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The High Energy Physics Experiment H1 [1] at Hadron-Electron Ring Accelerator (HERA) at DESY [2] is now in the era of high precision analyses based on the final and complete data sample. A natural consequence of this is the huge increase in the requirement for simulated Monte Carlo (MC) events. As a response to this increase, a framework for large scale MC production using the LCG Grid Infrastructure was developed. After 3 years of development the H1 MC Computing Framework has become a platform of high performance, reliability and robustness, operating on the top of the gLite infrastructure. The original framework has been expanded into a tool which can handle 600 million simulated MC events per month and 20,000 simultaneously supported jobs on the LHC Grid, at the same time decreasing operator effort to a minimum. An annual MC event production rate of over 2.5 billion events has been achieved, and the project is integral to the physics analysis performed by H1. Tools have also been developed, which allow modifications both of the H1 detector details, of the different levels of the MC production steps and which permit full monitoring of the jobs on the Grid sites. Based on the experience gained during the successful MC simulation, the H1 MC Framework is described. Also addressed are reasons for failures, deficiencies, bottlenecks and scaling boundaries as observed during this full scale physics analysis endeavor. The found solutions can easily be implemented by other experiments, and not necessarily only those devoted to HEP.

Monte Carlo Production on the Grid by the H1 Collaboration