The ATLAS Event Picking Service and Its Evolution
E. Alexandrov, I. N. Aleksandrov, Dario Barberis, Luca Canali, E. Cherepanova, Elizabeth Jean Gallas, S. González de la Hoz, F. Prokoshin, G. Rybkin, José Salt Cairols, Javier Sanchez, Miguel Villaplana Pérez, Alex Yakovlev · Physics of Particles and Nuclei · 2024
Abstract The EventIndex is the complete catalogue of all ATLAS real and simulated events, keeping the references to all permanent files that contain a given event in any processing stage; its implementation has been substantially revised in advance of LHC Run 3 to be able to scale to the higher production rates. The Event Picking Server automates the procedure of finding the locations of large numbers of events, extracting and collecting them into separate files. It supports different formats of events and has an elastic workflow for different input data. The convenient graphical interface of the Event Picking Server is integrated with ATLAS SSO. The monitoring system controls the performance of all parts of the service.