Andrea Petrucci
(Univ. of California San Diego (US))
The event builder in the Data Acquisition System (DAQ) of the CMS experiment at the CERN Large Hadron Collider (LHC) is responsible for assembling events at a rate of 100 kHz during the current LHC run 3, and 750 kHz for the upcoming High Luminosity LHC, scheduled to start in 2029. Both the current and future DAQ architectures leverage on state-of-the-art network technologies, employing Ethernet switches capable of supporting RoCE protocols. The DAQ Front-end hardware is custom-designed, utilizing a reduced TCP/IP protocol implemented in FPGA for reliable data transport between custom electronics and commercial computing hardware.
An alternative architecture for the event builder, known as the File-based Event Builder (FEVB), is under evaluation. The FEVB comprises two separate systems: the Super-Fragment Builder (SFB) and the Builder File-based Filter Farm (BF3).
A super-fragment consists of the event data read by one or more Front-End Drivers and corresponding to the same L1 accept, and the SFB constructs multiple super-fragments corresponding to the number of Read-Unit (RU) machines in the DAQ system, storing them in local RAM disks. Subsequently, the BF3 accesses super-fragments from all RU machines via the Network File System (NFS) over Ethernet and builds complete events within the High Level Trigger process.
This paper describes the first prototype of the FEVB and presents preliminary performance results obtained within the DAQ system for LHC Run 3.
Andrea Petrucci
(Univ. of California San Diego (US))
Srecko Morovic
(Univ. of California San Diego (US))
Albert Corominas I Mariscot
(University of Girona UdG (ES))
Dr
Andrea Bocci
(CERN)
Antonin Dvorak
(CERN)
Antra Gaile
(Riga Technical University (LV))
Attila Racz
(CERN)
Babatunde John Odetayo
(University of Benin (NG))
Christian Deldicque
(CERN)
Christoph Paus
(Massachusetts Inst. of Technology (US))
Christoph Schwick
(CERN)
Christos Emmanouil
Cristina Vazquez Velez
(CERN)
Dainius Simelevicius
(Vilnius University (LT))
Dinyar Rabady
(CERN)
Dominique Gigi
(CERN)
Dr
Emilio Meschi
(CERN)
Eric Cano
(CERN)
Frank Glege
(CERN)
Frans Meijers
(CERN)
Georgiana Lavinia Darlea
(Massachusetts Inst. of Technology (US))
Guillelmo Gomez Ceballos Retuerto
(Massachusetts Inst. of Technology (US))
Guillermo Izquierdo Moreno
(CERN)
Hannes Sakulin
(CERN)
Jaafar Alawieh
(American University of Beirut (LB))
James Gordon Branson
(Univ. of California San Diego (US))
Jan Andrzej Bugajski
(AGH University of Krakow (PL))
Jeroen Hegeman
(CERN)
Kareen Arutjunjan
(CERN)
Kenneth Long
(Massachusetts Inst. of Technology (US))
Luciano Orsini
(CERN)
Marc Dobson
(CERN)
Marco Pieri
(Univ. of California San Diego (US))
Miguel Bacharov Durasov
(CERN)
Patrycja Ewa Gorniak
(CERN)
Petr Zejdl
(CERN)
Philipp Brummer
(CERN)
Polyneikis Tzanis
(CERN)
Rafal Dominik Krawczyk
(Rice University (US))
Sergio Cittolin
(Univ. of California San Diego (US))
Tejeswini Jayakumar
(CERN)
Theodoros Rizopoulos
(CERN)
Thomas Owen James
(CERN)
Ulf Behrens
(Rice University (US))
Wassef Karimeh
(CERN)
Wei Li
(Rice University (US))
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