| Preprint | |
| Report number | FERMILAB-CONF-18-657-E |
| Title | The CMS Event-Builder System for LHC Run 3 (2021-23) |
| Author(s) | André, Jean-Marc (Fermilab) ; Behrens, Ulf (DESY) ; Branson, James (UC, San Diego) ; Brummer, Philipp (CERN ; KIT, Karlsruhe) ; Cittolin, Sergio (UC, San Diego) ; Da Silva Gomes, Diego (CERN) ; Darlea, Georgiana-Lavinia (MIT) ; Deldicque, Christian (CERN) ; Demiragli, Zeynep (MIT) ; Dobson, Marc (CERN) ; Doualot, Nicolas (Fermilab) ; Erhan, Samim (Cal State, L.A.) ; Fulcher, Jonathan (CERN) ; Gigi, Dominique (CERN) ; Gładki, Maciej (CERN) ; Glege, Frank (CERN) ; Gomez-Ceballos, Guillelmo (MIT) ; Hegeman, Jeroen (CERN) ; Holzner, André (UC, San Diego) ; Lettrich, Michael (CERN) ; Mecionis, Audrius (Fermilab ; Vilnius U.) ; Meijers, Frans (CERN) ; Meschi, Emilio (CERN) ; Mommsen, Remigius K (Fermilab) ; Morovic, Srecko (Fermilab) ; O'Dell, Vivian (Fermilab) ; Orsini, Luciano (CERN) ; Papakrivopoulos, Ioannis (Natl. Tech. U., Athens) ; Paus, Christoph (MIT) ; Petrucci, Andrea (Rice U.) ; Pieri, Marco (UC, San Diego) ; Rabady, Dinyar (CERN) ; Rácz, Attila (CERN) ; Rapševicius, Valdas (Fermilab ; Vilnius U.) ; Reis, Thomas (CERN) ; Sakulin, Hannes (CERN) ; Schwick, Christoph (CERN) ; Šimelevicius, Dainius (CERN ; Vilnius U.) ; Stankevicius, Mantas (Fermilab ; Vilnius U.) ; Velez, Cristina Vazquez (CERN) ; Wernet, Christian (CERN) ; Zejdl, Petr (Fermilab ; CERN) |
| Publication | 2018 |
| Imprint | 2018-11-07 |
| Number of pages | 8 |
| Presented at | XXXIX International Conference on High Energy Physics, Seoul, Korea, 4 - 11 Jul 2018 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| Abstract | The data acquisition system (DAQ) of the CMS experiment at the CERN Large Hadron Collider (LHC) assembles events of 2MB at a rate of 100 kHz. The event builder collects event fragments from about 750 sources and assembles them into complete events which are then handed to the highlevel trigger (HLT) processes running on O(1000) computers. The aging eventbuilding hardware will be replaced during the long shutdown 2 of the LHC taking place in 2019/20. The future data networks will be based on 100 Gb/s interconnects using Ethernet and Infiniband technologies. More powerful computers may allow to combine the currently separate functionality of the readout and builder units into a single I/O processor handling simultaneously 100 Gb/s of input and output trac. It might be beneficial to preprocess data originating from specific detector parts or regions before handling it to generic HLT processors. Therefore, we will investigate how specialized coprocessors, e.g. GPUs, could be integrated into the event builder. We will present the envisioned changes to the event-builder compared to today’s system. Initial measurements of the performance of the data networks under the event-building trac pattern will be shown. Implications of a folded network architecture for the event building and corresponding changes to the software implementation will be discussed. Corresponding author: [email protected] |
| Other source | Inspire |
Record creato 2022-09-13, modificato l'ultima volta il 2022-09-13
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