M Tech Dissertations

Now showing 1 - 4 of 4

Open Access
Issues of computational resource allocation and load balancing in cloud computing using virtualization
(Dhirubhai Ambani Institute of Information and Communication Technology, 2009) Bhadani, Abhay Kumar; Chaudhary, Sanjay
With the advent of world wide web, the life of every person has changed drastically. No one can imagine a computer without being connected to the Internet. This dependency is likely to grow in coming years with the adoption of technologies like virtualization and cloud computing. Cloud Computing and Virtualizations one of the foremost technology which has attracted many researchers recently, which is directly going to benefit the end-users and data center service providers. It has many underlying benefits, one of them is directly related to the costs of deploying new servers. Few others are related to harnessing the power of the existing infrastructure and resources. When we look things from server side resource usage, things become quite challenging. Just to meet peak loads, high capacity servers are deployed, which remains underutilized most of the times on an average. With the help of virtualization technique, we can run multiple instances of different operating systems simultaneously. There are many virtualization tools available, which can be used to achieve maximum resource utilization. Making efficient use of computing resource (especially computational time) has always been a critical and challenging task. Several scheduling algorithms have been in place, proposed and implemented on one or other Operating Systems from time to time. But, since we have limited processors and things work in concurrent fashion, overload situation can occur hampering the overall objective, performance and throughput of the system. Things become even more challenging when it comes to distributed systems and load balancing. One of the key commercial player in the virtualization is VMWare, whereas Xen is an open-source free software. There are also few tools like Virtual Box, Linux VServer, OpenVZ, Virtuozzo and few others. Among these the most popular virtual machine monitor is Xen. The likely choice of experimenting with Xen is due to Open Source and wide acceptance by Linux community, and their continuous effort to improve, also it meets the need of industry standards at large. Consider a hypothetical scenario, where multiple instances of operating systems are running and is being used by the clients over the web in the form of cloud service. The user will use the system as if the whole server and/or system is dedicated to him. The user is completely unaware about the actual physical location of the server on which he is running his applications and disk storage space. Since, multiple OS are running on a single physical server, and multiple servers are running in the data centre. All connected via high speed network links. At some instance of time, one server may become overloaded, while other server may remain underutilized. This again poses challenge to distribute the load and make things work perfect in this situation. This situation can be handled using load balancing mechanism over the virtual machines. This thesis work tries to find a mechanism to balance the load based on computational time parameter of the virtual machines.
Open Access
Two-level pricing scheme for congestion control and service differentiation in the Internet
(Dhirubhai Ambani Institute of Information and Communication Technology, 2006) Kulkarni, Vineet; Srivastava, Sanjay; Lenin, R.B
It is the property of any good service provider that, if a user is ready to pay for the services he demands, the provider will ensure that the requested level of service is made available. Is this possible in the Internet? The answer is No. This is because there is no uniform economic model based on which service is provided in the Internet. Through pricing, we provide one such model which is sensitive to user demands and budgets. The proposed pricing mechanism performs the dual functions of providing service differentiation according to budgets, and doing congestion control through feedback at time scale comparable to a round trip time. We investigate the optimal rate allocation and stability issues of the proposed scheme. A two level pricing scheme is proposed to reflect the structure of the Internet. Data statistics are maintained as an aggregate, thus reducing the load on intermediate routers in the Internet. The scheme has been proposed so as to require minimal changes to the current Internet. The working of the pricing scheme in different traffic scenarios is demonstrated through simulations.
Open Access
Weblab: a framework for remote laboratories
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005) Agrawal, Awkash; Srivastava, Sanjay
Remote laboratories have been proposed and implemented in the past to address a number of issues, namely wider access to high-end expensive experiments, safety, and better resource utilization. However, the existing projects are designed for specific knowledge domains, and normally run in a dedicated access mode. There is a pressing need to share the limited laboratory resources of the academic institutions in India among the universities. Studies have suggested that most of the Indian universities have basic computing and Internet facility. In this work we propose a web-based 3-tier architecture (WebLab) that provides shared batch mode access to the experiments over low-bandwidth network to maximize the laboratory utilization. A generic experiment is modeled as a set of inputs, outputs, and constraints. A lab/experiment registration toolkit is designed to capture the metadata for the labs and experiments. This allows for a rapid and standardized integration of the experiments with the WebLab. A proof of concept lab is implemented on this architecture.
Open Access
Performance analysis of diffserv multicast (DSMCast) for heterogeneous receivers
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004) Bhatt, Amee; Jotwani, Naresh D.
Internet is a large infrastructure that provides means for global communication. One of the biggest challenges faced in its growth and maintenance is the provision for the best Quality of Service (QoS) to the end-user applications. There exist some mechanisms that have evolved to achieve QoS in IP networks and amongst them Differentiated Services (DiffServ) is a prevalent one. With the increased usage of multimedia applications such as video and audio conferencing, which primarily use multicast mode of communication, one obvious question that arises is whether suitable QoS in terms of resource assurance and service differentiation can be guaranteed to them. This thesis answers the question affirmatively and discusses a recently proposed approach: DSMCast, which attempts to offer QoS for multicast applications in DiffServ domain. The main objective of the thesis is to analyze how DSMCast provides support for heterogeneous QoS receivers participating in a multicast session. The performance analysis of DSMCast indicates that it can support the heterogeneous QoS requirements for the multicast receivers in a better way than traditional IP multicast. The simulation results bring out an important implication due to the nearness of receivers who have low QoS demands to those who have high QoS demands.

M Tech Dissertations

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