ATLAS ONLINE MONITORING

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ATLAS ONLINE MONITORING
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Now what? How to check quality of the data?!!
FINISHED!
DATA FLOWS!
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Online MonitoringSurveillance of the data and
its quality

• Why monitor?
• To be able to discover in a relatively easy way
  that the detector is not behaving as it should
  and take action
• Examples detector modules that do not work,
  synchronization problems btw SCT and TRT,
  efficiencies sink ....

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OHP Monitoring display
SUBSCRIBE
DQM Monitoring display
UPDATE HISTO
I see tracks in the SCT!
(HISTOGRAM DISPLAY)?
OHP
PUBLISH
Tools for retrieving data from dataflow booking,
filling and publishing histograms
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Monitoring Scheme
Alarms notifications DQMF
Readout System
Intelligent Monitoring
Shifter displays OHP
ROB,ROS ,SFI,SFO,
Gatherer
LVL1
Var. Ref. DBS
Slow Ctrl. DBS
LVL2/EF
Display Experts
Tier 0
Archiver
Archiver
Monitoring DBS
Gatherer
Data Qual. DBS
Data Quelity Assessment
Calibration FARM
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Where and what is monitored

• Detector monitoring
• DCS detector hardware status and conditions
• Online Monitoring
• ROD Crate, ROS data quality and integrity
• Event Builder correlation between sub-detectors,
  consistency of LVL1 information
• Trigger Monitoring
• LVL1, LVL2 sample rejected events to check the
  trigger decision
• Event Filter information attached to a sub-set
  of accepted and rejected events
• DAQ monitoring
• ROS, EB operational monitoring (buffer
  occupancies, throughput, s/w and h/w status,
  errors, etc.)?

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Online Monitoring applications

• Online Histogram Presenter (OHP)?
• Atlas Data Quality Framework (DQMF)?
• Online Histogram Display (OH)?
• Trigger Monitoring

OH
OHP
DQM
Trigger
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Monitoring DisplaysOnline Histogram Presenter
(OHP)?

• OHP displays already existing histograms
• Displayed when histos are updated, i.e. when the
  detector is running and histos are published
• OHP subscribes to one or several histograms (or
  even all) and displays them online
• If the detector is not running a message will be
  displayed saying that no histogram is available

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Histograms - online monitoring

• Each detector or detector-subsystem expert has
  written tools for retrieving data from detector
  and filling histograms
• Global Inner Detector uses 7 tools for Athena PT
• Responsible Arshak Tonoyan Heidi Sandaker
• monitoring of LVL1, BCIDs
• matching of ID segments at TRT/SCT and SCT/Pixel
  boundary surface
• ID noise occupancies
• monitoring of no. of hits, residuals on combined
  tracks
• matching parameters of top and bottom tracks,
  SCTTRT
• extrapolation of SCT segments to TRT TRT straw
  efficiencies, residuals, no. of TRT hits on
  extrapolated track
• TRT straw efficiencies
• https//twiki.cern.ch/twiki/bin/view/Atlas/InDetGl
  obalMonitoring?topicIDGlobalMonitoring
• Produces many histograms available in Online
  Histogram Display only 10 allowed for each
  sub-detector in Online Histogram Presenter

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OHP
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OHP exampleSCT Hits for all tracks in the event
THE NUMBER OF HITS PER ALL TRACKS SHOULD
BE COMPARED WITH A REFERENCE HISTO
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SCT TRT exampleThe BCIDs of the SCT and TRT
VALUE IS 1 IF EVERYTHING IS OK THEN SCT TRT
ARE READING SAME EVENT!
DIFFERENT BCID BETWEEN SCT AND TRT - SOMETHING IS
WRONG
ROD ID
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Online display Data Quality Monitoring (DQM)?

• Automatic checks on data quality using predefined
  algorithms on histograms or counters etc.
• Input from Online Histogram Service
• Can also be done offline using ROOT files
• Puts flags or alarms if values are off expected
  limits or e.g. histograms are empty
• States are green, yellow, red
• States per subsystem but also overall state

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Milestone 6 (M6)Cosmic Run

• Global Inner Detector monitoring included for the
  first time
• Basic functionalities fully working
• Looked at the online histograms
• Did offline work reported results
• Work will continue to improve histograms what
  they display, how and which to choose

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CONCLUSIONS

• Monitoring is crucial for good data-taking
• Several monitoring applications exist and are
  working
• M6 was first time the Global Inner Detector was
  fully tested
• Doing shift-work really lets you learn a lot
  about ATLAS and the jungle of software that is
  out there....
• https//twiki.cern.ch/twiki/bin/view/Atlas/InDetGl
  obalMonitoring?topicIDGlobalMonitoring
• https//twiki.cern.ch/twiki/bin/view/Atlas/EventFi
  lterMonitoring
• https//twiki.cern.ch/twiki/bin/view/Atlas/AthenaP
  T
• http//atlas-tdaq-monitoring.web.cern.ch/atlas-tda
  q-monitoring/

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ACRONYMS

• TDAQ Trigger and Data Acquisition System
• HLT High Level Trigger
• EF Event Filter
• DF Data Flow software
• EDF Event Data Flow
• PT Processing Task
• ROD Read Out Driver
• ROS Read Out Subsystem
• RODC Read Out Driver Crate
• ROC Read Out Crate
• EMON Atlas Event Monitoring sampler system

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ACRONYMS

• Atlantis Atlas Standalone Event Display
• Athena Atlas Offline software framework
• DQM Data Quality Monitoring
• DQMF Atlas Data Quality Framework
• OH Online Histogramming service
• IS Information Service
• DCS Detector Control System
• SFI SubFarm Input
• SFO SubFarm Output
• DSP Digital Signal Processor
• OKS Object Kernel Support
• Library to support simple in-memoryobject
  manager. Suitable for real-timeobject manager for
  e.g. Data Acquisition