infrastructure, a software system for creating overlay metacomputers: user-level aggregations of computer systems. Trellis-SDP provides a master-worker programming framework where the worker components can run self-contained, new or existing binary applications. We describe two interface functions, namely trellis_scano() and trellis_gather(), and show how easy it is to get reasonable performance with simple data-parallel applications, such as Content Based Image Retrieval (CBIR) and Parallel Sorting by Regular Sampling (PSRS).

关键词： Parallel processing systems

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Profiling with helper threads

Profiling with helper threads

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IASTED international conference on Parallel and distributed computing and Networks, as part of the 23rd IASTED international Multi-conference on Applied Informatics

作者： Tokunaga, Takamasa Sato, Toshinori OMRON Corporation PRESTO JST

Dynamic optimization technology improves its target system on the fly according to the system status. There are some studies on microprocessors to dynamically improve performance and energy efficiency. We are investigating a software-based dynamic optimization mechanism on a multi-threaded processor to improve performance. Optimization is performed on binary codes. To optimize binary codes dynamically, profile information is required. Gathering profiles suffers overhead, and thus low overhead scheme is strongly required. This paper proposes to utilize helper threads to gather profile information with little overhead. Simulation results are also presented.

关键词： distributed parameter control systems

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Game-Theoretic Analysis of an Incentivized Verifiable Computation System 4th

Game-Theoretic Analysis of an Incentivized Verifiable Comput...

引用

23rd international conference on Financial Cryptography and Data Security

作者： Nabi, Mahmudun Avizheh, Sepideh Kumaramangalam, Muni Venkateswarlu Safavi-Naini, Reihaneh Univ Calgary Calgary AB Canada

ISBN: (纸本)9783030437244;9783030437251

Outsourcing computation allows a weak client to outsource its computation to a powerful server and receive the result of the computation. Verifiable outsourcing enables clients to verify the computation result of untrusted servers. Permissionless distributed outsourcing systems provide an attractive marketplace for users to participate in the system as a problem-giver who needs solution to a problem, or problemsolver who is willing to sell its computational resources. Verification of computation in these systems, that do not assume trusted computational nodes, is a challenging task. In this paper we provide a game-theoretic analysis of an incentivized outsourcing computation system, proposed by Harz and Boman [Harz et al. 2018] (HB), at WTSC 2018 (FC Workshop), and show that the system is vulnerable to collusion and Sybil attacks, that result in incorrect solutions to be accepted by the system. We also show that malicious computational node can succeed in polluting the blockchain. We propose modifications to the system that incentivizes honest behavior, and improve the system's correctness guarantee. We provide a high-level analysis of the modified system using our game theoretic approach, and show the effectiveness of the proposed modifications.

关键词： Outsourcing computation Verifiable distributed computation Rational adversaries Incentivized security

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AHEAD: A Tool for Projecting Next-Generation Hardware Enhancements on GPU-Accelerated systems 33

AHEAD: A Tool for Projecting Next-Generation Hardware Enhanc...

引用

33rd IEEE international Parallel and distributed Processing Symposium (IPDPS)

作者： Abdelhafez, Hazem A. Zimmer, Christopher Vazhkudai, Sudharshan S. Ripeanu, Matei Univ British Columbia Elect & Comp Engn Vancouver BC Canada Oak Ridge Natl Lab Natl Ctr Computat Sci Oak Ridge TN USA

ISBN: (纸本)9781538655559

Starting with the Titan supercomputer (at the Oak Ridge Leadership computing Facility, OLCF) in 2012, top supercomputers have increasingly leveraged the performance of GPUs to support large-scale computational science. The current No. 1 machine, the 200 petaflop Summit system at OLCF, is a GPU-based machine. Accelerator-based architectures, however, add additional complexity due to node heterogeneity. To inform procurement decisions, supercomputing centers need the tools to quickly model the impact of changes of the node architectures on application performance. We present AHEAD, a profiling and modeling tool to quantify the impact of intra-node communication mechanism (e.g., PCI or NVLink) on application performance. Our experiments show average weighted relative errors of similar to 19% and similar to 23% for five CORAL-2 (a collaboration between multiple US Department of Energy, DOE, labs to procure exascale systems) and 12 Rodinia benchmarks respectively, without running the applications on the target future node.

关键词： Computational modeling Data transfer Graphics processing units Data models Analytical models Tools Kernel

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A proximity-aware load balancing algorithm in P2P systems

A proximity-aware load balancing algorithm in P2P systems

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3rd international conference on Grid and Pervasive computing Symposia/workshops, GPC 2008

作者： Sun, Jianhua Li, Juan Chen, Hao Tan, Huailiang Adv. Internet and Media Lab. School of Comp. and Comm. Hunan Univ. Changsha 410082 China

ISBN: (纸本)9780769531779

In structured P2P systems, the heterogeneity of node capacity and semantic relativity of keys can cause load imbalance among nodes. Aiming at the problem of tasks distributed unbalancedly among nodes in large-scale DHT networks, an efficient proximity-aware algorithm is presented in this paper. The node with light load constructs a star-like structure with other nodes physically close to it. The physical location information is generated by network positioning algorithm. And then, load can be transferred within the star-like structure. Simulation experiments show that the algorithm can achieve good load balance and the load movement cost reduction rate is above 40%. © 2008 IEEE.

关键词： Cost reduction

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A scalable hash-based mobile agent location mechanism

A scalable hash-based mobile agent location mechanism

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international conference on distributed computing systems Workshop

作者： G. Kastidou E. Pitoura G. Samaras Department of Computer Science University of Ioannina (UoI) Greece Department of Computer Science University of Cyprus Cyprus

In this paper, we propose a novel mobile agent tracking mechanism based on hashing. To allow our system to adapt to variable workloads, dynamic rehashing is supported The proposed mechanism scales well with both the number of agents and the number of moving and querying operations. We also report on its implementation in the Aglets platform and present performance results.

关键词： Mobile agents Computer science Mobile communication Network servers Mobile computing Real time systems Information retrieval Open systems Merging Load management

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Interacting agents in networks: E-auction and emergence in E-marketing

Interacting agents in networks: E-auction and emergence in E...

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international conference on distributed computing systems Workshop

作者： V.K. Murthy E.V. Krishnamurthy School of Computer Science UNSW@ADFA University of New South Wales Canberra ACT Australia Computer Sciences Laboratory Australian National University Canberra ACT Australia

This paper describes how a set of agents can be used for collaboration in E-marketing and-E-Auction. We have formalized an integrated model consisting of the salient features of several agent paradigms, and link it with the distributed software engineering methodology. The integrated model proposed here has the simplicity and adaptability for realisation as a distributed transaction based paradigm for negotiation and other E-marketing problems. Also it can provide an insight into the self-organized criticality in a network of agents.

关键词： Intelligent networks Collaboration Australia Software engineering distributed computing Multiagent systems Computer science Laboratories Information systems Mobile agents

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A distributed system for answering range queries on sensor network data

A distributed system for answering range queries on sensor n...

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3rd IEEE international conference on Pervasive computing and Communications

作者： Cuzzocrea, A Furfaro, F Greco, S Masciari, E Mazzeo, GM Saccà, D Univ Calabria DEIS I-87030 Commenda Di Rende Italy

ISBN: (纸本)0769523005

A distributed system for approximate query answering on sensor network data is proposed, where a suitable compression technique is exploited to represent data and support query answering. Each node of the system stores either detailed or summarized sensor readings. Query answers are computed by identifying the set of nodes that contain (either compressed or not) data involved in the query, and eventually partitioning the query in a set of sub-queries to be evaluated at different nodes. Queries are partitioned according to a cost model aiming at making the evaluation efficient and guaranteeing the desired degree of accuracy of query answers.

关键词： distributed computer systems

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