The second stage will be a set of event builders called Readout Builders. These will be based on Myrinet technology and will pre-assemble groups of about 8 data sources. Events will be built in two stages: the first stage will be a set of event builders called FED Builders. ![]() Different architectures and switch technologies have been evaluated to accomplish this purpose. The CMS Data Acquisition System is designed to build and filter events originating from 476 detector data sources at a maximum trigger rate of 100 KHz. We report on the performance of the event builder system and the steps taken to exploit the full potential of the network technologies.ĬMS DAQ Event Builder Based on Gigabit Ethernetīauer, G Branson, J Brett, A Cano, E Carboni, A Ciganek, M Cittolin, S Erhan, S Gigi, D Glege, F Gómez-Reino, Robert Gulmini, M Gutiérrez-Mlot, E Gutleber, J Jacobs, C Kim, J C Klute, M Lipeles, E Lopez-Perez, Juan Antonio Maron, G Meijers, F Meschi, E Moser, R Murray, S Oh, A Orsini, L Paus, C Petrucci, A Pieri, M Pollet, L Rácz, A Sakulin, H Sani, M Schieferdecker, P Schwick, C Sumorok, K Suzuki, I Tsirigkas, D Varela, J A 56 Gb/s Infiniband FDR CLOS network has been chosen for the event builder. For the data concentration, 10/40 Gb/s Ethernet technologies are used together with a reduced TCP/IP protocol implemented in FPGA for a reliable transport between custom electronics and commercial computing hardware. ![]() The new DAQ architecture is based on state-of-the-art network technologies for the event building. The CMS DAQ system has been completely rebuilt during the first long shutdown of the LHC in 2013/14. It transports event data at an aggregate throughput of ~100 GB/s to the high-level trigger (HLT) farm. The data acquisition system (DAQ) of the CMS experiment at the CERN Large Hadron Collider (LHC) assembles events at a rate of 100 kHz. The first stage contains 64 switches performing a first level of data concentration by building super-fragments from fragmen.Īndre, Jean-Marc Olivier Branson, James Brummer, Philipp Maximilian Chaze, Olivier Cittolin, Sergio Contescu, Cristian Craigs, Benjamin Gordon Darlea, Georgiana Lavinia Deldicque, Christian Demiragli, Zeynep Dobson, Marc Doualot, Nicolas Erhan, Samim Fulcher, Jonathan Richard Gigi, Dominique Gladki, Maciej Szymon Glege, Frank Gomez Ceballos, Guillelmo Hegeman, Jeroen Guido Holzner, Andre Georg Janulis, Mindaugas Jimenez Estupinan, Raul Masetti, Lorenzo Meijers, Franciscus Meschi, Emilio Mommsen, Remigius Morovic, Srecko O'Dell, Vivian Orsini, Luciano Paus, Christoph Maria Ernst Petrova, Petia Pieri, Marco Racz, Attila Reis, Thomas Sakulin, Hannes Schwick, Christoph Simelevicius, Dainius Zejdl, Petr The event builder is organised into two stages with intelligent buffers in between. ![]() The architecture of the baseline CMS event builder will be outlined. Results from ongoing studies, including measurements on throughput and scaling are presented. In the case of Ethernet, protocols based on Layer-2 frames and on TCP/IP are evaluated. This paper describes studies of an EVB test-bench based on 64 PCs acting as data sources and data consumers and employing both Gigabit Ethernet and Myrinet technologies as the interconnect. Several architectures and switch technologies have been evaluated for the DAQ Technical Design Report by measurements with test benches and by simulation. The data acquisition system of the CMS experiment at the Large Hadron Collider will employ an event builder which will combine data from about 500 data sources into full events at an aggregate throughput of 100 GByte/s. Brigljevic, V Cano, E Cittolin, Sergio Csilling, Akos Gigi, D Glege, F Gómez-Reino, Robert Gulmini, M Gutleber, J Jacobs, C Kozlovszky, Miklos Larsen, H Magrans de Abril, Ildefons Meijers, F Meschi, E Murray, S Oh, A Orsini, L Pollet, L Rácz, A Samyn, D Scharff-Hansen, P Schwick, C Sphicas, Paris ODell, V Suzuki, I Berti, L Maron, G Toniolo, N Zangrando, L Ninane, A Erhan, S Bhattacharya, S Branson, J G
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