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dPROOF Implementation on the Grid: Insights and Progress Update

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This document presents an overview of the ongoing development of dPROOF, which integrates PROOF with AliEn for interactive parallel analysis on distributed clusters. The system operates using a multi-master architecture across various sites, including CERN, GSI, and CNAF. The process involves a series of interconnected ProxyClients and ProxyServers utilizing Xrootd. Key features include seamless user workspace integration, stress testing with a peak processing rate of 400MB/s, and testing at multiple Grid sites. Continuous improvements and adaptations for the ALICE collaboration are also discussed.

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dPROOF Implementation on the Grid: Insights and Progress Update

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  1. PROOF on the Grid Marco MEONI CERN - Offline Week – 28.10.2009

  2. dPROOF distributed PROOF is an ongoing development A combination of PROOF and AliEn…… to achieve interactive parallel analysis on distributed clusters exploiting data locality Grid Site C Grid Site A Grid Site B

  3. A ProxyServer starts Xrootd and PROOF master • JAs are sent to the VOs and start ProxyClients • A ProxyClient starts an Xrootd server and registers to the ProxyServer • A ProxyServer keeps the list of all the partecipating nodes • A user starts a dPROOF session connecting the topMaster 1 User workspace 2 AliEn-LCG Grid 3 Grid API ROOT AliEn-LCG WMS 4 5 5 PROOFtopMaster 1 VO-box 1 VO-box n VO-box m ProxyServer Xrootdmanager PROOFlocalMaster 4 2 3 ProxyClient JA WN1 WN2 WNn Xrootd server PROOFworker WN workspace Site workspace

  4. Execution (CERN)

  5. Execution (GSI)

  6. Participating Sites http://pcalimonitor/dproof/ • CNAF (by the end of the week) • Kosice • NIHAM 4 steps to enable dPROOF on a VObox http://cern.ch/mmeoni/dproof/

  7. Overview ALICE is adapting PROOF to the Grid The framework is under test at 3 sites 3 sites will most likely join within the next week The multi-master PROOF architecture is under test and improvement There is room for changing/improving the policy of JA submission Workgroup meets twice a week since a month Stress test per-site works steadily for hours and keep the PROOF workers busy Test with up to 100 workers on a single site (CERN), processing rate peak 400MB/s Acknowledgement Adam, Anar, Andreas, Andrei, Axel, Bellenot, Costin, Cvetan, Jan Fiete, Latchezar, Federico, Mariella, Matevz, Pablo, Peter

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