The LHCb collaboration has redesigned its trigger to enable the full offline detector reconstruction to be performed in real time. Together with the real-time alignment and calibration of the detector, and a software infrastructure to make persistent the high-level physics objects produced during real-time processing, this redesign enabled the widespread deployment of real-time analysis during Run 2. We describe the design of the Run 2 trigger and real-time reconstruction, and present data-driven performance measurements for a representative sample of LHCb's physics programme. K: Performance of High Energy Physics Detectors; Trigger concepts and systems (hardware and software); Large detector-systems performance; Trigger algorithms A X P : 1812.10790 2019 JINST 14 P04013 6.8.2 Muon and dimuon trigger lines 32 6.8.3 Exclusive and calibration trigger lines 33 6.8.4 Low multiplicity event trigger lines 34 6.8.5 HLT2 bandwidth division 35 7 Conclusions 36

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The LHCb (Large Hadron Collider beauty) experiment is designed to study differences between particles and anti-particles as well as very rare decays in the charm and beauty sector of the standard model at the LHC. With the major upgrade done in view of Run 3, the detector will read-out all events at the full LHC bunch-crossing frequency of 40 MHz. The LHCb data acquisition system will be subject to a considerably increased data rate, reaching a peak of 40 Tb/s. The second stage of the two-stage filtering consists of more than 10000 multithreaded processes which simultaneously write output files at an aggregated band-width of 100 Gb/s. At the same time, a small number of file-moving processes will read files from the same storage to copy them over to tape-storage. This whole mechanism must run reliably over months and be able to cope with significant fluctuations. Moreover, for cost reasons, it must be built from off-the-shelf components. In this paper we describe LHCb's solution to this challenge. We show the design, present reasons for the design choices, the configuration and tuning of the adopted software solution, and present performance figures.

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