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Scientific Programming
Volume 15, Issue 4, Pages 193-211

Specification and Runtime Workflow Support in the ASKALON Grid Environment

Radu Prodan

Institute of Computer Science, University of Innsbruck, Technikerstraße 21a, A-6020 Innsbruck, Austria

Received 30 November 2007; Accepted 30 November 2007

Copyright © 2007 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We describe techniques to support the runtime execution of scientific workflows in the ASKALON Grid environment. We present a formal model and three middleware services that support in combination the effective execution in heterogeneous and dynamic Grid environments: performance prediction, scheduling, and enactment engine. We validate our techniques with concrete experimental results for two real-world applications executed in the Austrian Grid environment.