Object-oriented descriptions are gaining more and more importance in the high-level specification of hardware/software systems. Hiding the complexity from the developer is one of the key tasks in order to master the complexity of todays systems. With the high grade of abstraction necessary on the system level the automatic partitioning of a system is a difficult problem. In this paper we theref...

In a typical lattice QCD project the total runtime of code on a supercomputing platform is often measured in months or even years. This means that even a modest improvement in the performance of the code can yield very tangible benefits. There are two aspects to the optimisation of code for parallel machines: single-node optimisation and the minimisation of the overhead incurred by inter-node c...

Efficient solution of large-scale, ill-conditioned and highly-indefinite algebraic equations often relies on high quality preconditioners together with iterative solvers. Because of their robustness, factorizationbased algorithms play a significant role in developing scalable solvers. We discuss the state-of-the-art, high performance sparse factorization techniques which are used to build spars...

Traditional collaborative work environments are often proprietary systems. However, the demands of todays e-worker are such that they use their own tools and services and collaborate across company boundaries making highly integrated solutions less feasible. Service oriented computing provides an obvious solution here, in providing mechanisms to loosely integrate many tools and services. In thi...

It is common sense that security, privacy, mobility and quality-of-service are the vital parts of future Internet architectures. Nevertheless these aspects are still well separated fields of research resulting in a complex and highly redundant protocol stack within todays communication. Contrary to this our Future Internet design combines these requirements in a integrated and generalized appro...

Within the beginning of the Internet there was always a need for an automatic browsing its resources for many purposes like: indexing, cataloguing, validating, monitoring, etc. Because of a todays large volume of the World Wide Web the term Internet is often wrongly identified with the single HTTP protocol service. The process of browsing the World Wide Web in automated manner is called crawlin...

In this article we present a communication language and a design concept for a diagnosis agent. The communication language is divided in two parts. One part contains primitives necessary to control and query the agent. The other provides constructs for formulating the structure and behavior of systems to be diagnosed, and for observations determining the current state of the system. Additionall...

Developing software systems is a complex activity that involves numerous tasks that are critical for a successful release. Increasing size of software systems, software maintenance, versioning and distributed global development combined with ever growing expectations from users complicate development. Using a well-designed software development platform one can automate and simplify considerable...

Todays networks are characterized by heterogeneous environments. Various transmission techniques coexist and offer different bandwidths at different costs. Because of video conferences and similiar applications becoming more and more important this paper presents the architecture of the video communication system ”XNetvideo”, which is scalable in terms of SNR (signal to noise ratio)-scaling, im...

While standard processors achieve supercomputer performance, a performance gap exists between the interconnect of MPP's and COTS. Standard solutions like Ethernet can not keep up with the demand for high speed communication of todays powerful CPU's. Hence, high speed interconnects have an important impact on a cluster's performance. While standard solutions for processing nodes exist, communica...