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- W2895535192 abstract "LHCb is one of the four high energy physics experiments currently in operation at the LargeHadron Collider at CERN, Switzerland. After a successful first running period (Run1 from 2011to 2013), the LHC just entered the second exploitation phase (Run2, 2015-2018).The technical break between these two running periods, known as Long Shutdown 1 (LS1), wasthe opportunity for LHCb to adapt, among other area of development, its data acquisition andcomputing models.The operational changes on the data acquisition aspect include a clear split of the High LevelTrigger (HLT) software in two distinct entities, running in parallel and in an asynchronous modeon the filtering farm, allowing a higher output rate to the final offline storage for further physicsanalysis. A very challenging and innovative system performing full calibration and reconstructionin real time has been put in place. Thanks to this system, a fraction of the output of the HLT canbe used directly for physics, without any intermediate step: this output is named “Turbo stream”.Many changes were operated on the offline computing side as well. Besides the use of more modernand/or more scalable tools for the pure data management aspect, the computing model itselfand the processing workflow were revisited in order to cope with the increased load and amount ofdata. The new Turbo stream requires new operational management compared to the other “standard”streams. The clear separation between the different levels of Tiers (0, 1 and 2) has beenabandoned for a more flexible, dynamic and efficient “Mesh” processing model, in which any sitecan process data stored at any other site. Validation and probing procedures were established andautomatized before the start of massive Monte Carlo Simulation. This paper presents the changesthat were operated, and gives some feedback on their usage during the running period in 2015" @default.
- W2895535192 created "2018-10-12" @default.
- W2895535192 creator A5023553875 @default.
- W2895535192 date "2017-01-11" @default.
- W2895535192 modified "2023-09-26" @default.
- W2895535192 title "LHCb experience during the LHC 2015 run" @default.
- W2895535192 doi "https://doi.org/10.22323/1.270.0003" @default.
- W2895535192 hasPublicationYear "2017" @default.
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