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Open access to high-level data and analysis tools in the CMS experiment at the LHC
/ Calderon Tazon, Alicia (Cantabria Inst. of Phys.) ; Colling, David (Imperial Coll., London) ; Huffman, Michael Adam James (Imperial Coll., London) ; Lassila-Perini, Katri (Helsinki Inst. of Phys.) ; McCauley, Thomas (Notre Dame U.) ; Rao, Achintya Mahesh (West England U.) ; Rodriguez Marrero, Ana Yaiza (Cantabria Inst. of Phys.) ; Sexton-Kennedy, Elizabeth (Fermilab)
/CMS Collaboration
The CMS experiment, in recognition of its commitment to datapreservation and open access as well as to education and outreach, hasmade its first public release of high-level data up to half of theproton-proton collision data at 7 TeV from 2010 in CMS Analysis ObjectData format. CMS has prepared, in collaboration with CERN and theother LHC experiments, an open data web portal based on Invenio. [...]
CMS-CR-2015-056.-
Geneva : CERN, 2015 - 8 p.
- Published in : J. Phys.: Conf. Ser. 664 (2015) 032027
Fulltext: PDF; IOP Open Access article: PDF;
In : 21st International Conference on Computing in High Energy and Nuclear Physics, Okinawa, Japan, 13 - 17 Apr 2015, pp.032027
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Prototype of a File-Based High-Level Trigger in CMS
/ Bauer, Gerry (MIT) ; Behrens, Ulf (DESY) ; Branson, James (UC, San Diego) ; Chaze, Olivier (CERN) ; Cittolin, Sergio (UC, San Diego) ; Coarasa Perez, Jose Antonio (CERN) ; Darlea, Georgiana Lavinia (MIT) ; Deldicque, Christian (CERN) ; Dobson, Marc (CERN) ; Dupont, Aymeric (CERN) et al.
The DAQ system of the CMS experiment at the LHC is upgraded during the
accelerator shutdown in 2013/14. To reduce the interdependency of the DAQ
system and the high-level trigger (HLT), we investigate the feasibility of
using a file-system-based HLT. [...]
CMS-CR-2013-380.-
Geneva : CERN, 2014 - 8 p.
- Published in : J. Phys.: Conf. Ser. 513 (2014) 012025
Fulltext: PDF;
In : 20th International Conference on Computing in High Energy and Nuclear Physics 2013, Amsterdam, Netherlands, 14 - 18 Oct 2013, pp.012025
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A scalable monitoring for the CMS Filter Farm based on elasticsearch
/ Andre, Jean-marc Olivier (Fermilab) ; Andronidis, Anastasios (Ioannina U.) ; Behrens, Ulf (DESY) ; Branson, James (UC, San Diego) ; Chaze, Olivier (CERN) ; Cittolin, Sergio (UC, San Diego) ; Darlea, Georgiana Lavinia (MIT) ; Deldicque, Christian (CERN) ; Dobson, Marc (CERN) ; Dupont, Aymeric (CERN) et al.
A flexible monitoring system has been designed for the CMS File-based Filter Farm making use of modern data mining and analytics components. All the metadata and monitoring information concerning data flow and execution of the HLT are generated locally in the form of small "documents" using the JSON encoding. [...]
CMS-CR-2015-060.-
Geneva : CERN, 2015 - 9 p.
- Published in : J. Phys.: Conf. Ser. 664 (2015) 082036
Fulltext: PDF; IOP Open Access article: PDF;
In : 21st International Conference on Computing in High Energy and Nuclear Physics, Okinawa, Japan, 13 - 17 Apr 2015, pp.082036
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4.
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A New Event Builder for CMS Run II
/ Albertsson, Kim (CERN) ; Andre, Jean-marc Olivier (Fermilab) ; Andronidis, Anastasios (Ioannina U.) ; Behrens, Ulf (DESY) ; Branson, James (UC, San Diego) ; Chaze, Olivier (CERN) ; Cittolin, Sergio (UC, San Diego) ; Darlea, Georgiana Lavinia (MIT) ; Deldicque, Christian (CERN) ; Dobson, Marc (CERN) et al.
The data acquisition system (DAQ) of the CMS experiment at the CERN Large Hadron Collider (LHC) assembles events at a rate of 100kHz, transporting event data at an aggregate throughput of 100GB/s to the high-level trigger (HLT) farm. The DAQ system has been redesigned during the LHC shutdown in 2013/14. [...]
CMS-CR-2015-063.-
Geneva : CERN, 2015 - 9 p.
- Published in : J. Phys.: Conf. Ser. 664 (2015) 082035
Fulltext: PDF; IOP Open Access article: PDF;
In : 21st International Conference on Computing in High Energy and Nuclear Physics, Okinawa, Japan, 13 - 17 Apr 2015, pp.082035
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Recent experience and future evolution of the CMS High Level Trigger System
/ Bauer, Gerry (MIT) ; Behrens, Ulf (DESY) ; Branson, James (UC, San Diego) ; Bukowiec, Sebastian Czeslaw (CERN) ; Chaze, Olivier (CERN) ; Cittolin, Sergio (UC, San Diego) ; Coarasa Perez, Jose Antonio (CERN) ; Deldicque, Christian (CERN) ; Dobson, Marc (CERN) ; Dupont, Aymeric (CERN) et al.
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. [...]
CMS-CR-2012-167.-
Geneva : CERN, 2012 - 6 p.
Fulltext: PDF;
In : 18th IEEE Real-Time Conference 2012, Berkeley, California, 11 - 15 Jun 2012
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6.
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The CMS High Level Trigger System: Experience and Future Development
/ Bauer, Gerry (MIT) ; Behrens, Ulf (DESY) ; Bowen, Matthew (CERN) ; Branson, James G (UC, San Diego) ; Bukowiec, Sebastian (CERN) ; Cittolin, Sergio (UC, San Diego) ; Coarasa, J A (CERN) ; Deldicque, Christian (CERN) ; Dobson, Marc (CERN) ; Dupont, Aymeric (CERN) et al.
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. [...]
CMS-CR-2012-147.-
Geneva : CERN, 2012 - 9 p.
- Published in : J. Phys.: Conf. Ser. 396 (2012) 012008
Fulltext: PDF;
In : Computing in High Energy and Nuclear Physics 2012, New York, NY, USA, 21 - 25 May 2012, pp.012008
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Controlled overflowing of data-intensive jobs from oversubscribed sites
/ Sfiligoi, Igor (UC, San Diego) ; Wuerthwein, Frank Karl (UC, San Diego) ; Bockelman, Brian Paul (Nebraska U.) ; Bradley, Daniel Charles (Wisconsin U., Madison) ; Tadel, Matevz (UC, San Diego) ; Bloom, Kenneth Arthur (Nebraska U.) ; Letts, James (UC, San Diego) ; Mrak Tadel, Alja (UC, San Diego)
The CMS analysis computing model was always relying on jobs running near the data, with data allocation between CMS compute centers organized at management level, based on expected needs of the CMS community. While this model provided high CPU utilization during job run times, there were times when a large fraction of CPUs at certain sites were sitting idle due to lack of demand, all while Terabytes of data were never accessed. [...]
CMS-CR-2012-069.-
Geneva : CERN, 2012 - 9 p.
- Published in : J. Phys.: Conf. Ser. 396 (2012) 032102
Fulltext: PDF;
In : Computing in High Energy and Nuclear Physics 2012, New York, NY, USA, 21 - 25 May 2012, pp.032102
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Tracker Operation and Performance at the Magnet Test and Cosmic Challenge
/ Abbaneo, Duccio (CERN) ; Albergo, Sebastiano ; Ambroglini, Filippo ; Azzi, Patrizia ; Bogelsbacher, F ; Bacchetta, Nicola ; Bainbridge, Robert ; Barvich, Tobias ; Basti, Andrea ; Beaulieu, G et al.
During summer 2006 a fraction of the CMS silicon strip tracker was operated in a comprehensive slice test called the Magnet Test and Cosmic Challenge (MTCC). At the MTCC, cosmic rays detected in the muon chambers were used to trigger the readout of all CMS sub-detectors in the general data acquisition system and in the presence of the 4 T magnetic field produced by the CMS superconducting solenoid. [...]
CMS-NOTE-2007-029.-
Geneva : CERN, 2007 - 52 p.
Fulltext: PDF;
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10.
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Design, Performance, and Calibration of CMS Hadron Endcap Calorimeters
/ CMS HCAL Collaboration
Detailed measurements have been made with the CMS hadron calorimeter endcaps (HE) in response to beams of muons, electrons, and pions. Readout of HE with custom electronics and hybrid photodiodes (HPDs) shows no change of performance compared to readout with commercial electronics and photomultipliers. [...]
CMS-NOTE-2008-010.-
Geneva : CERN, 2008 - 36 p.
Fulltext: PDF;
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