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检索条件"任意字段=17th Workshop on Parallel and Distributed Simulation"

共 282 条记录，以下是11-20 订阅

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Improving simulations of Task-Based Applications on Complex NUMA Architectures 19th

Improving Simulations of Task-Based Applications on Complex ...

引用

19th International workshop on OpenMP (IWOMP)

作者： Daoudi, Idriss Gautier, thierry thibault, Samuel Perarnau, Swann Argonne Natl Lab Lemont IL 60439 USA ENS Lyon LIP INRIA Grenoble Lyon France Univ Bordeaux INRIA Bordeaux Bordeaux France

ISBN: (纸本)9783031407437;9783031407444

Modeling and simulation are crucial in high-performance computing (HPC), with numerous frameworks developed for distributed computing infrastructures and their applications. Despite node-level simulation of shared-memory systems and task-based parallel applications, existing works overlook non-uniform memory access (NUMA) effects, a critical characteristic of current HPC platforms. In this work, we introduce a modeling for complex NUMA architectures and enhance a simulator for dependency-based task-parallel applications. this facilitates experiments with varied data locality models: we refine a communication-oriented model leveraging topology information for data transfers, and devise a more intricate model incorporating a cache mechanism for last-level cache data storage. Dense linear algebra test cases are used to validate both models, demonstrating that our simulator reliably predicts execution time with minimal relative error.

关键词： NUMA architectures Modeling OpenMP tasks simulation

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Probabilistic Resources Allocation with Group Dependencies in distributed Computing 17th

Probabilistic Resources Allocation with Group Dependencies i...

引用

parallel Computing Technologies - 17th International Conference, PaCT 2023, Proceedings

作者： Toporkov, Victor Yemelyanov, Dmitry Bulkhak, Artem National Research University "MPEI" Moscow Russia

ISBN: (纸本)9783031416729

In this work, we introduce and study a set of tree-based algorithms for resources allocation considering group dependencies between their parameters. Real world distributed and high-performance computing systems often operate under conditions of the resources availability uncertainty caused by uncertainties of jobs execution, inaccuracies in runtime predictions and other global and local utilization events. In this way we can observe an availability over time function for each resource and use it as a scheduling parameter. As a single parallel job usually occupies a set of resources, they shape groups with common probabilities of usage and release events. the novelty of the proposed approach is an efficient algorithm considering groupings of resources by the common availability probability for the resources’ co-allocation. the proposed algorithm combines dynamic programming and greedy methods for the probability-based multiplicative knapsack problem with a tree-based branch and bounds approach. simulation results and analysis are provided to compare different approaches, including greedy and brute force solution. © 2023, the Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Resource allocation

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On the Routing Convergence Delay in the Lightning Network 17th

On the Routing Convergence Delay in the Lightning Network

引用

17th International workshops on Data Privacy Management, DPM 2022 and 6th International workshop on Cryptocurrencies and Blockchain Technology, CBT 2022, held in conjunction with the 27th European Symposium on Research in Computer Security, ESORICS 2022

作者： Gögge, Niklas Rohrer, Elias Tschorsch, Florian Distributed Security Infrastructures Technical University of Berlin Berlin Germany

ISBN: (纸本)9783031257339

Nodes in the Lightning Network synchronise routing information through a gossip protocol that makes use of a staggered broadcast mechanism. In this work, we show that the convergence delay in the network is larger than what would be expected from the protocol’s specification and that payment attempt failures caused by the delay are more frequent, the larger the delay is. To this end, we measure the convergence delay incurred in the network and analyse what its primary causes are. Moreover, we further investigate and confirm our findings through a time-discrete simulation of the Lightning Network gossip protocol. We explore the use of alternative gossip protocols as well as parameter variations of the current protocol and evaluate them by the resulting bandwidth usage and convergence delay. Our research shows that there are multiple ways of lowering the convergence delay, ranging from simple parameter changes to overhauling the entire protocol. © 2023, the Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Network routing

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Automated Verification of Idempotence for Stateful Serverless Applications 17

Automated Verification of Idempotence for Stateful Serverles...

引用

17th USENIX Symposium on Operating Systems Design and Implementation (OSDI)

作者： Ding, Haoran Wang, Zhaoguo Shen, Zhuohao Chen, Rong Chen, Haibo Shanghai Jiao Tong Univ Inst Parallel & Distributed Syst SEIEE Shanghai Peoples R China Shanghai AI Lab Shanghai Peoples R China

ISBN: (纸本)9781939133342

Serverless computing has become a popular cloud computing paradigm. By default, when a serverless function fails, the serverless platform re-executes the function to tolerate the failure. However, such a retry-based approach requires functions to be idempotent, which means that functions should expose the same behavior regardless of retries. this requirement is challenging for developers, especially when functions are stateful. Failures may cause functions to repeatedly read and update shared states, potentially corrupting data consistency. this paper presents Flux, the first toolkit that automatically verifies the idempotence of serverless applications. It proposes a new correctness definition, idempotence consistency, which stipulates that a serverless function's retry is transparent to users. To verify idempotence consistency, Flux defines a novel property, idempotence simulation, which decomposes the proof for a concurrent serverless application into the reasoning of individual functions. Furthermore, Flux extends existing verification techniques to realize automated reasoning, enabling Flux to identify idempotence-violating operations and fix them with existing log-based methods. We demonstrate the efficacy of Flux with 27 representative serverless applications. Flux has successfully identified previously unknown issues in 12 applications. Developers have confirmed 8 issues. Compared to state-of-the-art systems (namely Beldi and Boki) that log every operation, Flux achieves up to 6x lower latency and 10x higher peak throughput, as it logs only the identified idempotence-violating ones.

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PS-QMix: A parallel Learning Framework for Q-Mix Using Parameter Server 17th

PS-QMix: A Parallel Learning Framework for Q-Mix Using Param...

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17th International Conference on Advanced Data Mining Applications (ADMA)

作者： Liu, Xunyun Li, Xiang Li, Yuan Xiao, Boren Acad Mil Sci Beijing 100091 Peoples R China

ISBN: (纸本)9783030954055;9783030954048

With the development of deep reinforcement learning and multi-agent modeling, Multi-Agent Reinforcement Learning (MARL) has become a very active research topic recently. Q-Mix is a popular algorithm for solving MARL tasks where the individual agents are allowed to be trained in a centralized manner. As the scale and complexity of MARL tasks grow, there is an urging requirement for a more efficient training strategy. As a consequence, it is demanding to develop a Q-Mix training algorithm which can benefit from parallel computation. However, how classic distributed machine learning frameworks work with Q-Mix is a less studied problem. In this paper, we propose the PS-Qmix algorithm to apply the Parameter Server framework to training QMix agents in parallel. Our algorithm employs multiple distributed worker threads for data generation and model learning, where these two processes are decoupled and executed in alternation. To cater for different simulation speed of the environment, the proposed algorithm allows the user to tune the relative proportion of computation allocated to data generation and model learning. We evaluate the PS-Qmix algorithm on a StarCraft II micro-combat task. As we increase the number of worker threads, we observe significant speed-up in both data generation and model learning. the evaluation results indicate that our method is effective in utilizing distributed computation resources to train Q-Mix agents.

关键词： Multi-agent system Deep reinforcement learning distributed learning

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Aggregate Model of parallel distributed Energy Resources Controlled using Virtual Admittance

Aggregate Model of Parallel Distributed Energy Resources Con...

引用

Compatibility in Power Electronics (CPE)

作者： Dionysios Moutevelis Javier Roldán-Pérez Milan Prodanović

the increased number of distributed generation sources in distribution networks in recent years has emphasized the importance of their accurate and computationally efficient modelling. the development of efficient models becomes more difficult and complex with the introduction of novel controllers that aim to support the grid, often emulating the operation of passive circuit elements. One of such controllers has been recently proposed that emulates the operation of an admittance to support the voltage at the point of the converter grid connection. In this paper, an aggregate model of distributed energy resources controlled using virtual admittance approach and connected in parallel is derived. the resemblance of the controller to classical circuit elements is used to obtain an equivalent circuit for each converter including its controller part and the distribution line connecting it to the main grid. then, circuit analysis techniques are applied to synthesize the aggregate model of all the parallel converters in the network, simplifying the assessment of their combined effect on the rest of the network and reducing the computational burden. simulation results from Matlab and its SimPowerSystems toolbox are used to validate the accuracy of the proposed model.

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Boundary Sliding Mode Control of a Diffusion Process under Sampling and Hold: Chattering Analysis

Boundary Sliding Mode Control of a Diffusion Process under S...

引用

International workshop on Variable Structure Systems, VSS

作者： Paul Mayr Stefan Koch Markus Reichhartinger Alessandro Pisano Institute of Automation and Control Graz University of Technology Graz Austria Department of Electrical and Electronic Engineering University of Cagliari Cagliari Italy

ISBN: (数字)9798350353686

ISBN: (纸本)9798350353693

this paper investigates discretization chattering effects in a distributed-parameter process governed by the diffusion PDE and equipped with a sliding-mode-based boundary controller. the collocated measurement is sampled in time and the boundary control signal is applied through a zero-order-hold element. the limit cycle modes constituting the chattering effects are determined exactly by exploiting the difference equation method, yielding their period and spatially dependent amplitude. simulation results show that the theoretically determined limit cycle modes occur in the closed-loop system.

关键词： Variable structure systems simulation Difference equations Conferences Process control Limit-cycles Diffusion processes Time measurement Closed loop systems Sliding mode control

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Time-domain simulation and testing for dynamic force and stability prediction in milling: Collaboration with feed rate scheduling software 17th

Time-domain simulation and testing for dynamic force and sta...

引用

17th IFAC workshop on Time Delay Systems (TDS)

作者： Schmitz, Tony Nazario, Jose No, Timothy Gomez, Michael Corson, Greg Univ Tennessee Knoxville TN 37966 USA MSC Ind Supply Co Knoxville TN 37932 USA

this paper describes: 1) the use of feed rate scheduling software to predict the radial depth of cut variation for three-axis milling toolpaths and;2) the use of this radial depth profile in a time-domain simulation to predict dynamic cutting forces. the time-domain simulation, which also includes the tool tip frequency response functions and force model (which relates the cutting force components to the chip geometry) as inputs, enables dynamic force profiles to be predicted and parameter combinations that cause chatter to be identified. A ramp geometry is selected that provides constantly varying radial depth and force predictions are completed at multiple axial depths for comparison to measured *** (c) 2022 the Authors. this is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/)

关键词： Milling dynamics chatter simulation

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SABO: Dynamic MPI+OpenMP Resource Balancer 5

SABO: Dynamic MPI+OpenMP Resource Balancer

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5th IEEE/ACM Annual workshop on Emerging parallel and distributed Runtime Systems and Middleware, IPDRM 2022

作者： Barbosa, Cassandra Rocha Lemarinier, Pierre Papaure, Guillaume Perache, Marc Krajecki, Michael Atos Echirolles France University of Reims Champagne Ardennes Liciis Lrc Digit Reims France Cea Dam Dif and Cea Dam Dif Lrc Digit ArpajonF-91297 France Université Paris-Saclay Cea Laboratoire en Informatique Haute Performance Pour le Calcul et la Simulation Bruyéres le Châtel France

ISBN: (纸本)9781665475082

Scientific parallel applications often use MPI for inter-node communications and OpenMP for intra-node orches-tration. parallel applications such as particle transport, seismic wave propagation simulator, or Finite-Element applications often exhibit workload imbalance due to their nature of ongoing data movement. these applications usually develop software balancing strategies triggered when some imbalance thresholds are detected to reduce this imbalance. these developments are complex to implement and impact the entire distributed applications' performance by synchronizing and exchanging the load over the network. this paper proposes a method to dynamically detect load imbalance and balance the computation by redistributing OpenMP threads between MPI processes local to the node. With minimal impact on the applications' codes, we demonstrate how this technique can improve the overall applications' performance up to 28% on MiniFE, 17 % on Quicksilver, and 3 % on Ondes3D. We also present its impact when executing multiple nodes and our proposed approach's limitations. © 2022 IEEE.

关键词： Wave propagation

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17th IEEE International workshop on Automatic Performance Tuning (iWAPT2022)

Proceedings - 2022 IEEE 36th International Parallel and Dist...

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Proceedings - 2022 IEEE 36th International parallel and distributed Processing Symposium workshops, IPDPSW 2022 2022年 911-912页

作者： Lee, Che-Rung Ohshima, Satoshi National Tsing Hua University Taiwan Nagoya University Japan

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