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Using High-Level Petri Nets for Hierarchical Grid Workflows

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4 Author(s)
Alt, M. ; University of Muenster, Germany ; Gorlatch, S. ; Hoheisel, A. ; Pohl, H.-W.

An increasingly popular application programming model for Grids is to deploy often-used functionalities as remote services on high-performance hosts, following the principles of a service-oriented architecture. Complex applications are created by using several services and specifying a workflow between them. We discuss how workflows of Grid applications can be described easily as High-Level Petri Nets (HLPN), in order to orchestrate and execute distributed applications on the Grid automatically. In order to simplify the handling of complex and large-scale workflows, we introduce hierarchical Grid workflows, making use of the Petri Net refinement paradigm that allows to represent sub-workflows by single graph elements. We show how a complex application, the Barnes-Hut algorithm for N-Body simulation can be expressed as a hierarchical HLPN, using our platform-independent, XML-based Grid Workflow Description Language (GWorkflowDL). We discuss how the GWorkflowDL can be adapted to current Grid technologies, in particular to Java/RMI and the recent WSRF framework.

Published in:

e-Science and Grid Computing, 2006. e-Science '06. Second IEEE International Conference on

Date of Conference:

Dec. 2006

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