Triana: A Graphical Web Service Composition and Execution Toolkit
ICWS '04 Proceedings of the IEEE International Conference on Web Services
Delivering web service coordination capability to users
Proceedings of the 13th international World Wide Web conference on Alternate track papers & posters
VGE - A Service-Oriented Grid Environment for On-Demand Supercomputing
GRID '04 Proceedings of the 5th IEEE/ACM International Workshop on Grid Computing
Scientific Programming - Scientific Workflows
International Journal of High Performance Computing Applications
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Service-oriented workflow languages are being considered as a key programming paradigm for composing Grid applications from basic services. In this paper we present QoS support for grid workflows addressing the special requirements of time-critical Grid applications, as for example medical simulation services. QoS support for grid workflow is currently being developed in the context of the Vienna Grid Environment, a service-oriented Grid infrastructure for the provision of parallel simulation codes as QoS-aware Grid services, which are capable of dynamically negotiating with clients various QoS guarantees, e.g. with respect to execution time and price. We use a real world Grid service for medical image reconstruction to describe the main features of our approach and present the first prototype of a QoS-aware workflow engine which supports dynamic QoS negotiation and QoS-aware workflow execution.