./ These are the search results for the query, showing results 1 to 3. publications/webpublishedreference.2009-08-13.3041121502 No publisher lavanya 2009-11-03T20:24:59Z Webpublished Reference publications/inproceedingsreference.2008-05-12.0553307621 Scientific applications have diverse characteristics and resource requirements. When combined with the complexity of underlying distributed resources on which they execute (e.g. Grid, cloud computing), these applications can experience significant performance fluctuations as machine reliability varies. Although the performance and reliability of cluster and Grid systems have been studied separately, there has been little analysis of the lost Quality of Service (QoS) experienced with varying availability levels. To enable a dynamic environment that can account for such changes while providing required QoS, next generation tools will need extensible application interfaces that allow users to qualitatively express performance and reliability requirements for the underlying systems. In this paper, we use the  concept of performability to capture the degraded performance that might result from varying resource availability. We apply the resulting model to workflow planning and fault tolerance strategies. We present experimental data to validate our model and use simulation results driven by failure data from real HPC systems to demonstrate how the proposed scheme better accounts for resource availability. No publisher lavanya 2008-05-15T21:10:15Z Inproceedings Reference Members/lavanya No publisher lavanya 2008-01-11T02:05:11Z Folder