Oct 10 – 14, 2016
San Francisco Marriott Marquis
America/Los_Angeles timezone

Performance of the CMS Event Builder

Oct 13, 2016, 3:30 PM
1h 15m
San Francisco Marriott Marquis

San Francisco Marriott Marquis

Poster Track 1: Online Computing Posters B / Break


Remi Mommsen (Fermi National Accelerator Lab. (US))


The data acquisition system (DAQ) of the CMS experiment at the CERN Large Hadron Collider (LHC) assembles events at a rate of 100 kHz. It transports event data at an aggregate throughput of ~100 GB/s to the high-level trigger (HLT) farm. The CMS DAQ system has been completely rebuilt during the first long shutdown of the LHC in 2013/14. The new DAQ architecture is based on state-of-the-art network technologies for the event building. 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. A 56 Gb/s Infiniband FDR CLOS network has been chosen for the event builder. We report on the performance of the event builder system and the steps taken to exploit the full potential of the network technologies.

Primary Keyword (Mandatory) DAQ
Secondary Keyword (Optional) Network systems and solutions

Primary author

Remi Mommsen (Fermi National Accelerator Lab. (US))


Andre Georg Holzner (Univ. of California San Diego (US)) Attila Racz (CERN) Ben Craigs (University of Northumbria (GB)) Christian Deldicque (CERN) Christoph Paus (Massachusetts Inst. of Technology (US)) Christoph Schwick (CERN) Cristian Contescu (Fermi National Accelerator Lab. (US)) Dainius Simelevicius (Vilnius University (LT)) Dominique Gigi (CERN) Emilio Meschi (CERN) Frank Glege (CERN) Frans Meijers (CERN) Georgiana Lavinia Darlea (Massachusetts Inst. of Technology (US)) Guillelmo Gomez Ceballos Retuerto (Massachusetts Inst. of Technology (US)) Hannes Sakulin (CERN) James Gordon Branson (Univ. of California San Diego (US)) Jean-Marc Olivier Andre (Fermi National Accelerator Lab. (US)) Jeroen Hegeman (CERN) Jonathan Fulcher (CERN) Lorenzo Masetti (CERN) Luciano Orsini (CERN) Marc Dobson (CERN) Marco Pieri (Univ. of California San Diego (US)) Nicolas Doualot (Fermi National Accelerator Lab. (US)) Olivier Chaze (CERN) Petr Zejdl (Fermi National Accelerator Lab. (US)) Philipp Maximilian Brummer (University of Applied Sciences (DE)) Raul Jimenez Estupinan (Eidgenoessische Tech. Hochschule Zuerich (CH)) Samim Erhan (Univ. of California Los Angeles (US)) Sergio Cittolin (Univ. of California San Diego (US)) Srecko Morovic (CERN) Thomas Reis (CERN) Ulf Behrens (Deutsches Elektronen-Synchrotron (DE)) Vivian O'Dell (Fermi National Accelerator Laboratory (FNAL)) Zeynep Demiragli (Massachusetts Inst. of Technology (US))

Presentation materials