Real-Time Dispatcher support for A Toroidal LHC ApparatuS (a part of the Large Hadron Collider)

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Real-Time Dispatcher support for A Toroidal LHC
ApparatuS (a part of the Large Hadron Collider)

• Jan Pieczykolan1, Lukasz Dutka1, Krzysztof
  Korcyl2, Tomir Kryza1,3 and Jacek Kitowski1,3
• 1ACC Cyfronet AGH
• 2Institute of Nuclear Physics Polish Academy of
  Sciences
• 3Univeristy of Science and Technology AGH

int.eu.grid meeting, Lisbon 12-15.XI.2007
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Outline

• The ATLAS project (int.eu.grid perspective)
• Idea behind RTD
• HEP High Energy Physics
• Demo

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The ATLAS experiment

• 1800 physics
• 150 universities and laboratories
• 34 countries
• Launch date - 2007

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Basic application informations

• Final users
• physics
• accelerator operators
• scientists in general
• HEP activity
• an offer of an extra computational power
• Result
• increase of a number of processed events from
  accelerator

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How to use it

• In fact, ATLAS has a GUI )
• HEP application is at the bottom of the ATLAS
• The user doesnt see it
• ATLAS is used in a typical way
• Grid interaction
• The user has to prepare a pool of available jobs
  on worker nodes HEP Portal

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The ATLAS-HLT project
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High Level Trigger

• High frequency of incoming data events (chunks)
  that should be computed
• On-line processing
• Stream processing
• Computation timeout
• Events stream
• Frequency about 3500 Hz
• Size about 2 MB

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Idea behind RTD
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High Energy Physics
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Possible problems

• Technical issues
• Integration with HEP Portal
• Integration with Monitoring
• Essential problems
• Optimal choice of processing (worker) node
• CPU/RAM/Network utilization
• Optimal choice of number of concurrent workers

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TODO

• Experiments with optimal selection of worker
  nodes
• What WN parameters should be checked
• Dynamic change of worker nodes
• Presentation at CERN
• End of november 2007

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Evaluation

• Demo

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Thank you!