Computing Model of the Upgrade LHCb experiment

This document describes the computing model of the LHCb Upgrade, which will start operations in LHC Run 3. The LHCb Upgrade will have a signal yield per unit time approximately ten times higher than that of the current experiment, and pileup will increase by roughly a factor of six. However, the computing resource requirements are mitigated by the novel real-time data processing model that is being introduced and use of faster simulation techniques. Significant elements of these new strategies have already been tested, albeit at a reduced scale, in Run 2. This document presents the computing resources requirements of the LHCb Upgrade during LHC Run 3 and beyond, and the model for the utilisation of the distributed computing infrastructure available to the experiment.