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The state-of-art web applications communicate and coordinate with number of geographically dispersed information resources providing information to huge number of users. Homogeneous server clusters are not capable of satisfying the growing demand of such applications including real time audio and video, PHP, JSP, ASP etc. Heterogeneity involves handling of low level interoperability issues e.g. mismatch...
Based on the technology of Linux Virtual Server, the load balancing system could solve server bottleneck problems which were brought by the development and application of Internet, network of geometric growth of subscribers and network flow. WLC scheduling algorithm is often adopted, and is a good effect. This paper puts forward a kind of optimization methods based on server performance calculating...
Requests scheduling in Web servers is a hot research topic. Many works aim at providing optimal algorithms according to various metrics. Most of these works are based on classical scheduling metrics, considering jobs completion times, but ignoring intermediate states. We claim that this choice conduces to the design of algorithm that do not efficiently share the system resources. Indeed, Web servers...
With the rapid growth of both information and users, how to effectively improve the quality of network service becomes an urgent problem to be addressed. Load balancing is to overcome this problem in an effective way. At present it is mainly achieved by the load-balancing hardware and software, but there are also many problems, such as unscientific and inaccurate algorithm, imperfect and impractical...
Energy efficiency is a very important issue to keep the "Green" Earth, especially in recent years. We have to save the energy consumption anywhere and anytime, including a large set of servers, such as servers in the Google company. In our research, we mainly consider one important energy-electric power. In our previous work, we discussed the difference energy model in cluster servers, and...
The increasing development of the Internet requires highly scalable, available, and reliable web servers in order to provide rapid response and high throughput to requests from hundreds millions users occurring at any time. The disadvantage of old fashioned approach which uses single-alone web servers is the problem of bottle-neck and overload on the server side as well as many additional problems...
This paper presents a comprehensive load balancing approach using priority based migration (PBM) mechanism for a trusted small scale distributed computing environment. A process migration server (PMS) that acts as a cluster management server reduces latency time in migrated process execution; leading to no starvation condition for any process thus achieving uniform distribution of load among all the...
Load balancing is critical to the performance of parallel processing systems. It is more difficult for network systems such as NIDS and Web Servers, because they must preserve flow order. But traditional flow-based load balancing schemes of network parallel processing systems, such as LLF, cost much resource and introduce lots of communication overhead. With the rapid popularization of multi-core...
Allocating resources in a Web server cluster is usually performed nowadays by a cluster administrator. However, due to the dynamics of the Internet as far as the use of resources is concerned, such a task may be considered critical and inefficient if accomplished manually. This paper presents an architecture that performs an automatic dynamic reconfiguration using a multi agent system. The architecture,...
Calculation of Web request load is an important prerequisite for the realization of Web server cluster's load-balancing, usually fuzzy mapping can be used to achieve this purpose, but if the fuzzy system was designed according to the conventional method, the system maybe show ldquorules explosionrdquo phenomenon, because the diverse types of Web requests need many system inputs, which lead to the...
The problem of finding efficient workload distribution techniques is becoming increasingly important today for heterogeneous distributed systems where the availability of compute nodes may change spontaneously over time. Therefore, the resource-allocation policy must be designed to be robust with respect to absence and re-emergence of compute nodes so that the performance of the system is maximized...
With the advent of cloud computing, massive and automated system management has become more important for successful and economical operation of computing resources. However, traditional monolithic system management solutions are designed to scale to only hundreds or thousands of systems at most. In this paper, we present Blue Eyes, a new system management solution to handle hundreds of thousands...
Server load balancing is indispensable in World Wide Web for providing high-quality service. In server load balancing, since the server loads and capacities are not always identical, traffic should be distributed by measuring server performance to improve the service quality. This paper proposes a load balancing technique conducted by passive measurement, which estimates the server performance through...
Many large Web sites get more than millions hits everyday. They need a scalable Web server system that can provide better performance to all the clients that may be in different geographical regions. Higher delays and losses are common on wide area network (WAN) links. To provide a better service to all the clients, it is natural to have fully replicated web server clusters in different geographical...
At present, Web applications and HTTP requests on the Internet are so explosively increasing that a large number of hot Web sites frequently confront with problems of server overloading. And how to provide various web services with high-level quality and satisfactory performance for Web clients has become one of the most urgent points we concern. In order to smoothly solve these problems, we proposed...
By the popularization of the Internet application, the performance requirement of Web servers is becoming higher and higher. Using several hosts as the cluster to provide services together is the common scheme for the moment, with high performance-price ratio, high reliability and scalability, while the key performance of the cluster system is the balancing algorithm. Based on the LVS project, this...
Computer systems are becoming more complex continuously and managing them is quite challenging even to the most skilled IT professionals. A promising way to address obstacles to efficient management and re-organization of computer systems relies on the automation of these tasks. An approach has been introduced that in which analytic performance models are combined with combinatorial search techniques...
Internet traffic has a characteristic of strong correlation. This traffic characteristic greatly complicates the problem of server performance modeling and optimization. Conventional time domain analysis has limitations in the study of the impact of complex traffic on server performance, because self-similarity of Internet traffic is often characterized in frequency domain. In this paper, we present...
This paper presents a mechanism to improve Web server performance with fuzzy-based techniques. A load balancing mechanism based on the fuzzy control technique is developed in such a way that ambiguous situations caused by workload estimation of cluster- based Web servers, client request rates, and dynamic request rates can be represented in an effective way. Extensive experiments show that the fuzzy-based...
In recent years, rapid popularization and growth of World Wide Web increases user and produces various services. Therefore, the workload of Web server is increased. Increased workload causes that Web server can not provide enough service frequently. Whenever such a thing happens, a user complains and service provider loses their honor. Generally, server overload problem is solved by server load balancing...
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