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The paper presents creating web system models. The aim of the work was to develop models of the distributed Internet system that allow the performance evaluation. From many possible methods we have selected Queueing Petri Nets consisted of two classes of formal models (Queuing Nets and Petri Nets). In the paper web systems are modeled by Queueing Petri Nets tool. The paper includes the selected results...
As the popularity of Internet services continues to rise, the need to understand the design of the data center systems hosting these workloads becomes increasingly important. Unfortunately, research in this area has been stifled, primarily due to a lack of tools, workloads, and rigorous evaluation methodology. Traditional tools, such as architectural simulators, do not directly address data center-level...
Fast-flux based service network is first introduced as a technique used to improve the reliability and quality of a service system. But recently, this technique is also adopted by cyber-criminals and Internet miscreants to evade identification and to frustrate law enforcement and anticrime efforts aimed at locating and shutting down the illegal service. Previous work on this topic focuses mostly on...
As other signaling protocols in the past, also SIP suffers of server overload leading to performance collapse. In this framework, recent Internet drafts propose the improvements of overload control mechanisms already presented in SIP and/or a closed loop system model for overload avoidance. In this framework, the paper presents the system simulator developed extending the network simulator (ns-2)...
Requirement of performance modeling during the early SoC design stages becomes increasingly important to take major system level decisions relating to hardware resources, mapping of functionality onto computing modules and selection of scheduling algorithms which affects the design significantly. In this work, we make use of queuing systems to model the data path of network processors to decide on...
Using performance model to analyze the Internet service is prevailing. However, the research of the performance model for mail server retrains in the immature status. In this paper, based on the queue theory, we propose a performance model for Domino mail server. The verification and analysis of the model are also presented. The experimental results show that this model characterizes the behavior...
In this paper we propose a performance measurement and queueing analysis for medium-high blocking probability where the service rate is less than equal to the arrival rate of parallel connection servers, and for which we can estimate the system response time. First, we calculate the system response time of the parallel connection servers. Second, we simulate the queueing model of the parallel connection...
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