Showing papers by "Ivona Brandic published in 2005"

QoS support for time-critical grid workflow applications

Abstract: Time critical grid applications as for example simulations for medical surgery or disaster recovery have special quality of service requirements. The Vienna Grid Environment, developed and evaluated in the context of the EU Project GEMSS, facilitates the provision of HPC applications as QoS-aware grid services by providing support for dynamic negotiation of various QoS guarantees like required execution time and price. In this paper, we extend the QoS mechanisms offered by the Vienna Grid Environment to workflow applications. We describe QoS extensions of the business process execution language and present a first prototype of a corresponding QoS-aware workflow engine which implements different strategies in order to bind the tasks of a workflow to adequate grid services subject to user-specified QoS constraints. We present different grid workflow planning approaches as well as first experimental results

Towards quality of service support for grid workflows

Abstract: 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.