the integration of legacy systems and enterprise applications with novel communications, internet, or networking services creates the problems of mismatches, information integration and possibly problems from the evol...
详细信息
ISBN:
(纸本)0769526403
the integration of legacy systems and enterprise applications with novel communications, internet, or networking services creates the problems of mismatches, information integration and possibly problems from the evolution of the systems themselves. Enterprise services to solve these problems are currently implemented via commodity server hardware or Application Specific Integrated Circuits (ASICs), which suffer from either poor performance or a lack of flexibility this paper presents an alternative to implementing these services by using Network Processors (NPs) as fast, flexible, and cost-efficient network appliances. It characterizes the hardware and software requirements of NP-based enterprise services, and presents a case study of a real-world enterprise problem. We implement a solution service to the problem on the Intel IXP2400, and present evaluation results that generalize the strengths, weaknesses, and requirements of the NP's role as a platform for enterprise service deployment.
Class-of-Service identification is a very useful task for enterprise, university and ISP networks. Peer-to-peer (P2P) traffic, being a significant portion of the network traffic today, constitutes a highly desirable c...
详细信息
ISBN:
(纸本)0769526403
Class-of-Service identification is a very useful task for enterprise, university and ISP networks. Peer-to-peer (P2P) traffic, being a significant portion of the network traffic today, constitutes a highly desirable class for identification. Accurate classification of P2P traffic is a challenging problem, and becomes even more. challenging when we are constrained to use only transport-layer header information. In this paper, we present a new approach for P2P traffic identification, that uses fundamental characteristics of P2P protocols, such as a large network diameter and the presence of many hosts acting both as servers and clients. We do not use any application-specific information, but we are, however able to identify both known and unknown P2P protocols in a simple and efficient way.
this paper shows that flexibility of workflow executions, i.e., the ability to deviate from a given model on the fly and during execution, is crucial for a wide applicability of workflow management technology in compu...
详细信息
ISBN:
(纸本)0769526950
this paper shows that flexibility of workflow executions, i.e., the ability to deviate from a given model on the fly and during execution, is crucial for a wide applicability of workflow management technology in computing grids. Since flexibility concepts for workflows have been elaborated extensively in conventional business-oriented domains, we show how to reuse and adapt them for workflow management in computation grids.
Modern Web sites provide multiple services that are often deployed through distributed architectures. the importance and the economic impact of Web-based services introduces significant requirements in terms of perfor...
详细信息
ISBN:
(纸本)0769526403
Modern Web sites provide multiple services that are often deployed through distributed architectures. the importance and the economic impact of Web-based services introduces significant requirements in terms of performance and quality of service. In this paper, we propose an access control mechanism for dynamic, Web-based systems. the proposed architecture takes into account two goals: the service of all requests pertaining to an admitted session until system saturation, and a graceful, controlled degradation of performance in case of overwhelming user request loads. the session-oriented behavior is obtained through an admission control mechanism that denies access to requests starting new sessions if the system is judged as overloaded. Graceful degradation is achieved through the refusal of single requests with increasing priority. Static priorities, determined for example, by the user category (guest, member, gold) are taken into account first. If the system is still in overload, the access control mechanism evaluates dinamically the popularity of single requests, and drops the least popular requests.
Grid computing is a form of distributedcomputingthat involves coordinating and sharing computing, application, data storage or network resources across dynamic and geographically dispersed organizations. the goal of...
详细信息
ISBN:
(纸本)3540319948
Grid computing is a form of distributedcomputingthat involves coordinating and sharing computing, application, data storage or network resources across dynamic and geographically dispersed organizations. the goal of grid task scheduling is to achieve high system throughput and to match the application needed withthe available computing resources. this is matching of resources in a non-deterministically shared heterogeneous environment, the complexity of scheduling problem increases withthe size of the grid and becomes highly difficult to solve effectively. To obtain good methods to solve this problem a new area of research is implemented. this area is based on developed heuristic techniques that provide an optimal or near optimal solution for large grids. In this paper we introduce a tasks scheduling algorithm for grid computing. the algorithm is based on Ant Colony Optimization (ACO) which is a Monte Carlo method. the paper shows how to search for the best tasks scheduling for grid computing.
In this paper, we introduce a novel distributed Mean field Genetic algorithm called MGA for the resource allocation problems in MPI environments, which is an important issue in parallel processing. the proposed MGA is...
详细信息
ISBN:
(纸本)3540476938
In this paper, we introduce a novel distributed Mean field Genetic algorithm called MGA for the resource allocation problems in MPI environments, which is an important issue in parallel processing. the proposed MGA is a hybrid algorithm of Mean Field Annealing (MFA) and Simulated annealing-like Genetic Algorithm (SGA). SGA uses the Metropolis criteria for state transition as in simulated annealing to keep the convergence property in MFA. the proposed MGA combines the benefit of rapid convergence property of MFA and the effective genetic operations of SGA. Our experimental results indicate that the composition of heuristic mapping methods improves the performance over the conventional ones in terms of communication cost, load imbalance and maximum execution time.
Some popular computing technologies, such as ubiquitous computing, grid computing and thin-client computing, bring people to a much more distributed and pervasive. computing environment. Based on these innovative tech...
详细信息
ISBN:
(纸本)9780769526942
Some popular computing technologies, such as ubiquitous computing, grid computing and thin-client computing, bring people to a much more distributed and pervasive. computing environment. Based on these innovative technologies, a distributed virtual personal computing (DVPC) paradigm is coming into being. One of the fundamental challenges in the DVPC design is the virtually integrated but physically distributed desktop system. We proposed Redar, a remote desktop architecture for the DVPC. Redar integrates various user interfaces from diverse service nodes into one virtual desktop, and present the virtual desktop to the ultra-thin user client. the user interfaces currently supported by Redar include the application GUIs as well as the, mobile storage interfaces. the key components in Redar are the GUI merger, the virtual desktop manager, the ultra-thin-client and the transport protocols. We have implemented Redar in a DVPC prototype system. According to our evaluation, Redar shows perfect display latency, storage I/O, overhead, scalability and robustness.
Grid computing has emerged as an effective means of facilitating the sharing of distributed heterogeneous resources, enabling collaboration in large scale environments. However, the nature of Grid systems coupled with...
详细信息
ISBN:
(纸本)9780769526942
Grid computing has emerged as an effective means of facilitating the sharing of distributed heterogeneous resources, enabling collaboration in large scale environments. However, the nature of Grid systems coupled withthe overabundance and fragmentation of information, makes it difficult to monitor resources, services, and computations in order to plan and make decisions. In this paper we present Gridscape II, a customisable portal component that can be used on its own or plugged-in to compliment existing Grid portals. Gridscape II manages the gathering of information from arbitrary, heterogeneous and distributed sources and presents them together seamlessly within a single interface. It also leverages the Google Maps API in order to provide a highly interactive user interface. Gridscape II is simple and easy to use, providing a solution to those users who do not wish to invest heavily in developing their own monitoring portal from scratch, and also for those users who want something easy to customise and extend for their specific needs.
the Bulk Synchronous parallelism (BSP) model is useful in developing scalable software for parallel computation: To adapt the BSP model to the Grid environment, the BSP-G, a BSP development library based on the servic...
详细信息
ISBN:
(纸本)9780769526942
the Bulk Synchronous parallelism (BSP) model is useful in developing scalable software for parallel computation: To adapt the BSP model to the Grid environment, the BSP-G, a BSP development library based on the services of Globus Toolkit has been proposed. In this paper, we further the work of BSP-G and introduce an agent assisted ServiceBSP model. the agent in this model could make a QoS-aware selection of computational services and monitor the status of those services. During the selection phase, the agent can handle the diversity of QoS information of services by referring to an ontology repository of Quality of Service(QoS). An experiment shows that the agent could provide users with satisfied supersteps by selecting Grid services on QoS demand.
Resource management is one of the crucial issues in the campus grid environment. In this paper, we propose a resources optimizing management scheme in the campus computational grid environment. the NPU Campus computat...
详细信息
ISBN:
(纸本)0769526950
Resource management is one of the crucial issues in the campus grid environment. In this paper, we propose a resources optimizing management scheme in the campus computational grid environment. the NPU Campus computational grid is introduced. then, we propose some resources optimizing management approaches. the application features are presented and analyzed.
暂无评论