Speaker
Mr
Krzysztof Wrona
(Deutsches Elektronen-Synchrotron (DESY),Germany)
Description
The HERA luminosity upgrade and enhancements of the detector have led to considerably
increased demands on computing resources for the ZEUS experiment. In order to meet
these higher requirements, the ZEUS computing model has been extended to support
computations in the Grid environment.
We show how to use the Grid services in the production system of a real experiment
and point out the main issues, which must be addressed in order to use the Grid
resources routinely and efficiently. We present the ZEUS Grid-toolkit designed as an
additional layer between the Grid and experiment specific software. It provides a
general interface for job management and data handling, which makes our application
software independent of the actual Grid middleware software version. Different Grid
middleware implementations as LCG or Grid2003 may be used simultaneously and smooth
migration is possible as new middleware implementations appear (gLite). The job
efficiency is significantly improved by introducing fault tolerant methods. The
toolkit uses extensible Perl classes for job management and implements additional
features like dynamic creation of job description, automatic job resubmission and
validation of the job results.
The toolkit has been successfully used in the integrated ZEUS Monte Carlo production
system for more than a year.
Primary authors
Dr
Hartmut Stadie
(Deutsches Elektronen-Synchrotron (DESY),Germany)
Mr
Krzysztof Wrona
(Deutsches Elektronen-Synchrotron (DESY),Germany)
Co-authors
Dr
James Ferrando
(University of Glasgow, United Kingdom)
Dr
Michael Ernst
(Deutsches Elektronen-Synchrotron (DESY),Germany)
Dr
Rainer Mankel
(Deutsches Elektronen-Synchrotron (DESY),Germany)
