Abstract: Data Distribution Management (DDM) is a High Level Architecture/Run-time Infrastructure (HLA/RTI) service that manages the distribution of state updates and interaction information in large scale distributed...
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Abstract: Data Distribution Management (DDM) is a High Level Architecture/Run-time Infrastructure (HLA/RTI) service that manages the distribution of state updates and interaction information in large scale distributed simulations, limits and controls the volume of data exchanged during the simulation. In this paper we focus upon the following three DDM schemes: Region-Based, Fixed and Dynamic Grid-Based techniques. In an effort to determine the most efficient model for applying the DDM service, we developed a mini-RTI Kit framework and propose a set of benchmarks to compare these DDM schemes. Using the RTI Kit, we performed extensive simulation experiments and present our analysis of the results of numerous federation executions.
作者：
Debusmann, M.Fachhochschule Wiesbaden
University of Applied Sciences Department of Computer Science Distributed Systems Laboratory Kurt-Schumacher-Ring 18 WiesbadenD-65197 Germany
Managing distributed applications results in a large number of routine management tasks to be performed. Thus, the goal of management has to be the automation of these tasks to the greatest possible extent. This autom...
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Ad hoc networks are useful for providing communication support where no fixed infrastructure exists or the deployment of a fixed infrastructure is not economically profitable, and movement of communicating parties is ...
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Ad hoc networks are useful for providing communication support where no fixed infrastructure exists or the deployment of a fixed infrastructure is not economically profitable, and movement of communicating parties is allowed. Therefore, such networks are designed to operate in widely varying environments, from military networks to low-power sensor networks and other embedded systems. Frequent topology changes caused by node mobility make routing in ad hoc wireless networks a challenging problem. In this paper, we propose an efficient ad hoc routing algorithm, which we refer to as GZRP, a hybrid protocol that makes use of the ZRP scheme and the Global Positioning System (GPS). As opposed to the ZRP original scheme, our GZRP scheme consists of propagating the routing (query) messages only to the nodes that are further away from the query source. We discuss the algorithm, its implementation, and report on the performance of GZRP scheme, and compare it to the ZRP routing protocol using an extensive simulation experiment. Our results indicate clearly that GZRP outperforms ZRP by reducing significantly the number of route query messages, and thereby increases the efficiency of the network load. Furthermore, we show that careful GPS screening angle is an important factor in the success of the GZRP ad hoc routing protocol.
A web crawling system employing a parallel and distributed architecture needs to have a mechanism to bring the whole system in a coordinated state when the nodes are added to or removed from the system. This paper pre...
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A web crawling system employing a parallel and distributed architecture needs to have a mechanism to bring the whole system in a coordinated state when the nodes are added to or removed from the system. This paper presents an efficient dynamic reconfiguration model that can be used in such a system. The study shows that this model leads to some nice properties, such as load balance and low traffic in the system, which contribute to high performance. Currently this model is being implemented in WebGather, a well-known Chinese and English web search engine.
Global File Store (GFS) is a pervasive computing oriented file storage system. It puts forward an idea - put all files on the Internet. There are 3 features associated with GFS: massive storage, high performance and m...
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Global File Store (GFS) is a pervasive computing oriented file storage system. It puts forward an idea - put all files on the Internet. There are 3 features associated with GFS: massive storage, high performance and mobile computing support. The approach to construct GFS is to implement a layer on top of existing heterogeneous file systems. The above features are realized by means of multiple namespace, extensive use of caching and replication, and highly scalable architecture. The system is in the stage of prototype development.
In this paper, first studied are the distribution characteristics of user behaviors based on log data from a massive web search engine. Analysis shows that stochastic distribution of user queries accords with the char...
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In this paper, first studied are the distribution characteristics of user behaviors based on log data from a massive web search engine. Analysis shows that stochastic distribution of user queries accords with the characteristics of power-law function and exhibits strong similarity, and the user' s queries and clicked URLs present dramatic locality, which implies that query cache and 'hot click' cache can be employed to improve system performance. Then three typical cache replacement policies are compared, including LRU, FIFO, and LFU with attenuation. In addition, the distribution character-istics of web information are also analyzed, which demonstrates that the link popularity and replica pop-ularity of a URL have positive influence on its importance. Finally, variance between the link popularity and user popularity, and variance between replica popularity and user popularity are analyzed, which give us some important insight that helps us improve the ranking algorithms in a search engine.
Managing distributed applications results in a large number of routine management tasks to be performed. Thus, the goal of management has to be the automation of these tasks to the greatest possible extent. This autom...
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ISBN:
(纸本)0780367197
Managing distributed applications results in a large number of routine management tasks to be performed. Thus, the goal of management has to be the automation of these tasks to the greatest possible extent. This automation requires the definition of management algorithms which describe the behaviour of the management system. The paper presents AMANDA (Automated Management of distributed Applications), a phase-oriented method for developing management algorithms for CORBA applications. These management algorithms are defined using unified modelling language (UML) statecharts and are transformed into autonomous CORBA management objects.
Recent significant advances in artificial intelligence have led to the emergence of new concepts of soft computing genetic programming, evolutionary engineering, hybrid intelligent systems, and artificial life. EE des...
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ISBN:
(纸本)0769511651
Recent significant advances in artificial intelligence have led to the emergence of new concepts of soft computing genetic programming, evolutionary engineering, hybrid intelligent systems, and artificial life. EE design relies on evolutionary algorithms to construct or evolve complex systems. This paper is intended to highlight the concept of evolutionary engineering, the motivations behind the use of EE in building complex systems, and a step by step methodology for designing such systems. Finally, we emphasize on a typical example of "Brain Building design project using EE: the CAM Brain Machine.
We present the design, implementation, and evaluation of single assignment data structures and of a software controlled cache in an existing multi-threaded architecture platform – the Efficient Architecture for Runni...
We present the design, implementation, and evaluation of single assignment data structures and of a software controlled cache in an existing multi-threaded architecture platform – the Efficient Architecture for Running Threads (EARTH). The I-Structure Software-Controlled Cache (ISSC) exploits temporal and spatial locality of EARTH split-phased memory transactions for single-assignment memory references. Our experimental evaluation indicates that the caching mechanism for single-assignment storage makes the EARTH memory system more robust to variations in the latency of memory operations. As a consequence the system can be ported to a wider range of machine platforms and deliver speedup for both regular and irregular application.
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