Speaker
Dr
Zhen Xie
(Princeton University)
Description
Non-event data describing detector conditions change with time and
come from different data sources. They are accessible by physicists
within the offline event-processing applications for precise calibration of reconstructed data as well as for data-quality control purposes.
Over the past three years CMS has developed and deployed a software
system managing such data. Object-relational mapping and the relational
abstraction layer of the LHC persistency framework are the foundation;
the offline condition framework updates and delivers C++ data objects according to their validity. A high-level tag versioning system allows production managers to organize data in hierarchical view. A scripting API in python, command-line tools and a web service serve physicists in daily work. A mini-framework is available for handling data coming from external sources. Efficient data distribution over the worldwide network is guaranteed by a system of hierarchical web caches.
The system has been tested and used in all major productions, test-beams and cosmic runs.
Primary authors
Dr
Giacomo Govi
(Northeastern University)
Dr
Vincenzo Innocente
(CERN)
Dr
Zhen Xie
(Princeton University)
