May 14 – 16, 2014
University of Pennsylvania
US/Eastern timezone

Event building and reconstruction at 30 MHz using a CPU farm

May 15, 2014, 5:00 PM
25' presentation + 5' for discussion

25' presentation + 5' for discussion

Oral presentation


Umberto Marconi (INFN Bologna)


The upgrade of the LHCb detector relies on the ability to perform a full detector readout and event building at the LHC inelastic collision rate of 30 MHz, corresponding to a data rate of approximately 2.4 TB/s. We describe a novel uniform event builder architecture, based around a farm of commercial PCs linked by a bidirectional network, which fulfils this requirement in a cost effective way. We furthermore demonstrate that the event building itself can be performed while taking up only a small fraction of the computing power of this farm, while the rest is available to perform the earliest stages of event reconstruction and classification. We discuss the kinds of reconstructions which can be deployed in this farm and their uses in classifying the LHCb upgrade events with reference to several key physics benchmarks of the LHCb upgrade.

Primary authors

Beat Jost (CERN) Gerhard Raven (Natuurkundig Laboratorium-Vrije Universiteit (VU)-Unknown) Johannes Albrecht (Technische Universitaet Dortmund (DE)) Niko Neufeld (CERN) Rainer Schwemmer (CERN) Umberto Marconi (INFN Bologna) Vladimir Gligorov (CERN)

Presentation materials