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The ability to deliver different performance levels based on tenant-specific service level agreements (SLAs) is a key requirement for multi-tenant Internet applications. However, workload variations and extensive resource sharing among tenants make this goal hard to achieve. We address the issue with a performance regulator based on feedback-control. The regulator has a hierarchical structure, with...
As an infrastructure for data distribution, overlay networks have to feature efficient routing and adequate robustness to achieve fast and accurate data distribution in the environment with node churn. Considering that the existing overlay networks mostly focus on single optimization objective and fail to ensure routing efficiency and robustness simultaneously, a hybrid overlay network for content-based...
The Internet-based virtual computing environment (iVCE) provides on-demand aggregation and autonomic collaboration mechanisms to facilitate the utilization of autonomous and dynamic Internet resources. Load balancing and fault tolerance are important issues when scheduling those transient resources. In this paper, we propose a mobility mechanism for the migration of various roles of agents in the...
Node clustering is an effective solution for achieving good performance and high reliability for peer-to-peer (P2P) systems. To improve the performance of a clustered P2P system, it is important to balance the service load among the clusters in the system. In this paper, we describe a diffusive load balancing scheme for clustered P2P systems, which dynamically adjusts the size of the clusters, by...
High performance computing (HPC) by parallel computing effort faces several challenges. The first challenge is the efficient design and management of the parallel computing resources of the hardware platform. The second challenge is the transformation of the sequential program meant for classic Von Neumann architecture to explicit parallel instruction computing (EPIC) architecture. The third challenge...
Petroleum industry supply chain is a complex supply chain with large number of processes starting right from extraction till customer delivery. In this paper multi-agent technology has been applied to make the supply chain faster as compared to conventional supply chain practices. Here a representative but exhaustive model is considered, by taking into account the various options available at each...
In this paper, we propose a framework to enhance user perceived quality in a multihomed terminal. Based on the observed media independent handover parameters from all the interfaces, the terminal is made aware of the performance of the different access networks and it can intelligently select the interface to send out the data packets. Several schemes, for the purpose of load balancing, are defined...
This paper presents the parallelization of a machine learning method, called the AdaBoost algorithm. The parallel algorithm follows a dynamically load-balanced master-worker strategy, which is parameterized by the granularity of the tasks distributed to workers. We first show the benefits of this version with heterogeneous processors. Then, we study the application in a real, geographically distributed...
Many structured Peer-to-Peer-Systems (P2P) have been developed over the past years. However, most of them rely on hash-functions and thus put major restrictions on applications being implemented on top of them. In this paper we present a very detailed description of Papnet, a hash-free P2P overlay-network that supports range-queries and realizes an infinite alphanumeric address space that can be used...
Free-riding phenomenon is overwhelming in nowadays P2P network which causes researchers to investigate and develop many approaches to combat it. However, almost all the studies neglect the role of relative contribution of peers, namely willingness of contribution (WoC) in our paper. The ignorant to the ratio of peer's actually contribution to its physical capability would undoubtedly lead to unfairly...
Distributed Web crawling (DWC) over DHTs is proposed to solve the bottlenecks in the traditional Web crawling. The core of this kind of system is its fully distributed task scheduling mechanism in which the crawlers are treated as peers and the crawlees are treated as resources maintained by the peers. A system model based on the content addressable network (CAN) can further optimize the scheduling...
As virtualization technology is used widely in cloud computing, there are more and more interactive workloads being deployed on virtual machine (VM) environment. Although improving interactive performance has been heavily studied in operating system area, in consolidated VM environment, the improvements of guest OS are usually offset by the more coarse-grained VM scheduler, which may cause poor interactive...
This paper investigates and analyses the dynamics engendered by the engineering of self-organisation in a global Service Oriented Architecture. The effects are assessed via a resource allocation algorithm for load balancing, based on the observed behaviour of foraging honeybees. It is implemented at the application layer of a simulated server farm type system and its impact is investigated across...
We design and evaluate a hybrid load balancing policy, which selects effective node sets in the stage of static load balancing to lower the odds of selecting ineffective nodes and makes use of the stage of dynamic load balancing. When a node status changes, a new substitute can be located in the shortest time to maintain the execution performance of the system. The algorithm deals with an effective...
Grid has evolved dramatically into the era of service-oriented grid, which facilitates building of large-scale systems in standard fashions, reusability of essential functions, and interoperability among components. However, grid resource allocation is still a challenging problem for which a grid scheduler has to be operating in a dynamic and uncertain environment. Conventional scheduling algorithms...
Grid technology has being widely accepted in distributed resources sharing and high performance computing cross multi administrative domains. In this paper, we analysis the security issues in grid computing environments, and propose a security framework for VegaGOS which is a service oriented architecture middleware developed for the China National Grid. We address mutual authentication using certificate...
In this work, we consider the selection of complexity and rate controlling source coding parameters jointly with transmitter power. Power invested during source encoding can potentially improve coding efficiency while transmission power determines the capacity of the delivery channel. A complexity scalable source encoder is a useful tool during overall system optimization as it allows flexible allocation...
Managing hardware resources efficiently when they are shared in virtualized environment is a critical issue for improving application QoS. For CPU resources, virtual machine scheduling delays should be additionally concerned, because they cause unexpected service delays to guest applications and can consequently violate the application QoS. There have been many researches to manage CPU resources by...
Because of the dynamic nature and an instability of grid computing environment, system behavior in terms of QoS depends crucially on the selection of appropriate subset of the available resources. Thus, a well-defined system model that provides high system availability using a scheduling mechanism is required. In this paper, we propose the SLA based Policy Administrator (SPA) with QoS constraints...
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