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30th ACM International Conference on Information and Knowledge Management (CIKM)

作者： Wei, Xing Hu, Huiqi Zhou, Xuan Qi, Xuecheng Qian, Weining Wang, Jiang Zhou, Aoying East China Normal Univ Shanghai Peoples R China Huawei Shenzhen Peoples R China

ISBN: (纸本)9781450384469

distributed shared memory abstraction can coordinate a cluster of machine nodes to empower performance-critical queries with the scalable memory space and abundant parallelism. But to deploy the query under such an abstraction, the general execution model just makes operators expressed as multiple subtasks and sequentially schedule them in parallel, while neglecting those vital dependencies between subtasks and data. In this paper, we conduct the in-depth researches about the issues (i.e., low CPU Utilization and poor data locality) raised by the ignorance of dependencies, and then propose a dependency-aware query execution model called Jasmine, which can (i) help users explicitly declare the dependencies and (ii) take these declared dependencies into the consideration of execution to address the issues. We invite our audience to use the rich graphical interfaces to interact with Jasmine to explore the dependency-aware query execution on distributed shared memory.

关键词： distributed shared memory Task Scheduling Data Locality

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Is It Time To Rethink distributed shared memory Systems?

Is It Time To Rethink Distributed Shared Memory Systems?

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17th IEEE International Conference on Parallel and distributed Systems (ICPADS)

作者： Ramesh, Bharath Ribbens, Calvin J. Varadarajan, Srinidhi Virginia Tech Ctr High End Comp Syst Dept Comp Sci Blacksburg VA 24061 USA

ISBN: (纸本)9780769545769

We present core elements of Samhita, a new user-level software distributed shared memory (DSM) system. Our work is motivated by two observations. First, the rise of many-core architectures is producing a growing emphasis on threaded codes to achieve performance. Second, architectural trends, especially in high performance interconnects, suggest a new look at overcoming the bottlenecks that have hindered DSM performance. Samhita leverages the capabilities of remote direct memory access (RDMA) interconnects, and views the problem of providing a shared global address space as a cache management problem. Performance results on two 256 processor clusters demonstrate scalability on microbenchmarks and two real applications. The results are the largest scale tests and achieve the highest performance of any DSM system reported to date.

关键词： distributed shared memory distributed run-time systems distributed systems

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Exploring regional locality in distributed shared memory 4th

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4th Asian Computing Science Conference (ASIAN 98)

作者： Huang, ZY Sun, CZ Sattar, A Griffith Univ Sch Comp & Informat Technol Brisbane Qld 4111 Australia

ISBN: (纸本)3540653880

Two most commonly used classifications of reference locality are: temporal locality and spatial locality. This paper introduces a new class of reference locality, called Regional Locality, which is the program behavior that a set of addresses which are accessed in one critical or non-critical region will be very likely accessed as a whole in the same critical region or other nan-critical regions. We proposed three updates propagation protocols based on Regional Locality in distributed shared memory systems. These protocols include: Selective Lazy/Eager Updates Propagation protocol, First Hit Updates Propagation protocol, and Second Hit Updates Propagation protocol. Our experimental results indicate that Regional Locality exists in executions of many distributed shared memory concurrent programs. We have shown that the proposed protocols outperform the existing updates propagation protocols based on temporal locality. Exploring Regional Locality in other shared memory systems would be an interesting future research direction.

关键词： distributed shared memory temporal locality Regional Locality

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distributed shared memory with CAN-Based Prioritized Mutual Exclusion for Embedded Control Systems

Distributed Shared Memory with CAN-Based Prioritized Mutual ...

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2019第七届计算机与通信管理国际会议

作者： Hiroki Fujishima Takanori Yokoyama Myungryun Yoo Tokyo City University

The paper presents distributed shared memory(DSM) for embedded control systems with CAN(Controller Area Network),which is widely used in various control *** provides a location-transparent environment,in which distributed tasks exchange data through the *** are a few DSM for distributed embedded control systems,which,however,do not provide efficient inter-node mutual *** paper presents DSM with prioritized mutual exclusion,which is efficiently implemented using the CAN arbitration *** DSM is based on a multiple reader/multiple writer model and supports entry *** mutual exclusion also supports the multiprocessor priority ceiling protocol to avoid deadlocks and reduce the blocking *** have built the DSM in a RTOS,which is an extension to an OSEK *** have also evaluated the performance of the DMS and we think that the performance is acceptable for practical embedded control systems.

关键词： distributed shared memory Real-time operating system distributed systems Embedded control systems

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IMPLEMENTING OBJECT-BASED distributed shared memory ON TRANSPUTERS

IMPLEMENTING OBJECT-BASED DISTRIBUTED SHARED MEMORY ON TRANS...

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1994 World Transputer Congress (WTC 94) - Transputer Applications and Systems 94

作者： HEINZLE, HP BAL, HE LANGENDOEN, K FREE UNIV AMSTERDAM DEPT MATH & COMP SCI1007 MC AMSTERDAMNETHERLANDS

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An Edge Focused distributed shared memory 8th

An Edge Focused Distributed Shared Memory

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8th Conference on Cloud Computing, Big Data and Emerging Topics

作者： Teragni, Matias Moran, Ricardo Zabala, Gonzalo Univ Abierta Interamericana RA-983 San Juan Buenos Aires Argentina Comison Invest Cient Provincia Buenos Aires Calle 526 E-10 Y 11 La Plata Buenos Aires Argentina

ISBN: (纸本)9783030612177;9783030612184

Edge computing proposes access to largely unused computational resources without the added cost of the latency between the user and the Cloud. To take advantage of it we designed and implemented an abstraction layer compatible with standard JavaScript that builds a distributed shared memory on top of any existing web browser, like the ones present in smartphones or tablets, and a cloud server, enabling developers to use existing application code and enhance it by enabling collaboration between those devices. The synchronization mechanism supports mixed consistency, preferring eventual consistency but providing a stronger serializability when required, allowing the developers to tune it to their specific needs.

关键词： distributed shared memory Edge computing Eventually consistent

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A false-sharing free distributed shared memory management scheme

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IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 2000年第4期E83D卷 777-788页

作者： Lai, AIC Lei, CL Chiou, HH Natl Taiwan Univ Dept Elect Engn Taipei 10764 Taiwan

distributed shared memory (DSM) systems on top of network of workstations are especially vulnerable to the impact of false sharing because of their higher memory transaction overheads and thus higher false sharing penalties. In this paper we develop a dynamic-granularity shared memory management scheme that eliminates false sharing without sacrificing the transparency to conventional shared-memory applications. Our approach utilizes a special threaded splay tree (TST) for shared memory information management, and a dynamic token-based path-compression synchronization algorithm for data transferring. The combination of the TST and path compression is quite efficient;asymptotically, in an n-processor system with shared memory segments, synchronizing at most s segments takes O(s log m log n) amortized computation steps and generates O(s log n) communication messages, respectively. Based on the proposed scheme we constructed an experimental DSM prototype which consists of several Ethernet-connected Pentium-based computers running Linux. Preliminary benchmark results on our prototype indicate that our scheme is quite efficient, significantly outperforming traditional schemes and scaling up well.

关键词： distributed shared memory aggressive consistency distributed synchronization threaded splay tree false sharing

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An optimistic-based partition-processing approach for distributed shared memory systems

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JOURNAL OF INFORMATION SCIENCE AND ENGINEERING 2002年第6期18卷 853-869页

作者： Lin, JW Kuo, SY Fu Jen Catholic Univ Dept Comp Sci & Informat Engn Taipei 242 Taiwan Natl Taiwan Univ Dept Elect Engn Taipei 10764 Taiwan

This paper investigates the problem of network partitioning in distributed shared memory (DSM) systems. We propose an optimistic-based partition-processing approach, which can make shared pages available when network partitioning occurs. However, this approach does not guarantee that the same page in different partitions can maintain a consistent value. To eliminate this problem, a memory-based coordinated checkpoininting scheme is presented to save consistent states at low cost. If there are inconsistencies between two partitions, one saved consistent state is chosen to perform backward error recovery. Extensive trace-driven simulations have been performed to evaluate the effects of the proposed approach on system performance.

关键词： network partitioning distributed shared memory checkpointing backward error recovery trace-driven simulations

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Migrating-home protocol for software distributed shared memory

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JOURNAL OF INFORMATION SCIENCE AND ENGINEERING 2002年第6期18卷 929-957页

作者： Cheung, BWL Wang, CL Lau, FCM Univ Hong Kong Dept Comp Sci & Informat Syst Hong Kong Hong Kong Peoples R China

The efficiency of Software distributed shared memory (DSM) is often limited by the excessive amount of network communication in maintaining the memory consistency of the system. Two of the most popular software solutions to reduce redundant data traffic are relaxed memory consistency models and traffic-thrifty coherence protocols. In this paper, we propose the migrating-home protocol for a relaxed memory consistency model, the scope consistency model. The protocol allows the processor storing the most up-to-date copy of a page to change from one processor to another, so as to better adapt to the memory access patterns of DSM applications. The new protocol has been implemented in a DSM system running on a 16-node Pentium III 450MHz PC cluster. We analyzed not only the execution time of the benchmark programs, but also the communication and page fault patterns via a new analysis approach. It is shown that our DSM system reduces the amount of network communication and handles page faults more efficiently. The benchmark results provide concrete evidence for the substantial performance improvement obtained by our system.

关键词： clustering computing distributed shared memory memory consistency model coherence protocol home-based protocol migrating-home protocol JUMP

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A HYBRID COHERENCE SCHEME FOR SOFTWARE distributed shared memory

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International Journal of High Speed Computing 1994年第4期6卷 519-536页

作者： HSIAO-HSI WANG RUEI-CHUAN CHANG Department of Computer Science and Information Engineering National Chiao Tung University Hsinchu Taiwan Republic of China Institute of Computer and Information Science National Chiao Tung University Hsinchu Taiwan Republic of China To whom all correspondence should be sent. He is also with the Institute of Information Science Academia Sinica Nankang Taipei Republic of China.

Software distributed shared memory (DSM) provides a convenient and effective solution for programming parallel applications on distributed systems. However, the performance of current implementations suffers from large overhead in enforcing memory coherence. Coherence faults are the sources of massive network traffic. Various memory consistency models have been proposed in order to eliminate the effects of network traffic and memory latency. In this paper, we present a novel approach that combines relaxed memory consistency models and a compiler strategy to solve memory coherence problems for DSM. This approach produces fewer coherence faults. Experimental results also show this hybrid approach is effective for reducing the memory coherence overhead of DSM.

关键词： distributed shared memory memory coherence false sharing hybrid coherence scheme

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