Sep 2 – 9, 2007
Victoria, Canada
Europe/Zurich timezone
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Large Scale Access Tests and Online Interfaces to ATLAS Conditions Databases

Sep 3, 2007, 8:00 AM
10h 10m
Victoria, Canada

Victoria, Canada

Board: 14
poster Online Computing Poster 1


Antonio Amorim (Universidade de Lisboa (SIM and FCUL, Lisbon))


The ATLAS Trigger and Data Acquisition systems (TDAQ) to the Conditions databases has strong requirements on reliability and performance. Several applications were developed to support the integration of Condition database access with the online services in TDAQ like the interface to the Information Services and to the TDAQ configuration.. The DBStressor was developed to test and stress the access to the Conditions database using the LCG/COOL interface while operating in an integrated way as a TDAQ application. The performance of simultaneous Conditions database read accesses was studied in the context of the ATLAS High Level Trigger large computing farms. A large set of tests were performed involving up to 1000 computing nodes that accessed simultaneously the LCG central database server infrastructure at CERN. Most of the general figures of the results can be explained assuming a simple (model involving) described by a number of threads in the database servers that were providing data at near constant rate. The information storage requirements were the motivation for the ONline ASynchronous Interface form the Information Service (IS) with LCG/COOL databases. It avoids the backpressure from Online Database servers by managing a local cache. In parallel the OKS2COOL application was developed to store Configuration Databases into an Offline Database with history record.
Submitted on behalf of Collaboration (ex, BaBar, ATLAS) ATLAS - TDAQ

Primary authors

Prof. Antonio Amorim (Universidade de Lisboa CFNUL - FCUL) Mrs Doris BURCKHART (CERN) Mr Igor SOLOVIEV (PNPI (Petersburg Nuclear Physics Institute)) Mr Johann Georg VON DER SCHMITT (Max-Planck-Institut fuer Physik) Mr João José de Almeida Simões (UNIVERSIDADE DE LISBOA SIM - FCUL) Mr Lourenço Vaz Gil Lopes (UNIVERSIDADE DE LISBOA SIM - FCUL) Mr Mihai CAPRINI (“Horia Hulubei” National Institute for Physics and Nuclear Engineering (IFIN/HH, Bucharest)) Mr Paulo José Sousa Pereira (UNIVERSIDADE DE LISBOA SIM - FCUL) Mr Serguei KOLOS (University of California, Irvine (UCI, Irvine))

Presentation materials