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Die Leistung von Computersystemen ist die ausschlaggebende Größe für ihren Einsatz. Zur Messung der Leistung wird sehr oft das Benchmark-Verfahren als Standard-Tool eingesetzt, obwohl allgemein bekannt ist, dass die entsprechenden Ergebnisse nur eine sehr beschränkte Aussagekraft haben – dafür spricht natürlich ihre starke Orientierung an der Praxis. Modellbildende Techniken werden häufig zu Recht...
We develop a simple hierarchical model for the performance analysis of compute clusters assembled from multi-core compute nodes connected by a (high-speed) network. The performance is described by the dimensionless speed-up and efficiency in dependence on important hardware and application parameters. The hardware parameters are the number of compute nodes and the bandwidth the network, together with...
We present a new performance model based on the roofline concept for the analysis and performance prediction of distributed computing clusters. The background for our performance modeling is the 28 km InfiniBand interconnection between two bwGRiD clusters each consisting of 140 compute nodes in day-to-day production use. The model is used to analyze the MPI performance of intra-cluster communication...
We study the performance of coupled web servers and database servers of certain web-applications. We focus on the performance bottleneck of one of the most pressing applications and their average response time. Therefore we present the software architecture of this web-application, called "Study-Portal" of the University of Mannheim, and we identify typical workload scenarios. We discuss...
We discuss operational and organizational issues of an InfiniBand interconnection between two clusters over a distance of 28 km in day-to-day production use. We describe the setup of hardware and networking components, and the solution of technical integration problems. Then we present solutions for a federated authorization system for the cluster within our two participating universities and other...
There is a lot of talk about excellent customer service in all companies these days. The term 'agility' is used with great enthusiasm by many, though few really understand it. This talk will explore the issues of COST EFFECTIVE customer service and agility to achieve best overall business value, using the balanced score card approach as a basis.
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