RMOST: A Shared Memory Model for Online Steering

Authors:
Daniel Lorenz;Peter Buchholz;Christian Uebing;Wolfgang Walkowiak;Roland Wismüller
Affiliations:
Experimental Particle Physics, University of Siegen, Germany and Operating Systems and Distributed Systems, University of Siegen, Germany;Experimental Particle Physics, University of Siegen, Germany;Center for Information and Media Technology, University of Siegen, Germany;Experimental Particle Physics, University of Siegen, Germany;Operating Systems and Distributed Systems, University of Siegen, Germany
Venue:
ICCS '08 Proceedings of the 8th international conference on Computational Science, Part III
Year:
2008

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Abstract

Online steering means to visualize the current state of an application which includes application data and/or performance data, and to modify data in the application. Thus, in online steering the application as well as the steering tool must concurrently access and modify the same data at run time. In this paper a new model for online steering is presented which models the mechanism of online steering as access to a distributed shared memory. The integrity requirements of the steered application are analyzed. The integrity can be ensured through an appropriate consistency model. Finally, the online steering system RMOST is presented which is based on the distributed shared memory model and can be used to steer Grid jobs from the High Energy Physics experiment ATLAS.