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检索条件"主题词=Scheduling algorithm"

共 10726 条记录，以下是151-160 订阅

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DDS: A Deadline Driven Workflow scheduling algorithm for Hybrid Amazon Instances 9th

DDS: A Deadline Driven Workflow Scheduling Algorithm for Hyb...

引用

9th Asia-Pacific Services Computing Conference (APSCC)

作者： Ma, Zitai Cao, Jian Qian, Shiyou Shanghai Jiao Tong Univ Shanghai 200030 Peoples R China

ISBN: (纸本)9783319269795;9783319269788

Workflows can orchestrate multiple applications that need resources to execute. The cloud computing has emerged as an on-demand resource provisioning paradigm, which can support workflow execution. In recent years, Amazon offers a new service option, i.e., EC2 spot instances, whose price is on average more than 75 % lower than the one of on-demand instances. Therefore, we can make use of spot instances to execute workflows in a cost-efficient way. However, the spot instances is cut off when their price increases and exceeds the customer's bid, which will make the task failed and the execution time becomes unpredictable. We propose a deadline driven scheduling (DDS) algorithm which is able to use both on-demand and spot instances to reduce the cost while the deadline of workflows can also be guaranteed with a high probability. Especially, we use an attribute, called global weight, to represent the interdependency relations of tasks and schedule the tasks whose interdependent tasks need longer time first to reduce the whole execution time. The experimental results demonstrate that DDS algorithm is effective in reducing cost while satisfying the deadline constraints of workflows.

关键词： Workflow scheduling algorithm Spot instance Cloud computing

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Adaptive scheduling algorithm for Real-Time Operating System

Adaptive Scheduling Algorithm for Real-Time Operating System

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IEEE Congress on Evolutionary Computation

作者： Kotecha, Ketan Shah, Apurva G H Patel Coll Engg & Tech Vallabh Vidyanagar 388120 Gujarat India

ISBN: (纸本)9781424418220

EDF (Earliest Deadline First) has been proved to be optimal scheduling algorithm for single processor real-time operating systems when the systems are preemptive and underloaded. The limitation of this algorithm is, its performance decreases exponentially when system becomes slightly overloaded. Authors have already proved ability of ACO (Ant Colony Optimization) based scheduling algorithm for real-time operating system which is optimal during underloaded condition and it gives outstanding results in overloaded condition. The limitation of this algorithm is, it takes more time for execution compared to EDF algorithm. In this paper, an adaptive scheduling algorithm is proposed which is combination of both of these algorithms. Basically the new algorithm uses EDF algorithm but when the system becomes overloaded, it will switch to ACO based scheduling algorithm. Again, when the overload disappears, the system will switch to EDF algorithm. Therefore, the proposed algorithm takes the advantages of both algorithms and overcomes the limitations of each other. The proposed algorithm along with EDF algorithm and ACO based scheduling algorithm, is simulated for real-time system and the results are obtained. The performance is measured in terms of Success Ratio and Effective CPU Utilization. Execution Time taken by each scheduling algorithm is also measured. From analysis and experiments it reveals that the proposed algorithm is fast as well as very efficient in both underloaded and overloaded conditions.

关键词： Real-Time Operating Systems scheduling algorithm ACO algorithms EDF

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Toward Automatic scheduling algorithm with Hash-Based Priority Selection Strategy 8th

Toward Automatic Scheduling Algorithm with Hash-Based Priori...

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8th International Conference on Soft Computing for Problem Solving (SocProS)

作者： Ji, Xiaonan Ma, Kun Univ Jinan Shandong Prov Key Lab Network Based Intelligent C Jinan 250022 Peoples R China

ISBN: (纸本)9789811501845;9789811501838

Not only the organizations or groups but also the laboratory or the store is in demand of a system with automatic scheduling algorithm. Current automatic scheduling with computer is time consuming. With the goal to develop an innovative system which can increase the productivity, we finally design an advanced algorithm based on priority and hash map. It firstly provides a method called linear programming (LP) for the problem. Then, we interpret the similar backtracking approaches and compared with another two algorithms. We rebuild their process and design and propose a more efficient and simpler algorithm based on priority and hash. After the development of such a web system, it is proved to be a simple, efficient, and easy-implement method to solve the problem.

关键词： scheduling algorithm Duty table Priority selection strategy Duty management

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A Packet scheduling algorithm for IEEE 802.22 WRAN Systems and Calculation Reduction Method Thereof

A Packet Scheduling Algorithm for IEEE 802.22 WRAN Systems a...

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5th International Conference on Intelligent Computing

作者： Lee, Young-du Yun, Tae-joon Koo, Insoo Univ Ulsan Sch Elect Engn Ulsan 680749 South Korea

ISBN: (纸本)9783642040191

In the paper, a scheduling algorithm based on the estimation of packet loss amount is proposed for supporting real-time traffic in IEEE 802.22 WRAN systems. The proposed scheduling algorithm takes two steps for resource allocation. In the first step, it assigns resource to users having packets that are estimated to be dropped at next frame. In the second step, it assigns the remaining resource to the other users according to one of the existing scheduling algorithms. The simulation results show that the proposed scheduling algorithm provides Much better performance than the PLFS and M-LWDF algorithm. In addition, a simple calculation method is proposed for the proposed scheme. With the simple method, we can reduce the number of checking packets in the queue as much as about a half time without any performance degradation in the case of video traffic.

关键词： IEEE 802.22 WRAN scheduling algorithm Packet loss amount Calculation reduction method

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Improved scheduling algorithm In VCL Cloud Computing Environment On CloudSim 13

Improved Scheduling Algorithm In VCL Cloud Computing Environ...

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International Conference on High Performance Computing and Simulation (HPCS)

作者： Khedher, Omar Jarraya, Mohamed ENIT Innovcom Lab Tunis Tunisia Saudi Elect Univ Coll Computat & Informat Dammam Saudi Arabia

ISBN: (纸本)9781467378130

Cloud Computing has empowered the academic communities by reducing the IT infrastructure administration and cost. As one of several cloud computing solutions, Virtual Cloud Laboratory (VCL) has improved many universities experience by providing handon labs for each course per class. VCL has multiple deployment requirements. Although it represents a simplified architecture design, treating a large size VCL deployment might be challenging. In addition, putting the performance of resource allocation policies and different scheduling algorithms under scope could help to quantify the workload running in a real and expanded VCL environment. We aim through this study at identifying the limitations of the default scheduler in VCL and propose an enhanced scheduler. By simulating a VCL cloud computing environment, it might be possible to prove different scheduling algorithms and their impact from performance perspective.

关键词： Virtual Cloud Laboratory On Demand Resources scheduling algorithm CloudSim Performance Analysis

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Simulation Research on EDF scheduling algorithm of CAN Network Based on OPNET

Simulation Research on EDF Scheduling Algorithm of CAN Netwo...

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International Conference on Materials Science and Information Technology (MSIT 2011)

作者： Wu, Jiechang Hao, Jia Guo, Chaoyou Naval Univ Engn Dept Mech Engn Wuhan 430033 Peoples R China

ISBN: (纸本)9783037853191

In order to analyze and evaluate real-time performance of CAN network, the OPNET models of CAN network with Fixed Priority scheduling (FPS) and Earliest Deadline First (EDF) have been set up in this paper. Based on simulation experiments, the performances of average delay and transmission success ratio in the two models are analyzed and the experiments also indicate that under normal load condition the two scheduling algorithm both can send data frame successfully before the deadline. In a slight overload condition FPS algorithm makes the transmission delay of low priority data frame significantly increased, and even occurs the phenomenon that low priority data frame can not be sent at all times;while the EDF algorithm can make all the nodes to complete the data frames in less than 3ms transmission delay, it meets the delay requirements that are delay should less than 10ms in most control systems, it indicates that EDF algorithm has the better scheduling and availability in soft real-time system.

关键词： OPNET scheduling algorithm EDF FPS average delay transmission success ratio

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A new dynamic scheduling algorithm for real-time heterogeneous multiprocessor systems

A new dynamic scheduling algorithm for real-time heterogeneo...

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Workshop on Intelligent Information Technology Application (IITA 2007)

作者： Yang YuHai Yu Shengsheng Bin XueLian Huazhong Univ Sci & Technol Natl Storage Syst Lab Wuhan 430019 Hubei Peoples R China Airforce Army Radar Acad Dept Informat & Engn Wuhan 430019 Hubei Peoples R China

ISBN: (纸本)9780769530635

In this paper, we investigate several potential. processor selection policies for nonpreemptive scheduling of dynamically, arriving real-time tasks (aperiodic task) in heterogeneous multiprocessor systems, and the P_IEFT policy among them is the best from the viewpoint of the schedule length. The P_IEFT policy selects the processor that minimizes the earliest finish time of a task. Simulation results show that the new algorithm using the P_IEFT policy outperforms the other algorithms that use the other processor selection policies.

关键词： Dynamic scheduling Heuristic algorithms scheduling algorithm Real time systems Multiprocessing systems Processor scheduling Information technology Radar applications Polynomials Parallel processing

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Improvement and Application of Task scheduling algorithm for Embedded Real-Time Operating System 1st

Improvement and Application of Task Scheduling Algorithm for...

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World Conference on Intelligent and 3-D Technologies (WCI3DT)

作者： Yu, Jinze Lu, Xixiang Southwest Petr Univ Nanchong 637001 Sichuan Peoples R China

ISBN: (纸本)9789811971860;9789811971846;9789811971839

Operating system scheduling algorithm is the core of modern operating system to realize multi-task function. For battery-powered embedded devices, low-energy consumption is a key design index. The research on embedded low-energy consumption has broad application prospects and important application value, which has gradually attracted great attention from industry and academia. This paper studies the energy-saving scheduling problem of embedded systems. Aiming at the periodic tasks with strict execution time limit in embedded system, four energy-saving scheduling algorithms are proposed. For wireless sensor networks, a three-dimensional K virtual fence coverage energy-saving scheduling algorithm is proposed. Through theoretical analysis and specific experiments, this method reduces the missed rate of task deadline, improves CPU utilization, can schedule real-time tasks more effectively, and has been well applied in wireless broadband mobile computing. According to the real-time requirements of embedded operating system, this paper studies several classical real-time scheduling algorithms, and analyzes the specific principles, and advantages and disadvantages of each algorithm. On the premise that high priority tasks are executed first, tasks with high importance and not executed which can preempt the current task if and only when the margin is zero.

关键词： Wavelet transform Embedded real-time operation scheduling algorithm

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Downlink cyclic resources scheduling algorithm for industrial wireless M2M communicationn

Downlink cyclic resources scheduling algorithm for industria...

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3rd IFAC Conference on Embedded Systems, Computational Intelligence and Telematics in Control (CESCIT)

作者： Nunes, Gerson L. Roque, Alexandre S. Araujo, Sandro R. Pereira, Carlos E. Univ Fed Rio Grande do Sul Elect Engn Dept Porto Alegre RS Brazil

Due to the introduction of new M2M (Machine-to-Machine) functionalities and applications in the industry, new devices will need to be connected to existing communication networks, coexisting with current ones. The new mobile communication technologies, which are still in the standardization process, promise to comply with the communication requirements demanded by industrial automation systems. Therefore, this article has as main contribution to propose the development of a downlink scheduling algorithm for devices (sensors and actuators) that use periodic network resources. This algorithm will aim at reducing network signaling, increase data transmission capacity, or increase the number of devices operating in the industrial network. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Mobile networks M2M communication Industrial networks network simulator scheduling algorithm

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High-power short message delivery service via multiple non-GSO satellites: Its scheme and scheduling algorithm

High-power short message delivery service via multiple non-G...

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Joint Conference on Satellite Communications (JC-SAT)

作者： Konishi, S Shibuya, M Nomoto, S Kokusai Denshin Denwa Co Ltd Res & Dev Labs Kamifukuoka Saitama 3568502 Japan

Electronic mail (email) is one of the most popular services using Internet Protocol (IP). Emails are now sent to and from portable phones in addition to laptop computers. The volume of emails is increasing because of the recent addition of attached electronic files. In addition, short message delivery services (SMS) that send email header information and the essence of email contents are also commonly used. Global short message delivery services via satellites are considered attractive for meeting the demand of increased short message delivery services. To establish a communications link for indoor subscribers, it is preferable to concentrate high transmission power into a spot-beam even using a non-geostationary satellite orbit (non-GSO) satellite system with low Earth orbits. The idea can be realized by a kind of TDMA scheme where only a single spot-beam per satellite is fired at a timeslot in an efficiently scheduled manner. This paper proposes a global short message delivery scheme and a scheduling algorithm that enables each satellite to concentrate its power into a spot-beam illuminating the addressed area in a prescribed timeslot, so that a subscriber in the area can efficiently receive a message addressed to the subscriber. Since the algorithm must guarantee that the spot-beam assignment causes no interference with other spot-beams from adjacent satellites, numerical evaluations are given for a 6-hour period MEO system, as an example, to demonstrate the efficacy and performance.

关键词： non-GSO LEO/MEO SMS scheduling algorithm

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