Experiences in the Gridification of the Geant4 Toolkit in the WLCG/EGEE Environment

The general patterns observed in supporting the Geant4 application in the EGEE infrastructure are discussed. Regression testing of Geant4 public releases is in the focus of this paper. Geant4 is a toolkit for the Monte Carlo simulation of the interaction of particle with matter, used by a wide field of research, including high energy and nuclear physics and also medical, accelerator and space physics studies. The support required for the release regression testing of Geant4 toolkit, including setting up of the new, official Virtual Organization in the EGEE, is explained. Recent developments of automatic regression testing suites and the benefits of the optimization layer above the standard Grid infrastructure are presented