CMS DAQ Event Builder Based on Gigabit Ethernet

Bauer, Ulrich; Boyer,; Branson,; Brett,; Cano, Juan-Carlos; Carboni,; Ciganek,; Cittolin,; Erhan,; Gigi,; Glege,; Gomez-Reino,; Gulmini,; Mlot,; Gutleber,; Jacobs, Jacobs; Klute,; Lipeles,; Perez, Josep M.; Maron, G.; Meijers,; Meschi, E.; Moser,; Murray, Richard M.; Oh, Teresa; Orsini,; Paus,; Petrucci,; Pieri,; Pollet,; Racz,; Sakulin,; Sani,; Schieferdecker,; Schwick,; Sumorok,; Сузуки,; Tsirigkas,; Varela, J.

doi:10.1109/rtc.2007.4382750

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…An Event Manager (EVM) provides the flow control by steering the event building based on trigger information. The two-stage event building approach is described in detail in [4].…”

Section: Trigger and Daq General Architecturementioning

confidence: 99%

“…Only two trigger levels are employed in CMS: the Level-1 Trigger (L1T), implemented using custom electronics reduces the initial event rate by a factor of 100 [3] using custom electronics. Events accepted by the Level-1 are read-out and assembled by the DAQ Event Builder (EVB) [4]. The second trigger level, the High Level Trigger (HLT) analyzes complete CMS events at the Level-1 accept rate of 100 kHz.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The CMS High Level Trigger System: Experience and Future Development

Bauer

Behrens

Bowen

et al. 2012

J. Phys.: Conf. Ser.

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The CMS experiment at the LHC features a two-level trigger system. Events accepted by the first level trigger, at a maximum rate of 100 kHz, are read out by the Data Acquisition system (DAQ), and subsequently assembled in memory in a farm of computers running a software high-level trigger (HLT), which selects interesting events for offline storage and analysis at a rate of order few hundred Hz. The HLT algorithms consist of sequences of offline-style reconstruction and filtering modules, executed on a farm of 0(10000) CPU cores built from commodity hardware. Experience from the operation of the HLT system in the collider run 2010/2011 is reported. The current architecture of the CMS HLT, its integration with the CMS reconstruction framework and the CMS DAQ, are discussed in the light of future development. The possible short-and medium-term evolution of the HLT software infrastructure to support extensions of the HLT computing power, and to address remaining performance and maintenance issues, are discussed.

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“…An Event Manager (EVM) provides the flow control by steering the event building based on trigger information. The two-stage event building approach is described in detail in [4].…”

Section: Trigger and Daq General Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The CMS High Level Trigger System: Experience and Future Development

Bauer

Behrens

Bowen

et al. 2012

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…The full detector data (~1MB) corresponding to the events accepted by the L1T are read out by the DAQ system at a rate up to 100 kHz. The event building [6], i.e. the assembling of the event fragments coming from each detector front-end module, takes place in two stages.…”

Section: Trigger and Daq System Layoutmentioning

confidence: 99%

Commissioning of the CMS High Level Trigger

et al. 2009

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The CMS experiment will collect data from the proton-proton collisions delivered by the Large Hadron Collider (LHC) at a centre-of-mass energy up to 14 TeV. The CMS trigger system is designed to cope with unprecedented luminosities and LHC bunch-crossing rates up to 40 MHz. The unique CMS trigger architecture only employs two trigger levels. The Level-1 trigger is implemented using custom electronics, while the High Level Trigger (HLT) is based on software algorithms running on a large cluster of commercial processors, the Event Filter Farm. We present the major functionalities of the CMS High Level Trigger system as of the starting of LHC beams operations in September 2008. The validation of the HLT system in the online environment with Monte Carlo simulated data and its commissioning during cosmic rays data taking campaigns are discussed in detail. We conclude with the description of the HLT operations with the first circulating LHC beams before the incident occurred the

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Recent experience and future evolution of the CMS High Level Trigger System

Bauer

Behrens

Branson

et al. 2012

2012 18th IEEE-NPSS Real Time Conference

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The CMS experiment at the LHC uses a two-stage trigger system, with events flowing from the first level trigger at a rate of 100 kHz. These events are read out by the Data Acquisition system (DAQ), assembled in memory in a farm of computers, and finally fed into the high-level trigger (HLT) software running on the farm. The HLT software selects interesting events for offline storage and analysis at a rate of a few hundred Hz. The HLT algorithms consist of sequences of offline-style reconstruction and filtering modules, executed on a farm of 0(10000) CPU cores built from commodity hardware. Experience from the 2010-2011 collider run is detailed, as well as the current architecture of the CMS HLT, and its integration with the CMS reconstruction framework and CMS DAQ. The short-and medium-term evolution of the HLT software infrastructure is discussed, with future improvements aimed at supporting extensions of the HLT computing power, and addressing remaining performance and maintenance issues. Abstract-The CMS experiment at the LHC uses a two-stage trigger system, with events flowing from the first level trigger at a rate of 100 kHz. These events are read out by the Data Acquisition system (DAQ), assembled in memory in a farm of computers, and finally fed into the high-level trigger (HLT) software running on the farm. The HLT software selects interesting events for offline storage and analysis at a rate of a few hundred Hz. The HLT algorithms consist of sequences of offline-style reconstruction and filtering modules, executed on a farm of 0(10000) CPU cores built from commodity hardware. Experience from the 2010-2011 collider run is detailed, as well as the current architecture of the CMS HLT, and its integration with the CMS reconstruction framework and CMS DAQ. The short-and medium-term evolution of the HLT software infrastructure is discussed, with future improvements aimed at supporting extensions of the HLT computing power, and addressing remaining performance and maintenance issues.

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CMS DAQ Event Builder Based on Gigabit Ethernet

Cited by 3 publications

References 2 publications

The CMS High Level Trigger System: Experience and Future Development

The CMS High Level Trigger System: Experience and Future Development

Commissioning of the CMS High Level Trigger

Recent experience and future evolution of the CMS High Level Trigger System

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