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检索条件"机构=Computer Architecture and Operating Systems"

共 129 条记录，以下是11-20 订阅

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Extracting knowledge to predict tsp performance order

Extracting knowledge to predict tsp performance order

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2007 IADIS European Conference on Data Mining, DM 2007, part of the 1st IADIS Multi Conference on computer Science and Information systems, MCCSIS 2007

作者： Fritzsche, Paula Cecilia Rexachs, Dolores Luque, Emilio Computer Architecture and Operating Systems Department University Autonoma of Barcelona Spain

ISBN: (纸本)9789728924409

Parallel distributed architectures are essential for solving large-scale scientific and engineering problems. Its increasing use has generated the need for performance prediction for both deterministic applications and non-deterministic applications. The parallel performance prediction of data-dependent applications is an extremely challenging problem because for a specific issue the input data sets may cause variability in execution times. Some examples of this kind of applications are the sorting algorithms, the searching algorithms, the traveling salesman problem (TSP), and practical problems that can be formulated as TSP problems. The development of a new practical prediction methodology to estimate the execution time of data-dependent parallel applications is the primary target of this study. The entire methodology consists of several stages: the hypotheses formulation, the composition of experiments, the execution of the studied application, the knowledge discovery in databases (KDD) process, the understanding of the model, the quality evaluation, and finally the comparison module. Three different parallel TSP algorithms are used to show the usefulness of the proposed methodology. The experimental results are quite promising;the capacity of prediction is greater than 75%. © 2007 IADIS

关键词： Traveling salesman problem

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Workload analysis of SPECmail2009

Workload analysis of SPECmail2009

引用

International Symposium on Information Technology, ITSim

作者： Hitoshi, Oi Sho, Niboshi Computer Architecture and Operating Systems Group University of Aizu Aizu-Wakamatsu Japan

ISBN: (纸本)9781424467181

SPECmail2009 is a new benchmark suite for measuring the performance of corporate mail servers. It assumes the IMAP4 protocol for retrieving messages and a large fraction of transactions are for manipulating hierarchical messages and mail folders from the users connected via high-speed networks. In this paper, we present a performance analysis of SPECmail2009, including disk I/O behavior, quality of service metrics, and CPU time breakdown. The IMAP4's capability of directly manipulating the messages on the server makes SPECmail2009 a highly I/O-bound workload. Our experiments show that a combination of a small but fast access SCSI drive for indexing messages and larger but slower SATA drives for message files can be an option for building a cost-effective mail storage. Both of multiprocessing and multithreading are quite effective for SPECmail2009 especially in the user mode execution. © 2010 IEEE.

关键词： HIgh speed networks

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Real-time data injection on a dynamic data driven application system for wildland fire spread prediction in grid environments

Real-time data injection on a dynamic data driven applicatio...

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23rd IEEE International Parallel and Distributed Processing Symposium, IPDPS 2009

作者： Rodríguez, Roque Computer Architecture and Operating Systems Department Universitat Autönoma de Barcelona

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Increasing the Performability of computer Clusters Using RADIC II

Increasing the Performability of Computer Clusters Using RAD...

引用

International Conference on Availability, Reliability and Security, ARES

作者： Guna Santos Angelo Duarte Dolores Rexachs Emilio Luque Computer Architecture and Operating Systems department University Autonoma of Barcelona Barcelona Spain

ISBN: (纸本)9780769531021

Performance and availability form an undissociable binomial for some kind of applications. Therefore, the fault tolerant solutions must take into consideration these two constraints when it has been designed. Our previous work, called RADIC, implemented a basic level protection allowing to recover from faults just using the active cluster resources, changing the system configuration. However, Such approach may genenerate some performance degradation in some cases. In this paper, we present RADIC II, which incorporates a new protection level using dynamic redundancy, allowing to mitigate or avoid the recovery side-effects. Such functionality allows restoring a changed system configuration and it can avoid the configuration changes. The results has shown that RADIC-II operates correctly and becomes itself as a good approach to provide high availability to the parallel applications without suffer a system degradation in post-recovery execution.

关键词： Availability Application software Degradation Protection High performance computing Fault tolerant systems Fault tolerance Redundancy Concurrent computing System performance

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Predictive and distributed routing balancing on high-speed cluster networks

Predictive and distributed routing balancing on high-speed c...

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23rd International Symposium on computer architecture and High Performance Computing, SBAC-PAD 2011

作者： Castillo, Carlos Núñez Lugones, Diego Franco, Daniel Luque, Emilio Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona Spain

ISBN: (纸本)9780769545738

In high performance clusters current parallel application communication needs such as traffic pattern, communication volume, etc., change along time and are difficult to know in advance. Such needs often exceed or do not match available resources causing resource use imbalance, network congestion, throughput reduction and message latency increase, thus degrading the overall system performance. Studies on parallel applications show repetitive behavior that can be characterized by a set of representative phases. This work presents a Predictive and Distributed Routing Balancing (PRDRB) technique, a new method developed to gradually control network congestion, based on paths expansion, traffic distribution, applications pattern repetitiveness and speculative adaptive routing, in order to maintain low latency values. PRDRB monitors messages latencies on routers and logs solutions to congestion, to quickly respond in future similar situations. Traffic congestion experiments were conducted in order to evaluate the performance of the method, and improvements were observed. © 2011 IEEE.

关键词： Traffic congestion

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Transparent fault tolerance middleware at user level

Transparent fault tolerance middleware at user level

引用

2012 10th Annual International Conference on High Performance Computing and Simulation, HPCS 2012

作者： Castro, Marcela Rexachs, Dolores Luque, Emilio Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona Spain

ISBN: (纸本)9781467323598

We present a design of a transparent fault tolerance middleware for message passing applications. The approach consists in transforming the interconnections used by the application in reliable ones and support log-based rollback recovery protocol. When one of the nodes of the cluster fails, the processes are recovered in a new one and the connections are reestablished. All this work is made automatically and in a transparent way for the application. This service can be optionally activated at runtime at user level. The models used for protection and recovering application and detection of failures are based on RADIC architecture. We have tested this middleware by executing a master-worker (M/W) and SPMD applications which follow different communication patterns. © 2012 IEEE.

关键词： Fault tolerance

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Simulation and computational analysis of multiscale graph agent-based tumor model

Simulation and computational analysis of multiscale graph ag...

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2019 International Conference on High Performance Computing and Simulation, HPCS 2019

作者： Tashakor, Ghazal Suppi, Remo Universitat Autnoma de Barcelona Department Computer Architecture Operating Systems Barcelona Spain

ISBN: (纸本)9781728144849

This paper deals with the cellular biological network analysis of the tumor-growth model, consisting of multiple spaces and time scales. In this paper, we present a model in graph simulation using ABM for tumor growth. In particular, we propose a graph agent-based modeling and simulation system in the format of tumor growth scenario for evolving analysis. To manage cellular biological network analysis, we developed a workflow that allows us to estimate the tumor model and the complexity of the evolving behavior in a principled manner. By developing the model using Python, which has enabled us to run the model multiple times (more than what is possible by conventional means) to generate a large amount of data, we have succeeded in getting deep in to the micro-environment of the tumor, employing network *** agent-based modeling with graph-based modeling to simulate the structure, dynamics, and functions of complex networks is exclusively important for biological systems with a large number of open parameters, e.g., epidemic models of disease spreading or cancer. Extracting data from evolutionary directed graphs and a set of centrality algorithms helps us to tackle the problems of pathway analysis and to develop the ability to predict, control, and design the function of metabolisms. Reproducing and performing complex parametric simulations a known phenomenon at a sufficient level of detail for computational biology could be an impressive achievement for fast analysis purposes in clinics, both on the predictive diagnostic and therapeutic side. © 2019 IEEE.

关键词： Tumors

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Data injection at execution time in grid environments using Dynamic Data Driven Application System for wildland fire spread prediction 10

Data injection at execution time in grid environments using ...

引用

10th IEEE/ACM International Symposium on Cluster, Cloud, and Grid Computing, CCGrid 2010

作者： Rodríguez, Roque Cortés, Ana Margalef, Tomás Computer Architecture and Operating Systems Universitat Autónoma de Barcelona Barcelona Spain

ISBN: (纸本)9781424469871

In our research work, we use two Dynamic Data Driven Application System (DDDAS) methodologies to predict wildfire propagation. Our goal is to build a system that dynamically adapts to constant changes in environmental conditions when a hazard occurs and under strict real-time deadlines. For this purpose, we are on the way of building a parallel wildfire prediction method, which is able to assimilate real-time data to be injected in the prediction process at execution time. In this paper, we propose a strategy for data injection indistributed environments. © 2010 IEEE.

关键词： Forecasting

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Transparent fault tolerance solution at socket level based on RADIC

Transparent fault tolerance solution at socket level based o...

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2012 10th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2012

作者： Castro, Marcela Rexachs, Dolores Luque, Emilio Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona Spain

ISBN: (纸本)9780769547015

We present a transparent middleware for fault tolerance based on RADIC, Redundant Array of Distributed Independent Controllers, a transparent and scalable fault tolerant architecture for parallel applications. It is designed at socket level and makes a secure tunnel connection able to keep the tcp sessions established by the application in spite of node failures. It is located at user level and is independent of the message-passing communication library being used. The protection gets through uncoordinated checkpoints and log message and the recovery are done in a automatic way so in case of node failures there is no need of intervention of the administrator. We have tested our fault tolerance system by executing a master-worker (M/W) and SPMD applications that follow different communication patterns. © 2012 IEEE.

关键词： Fault tolerance

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Development and Tuning Framework of Master/Worker Applications

Development and Tuning Framework of Master/Worker Applicatio...

引用

Automatic Performance Analysis 2005

作者： Morajko, Anna César, Eduardo Caymes-Scutari, Paola Mesa, José G. Costa, Genaro Margalef, Tomàs Sorribes, Joan Luque, Emilio Computer Architecture and Operating Systems Dept Universitat Autònoma de Barcelona Spain

Parallel/distributed programming is a complex task that requires a high degree of expertise to fulfill the expectations of high performance computation. The Master/Worker paradigm is one of the most commonly used because it is easy to understand and there is a wide range of applications that match this paradigm. However, there are certain features, such as data distribution and the number of workers that must be tuned properly to obtain adequate performance. In most cases such features cannot be tuned statically since they depend on the particular conditions of each execution. In this paper, we show a dynamic tuning environment that is based on a theoretical model of Master/Worker behavior and allows for the adaptation of such applications to the dynamic conditions of execution. The environment includes a pattern based application development framework that allows the user to concentrate on the design phase and makes it easier to overcome performance bottlenecks. © 2006 Dagstuhl Seminar Proceedings. All rights reserved.

关键词： dynamic tuning performance analysis performance model

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