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Reconfigurable sequential consistency algorithm

Reconfigurable sequential consistency algorithm

引用

19th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2005

作者： Pousa, Christiane V. Góes, Luís F. W. Da Penha, Dulcinéia O. Martins, Carlos A. P. S. Graduation Program in Electrical Engineering Computational and Digital Systems Group Pontifical Catholic University of Minas Gerais Belo Horizonte - Minas Gerais Brazil

ISBN: (纸本)0769523129

In this paper, we propose, implement and analyze the performance of a Reconfigurable Sequential Consistency Algorithm (RSCA) using simulation. Extending the concepts of reconfigurable devices to the algorithmic level, we model RSCA that is a reconfigurable sequential consistency algorithm for asynchronous distributed systems that manage concurrent objects stating. As our main results, we present that, on average, the performance of RSCA was 36% better than the traditional sequential consistency algorithms. The main contributions of this paper are: the definition, proposal, implementation and performance analysis of RSCA.

关键词： Distributed computer systems

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Reconfigurable object consistency model

Reconfigurable object consistency model

引用

19th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2005

作者： Pousa, Christiane V. Góes, Luís F. W. Martins, Carlos A. P. S. Graduation Program in Electrical Engineering Computational and Digital Systems Group Pontifical Catholic University of Minas Gerais Belo Horizonte - Minas Gerais Brazil

ISBN: (纸本)0769523129

Consistency is an important issue in Distributed Shared Memory (DSM) systems. These systems share a set of objects or virtual memory pages. The data sharing enables the applications in workloads to access the data concurrently. But, these concurrent accesses can generate some inconsistencies in the shared data state. The consistency models are responsible for managing consistency of shared data for the workloads. In this work, we propose, present and analyze a reconfigurable consistency model for object based DSMs. We called this consistency model ROCoM (Reconfigurable Object Consistency Model). ROCoM behavior was represented using a reconfigurable algorithm (RA) and it analysis was made using a simulation tool (ClusterSim - Cluster Simulation Tool). Our results show that ROCoM, on average, had 55% better performance than the other traditional consistency models.

关键词： Distributed computer systems

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Reconfigurable consistency model for object-based software DSM

Reconfigurable consistency model for object-based software D...

引用

2005 IEEE International Symposium on Cluster Computing and the Grid, CCGrid 2005

ISBN: (纸本)0780390741

Distributed Shared Memory (DSM) systems can share a set of objects or virtual memory pages. The data sharing enables the applications to access the data concurrently. But, these concurrently access can generate some inconsistencies in the shared data state. The consistency models are responsible for managing the state of shared data for the applications. The already proposed consistency models are inflexible and cannot adapt to the workload and architectures characteristics. So, they cannot generate the best performance for the workloads and architectures in all the cases. In this work, we propose, present and analyze a reconfigurable consistency model for object based DSMs. We called this consistency model ROCoM (Reconfigurable Object Consistency Model). ROCoM behavior was represented using a reconfigurable algorithm (RA) and its analysis was made using a simulation tool. Our results show that ROCoM, on average, had 30% better performance than others consistency models. © 2005 IEEE.

关键词： Distributed computer systems

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Reconfigurable Gang Scheduling Algorithm

Reconfigurable Gang Scheduling Algorithm

引用

10th International Workshop on Job Scheduling Strategies for Parallel Processing, JSSPP 2004

作者： Góes, Luís Fabrício Wanderley Da Silva Martins, Carlos Augusto Paiva Pontifical Catholic University of Minas Gerais Post-Graduation Program in Electrical Engineering Av. Dom José Gaspar 500 Belo Horizonte Minas Gerais Brazil

Using a single traditional gang scheduling algorithm cannot provide the best performance for all workloads and parallel architectures. A solution for this problem is an algorithm that is capable of dynamically changing its form (configuration) into a more appropriate one, according to environment variations and user requirements. In this paper, we propose, implement and analyze the performance of a Reconfigurable Gang Scheduling Algorithm (RGSA) using simulation. A RGSA uses combinations of independent features that are often implemented in GSAs such as: packing and re-packing schemes (alternative scheduling etc.), multiprogramming levels etc. Ideally, the algorithm may assume infinite configurations and it reconfigures itself according to entry parameters such as: performance metrics (mean utilization, mean response time of jobs etc.) and workload characteristics (mean execution time of jobs, mean parallelism degree of jobs etc.). Also ideally, a reconfiguration causes the algorithm to output the best configuration for a particular situation considering the system's state at a given moment. The main contributions of this paper are: the definition, proposal, implementation and performance analysis of RGSA. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Parallel processing systems

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Reconfigurable consistency algorithm

Reconfigurable consistency algorithm

引用

International Conference on High Performance Computing in the Asia-Pacific Region

作者： C.V. Pousa L.F.W. Goes C.A.P.S. Martins Graduation Program in Electrical Engineering Computational and Digital Systems Group Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil

In this paper, we propose, present and analyze the behavior and the performance of a reconfigurable algorithm for shared objects consistency management in distributed systems. Object sharing allows nodes to concurrently/parallel access a same set of replicated objects. However, it is necessary that the nodes know when and how to do these accesses, avoiding inconsistencies in the objects state. The RCA (reconfigurable consistency algorithm) is a reconfigurable algorithm that guarantees the objects consistency. This algorithm modifies its behavior and structure according to the changes in the workload and distributed systems parameters. The paper shows that: the use of RCA generates flexibility and improves the performance in 30%, on average

关键词： Performance analysis Access protocols Analytical models Contracts Computer architecture Proposals computational modeling Algorithm design and analysis Hardware Coherence

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Development of a low intensity magnetic field transducer for biomedical application based on the Giant Magnetoimpedance effect

Development of a low intensity magnetic field transducer for...

引用

International Measurement Federation, IMEKO - Symposium on Metrology and Measurement Applications in the Era of Internet Working 2005

作者： Pompéia, Flávia Gusmão, Luiz A.P. Barbosa, Carlos H. Monteiro, Elisabeth C. Gonsalves, Lídice A.P. MacHado, Fernando L.A. Post Graduation Program in Metrology Pontifícia Universidade Católica Do Rio de Janeiro PUC-Rio 22453-900 Rio de Janeiro Brazil Department of Electrical Engineering PUC-Rio Rio de Janeiro Brazil Department of Physics UFPE Recife Brazil Department of Material Engineering Universidade Federal de Pernambuco UFPE Recife Brazil

ISBN: (纸本)9781622766970

This manuscript presents the development of a low intensity magnetic field transducer, based on the Giant Magnetoimpedance (GMI) effect, to be used for biomedical applications. The GMI effect is a characteristic of some ferromagnetic materials, due to which it is observed a large variation of the material impedance due to external dc magnetic fields. We describe the effect, the transducer configuration, the electronic circuits and the preliminary results obtained so far. A sensitivity comparable to a fluxgate probe has already been obtained, and the theoretical calculations indicate the possibility of further enhancing this figure of merit.

关键词： Ferromagnetic materials

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RJSSim: A reconfigurable job scheduling simulator for parallel processing learning 33

RJSSim: A reconfigurable job scheduling simulator for parall...

引用

33rd Annual Frontiers in Education, FIE 2003

作者： Góes, Luís F.W. Martins, Carlos A.P.S. Pontifical Catholic University of Minas Gerais Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil Pontifical Catholic University of Minas Gerais Computer Science Department Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil

ISBN: (纸本)0780379616

In this work, we present and analyze the use of a reconfigurable job scheduling simulator called RJSSim as an aid tool for parallel processing learning. This software is a functional and performance Java-based simulator of job scheduling policies. Our objectives are: to present RJSSim;to show the use of RJSSim and reconfigurability concepts for parallel processing learning. First, we present a prototype of RJSSim and the reconfigurability concept. Then we describe two case studies remarking the main parallel processing concepts and skills students can learn. In the first case study, we analyze two parallel algorithm models. In the second, we do some performance tests among parallel (reconfigurable) scheduling policies and architectures. Then, we analyze the performance through some metrics like response time, idle time etc. Finally we discuss and analyze the use of RJSSim for parallel processing learning. Our main contribution is: an implementation of RJSSim for parallel processing learning. © 2003 IEEE.

关键词： Parallel algorithms

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Performance analysis of parallel programs using prober as a single aid tool 14

Performance analysis of parallel programs using prober as a ...

引用

14th Symposium on Computer Architecture and High Performance Computing

作者： Góes, LFW Ramos, LES Martins, CAPS Informatics Institute Post-Graduation Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Brazil

ISBN: (纸本)0769517722

Prober is a functional and performance analysis tool for parallel programs, developed during an undergraduate research project. In this paper we show the new expanded version of Prober, in which some features from different software tools are aggregated. It can be used as a single tool to aid the developer in the performance analysis of parallel programs. Our main goal is to provide a new version of Prober, with additional features. Among them we can highlight: the interpretation of user scripts, a user-level support library the generation of speedup and efficiency graphics, batch execution and a new user interface. In order to show, verify and analyze the use of the new version of Prober, we did performance tests in a parallel image convolution program. We added performance measuring routines to collect performance data within different internal code segments;built a set of scripts to specify the performance tests;ran the set of scripts in batch mode;used Prober to generate graphics and statistics based on the collected performance data;and analyzed the results rising Prober as an aid tool.

关键词： Convolution Graphics Image analysis Image segmentation Performance analysis Radio access networks Software libraries Software tools Testing User interfaces

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Performance analysis of parallel programs using Prober as a single aid tool

Performance analysis of parallel programs using Prober as a ...

引用

International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD)

作者： L.F.W. Goes L.E.S. Ramos C.A.P.S. Martins Informatics Institute Post-Graduation Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Brazil

Prober is a functional and performance analysis tool for parallel programs, developed during an undergraduate research project. In this paper we show the new expanded version of Prober, in which some features from different software tools are aggregated. It can be used as a single tool to aid the developer in the performance analysis of parallel programs. Our main goal is to provide a new version of Prober, with additional features. Among them we can highlight: the interpretation of user scripts, a user-level support library, the generation of speedup and efficiency graphics, batch execution and a new user interface. In order to show, verify and analyze the use of the new version of Prober, we did performance tests in a parallel image convolution program. We added performance measuring routines to collect performance data within different internal code segments; built a set of scripts to specify the performance tests; ran the set of scripts in batch mode; used Prober to generate graphics and statistics based on the collected performance data; and analyzed the results using Prober as an aid tool.

关键词： Performance analysis Graphics Testing Software tools Software libraries User interfaces Image analysis Convolution Image segmentation Radio access networks

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Simulation tool of network processor for learning activities

Simulation tool of network processor for learning activities

引用

Frontiers in Education (FIE) Conference

作者： H.C. de Freitas C.A.P. da Silva Martins Post-Graduation Program in Electrical Engineering Student Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil Post-Graduation Program in Electrical Engineering Professor Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil

We present a functional simulation tool of the network processor developed at the Pontifical Catholic University of Minas Gerais, Brazil. It started during an undergraduate research project. The instruction set and microarchitecture of this type of processor are specialized and dedicated to work in network layers. Our main goals are improving and optimizing the learning activities related to the network processor for engineering and computer science users.

关键词： Microarchitecture Computer networks Computer aided instruction Logic Buffer storage Read-write memory Computer architecture Registers Switches Reduced instruction set computing

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