1176556 SzGeCERN 20220817153542.0 oai:cds.cern.ch:1176556 cerncds:CERN 10.1088/1742-6596/119/7/072012 DOI SPIRES 8071080 Inspire 803969 eng Cranshaw, J Argonne AUTHOR|(CDS)2071444 #BEARD# Building a scalable event-level metadata service for ATLAS 2008 The ATLAS TAG Database is a multi-terabyte event-level metadata selection system, intended to allow discovery, selection of and navigation to events of interest to an analysis. The TAG Database encompasses file- and relational-database-resident event-level metadata, distributed across all ATLAS Tiers. An oracle hosted global TAG relational database, containing all ATLAS events, implemented in Oracle, will exist at Tier O. Implementing a system that is both performant and manageable at this scale is a challenge. A 1 TB relational TAG Database has been deployed at Tier 0 using simulated tag data. The database contains one billion events, each described by two hundred event metadata attributes, and is currently undergoing extensive testing in terms of queries, population and manageability. These 1 TB tests aim to demonstrate and optimise the performance and scalability of an Oracle TAG Database on a global scale. Partitioning and indexing strategies are crucial to well-performing queries and manageability of the database and have implications for database population and distribution, so these are investigated. Physics query patterns are anticipated, but a crucial feature of the system must be to support a broad range of queries across all attributes. Concurrently, event tags from ATLAS Computing System Commissioning distributed simulations are accumulated in an Oracle-hosted database at CERN, providing an event-level selection service valuable for user experience and gathering information about physics query patterns. In this paper we describe the status of the Global TAG relational database scalability work and highlight areas of future direction. CC-BY publication SzGeCERN Computing and Computers ARTICLE CERN CERN LHC ATLAS Goosens, L CERN Malon, D Argonne McGlone, H Glasgow U. Tique Aires Viegas, F CERN PH-EP 072012 J. Phys.: Conf. Ser. 119 2008 h 200919 a2008 13 20100901 1608 CER01 20090511 947732 072012 victoria20070902 PUBLIC 002820077CER ARTICLE ConferencePaper 1124107 SzGeCERN 20240223164112.0 oai:cds.cern.ch:1124107 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-048 eng CERN Library AB-2008-048 Angoletta, M E CERN CERN PSB Beam Tests of CNAO Synchrotron's Digital LLRF 2008 Geneva CERN 04 Sep 2008 4 p The Italian National Centre for Oncological hAdrontherapy (CNAO), in its final construction phase, uses proton and carbon ion beams to treat patients affected by solid tumours. At the heart of CNAO is a 78- meter circumference synchrotron that accelerates particles to up to 400 MeV/u. The synchrotron relies on a digital LLRF system based upon Digital Signal Processors (DSPs) and Field Programmable Gate Array (FPGA). This system implements cavity servoing and beam control capabilities, such as phase and radial loops. Beam tests of the CNAO synchrotron LLRF system were carried out at CERN's Proton Synchrotron Booster (PSB) in autumn 2007, to verify the combined DSP/FPGA architecture and the beam control capabilities. For this, a prototype version of CNAO's LLRF system was adapted to the PSB requirements. This paper outlines the prototype system layout and describes the tests carried out and their results. In particular, system architecture and beam control capabilities were successfully proven by comparison with the PSB operational beam control system and with the help of several existing beam diagnostic systems. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN PS Booster Bourrion, O LPSC, Grenoble De Martinis, C Milan U. INFN, Milan Falbo, L CNAO, Pavia Findlay, A CERN Foglio, R LPSC, Grenoble Hunt, S CNAO, Pavia Tourres, D LPSC, Grenoble Vescovi, C LPSC, Grenoble AB RF https://accelconf.web.cern.ch/e08/papers/tupc154.pdf Published version from JACoW http://cds.cern.ch/record/1124107/files/CERN-AB-2008-048.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100608 1158 CER01 20080904 1048205 TUPC154 genoa20080623 PUBLIC 000700594CER ARTICLE ConferencePaper 1176335 SzGeCERN 20160422221021.0 arXiv oai:arXiv.org:0905.1113 arXiv:0905.1113 eng Nicolae, Bogdan INRIA - IRISA BlobSeer: How to Enable Efficient Versioning for Large Object Storage under Heavy Access Concurrency 2009 08 May 2009 To accommodate the needs of large-scale distributed P2P systems, scalable data management strategies are required, allowing applications to efficiently cope with continuously growing, highly dis tributed data. This paper addresses the problem of efficiently stor ing and accessing very large binary data objects (blobs). It proposesan efficient versioning scheme allowing a large number of clients to concurrently read, write and append data to huge blobs that are fragmented and distributed at a very large scale. Scalability under heavy concurrency is achieved thanks to an original metadata scheme, based on a distributed segment tree built on top of a Distributed Hash Table (DHT). Our approach has been implemented and experimented within our BlobSeer prototype on the Grid'5000 testbed, using up to 175 nodes. LANL EDS arXiv cs.DC PREPRINT LANL EDS cs.DC Antoniu, Gabriel INRIA - IRISA, INRIA Rhône-Alpes / LIP Laboratoire de l'Informatique du Parallélisme Bougé, Luc INRIA - IRISA, INRIA Rhône-Alpes / LIP Laboratoire de l'Informatique du Parallélisme DAMAP 2009 (2009) n 200918 11 20090508 2101 CER01 20090508 PUBLIC 002820060CER PREPRINT Hidden http://arxiv.org/pdf/0905.1113.pdf Preprint 1171561 SzGeCERN 20160422220019.0 arXiv oai:arXiv.org:0904.1299 SPIRES 8234841 Inspire 817541 arXiv:0904.1299 eng SI20090302A Riede, Moritz On the Communication of Scientific Results: The Full-Metadata Format 2009 09 Apr 2009 In this paper, we introduce a scientific format for text-based data files, which facilitates storing and communicating tabular data sets. The so-called Full-Metadata Format builds on the widely used INI-standard and is based on four principles: readable self-documentation, flexible structure, fail-safe compatibility, and searchability. As a consequence, all metadata required to interpret the tabular data are stored in the same file, allowing for the automated generation of publication-ready tables and graphs and the semantic searchability of data file collections. The Full-Metadata Format is introduced on the basis of three comprehensive examples. The complete format and syntax is given in the appendix. LANL EDS arXiv cs.DL arXiv cs.IR arXiv physics.comp-ph arXiv physics.ins-det PREPRINT LANL EDS cs.DL LANL EDS cs.IR LANL EDS physics.comp-ph LANL EDS physics.ins-det Schueppel, Rico Sylvester-Hvid, Kristian O Kuehne, Martin Roettger, Michael C Zimmermann, Klaus Liehr, Andreas W n 200914 11 20100408 1742 CER01 20090409 PUBLIC 002816073CER PREPRINT Hidden http://arxiv.org/pdf/0904.1299.pdf Preprint