| Description |
The Large Hadron Collider (LHC) experiments have designed, built and tested distributed computing systems capable of producing and processing an unprecedented amount of experimental data for analysis by thousands of physicists worldwide. We review the main challenges and milestones of the CMS Computing project in recent years, while deploying resources at an increasing scale on the Worldwide LHC Computing Grid (WLCG). The milestones are defined by the hierarchical design of the CMS computing model, including the centrally controlled tiered data processing, the data distribution in the large mesh of sites and the distributed data analysis by the physics community. We describe how dedicated data challenges addressed the milestones and we conclude by discussing the remaining goals in view of the LHC start-up.
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