Configuration of Distributed Message Converter Systems using Performance Modeling

To find a configuration of a distributed system satisfying performance goals is a complex search problem that involves many design parameters, like hardware selection, job distribution and process configuration. Performance models are a powerful tools to analyse potential system configurations, however, their evaluation is expensive, such that only a limited number of possible configurations can be evaluated. In this paper we present a systematic method to find a satisfactory configuration with feasible effort, based on a two-step approach. First, using performance estimates a hardware configuration is determined and then the software configuration is incrementally optimized evaluating Layered Queueing Network models. We applied this method to the design of performant EDI converter systems in the financial domain, where increasing message volumes need to be handled due to the increasing importance of B2B interaction

Dynamic server selection in a multithreaded network computing environment

Research has been conducted at the Iowa State University Center for Nondestructive Evaluation (CNDE) to create a structure in which existing numerical modeling programs can be converted to execute in a network computing environment. This research task is to include the development of an extensible architecture which accommodates the timely integration of new processing capabilities and requirements. The research was motivated by many needs within the CNDE to reduce the predicted run times associated with the current and future modeling programs

Service introduction in an active network

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 1999.Includes bibliographical references (p. 151-157).by David J. Wetherall.Ph.D

Design Development Test and Evaluation (DDT and E) Considerations for Safe and Reliable Human Rated Spacecraft Systems

A team directed by the NASA Engineering and Safety Center (NESC) collected methodologies for how best to develop safe and reliable human rated systems and how to identify the drivers that provide the basis for assessing safety and reliability. The team also identified techniques, methodologies, and best practices to assure that NASA can develop safe and reliable human rated systems. The results are drawn from a wide variety of resources, from experts involved with the space program since its inception to the best-practices espoused in contemporary engineering doctrine. This report focuses on safety and reliability considerations and does not duplicate or update any existing references. Neither does it intend to replace existing standards and policy

Asynchronous Coordination of Stateful Autonomic Managers in the Cloud

International audienceCloud computing is now an omnipresent paradigm in modern programming. Cloud applications usually consist of several software components deployed on remote virtual machines. Managing such applications is a challenging problem because manual administration is no longer realistic for these complex distributed systems. Thus, auto-nomic computing is a promising solution for monitoring and updating these applications automatically. This is achieved through the automation of administration functions and the use of control loops called au-tonomic managers. An autonomic manager observes the environment, detects changes, and reconfigures dynamically the application. Multiple autonomic managers can be deployed in the same system and must make consistent decisions. Using them without coordination may lead to inconsistencies and error-prone situations. In this paper, we present our approach for coordinating stateful autonomic managers, which relies on a simple coordination language, new techniques for asynchronous controller synthesis and Java code generation. We used our approach for coordinating real-world cloud applications

Online Assistance

From the introduction: This project entitled Online Assistance is efficient and designed to do only one thing, facilitate communications between help desk staff and end users. The overriding design goal is to be as simple and frictionless for both users and help desk staff as is possible. It can leverage SQL server for membership and role based security or integrate with windows authentication and Active Directory groups. Software Engineering occurs as a consequence of a process called “System Engineering”. Instead of concentrate solely on software, system-engineering focuses on a variety of elements like Analyzing, Designing and organizing these elements into a system. A help desk system is designed and implemented in a business setting. (Abstract provided by OPUS staff

Parameter dependencies for reusable performance specifications of software components

To avoid design-related per­for­mance problems, model-driven performance prediction methods analyse the response times, throughputs, and re­source utilizations of software architectures before and during implementation. This thesis proposes new modeling languages and according model transformations, which allow a reusable description of usage profile dependencies to the performance of software components. Predictions based on this new methods can support performance-related design decisions