9-13 July 2018
Sofia, Bulgaria
Europe/Sofia timezone

Optimizing access to conditions data in ATLAS event data processing

10 Jul 2018, 16:00
1h
Sofia, Bulgaria

Sofia, Bulgaria

National Culture Palace, Boulevard "Bulgaria", 1463 NDK, Sofia, Bulgaria
Poster Track 4 - Data Handling Posters

Speaker

Lorenzo Rinaldi (Universita e INFN, Bologna (IT))

Description

The processing of ATLAS event data requires access to conditions data which is stored in database systems. This data includes, for example alignment, calibration, and configuration information which may be characterized by large volumes, diverse content, and/or information which evolves over time as refinements are made in those conditions. Additional layers of complexity are added by the need to provide this information across the worldwide ATLAS computing grid and the sheer number of simultaneously executing processes on the grid, each demanding a unique set of conditions to proceed. Distributing this data to all the processes that require it in an efficient manner has proven to be an increasing challenge with the growing needs and numbers of event-wise tasks.
In this presentation, we briefly describe the systems in which we have collected information about the use of conditions in event data processing. We then proceed to explain how this information has been used only to refine reconstruction software and job configuration but also to guide modifications of underlying conditions data configuration and in some cases, rewrites of the data in the database into a more harmonious form for offline usage in the processing of both real and simulated data.

Primary authors

Lorenzo Rinaldi (Universita e INFN, Bologna (IT)) Elizabeth Gallas (University of Oxford (GB)) Andrea Formica (Université Paris-Saclay (FR))

Presentation Materials