A vital issue in context of modern distributed computing environments is a simple and safe use of the computing, storage and communication facilities present on the network. In this paper we propose an agent based architectural concept for such an environment , which should assist the user in submitting requests to the distributed system in a transparent… (More)
Bounding techniques for queueing network models used to analyze the performance of parallel and distributed computer systems accept single values as model inputs. Uncertainties or variabilities in service demands may exist in many types of systems. Using models with a single aggregate mean value for each parameter for such systems can lead to inaccurate or… (More)
In a study based on a questionnaire and an empirical test three graphical user interfaces for the DOS operating system commands (GEM, Windows 1.04, Windows 2.01) are compared.
We discuss the general objectives and the design of base mechanisms for managing resource sharing in a heterogeneous distributed environment. Given the need for simple , safe use of the computing and communication facilities present on the network, the proposed environment should assist the user in submitting requests to the distributed system in a… (More)
The development of parallel programs following the paradigm of communicating sequential processes to be executed on distributed memory multiprocessor systems is addressed. The key issue in programming parallel machines today is to provide computerized tools supporting the development of eecient parallel software, i.e. software eeectively harnessing the… (More)
In this paper we analyze a graph model representing the dependency and communication structure of a parallel application. This model is called Structural Par-allelism Graph (SPG) and is similar to a task graph model. Nodes represent program components, arcs represent dependencies or activation (communication) components. This model can either be speciied by… (More)
Preface Due to the technological progress of parallel processing systems and their increasing availability for scientiic and commercial applications, the appropriate development of optimum parallel programs is a challenging task for software engineers of parallel systems. Besides other aspects, the objective to design and implement parallel programs showing… (More)