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Online testbench for LHCb High Level Trigger validation

The High Level Trigger (HLT) and Data Acquisition (DAQ) system selects about 2 kHz of events out of the 40 MHz of beam crossings. The selected events are consolidated into files on an onsite storage and then sent to permanent storage for subsequent analysis on the Grid. For local and full-chain test...

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Detalles Bibliográficos
Autores principales: Frank, M, Garnier, J, Gaspar, C, Liu, G, Neufeld, N, Varela, A S
Lenguaje:eng
Publicado: 2010
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1742-6596/219/2/022008
http://cds.cern.ch/record/1269931
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author Frank, M
Garnier, J
Gaspar, C
Liu, G
Neufeld, N
Varela, A S
author_facet Frank, M
Garnier, J
Gaspar, C
Liu, G
Neufeld, N
Varela, A S
author_sort Frank, M
collection CERN
description The High Level Trigger (HLT) and Data Acquisition (DAQ) system selects about 2 kHz of events out of the 40 MHz of beam crossings. The selected events are consolidated into files on an onsite storage and then sent to permanent storage for subsequent analysis on the Grid. For local and full-chain tests a method to exercise the data-flow through the High Level Trigger when there are no actual data is needed. In order to test the system as much as possible under identical conditions as for data-taking the solution is to inject data at the input of the HLT at a minimum rate of 2 kHz. This is done via a software implementation of the trigger system which sends data to the HLT. The application has to simulate that the data it sends come from real LHCb readout-boards. Both simulation data and previously recorded real data can be re-played through the system in this manner. As the data rate is high (100 MB/s), care has been taken to optimise the emulator for throughput from the Storage Area Network (SAN). The emulator can be run in stand-alone mode or run as a pseudo-subdetector of LHCb, allowing for use of all the standard run-control tools. The architecture, implementation and performance of the emulator will be presented
id cern-1269931
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2010
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spelling cern-12699312022-08-17T13:25:14Zdoi:10.1088/1742-6596/219/2/022008http://cds.cern.ch/record/1269931engFrank, MGarnier, JGaspar, CLiu, GNeufeld, NVarela, A SOnline testbench for LHCb High Level Trigger validationComputing and ComputersThe High Level Trigger (HLT) and Data Acquisition (DAQ) system selects about 2 kHz of events out of the 40 MHz of beam crossings. The selected events are consolidated into files on an onsite storage and then sent to permanent storage for subsequent analysis on the Grid. For local and full-chain tests a method to exercise the data-flow through the High Level Trigger when there are no actual data is needed. In order to test the system as much as possible under identical conditions as for data-taking the solution is to inject data at the input of the HLT at a minimum rate of 2 kHz. This is done via a software implementation of the trigger system which sends data to the HLT. The application has to simulate that the data it sends come from real LHCb readout-boards. Both simulation data and previously recorded real data can be re-played through the system in this manner. As the data rate is high (100 MB/s), care has been taken to optimise the emulator for throughput from the Storage Area Network (SAN). The emulator can be run in stand-alone mode or run as a pseudo-subdetector of LHCb, allowing for use of all the standard run-control tools. The architecture, implementation and performance of the emulator will be presentedoai:cds.cern.ch:12699312010
spellingShingle Computing and Computers
Frank, M
Garnier, J
Gaspar, C
Liu, G
Neufeld, N
Varela, A S
Online testbench for LHCb High Level Trigger validation
title Online testbench for LHCb High Level Trigger validation
title_full Online testbench for LHCb High Level Trigger validation
title_fullStr Online testbench for LHCb High Level Trigger validation
title_full_unstemmed Online testbench for LHCb High Level Trigger validation
title_short Online testbench for LHCb High Level Trigger validation
title_sort online testbench for lhcb high level trigger validation
topic Computing and Computers
url https://dx.doi.org/10.1088/1742-6596/219/2/022008
http://cds.cern.ch/record/1269931
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