Mar 21 – 27, 2009
Europe/Prague timezone

Software Validation Infrastructure for the ATLAS Trigger

Mar 26, 2009, 3:00 PM
Club (Prague)



Prague Congress Centre 5. května 65, 140 00 Prague 4, Czech Republic
oral Software Components, Tools and Databases Software Components, Tools and Databases


Wolfgang Ehrenfeld (DESY)


The ATLAS trigger system is responsible for selecting the interesting collision events delivered by the Large Hadron Collider (LHC). The ATLAS trigger will need to achieve a ~10-7 rejection factor against random proton-proton collisions, and still be able to efficiently select interesting events. After a first processing level based on hardware, the final event selection is based on custom software running on two CPU farms, containing around two thousand multi-core machines. This is known as the high-level trigger. Running the trigger online during long periods demands very high quality software. It must be fast, performant, and essentially bug-free. With more than 100 contributors and around 250 different packages, a thorough validation of the HLT software is essential. This relies on a variety of unit and integration tests as well as on software metrics, and uses both in-house and open source software. This paper describes the existing infrastructure used for validating the high-level trigger software, as well as plans for its future development.


This paper gives an overview of the procedures and infrastructure used in the ATLAS high level trigger to validate the selection and steering software before it goes online. The ATLAS high level trigger consists of around 250 different software packages, and has in addition many algorithmic and structural components in common with the offline ATLAS software framework. Quality assurance of this software is essential, due to its complexity and the critical nature of its use: online time is intrinsically very valuable and downtime needs to be minimized.

Primary author


Prof. Allen Mincer (Department of Physics, New York University, New York) Dr Andrea Coccaro (Dipartimento di Fisica dell' Universita di Genova e I.N.F.N., Genova) Dr Andrea Ventura (I.N.F.N. Lecce e Dipartimento di Fisica dell'Universita del Salento, Lecce) Mr Andreas Reinsch (University of Oregon, Eugene, Oregon) Dr Andrew Hamilton (Section de Physique, Universite de Geneve, Geneva) Dr Chihiro Omachi (Kobe University, Kobe) Dr Christopher Potter (Department of Physics, McGill University, Montreal) Dr Cristina Adorisio (Dipartimento di Fisica dell' Universita della Calabria e I.N.F.N., Cosenza) Mr Danilo Enoque Ferreira de Lima (Universidade Federal do Rio de Janeiro, COPPE/EE/IF, Rio de Janeiro) Prof. David Strom (University of Oregon, Eugene, Oregon) Dr Denis Damazio (Brookhaven National Laboratory (BNL), Upton, New York) Mr Diego Rodriguez (Universidad Antonio Narino, Bogota, Colombia) Dr Fernando Monticelli (Universidad Nacional de La Plata, La Plata) Mr Fernando Quinonez (Pontificia Universidad Catolica de Chile) Dr Frank Winklmeier (European Laboratory for Particle Physics (CERN), Geneva) Dr Jiri Masik (Department of Physics and Astronomy, University of Manchester, Manchester) Dr Julie Kirk (Rutherford Appleton Laboratory, Chilton, Didcot) Mr Long Zhao (Department of Physics, New York University, New York) Dr Mark Sutton (Department of Physics and Astronomy, University College London, London) Dr Michela Biglietti (Dipartimento di Scienze Fisiche, Università di Napoli 'Federico II' e I.N.F.N., Napoli) Dr Natalia Panikashvili (University of Michigan, Department of Physics, Ann Arbor, Michigan) Dr Nick Sinev (University of Oregon, Eugene, Oregon) Dr Olga Igonkina (Nikhef National Institute for Subatomic Physics, Amsterdam) Dr Paul Bell (Department of Physics and Astronomy, University of Manchester, Manchester) Dr Peter Faulkner (School of Physics and Astronomy, The University of Birmingham) Dr Pierre-Hugues Beauchemin (Beauchemin, P.) Dr Regina Kwee (Institut fuer Physik, Humboldt-Universitaet, Berlin) Dr Ricardo Jose Goncalo (Royal Holloway) Dr Simon George (Department of Physics, Royal Holloway and Bedford New College, Egham) Dr Stefan Ask (Department of Physics and Astronomy, University of Manchester, Manchester) Dr Valeria Perez-Reale (Nevis Laboratories, Columbia University New York) Wolfgang Ehrenfeld (DESY)

Presentation materials