the paper describes computer system consisting of a central server and a distributedcomputing system composed of multiprocessor servers using the MPI, computer clusters, computers of the PC and dedicated FPGA units. ...
详细信息
ISBN:
(纸本)9789531841306
the paper describes computer system consisting of a central server and a distributedcomputing system composed of multiprocessor servers using the MPI, computer clusters, computers of the PC and dedicated FPGA units. the field programmable gate array (FPGA) units will be connected to the system through PC. the communication of computational units withthe server is realized through Internet and LAN networks. the presented system executes a Pollard rho parallel Algorithm. the system's efficiency analysis let us estimate the time needed for breaking the ciphers with various key lengths and determine the level of security that they provide.
A parallel Direct Simulation Monte Carlo (DSMC) algorithm to solve a spatially inhomogeneous nonlinear equation of coagulation is presented. the algorithm is based on simulating the evolution of stochastic test partic...
详细信息
ISBN:
(纸本)9783642032745
A parallel Direct Simulation Monte Carlo (DSMC) algorithm to solve a spatially inhomogeneous nonlinear equation of coagulation is presented. the algorithm is based on simulating the evolution of stochastic test particles ensembles. the algorithm can be effectively implemented on parallel computers of different architectures including GRID infrastructure based on MPLS networks. A problem of minimizing the computational cost of the algorithm is considered. To implement the algorithm on GRID infrastructure we carry out preliminary simulation of an underlying network. Such simulation enables to define minimal network bandwidth necessary for efficient parallel decomposition of DSMC algorithm.
the emergence of new technologies provides the opportunity to develop novel solutions that facilitate the integration of the Visual disabled people in different activities of our daily life. this paper presents a dist...
详细信息
ISBN:
(纸本)9783642024801
the emergence of new technologies provides the opportunity to develop novel solutions that facilitate the integration of the Visual disabled people in different activities of our daily life. this paper presents a distributed intelligent architecture, called DIAMI, focused on facilitating the integration of blind musicians in orchestras. the DIAMI architecture provides a distributed, ubiquitous system aimed at providing a way for blind musicians to receive the instructions of the orchestra conductor in an unobstructive manner. the structure of the DIAMI architecture and the preliminary results obtained are presented in detail within this paper.
Conventional autotuning configuration of parameters in distributedcomputing systems using evolutionary strategies increases integrated performance notably, though at the expense of consuming too much measurement time...
详细信息
ISBN:
(纸本)9781424449231
Conventional autotuning configuration of parameters in distributedcomputing systems using evolutionary strategies increases integrated performance notably, though at the expense of consuming too much measurement time. An ordinal optimization (OO) based strategy is proposed in this work, combined with neural networks to improve system performance and reduce measurement time, which is fast enough to autotune configurations for distributedcomputingapplications. the method is compared with a well known evolutionary algorithm called Covariance Matrix Algorithm (CMA). Experiments are carried out using high dimensional rastrigin functions, which show that OO can reduce one to two orders of magnitude of simulation time while at the cost of an acceptable scope of optimization performance. We also carried out experiments using a real application system withthree-tier web servers. Experimental results show that OO can reduce 40% testing time on average at a reasonable and slight cost of optimization performance.
DHT systems are structured overlay networks capable of using P2P resources as a scalable platform for very large data storage applications. However, their efficiency expects a level of uniformity in the association of...
详细信息
ISBN:
(纸本)9781424447282
DHT systems are structured overlay networks capable of using P2P resources as a scalable platform for very large data storage applications. However, their efficiency expects a level of uniformity in the association of data to index keys that is often not present in inverted indexes. Index data tends to follow non-uniform distributions, often power law distributions, creating intense local storage hotspots and network bottlenecks on specific hosts. Current techniques like caching cannot, alone, cope withthis issue. We propose a distributed data structure based on a decentralized balanced tree to balance storage data and network load more uniformly across hosts. the results show that the data structure is capable of balancing resources, in particular when performing multiple keyword searches.
Non-negative matrix factorization (NMF) has been successfully used in audio source separation and parts-based analysis;however, iterative NMF algorithms are computationally intensive, and therefore, time to convergenc...
详细信息
Systolic array designs and dependency graphs are some of the most important class of algorithms in several scientific computing areas. In this paper, we first propose an abstraction based on the fundamental principles...
详细信息
ISBN:
(纸本)9783642032745
Systolic array designs and dependency graphs are some of the most important class of algorithms in several scientific computing areas. In this paper, we first propose an abstraction based on the fundamental principles behind designing systolic arrays. then, based on the abstraction, we propose a methodology to map a dependency graph to a generic multicore processor. then we present two case studies: Convolution and Transitive Closure, on two state of the art multicore architectures: Intel Xeon and Cell multicore processors, illustrating the ideas in the paper. We achieved scalable results and higher performance compared to standard compiler optimizations and other recent implementations in the case studies. We comment on the performance of the algorithms by taking into consideration the architectural features of the two multicore platforms.
this paper presents SYLPH, a novel distributed architecture which integrates a service-oriented approach into Wireless Sensor Networks. One of the characteristics of SYLPH is that it can be executed over multiple wire...
详细信息
ISBN:
(纸本)9783642024801
this paper presents SYLPH, a novel distributed architecture which integrates a service-oriented approach into Wireless Sensor Networks. One of the characteristics of SYLPH is that it can be executed over multiple wireless devices independently of their microcontroller or the programming language they use. SYLPH works in a distributed way so that most of the application code does not have to reside in a central node. Furthermore, SYLPH allows the interconnection of several networks from different wireless technologies, such as ZigBee or Bluetooth. this paper focuses on describing the main components of SYLPH and the issues that lead to design and develop this new approach. Results and conclusions are presented after evaluating a preliminary version of this architecture.
An emerging trend is the use of XML as the data format for many distributed scientific applications, withthe size of these documents ranging from tens of megabytes to hundreds of megabytes. Our earlier benchmarking r...
详细信息
the ever growing request for digital information raises the need for content distribution architectures providing high storage capacity, data availability and good performance. While many simple solutions for scalable...
详细信息
ISBN:
(纸本)9781424447282
the ever growing request for digital information raises the need for content distribution architectures providing high storage capacity, data availability and good performance. While many simple solutions for scalable distribution of quasi-static content exist, there are still no approaches that can ensure both scalability and consistency for the case of highly dynamic content, such as the data managed inside wikis. We propose a peer to peer solution for distributing and managing dynamic content, that combines two widely studied technologies: distributed hash tables (DHT) and optimistic replication. In our "universal wiki" engine architecture (UniWiki), on top of a reliable, inexpensive and consistent DHT-based storage, any number of front-ends can be added, ensuring both read and write scalability, as well as suitability for large-scale scenarios. the implementation is based on a distributed Interception Middleware, thus separating distribution, replication, and consistency responsibilities, and also making our system transparently usable by third party wiki engines.
暂无评论