Usecase Dynamo Moderate Requirements: Modelling the turbulent dynamo in planets, stars and galaxies (solving the induction equation with turbulent electromotive force) Moderate Requirements: some MB to few GB main memory, <= 10 GB of local disk space Runtime: hours to days, Fortran90 code Handling of plain files only Concurrent start of multiple simulations with different input parameters

Preparation of Taskfarming One directory for each model containing input parameter files and the executable Job Description (XML file including data location and names of compute resources)

Status requests & monitoring: Start Taskfarming Submit Multi-Job globusrun-ws –submit -b –f job.xml –J –S –o epr.xml Status requests & monitoring: globusrun-ws –status –j epr.xml globusrun-ws –monitor –s –j epr.xml

Multi-Job Flowchart User Grid Resource grid- proxy- init Submit Multi- XML Multi-Job Description Accept Dele- gate 1. Job N. Job single File Stage-In Single-Job Descriptions Execute Task Stage- Out Input Data 1 Deliver Data & Request Files Send Files Output Clean Up Save Send Output Files N Handle Status Info Provide Monitoring EPR Request