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Optimization Methods for computing System in Mobile CPS 19

Optimization Methods for Computing System in Mobile CPS

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2nd international conference on Big Data Technologies (ICBDT) / 3rd international conference on Business Information Systems Workshop (ICBIS)

作者： Zhang, Yang Xing, Zuocheng Wang, Yu Chen, Lirui Wang, Qinglin Zhu, Yufei Natl Univ Def Technol Natl Lab Parallel & Distributed Proc Changsha Peoples R China

ISBN: (纸本)9781450371926

In Mobile Cyber-physical system (CPS) is a popular research field in recent years. It aims to control and monitor mobile devices in complex and real-time scenes, and provide people with convenience and economy by using intelligent applications. The scenes in mobile CPS have close relationships with everyone's life and it has pervasive effect on people's life anytime and anywhere. In the paper, we focus on the intelligent transportation systems (ITS) in mobile CPS. Specifically, we analyse the bottlenecks in automated and autonomous vehicles and find the on-car computer is the key component for low latency and low power self-driving vehicles. We show detailed research developments on the most advanced CPU-GPU platform including four aspects, mainly putting focus on the methods to reduce latency and energy in the system. The four aspects cover reducing data transferring overhead, reducing power consumption with power-gating, optimizing warp scheduling scheme and optimizing cache performance in coprocessors. Finally, we give the prospects and development trends in the computing platform of self-driving on-car system.

关键词： CPS Intelligent Transportation Systems CPU-GPU platform

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Stochastic Floyd-Steinberg dithering on GPU: image quality and processing time improved 5

Stochastic Floyd-Steinberg dithering on GPU: image quality a...

引用

5th international conference on Image Information Processing (ICIIP)

作者： Franchini, Giorgia Cavicchioli, Roberto Hu, Jia Cheng Univ Modena & Reggio Emilia Modena Italy

ISBN: (纸本)9781728108995

Error diffusion dithering is a technique that is used to represent a grey-scale image in a format usable by a printer. At every step, an algorithm converts the grey-scale value of a pixel to a new value within the allowed ones, generating a conversion error. To achieve the effect of continuous-tone illusion, the error is distributed to the neighboring pixels. Among the existent algorithms, the most commonly used is Floyd-Steinberg. However, this algorithm suffers two issues: artifacts and slowness. Regarding artifacts, those are textures that can appear after the image elaboration, making it visually different from the original one. In order to avoid this effect, we will use a stochastic version of Floyd-Steinberg algorithm. To evaluate the results, we will apply the Weighted Signal to Noise Ratio (WSNR), a visualbased model to account for perceptivity of dithered textures. This filter has a low-pass characteristic and, in particular, it uses a Contrast Sensitivity Function to evaluate the similarity between the original image and the final image. Our claim is that the new stochastic algorithm is better suited for both the WSNR measure and the visual analysis. Secondly, we will face slowness: we will describe a parallel version of Floyd-Steinberg algorithm that will exploit GPU (Graphics Processing Unit), drastically reducing the spent time. Specifically, we noticed that the serial version computational time increases quadratically with the input size, while the parallel version one increases linearly. Both the image quality and the computational performance of the parallel algorithm are evaluated on several large-scale images.

关键词： Dithering Half-tone parallel computing GPGPU Floyd and Steinberg Stochastic Dithering

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Image retargeting using dynamic load balancing-based parallel architecture

Image retargeting using dynamic load balancing-based paralle...

引用

international conference on Soft computing and Signal Processing, ICSCSP 2018

作者： Patil, Ganesh V. Deshpande, Santosh L. Vishveshwaraya Technical University Belgaum BelgaumKarnataka India

ISBN: (纸本)9789811333927

Nowadays, enormously expanding use of mobile gadgets for capturing images is getting overwhelming response. This fact results in a tremendously increasing usage of digital images. To maintain the quality of vastly pervading digital images on variable sized display contraptions becomes a pensive task for a Web administrator. We are providing a three-leveled image retargeting approach on a parallel architecture with ranking-based dynamic load balancing (RBDLB). Image retargeting is both computational and memory intensive task. Static load balancing cannot offer equity to image retargeting errand as incoming image jobs are required to be processed at dynamic time. The motive of thought process of this undertaking is to provide a good response time and efficient resource utilization in a task of image retargeting without compromising quality of image. © Springer Nature Singapore Pte Ltd. 2019.

关键词： parallel architectures

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Research and Implementation of Electric Marketing and Distribution Data Fusion Technology Based on Graph Database

Research and Implementation of Electric Marketing and Distri...

引用

advances in Electrical Engineering and Computer Applications( AEECA), 2020 IEEE international conference on

作者： Junfeng Qiao Aihua Zhou Hongbin Qiu Artificial Intelligence on Electric Power System State Grid Corporation Joint Laboratory Global Energy Interconnection Research Institute co.Ltd. Nanjing China

ISBN: (数字)9781728165219

ISBN: (纸本)9781728165226

The data connection of electric power marketing and distribution network is an integrated platform of operation and distribution data based on geographic information platform, which integrates the data of marketing business application system, production management information system and grid geospatial information service platform, and shares the whole face of production data and marketing customer data, so as to achieve the connection of operation and distribution data and business, and realize fault location and electric failure Scope analysis, line loss statistics, business expansion and installation, etc. Graph database has the technical advantages of high efficiency of topological data organization, low redundancy of topological data storage, strong expansibility of topological data model and high efficiency of topological analysis and calculation, which can meet the storage, query and retrieval requirements of large-scale operation and distribution data. After application verification, the results show that the graph database can provide data storage, query and retrieval technology scheme for the operation and distribution of power grid. With the business development of operation and distribution of power grid, there are performance bottlenecks in the existing data storage mode, which seriously restricts the deepening of application. It is necessary to introduce advanced computing technology to achieve breakthrough, and improve the data storage efficiency of the existing data platform The parallel and concurrent ability of data retrieval and query can meet the management requirements of geometric growth of power grid equipment, the analysis requirements of real-time data of power grid, and the concurrent access requirements of largescale growth of users.

关键词： Topology Power grids Business Data analysis distributed databases

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Win with What You Have: QoS-Consistent Edge Services with Unreliable and Dynamic Resources

Win with What You Have: QoS-Consistent Edge Services with Un...

引用

international conference on distributed computing Systems

作者： Zheng Song Eli Tilevich Software Innovations Lab Virginia Tech

ISBN: (数字)9781728170022

ISBN: (纸本)9781728170039

Mobile and energy harvesting devices increasingly provide resources for edge environments. These devices' mobility and limited energy budgets may cause failures and poor performance. The reliability and efficiency of edge services can be improved with equivalent microservices that satisfy application requirements by different means: execute equivalent microservices in the predefined patterns of fail-over to minimize execution costs or speculative parallelism to reduce latency. However, given the vast dissimilarities in resource availability and capability across edge environments, being limited to these predefined patterns when implementing edge services causes inconsistent QoS. To address this problem, we provide QoS-consistent edge services by customizing the execution of equivalent microservices. Our system estimates the environment-specific QoS of equivalent microservices and dynamically generates execution strategies that best satisfy given QoS requirements. We evaluate the effectiveness and performance of our system via simulations and benchmarks with realistic edge deployments. Our approach consistently out-performs the predefined execution patterns in satisfying the QoS requirements in unreliable and dynamic edge environments.

关键词： Performance evaluation Feedback loop Scalability Quality of service parallel processing Dynamic scheduling Reliability engineering

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Scalable Work-Stealing Load-Balancer for HPC distributed Memory Systems 24th

Scalable Work-Stealing Load-Balancer for HPC Distributed Mem...

引用

international European conference on parallel and distributed computing (Euro-Par)

作者： Fontenaille, Clement Petit, Eric Castro, Pablo de Oliveira Uemura, Seijilo Sohier, Devan Lesnicki, Piotr Lartigue, Ghislain Moureau, Vincent Univ Versailles Li PaRAD Versailles France Atos Bull Paris France Intel Corp Santa Clara CA USA Univ Normandie CNRS CORIA St Etienne Du Rouvray France

ISBN: (纸本)9783030105495;9783030105488

Work-stealing schedulers are common in shared memory environments. However, large scale distributed memory usage has been limited to specific ad-hoc implementations preventing a broader adoption. In this paper we introduce a new scalable work-stealing algorithm for distributed memory systems as well as our implementation as the TITUS DLB library. It is based on Kleinberg's small-world graph. It allows to control the communication patterns and associated runtime overheads while providing efficient heuristics for victim selection and results routing. To validate our approach, we present the DLB Bench benchmark which emulates arbitrary workload distribution and imbalance characteristics. Finally, we compare TITUS DLB to the ad-hoc solution developed for the YALES2 computational fluid dynamics and combustion solver. We achieve up to 54% performance gain over thousands of cores.

关键词： Computational fluid dynamics

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Efficient Post-quantum Identity-based Encryption with Equality Test

Efficient Post-quantum Identity-based Encryption with Equali...

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international conference on parallel and distributed Systems (ICPADS)

作者： Willy Susilo Dung Hoang Duong Huy Quoc Le Institute of Cybersecurity and Cryptology School of Computing and Information Technology University of Wollongong Wollongong NSW Australia

ISBN: (数字)9781728190747

ISBN: (纸本)9781728183824

Public key encryption with equality test (PKEET) enables the testing whether two ciphertexts encrypt the same message. Identity-based encryption with equality test (IBEET) simplify the certificate management of PKEET, which leads to many potential applications such as in smart city applications or Wireless Body Area Networks. Lee et al. (ePrint 2016) proposed a generic construction of IBEET scheme in the standard model utilising a 3-level hierachy IBE together with a one-time signature scheme, which can be instantiated in lattice setting. Duong et al. (ProvSec 2019) proposed the first direct construction of IBEET in standard model from lattices. However, their scheme achieve CPA security only. In this paper, we improve the Duong et al.'s construction by proposing an IBEET in standard model which achieves CCA2 security and with smaller ciphertext and public key size.

关键词： Wireless communication Identity-based encryption Smart cities Public key Lattices Standards Testing

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Multi-Container Application Migration with Load Balanced and Adaptive parallel TCP

Multi-Container Application Migration with Load Balanced and...

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2019 international conference on High Performance computing and Simulation, HPCS 2019

作者： Thongthavorn, Wongsatorn Rattanatamrong, Prapaporn Thammasat University Department of Computer Science Phatumthani Thailand

ISBN: (纸本)9781728144849

Application migration in Wide Area Network (WAN) is needed in many scenarios: disaster recovery and service hand-off in edge cloud. Modern distributed applications are virtualized with multiple virtual machines or containers. This paper focuses on parallel multi-container migration in WAN environments by utilizing multiple TCP connections over a single direct path (a.k.a parallel TCP). Our application migration middleware framework utilizes a feedback controller to determine a proper number of parallel container migration (i.e., parallel window) based on changing network bandwidth. Then a middleware's scheduler selects migration requests for the parallel window to load balance multiple pairs of hosts. The goal of our migration is to achieve the best possible balance between optimizing the total migration time and average individual migration time. This differs from most existing live migration works that attempt to optimize mainly the down time. Our proposed framework is generalized and not restricted to any particular virtualization technology implementation. For performance evaluation, we conducted a WAN-emulated experiment in static and dynamic network settings. The performance evaluation results show that the total migration time using our feedback controller is less than that of the sequential migration by 32.7% in the static network, and 43.9% in the dynamic network. Moreover, while achieving total migration time comparable to that of the best fixed parallel migration window, our approach can reduce the average individual migration time by 62.7% in the dynamic network setting. © 2019 IEEE.

关键词： Containers

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Towards parallel verification of concurrent systems using the Symbolic Observation Graph 19

Towards parallel verification of concurrent systems using th...

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19th international conference on Application of Concurrency to System Design (ACSD)

作者： Ouni, Hiba Klai, Kais Abid, Chiheb Ameur Zouari, Belhassen Univ Tunis El Manar Fac Sci Tunis Tunis 2092 Tunisia Univ Paris 13 Sorbonne Paris Cite UMR LIPN 7030 CNRS Paris France Univ Carthage Mediatron Lab Higher Sch Commun Tunis Carthage Tunisia

ISBN: (纸本)9781728138435

An efficient way to cope with the combinatorial explosion problem induced by the model checking process is to compute the Symbolic Observation Graph (SOG). Given a stutter-invariant event-based LTL formula phi, involving a subset of actions (called observable actions), the SOG is a condensed representation of the state space graph based on a symbolic encoding of the nodes (sets of states linked with unobservable actions) and an explicit representation of the edges (labelled with observable actions). It has the advantage to be much reduced comparing to the original state space graph while being equivalent with respect to stutter-invariant temporal properties (i.e., the original system satisfies phi if and only if the corresponding SOG satisfies phi). Aiming to go further in the process of tackling the state space explosion problem, we propose in this paper to parallelize the construction of the SOG using a hybrid approach (distributed+shared memory). Doing so, we take advantage of the recent advances in computer hardware, by distributing the construction process over a large number of multi-core processors. We studied the performances of our new approach comparing to both distributed and shared memory approaches on one side, and to the sequential construction on the other side. The obtained results show that the proposed approach offers an interesting alternative allowing to completely exploit the available distributed architecture while offering significant speedup.

关键词： Model checking Aggregates Partitioning algorithms Explosions Message passing Memory architecture

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Optimizing Breadth-First Search at Scale Using Hardware-Accelerated Space Consistency 26

Optimizing Breadth-First Search at Scale Using Hardware-Acce...

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26th international conference on High Performance computing, Data and Analytics (HiPCW)

作者： Ibrahim, Khaled Z. Lawrence Berkeley Natl Lab Computat Res Div Berkeley CA 94720 USA

ISBN: (纸本)9781728145358

Graph traversal is a critical building block in many algorithms. Traversing a large graph using breadth-first search, although conceptually simple, is time-consuming in distributed-memory environments due to the amount of exchanged data. In this work, we present both an efficient algorithmic approach to carry out the traversal and a low-overhead runtime that provides efficient primitives to implement the algorithm. Our algorithm relies on constructing a traversal composed of partially consistent trees until all vertices are discovered. We resolve such inconsistency through election and exchange steps. The election phase relies on communicating compressed vertices through collectives that do not stress the bisection bandwidth of the interconnect. We leverage the space consistency programming abstraction to allow an efficient overlap of computation with communication. We extend the model to leverage hardware accelerated collectives and provide primitives for one-sided broadcast and sparse reduction. We present the algorithm and runtime designs and show the results of applying our techniques on the Bluegene/Q architectures. We achieve 1040 GTEPS on a single rack (1K nodes), which is better than the best-known algorithms on the same architecture. We also achieve superior scalability compared with other implementations up to 32K nodes.

关键词： Breadth-first Search Hardware Accelerated Collective distributed Memory Programming Models

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