https://doi.org/10.1051/epjconf/202024501012
Network simulation of a 40 MHz event building system for the LHCb experiment
1
Alma Mater Studiorum – Università di Bologna, Bologna, Italy
2
Istituto Nazionale di Fisica Nucleare – INFN, Sez. di Bologna, Bologna, Italy
3
CERN, Geneva, Switzerland
* e-mail: flavio.pisani@cern.ch
Published online: 16 November 2020
The LHCb experiment will be upgraded in 2021, and a new triggerless 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 is challenging to test at production scale, before the actual procurement. Therefore, we resort 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.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
