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Xrootd and ALTAS Analysis support

Xrootd and ALTAS Analysis support. Doug Benjamin Duke University. Data types in Federation. In ATLAS most analysis use D3PD’s ( Ntuples ) Using Top group as an example – Produce dAOD’s from AOD’s Produce D3PD’s from AOD’s and/or dAOD’s

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Xrootd and ALTAS Analysis support

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  1. Xrootd and ALTAS Analysis support Doug Benjamin Duke University

  2. Data types in Federation • In ATLAS most analysis use D3PD’s (Ntuples) • Using Top group as an example – • Produce dAOD’s from AOD’s • Produce D3PD’s from AOD’s and/or dAOD’s • 100 dAOD events – 6563596 Bytes or 65 kB/event (Jet data) • 100 D3PD events – 2160646 Bytes or 21kB/event (Jet data) • 100 dAODevents – 9862432 Bytes or 93 kB/event (electron) • 100 D3PD events – 2845004 Bytes or 28 kB/event (electron) • Still some analysis work with AOD’s

  3. NTUP/D3PD analysis changing • Group D3PD’s quite large and general • Top NTUPLE > 3000 branches (was up to ~ 5000 branches) • Most people use 100-200 branches in an analysis • Efficient analyzers have learned to slim the ntuples down to a more manageable size • More and more ntuple activity will have to occur on the grid

  4. Challenges • People are actively doing analysis • Anything new must help them. • People will try something only if they personally see the benefit. • How will Xrootd federation help analysis? • What is the direction this federation is heading? • Slimed ntuples need organization and catorigation (meta data?)

  5. Is the nature of Xrootd federation changing? • Do we have two use cases? • Tier 1/ Tier 2 use case • Federation within Tier 2’s • Federation between collocated Tier 3 sites and Tier 1/ Tier 2 • Stand alone Tier 3 use case • How do we make the federation help to them? • Can federation help these sites be collocated

  6. How can US ATLAS Analysis Support Help? • Do we have enough “Standard Candles”? • What testing do we need to do? • How do we coordinate this with ATLAS wide activities? • Can we improve WAN performance for our D3PD’s • Could lead to Software changes • Data format changes • What tools are missing ? (organization)

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