Nov 4 – 8, 2019
Adelaide Convention Centre
Australia/Adelaide timezone

Network simulation of a 40 MHz event building system for the LHCb experiment

Nov 5, 2019, 12:15 PM
Riverbank R5 (Adelaide Convention Centre)

Riverbank R5

Adelaide Convention Centre

Oral Track 1 – Online and Real-time Computing Track 1 – Online and Real-time Computing


Flavio Pisani (Universita e INFN, Bologna (IT))


The LHCb experiment will be upgraded in 2021 and a new trigger-less readout system will be implemented. In the upgraded system, both event building (EB) and event selection will be performed in software for every collision produced in every bunch-crossing of the LHC. In order to transport the full data rate of 32 Tb/s we will use state of the art off-the-shelf network technologies, e.g. InfiniBand EDR.
The full event building system will require around 500 nodes interconnected together via a non blocking topology, because of the size of the system it very difficult to test at production scale, before the actual procurement. We resort therefore to network simulations as a powerful tool for finding the optimal configuration. We developed an accurate low level description of an InfiniBand based network with event building like traffic.
We will present a full scale simulation of a possible implementation of the LHCb EB network.

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Primary authors

Flavio Pisani (Universita e INFN, Bologna (IT)) Tommaso Colombo (CERN) Niko Neufeld (CERN) Umberto Marconi (Universita e INFN, Bologna (IT)) Rafal Dominik Krawczyk (CERN) Domenico Galli (Universita e INFN, Bologna (IT)) Rainer Schwemmer (CERN) Paolo Durante (CERN)

Presentation materials