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International Lattice Data Grid

International Lattice Data Grid. Richard Kenway University of Edinburgh. lattice QCD. computer simulation of the strong force necessary to seek new physics which might hold clues to the Theory of Everything national projects using Tflops computers generating TByte data sets

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International Lattice Data Grid

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  1. International Lattice Data Grid Richard Kenway University of Edinburgh

  2. lattice QCD • computer simulation of the strong force • necessary to seek new physics which might hold clues to the Theory of Everything • national projects using Tflops computers generating TByte data sets • riding exponential technology curves • towards petascale Richard Kenway

  3. virtual organisation • grand vision • shared primary data • shared codes • shared machines • reality • Australia, Europe, Japan and US, led by UKQCD • focus on data sharing • grid of grids • connect existing data repositories using web services • provide a single public web interface • metadata • QCDML and data binding • draft standard XML schema for primary data Richard Kenway

  4. browser physics Xpath query history LFN eXist XML database software LFN data LFN physics search Globus 2.x replica catalogue data data LFN UK QCDgrid QCDML Tier 3 Edinburgh RAL Linux PC + RAID Liverpool “QCDOC” Tier 2 Swansea Tier 1 ILDG via SRM Richard Kenway

  5. QCDgrid operational model • control thread • checks disk space available on each node • maintains geographically separated copies of each file • moves each file closest to its point of use • can be transferred to another node • replica catalogue • tracks number and location of file instances Richard Kenway

  6. QCDML • minimal set of XML elements for exchanging primary lattice data • physics parameters • QCDML glossary documents on the web for algorithm, implementation and physics details • extensible to other data schema instance document <plaquette_gauge_action> <plaquette_operator> <field>link_gluon</field> <coupling> <beta> 5.2 </beta> </coupling> </plaquette_operator> <plaquette_gauge_action> Richard Kenway

  7. contributor format A standard format user format B BinX description of format A conversion tool data format strategy • BinX is an XML schema to describe binary file format developed by the eDIKT project • allows data binding C library (provided by contributor) to read data into standard format convert it to user's format if necessary OR BinX description of format B Richard Kenway

  8. a query using the metadata browser view the XML click get data Richard Kenway

  9. grid of grids • QCDgrid and JLab are running SRM v.1 as an interface • SOAP based XML protocol • JLab JAVA browser as a GUI for web services • today • can listQCDgrid and JLab LFNs as an aggregation of the replica catalogues • next steps • include Japan’s CP-PACS data • establish trust network of Certification Authorities or ILDG CA • increase functionality of the SRM • interact with the metadata Richard Kenway

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