GriddLeS Enhancements and Building Virtual Applications for the GRID with Legacy Components

The GriddLeS (Grid Enabling Legacy Software) middleware is a novel software layer that allows previously separate legacy applications to be coupled in a software workflow over the grid without any changes to the application source code. We have previously tested GriddLeS on a number of applications, including a small atmospheric sciences workflow in which weather and climate models are coupled. In this paper we describe a number of enhancements to the previous implementation [1][2] that improve its performance significantly. Specifically, the new implementation improves the performance when small blocks are written over high latency networks. The paper also describes a much larger atmospheric sciences workflow than previously reported, that couples multiple global climate models, regional weather models and pollution models in one virtual application.