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检索条件"任意字段=International Symposium on Databases in Parallel and Distributed Systems"

共 9676 条记录，以下是91-100 订阅

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Combining Lossy Compression with Multi-level Caching for Data Staging over Network

Combining Lossy Compression with Multi-level Caching for Dat...

引用

1st international Conference on Smart Energy systems and Artificial Intelligence (SESAI)

作者： Aoyagi, Rei Takahashi, Keichi Shimomura, Yoichi Takizawa, Hiroyuki Tohoku Univ Grad Sch Informat Sci Sendai Miyagi Japan Tohoku Univ Cybersci Ctr Sendai Miyagi Japan

ISBN: (纸本)9798350364613;9798350364606

Researchers conduct post-processing on the simulation results by running an interactive data analysis tool on a High-Performance Computing (HPC) system installed at an HPC center and retrieving the post-processed results. Certain data analysis scenarios require to transfer the simulation results directly from the center. in such scenarios, a portion of the data would usually be streamed over the network to achieve interactivity. However, there still exist two challenges in maintaining interactivity: (1) limited network bandwidth and (2) long network latency. To tackle these challenges, we propose a system to enable interactive array analysis over the network. We employ error-bounded lossy compression to increase the effective network bandwidth. Furthermore, we employ multi-level caching to hide the network latency and combine prefetching to improve the cache hit ratio. The cache replacement and prefetching policies are designed considering the data access pattern of interactive analysis. We compared our proposed system with TileDB, one of the state-of-the-art array databases, by measuring the average latency for various access patterns. Compared to TileDB, the proposed system reduces the average latency by up to 91.6% by allowing 10% of error because the cache hit ratio was improved by more than 40% due to the proper cache replacement and prefetching policy and network transfer time was reduced more than 75% by using lossy compression.

关键词： HPC distributed Computing Data Staging Lossy Compression Interactive Analysis Bandwidth Software Caching

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A distributed Stealth Address Generation Protocol for Threshold Signatures 22

A Distributed Stealth Address Generation Protocol for Thresh...

引用

22nd IEEE international symposium on parallel and distributed Processing with Applications, ISPA 2024

作者： Wang, Yujue Zhong, Lin Du, Jun Zou, Yudi He, Kevin Zhang, Andrew Hangzhou Innovation Institute Beihang University Hangzhou China Sinohope Technology Holdings Limited Hong Kong Bitlayer Labs Ltd Vistra Corporate Service Centre British Virgin Islands

ISBN: (纸本)9798331509712

Stealth addresses protect recipient identity privacy in blockchain systems by allowing a sender to derive a stealth address using the recipient's public key, with the receiver deriving a corresponding one-time private key. In threshold signatures, where distributed recipient entities only hold private key shares and the full private key never appears, this becomes challenging. To address this, we propose a distributed stealth address generation (DSAG) protocol for threshold signatures. In our approach, distributed sender entities derive the stealth address, and distributed recipient entities derive corresponding one-time private key shares using Lagrange interpolation. The correctness of these shares is verified by ensuring that they satisfy the necessary Lagrange interpolation and discrete logarithm relationships. Our protocol avoids bilinear mappings and relies solely on elliptic curve exponentiations, leading to higher efficiency. Experimental tests demonstrate that our scheme instance takes just 4 milliseconds confirming its practicality. © 2024 IEEE.

关键词： Authentication Protocol

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Black-Box Stability Analysis Method for Dual parallel Pulse Power Load 14

Black-Box Stability Analysis Method for Dual Parallel Pulse ...

引用

14th IEEE international symposium on Power Electronics for distributed Generation systems, PEDG 2023

作者： Chen, Xu Xu, Jianping Yang, Ping Chen, Zhengge Qi, Jin Tang, Xi Southwest Jiaotong University School of Electrical Engineering Chengdu China

ISBN: (纸本)9798350328233

The impedance of power source of the microgrid cannot be regarded as infinite, thus it may cause stability problems, especially when the load is a pulse power load. The black box method can not be well applied to pulse power load. To address this issue, a black-box stability analysis method for system with parallel pulse loads is proposed in this paper. Based on the stability condition of the system with single load, the stability condition of the system with parallel load is derived. Finally, 3-D fitting Bode plot are given to analyze the stability of the system with parallel load. Simulations results are given to verify the analysis results. © 2023 IEEE.

关键词： Bode diagrams

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Essentials of parallel Graph Analytics 36

Essentials of Parallel Graph Analytics

引用

36th IEEE international parallel and distributed Processing symposium (IEEE IPDPS)

作者： Osama, Muhammad Porumbescu, Serban D. Owens, John D. Univ Calif Davis Davis CA 95616 USA

ISBN: (纸本)9781665497473

We identify the graph data structure, frontiers, operators, an iterative loop structure, and convergence conditions as essential components of graph analytics systems based on the native-graph approach. Using these essential components, we propose an abstraction that captures all the significant programming models within graph analytics, such as bulksynchronous, asynchronous, shared-memory, message-passing, and push vs. pull traversals. Finally, we demonstrate the power of our abstraction with an elegant modern C++ implementation of single-source shortest path and its required components.

关键词： parallel graph analytics graph traversal algorithms

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The Logarithmic Random Bidding for the parallel Roulette Wheel Selection with Precise Probabilities

The Logarithmic Random Bidding for the Parallel Roulette Whe...

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1st international Conference on Smart Energy systems and Artificial Intelligence (SESAI)

作者： Nakano, Koji Hiroshima Univ Grad Sch Adv Sci & Engn Kagamiyama 1-4-1 Higashihiroshima 7398527 Japan

ISBN: (纸本)9798350364613;9798350364606

The roulette wheel selection is a critical process in heuristic algorithms, enabling the probabilistic choice of items based on assigned fitness values. It selects an item with a probability proportional to its fitness value. This technique is commonly employed in ant-colony algorithms to randomly determine the next city to visit when solving the traveling salesman problem. Our study focuses on parallel algorithms designed to select one of multiple processors, each associated with fitness values, using random wheel selection. We propose a novel approach called logarithmic random bidding, which achieves an expected runtime logarithmic to the number of processors with non-zero fitness values, using the CRCW-PRAM model with a shared memory of constant size. Notably, the logarithmic random bidding technique demonstrates efficient performance, particularly in scenarios where only a few processors are assigned non-zero fitness values.

关键词： roulette wheel selection fitness proportionate selection ant colony optimization traveling salesman problem parallel heuristic algorithms

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In-Memory Indexed Caching for distributed Data Processing 36

In-Memory Indexed Caching for Distributed Data Processing

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36th IEEE international parallel and distributed Processing symposium (IEEE IPDPS)

作者： Uta, Alexandru Ghit, Bogdan Dave, Ankur Rellermeyer, Jan Boncz, Peter Leiden Univ LIACS Leiden Netherlands Databricks San Francisco CA USA Univ Calif Berkeley Berkeley CA USA Delft Univ Technol Delft Netherlands CWI Amsterdam Netherlands

ISBN: (纸本)9781665481069

Powerful abstractions such as dataframes are only as efficient as their underlying runtime system. The de-facto distributed data processing framework, Apache Spark, is poorly suited for the modern cloud-based data-science workloads due to its outdated assumptions: static datasets analyzed using coarse-grained transformations. In this paper, we introduce the Indexed DataFrame, an in-memory cache that supports a dataframe abstraction which incorporates indexing capabilities to support fast lookup and join operations. Moreover, it supports appends with multi-version concurrency control. We implement the Indexed DataFrame as a lightweight, standalone library which can be integrated with minimum effort in existing Spark programs. We analyze the performance of the Indexed DataFrame in cluster and cloud deployments with real-world datasets and benchmarks using both Apache Spark and Databricks Runtime. In our evaluation, we show that the Indexed DataFrame significantly speeds-up query execution when compared to a nonindexed dataframe, incurring modest memory overhead.

关键词： distributed processing Runtime Data analysis Cluster computing Relational databases Libraries Concurrency control

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Shared-Memory parallel Dynamic Louvain Algorithm for Community Detection

Shared-Memory Parallel Dynamic Louvain Algorithm for Communi...

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1st international Conference on Smart Energy systems and Artificial Intelligence (SESAI)

作者： Sahu, Subhajit Kothapalli, Kishore Banerjee, Dip Sankar Int Inst Informat Technol Hyderabad Hyderabad 500032 India Indian Inst Tehnol Jodhpur Surpura Bypass Rd Karwar 342030 Rajasthan India

ISBN: (纸本)9798350364613;9798350364606

Community detection refers to the identification of coherent partitions in networks. In this poster, we present a parallel dynamic Louvain algorithm that finds conummities in rapidly evolving graphs. Given a batch update of edge deletions or insertions, our algorithm identifies an approximate set of affected vertices in the graph with minimal overhead and updates the community membership of each vertex. This process repeats until convergence. Our approach achieves a mean speedup of 7.3 x, compared to our parallel and optimized implementation of Delta-screening combined with Louvain, a recently proposed stateof-the-art approach.

关键词： Population dynamics

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Communication-Computation Overlapping for parallel Multigrid Methods

Communication-Computation Overlapping for Parallel Multigrid...

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1st international Conference on Smart Energy systems and Artificial Intelligence (SESAI)

作者： Nakajima, Kengo Univ Tokyo Informat Technol Ctr RIKEN R CCS Tokyo Japan

ISBN: (纸本)9798350364613;9798350364606

Preconditioned iterative methods based on the Krylov subspace technique are widely employed in various scientific and technical computing. When utilizing large-scale parallel computing systems, the communication overhead tends to increase with the growth in the number of nodes, making its reduction a crucial challenge. In parallel finite element methods (FEM) and finite volume methods (FVM), halo communication and computation overlapping (CC-Overlapping) are commonly employed, often in conjunction with the dynamic loop scheduling feature of OpenMP. This approach has been primarily applied to sparse matrix-vector products (SpMV) and explicit solvers. Previous studies by the author have proposed reordering techniques for applying CC-Overlapping to processes involving global data dependencies, such as the Conjugate Gradient method preconditioned by Incomplete Cholesky Factorization (ICCG). Successful implementations on massively parallel supercomputers demonstrated high parallel performance, but the application of CC-Overlapping was limited to SpMV. In the present work, the author proposes a method to apply CC-Overlapping to the forward and backward substitutions of the IC(0) smoother of the parallel Conjugate Gradient method preconditioned by Multigrid (MGCG). Using up to 4,096 nodes on Wisteria/EMEC-01 (Odyssey) with A64FX, performance improvement of approximately 40+% was achieved compared to the original implementation, while improvement was 20+% on 1,024 nodes of Oakbridge-CX system with Intel Xeon CPU's.

关键词： parallel Computing Iterative Solvers Multigrid Manycore Communication-Computation Overlapping

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A Scalable parallel Partition Tridiagonal Solver for Many-Core and Low B/F Processors 36

A Scalable Parallel Partition Tridiagonal Solver for Many-Co...

引用

36th IEEE international parallel and distributed Processing symposium (IEEE IPDPS)

作者： Mitsuda, Tatsuya Ono, Kenji Kyushu Univ Grad Sch Fukuoka Japan Kyushu Univ Fac Informat Sci & Elect Engn Fukuoka Japan Kyushu Univ Res Inst Informat & Technol Fukuoka Japan

ISBN: (纸本)9781665497473

Tridiagonal systems are among the most fundamental computations in science, engineering, and mathematics, and one solver used in such systems is Tree Partitioning Reduction (TPR), which is a divide-and-conquer method that solves large-scale linear equations by dividing them and then computing the parts in parallel within different local memory threads. Herein, we propose an improved TPR algorithm that has a parallel cyclic reduction flavor, with which we reduced the number of algorithm steps by approximately half while simultaneously increasing arithmetic intensity and cache reusability. A performance evaluation conducted on an Intel Skylake-SP microprocessor showed a high hit ratio for the L1 cache and that our solver was as much as 31 times faster on 32 threads for 262144 equations. In the case of a Nvidia Tesla P100 GPU, our method processed 10 MRow/s more than TPR and cuSPARSE.

关键词： Tridiagonal system GPU parallel computing Multi/many-core

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parallel Optimization for Robotics: An Undergraduate Introduction to GPU parallel Programming and Numerical Optimization Research

Parallel Optimization for Robotics: An Undergraduate Introdu...

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1st international Conference on Smart Energy systems and Artificial Intelligence (SESAI)

作者： Plancher, Brian Columbia Univ Barnard Coll New York NY 10027 USA

ISBN: (纸本)9798350364613;9798350364606

While parallel programming, particularly on graphics processing units (GPUs), and numerical optimization hold immense potential to tackle real-world computational challenges across disciplines, their inherent complexity and technical demands often act as daunting barriers to entry. This, unfortunately, limits accessibility and diversity within these crucial areas of computer science. To combat this challenge and ignite excitement among undergraduate learners, we developed an application-driven course, harnessing robotics as a lens to demystify the intricacies of these topics making them tangible and engaging. Our course's prerequisites are limited to the required undergraduate introductory core curriculum, opening doors for a wider range of students. Our course also features a large final-project component to connect theoretical learning to applied practice. In our first offering of the course we attracted 27 students without prior experience in these topics and found that an overwhelming majority of the students fell that they learned both technical and soft skills such that they felt prepared for future study in these fields.

关键词： CS Education GPU Programming Numerical Optimization parallel Computing Robotics Undergraduate Education

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