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Lookup NU author(s): Dr James Smith, Professor Paul WatsonORCiD
This paper is concerned with the adaptive execution of workflows on a resources consisting of a pool of machines and a pool of alternative web services. The hierarchical nature of workflows enables adaptation at multiple levels. In this work, adaptivity is concerned with changing the mapping of services to machines and workflow invocations to services, in order to meet the requirements of both user and provider. Specifically, a third-party workflow engine (ActiveBPEL) has been wrapped to support mapping at these two levels. Results are presented for experiments within a cluster of machines which demonstrate a benefit from adapting in response to changes of user load and to changes in the pool of alternative services available during a workload. The experiments include a range of adaptivity scenarios and show that, by selection of an appropriate policy, a significant gain can be made.
Author(s): Smith J, Watson P
Publication type: Report
Publication status: Published
Series Title: School of Computing Science Technical Report Series
Year: 2007
Pages: 14
Print publication date: 01/07/2007
Source Publication Date: July 2007
Report Number: 1039
Institution: School of Computing Science, University of Newcastle upon Tyne
Place Published: Newcastle upon Tyne
URL: http://www.cs.ncl.ac.uk/publications/trs/papers/1039.pdf
