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A queuing system with dual services, i.e., the primary service and the auxiliary service, is considered in the present article. The server has to allocate part of its capacity to process the additional service when the auxiliary service is requested. We show that the possible optimal auxiliary capacity is actually on the convex envelope of the auxiliary cost function. Also, the optimal control policy...
It's necessary to accelerate the modernization process of folk sports' reservation and ways and means of passing down. Based on Web system, this research uses advanced computer technology, information technology and database theory, to establish necessary database for folk sports to design and develop management information system, so as to achieve modernization and maximize reservation and passing-down...
A two-server service network has been studied by Gilbert and Weng from the principal-agent perspective. In the model, services are rendered by two independent facilities coordinated by an agency. The agency must devise a strategy to allocate customers to the facilities and determine the compensation. A common queue allocation scheme and separate queue allocation scheme are then compared. It has been...
The growing popularity of hosted storage services and shared storage infrastructure in data centers is driving the recent interest in resource management and QoS in storage systems. The bursty nature of storage workloads raises significant performance and provisioning challenges, leading to increased infrastructure, management, and energy costs. We present a novel dynamic workload shaping framework...
The calculus of deterministic constraints on service and traffic streams offers a rich language to specify service guarantees. In particular, the service curve earliest deadline first (SCED) algorithm has an associated feasibility test given by linear constraints. Users sending streams of data through the server may have differing needs for delay and throughput.We suggest a way based on utility function...
Cluster computing is an efficient computing paradigm for solving large-scale computational problems. Resource management is an essential part in such a computing system. A service provider uses computational resources to process a customer's service request. In an effort to maximize a service provider's profit, it becomes commonplace and important to prioritize services in favor of customers who pay...
We introduce the coupled placement problem for modern data centers spanning placement of application computation and data among available server and storage resources. While the two have traditionally been addressed independently in data centers, two modern trends make it beneficial to consider them together in a coupled manner: (a) rise in virtualization technologies, which enable applications packaged...
A peer-to-peer server network system consists of a large number of autonomous servers logically connected in a peer-to-peer way where each server maintains a collection of documents. When a query of storing new documents is received by the system, a distributed search process determines the most relevant servers and redirects the documents to them for processing (compressing and storing at the right...
The performance of Web servers and application servers is a crucial factor for the success of the underlying business activity. Current commercial servers (such as Apache and Microsoftpsilas IIS) usually employ a thread-based concurrency policy for executing request simultaneously. However, with this policy the throughput tends to collapse when massive overload occurs. Event-based concurrency has...
This paper presents the symmetric mapping pattern, an architectural pattern for the design of resource supply systems. The focus of symmetric mapping is on separation of concerns for cost-effective resource allocation. It divides resource supply in three functions: (1) Users and providers match and engage in resource supply agreements, (2) users place tasks on subscribed resource containers, and (3)...
Grid data sharing systems usually provide a data-intensive application with either a prestaging mechanism or an on-demand access mechanism to access shared data. Prestaging systems simultaneously download an entire shared file from multiple data sources even when only a tiny file fragment is required. Such systems consume unnecessary data transmission time and storage space. On demand access systems,...
Server virtualization enables dynamic workload management for data centers. However, especially live migrations of virtual machines (VM) induce significant overheads on physical hosts and the shared network infrastructure possibly leading to host overloads and SLA violations of co-hosted applications. While some recent work addresses the impact of live migrations on CPUs of physical hosts, little...
The IP Multimedia Subsystem (IMS) serves as universal platform for fast and standardized creation of mobile services. Typical deployment models for the IMS favor centralized session control and application servers. Furthermore, they rely on sophisticated border elements for, e.g., policy enforcement. One step towards a simpler architecture is the integration of call control, application server, and...
Policy based resource management will form the cornerstone of service differentiation that will drive IMS service deployment. While the IMS specifications are largely finalized, the policy based QoS provisioning architecture still faces many deployment challenges including flexible, application driven policy control, end to end policy provisioning and policy refinement. To accelerate the maturity...
We propose a general model for resources allocation of virtual machines in multi-tier distributed environments. Our model describes each virtual machine and each physical host by a multi-dimensional resource vector, allowing the coexistence of both quantitative and qualitative resources, also handling different SLAs. As this model is a generalization of the classical 0/1 Knapsack Problem, we have...
The paper deals with the study of the optimisation of the distribution of the download time from a particular video on demand system. This VOD system is based on grid delivery network which is an hybrid architecture based on P2P and grid computing concepts. In this system, the data are shrunk into fixed size blocks which must be replicated on hosts to decrease the total download time. We propose an...
Virtualization technologies can improve IT resource utilization and increase the flexibility needed to adapt to changing requirements and workloads. And, standard-based management enables a more integrated and cost effective development of the interoperable management solutions. With standard-based virtual infrastructure management, virtualization technologies in the distributed and heterogeneous...
In this paper, we consider a single-server queue with Poisson inputs and two distinct service rates. The service rate employed at any given instant is decided by a resource allocation policy, based on the queue occupancy. We deal with the question of how often control information needs to be sent to the rate scheduler so as to stay below a certain probability of congestion. We first consider some...
The growing popularity of e-business has stimulated web sites to evolve from static content servers to complex multi-tier systems built from heterogeneous server platforms. E-businesses now spend a large fraction of their IT budgets maintaining, troubleshooting, and optimizing these web sites. It has been shown that such system management activities may be simplified or automated to various extents...
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