151 research outputs found

    Performance Modeling of the PeopleSoft Multi-Tier Remote Computing Architecture

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    Complex client-server configurations being designed today require a new and closely coordinated approach to analytic modeling and measurement. A closed queuing network model for a two-tiered PeopleSoft 6 client-server system with an Oracle database server is demonstrated using a new performance modeling tool that applies mean value analysis. The focus of this work is on the measurement and modeling of the PeopleSoft architecture to provide useful capacity planning insights for an actual large-scale university-wide deployment. A testbed and database exerciser are then developed to measure model parameters and perform the initial validation tests. The testbed also provides preliminary test data on a proposed three-tiered deployment architecture that includes the Citrix WinFrame environment as an intermediate level between the client and the Oracle server.http://deepblue.lib.umich.edu/bitstream/2027.42/107929/1/citi-tr-97-5.pd

    Towards a Regression Test Selection Technique for Message-Based Software Integration

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    Regression testing is essential to ensure software quality. Regression Test-case selection is another process wherein, the testers would like to ensure that test-cases which are obsolete due to the changes in the system should not be considered for further testing. This is the Regression Test-case Selection problem. Although existing research has addressed many related problems, most of the existing regression test-case selection techniques cater to procedural systems. Being academic, they lack the scalability and detail to cater to multi-tier applications. Such techniques can be employed for procedural systems, usually mathematical applications. Enterprise applications have become complex and distributed leading to component-based architectures. Thus, inter-process communication has become a very important activity of any such system. Messaging is the most widely employed intermodule interaction mechanism. Today\u27s systems, being heavily internet dependent, are Web-Services based which utilize XML for messaging. We propose an RTS technique which is specifically targeted at enterprise applications

    Towards a Regression Test Selection Technique for Message-Based Software Integration

    Get PDF
    Regression testing is essential to ensure software quality. Regression Test-case selection is another process wherein, the testers would like to ensure that test-cases which are obsolete due to the changes in the system should not be considered for further testing. This is the Regression Test-case Selection problem. Although existing research has addressed many related problems, most of the existing regression test-case selection techniques cater to procedural systems. Being academic, they lack the scalability and detail to cater to multi-tier applications. Such techniques can be employed for procedural systems, usually mathematical applications. Enterprise applications have become complex and distributed leading to component-based architectures. Thus, inter-process communication has become a very important activity of any such system. Messaging is the most widely employed intermodule interaction mechanism. Today\u27s systems, being heavily internet dependent, are Web-Services based which utilize XML for messaging. We propose an RTS technique which is specifically targeted at enterprise applications

    CoMoM: Efficient Class-Oriented Evaluation of Multiclass Performance Models

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    We introduce the Class-oriented Method of Moments (CoMoM), a new exact algorithm to compute performance indexes in closed multiclass queueing networks. Closed models are important for performance evaluation of multi-tier applications, but when the number of service classes is large they become too expensive to solve with exact methods such as Mean Value Analysis (MVA). CoMoM addresses this limitation by a new recursion that scales efficiently with the number of classes. Compared to the MVA algorithm, which recursively computes mean queue-lengths, CoMoM carries on in the recursion also information on higher-order moments of queue-lengths. We show that this additional information greatly reduces the number of operations needed to solve the model and makes CoMoM the best-available algorithm for networks with several classes. We conclude the paper by generalizing CoMoM to the efficient computation of marginal queue-length probabilities, which finds application in the evaluation of state-dependent attributes such as energy consumption or quality-of-service metrics

    Realizing Business Benefits from Company IT Standardization: Case Study Research into the Organizational Value of IT Standards, Towards a Company IT Standardization Management Framework.

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    From a practical point of view, this research provides insight into how company IT standards affect business process performance. Furthermore it gives recommendations on how to govern and manage such standards successfully with regard to their selection, implementation and usage. After evaluating this research Business may wish to reconsider the way it currently views the value of company IT standards and the manner with which it deals with them.

    A two-tier adaptive approach to securing successful ERP implementation

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    In recent years, a significant volume of industrial and academic research has been directed towards understanding the evolution and development of ERP systems and their associated applications. However, the associated technological and social changes are significant, and although many corporations have successfully implemented ERP, there have also been many reported cases of failed implementation. This has led several researchers to examine in detail the causes of these failures, in an effort to identify critical success factors associated with successful implementation. This dissertation reports on an action research study that arose from an initiative designed to improve the likelihood of success when implementing a particular UKdeveloped ERP system in China, namely `System 21' from JBA International. The project in which this research is embedded was a joint venture between JBA and a leading US beverage company, Pepsi Cola. The dissertation initially focuses on the analysis of underlying reasons for pilot project failures in this joint venture. This draws upon qualitative data from managers, consultants and other stakeholders involved in the ERP implementation at three geographically dispersed sites. The research then turns to an examination of ERP implementation methodology in the context of joint venture collaboration and associated issues such as change management and business process (re)engineering. This is grounded in a literature review of several approaches adopted by the major ERP solution providers. The literature review phase is followed by the design and distribution of a detailed questionnaire aimed at identifying, and subsequently addressing, the concerns of various customer stakeholders in a number of Hong Kong based businesses spanning a range of industrial sectors. Its aim was to secure the necessary improvements in methodology required to underpin the successful implementation in future Pepsi Joint Venture projects in China. Ultimately, this led to a set of recommendations in the form of a strategic framework for implementing ERP systems in China. In summary, a key deliverable arising from the research was the production of a business model for the achievement of success when implementing joint venture ERP systems in China. A second related deliverable is the improvement of the generic implementation methodology currently available to customers of `System 21'. This has been achieved by developing a framework evolved from an adaptive approach to the implementation of ERP systems. To a great extent, the findings and recommendations are also applicable to other multinational companies who are operating in China and keen on implementing ERP systems within this particular setting, with its associated cultural and other restrictions.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
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