Speaker
Oliver Gutsche
(FERMILAB)
Description
The CMS computing model provides reconstruction and access to recorded data of the
CMS detector as well as to Monte Carlo (MC) generated data. Due to the increased
complexity, these functionalities will be provided by a tier structure of globally
located computing centers using GRID technologies. In the CMS baseline, user access
to data is provided by the CMS Remote Analysis Builder (CRAB) analysis tool which
enables the user to execute analysis applications on locally resident data using GRID
tools independent of the geographical location. Currently, mostly two different
toolkits provide the needed functionalities, the Worldwide LHC Computing Grid (LCG)
and the OpenScience Grid (OSG). Due to infrastructure and service differences between
the two toolkits, analysis tools developed for one are frequently not immediately
compatible with the other. In this paper, we will describe the development of
additions to the CRAB tool to run user analysis on OSG sites. We will discuss the
approach of using the GRID submission of the CONDOR batch system (CONDOR-G) to
provide a sandbox functionality for the user's analysis job. For LCG sites, this is
provided amongst other things by the resource broker. We will discuss the differences
of user analysis on LCG and OSG sites and present first experiences running CMS user
jobs at OSG sites.
Primary authors
Bockjoo Kim
(University of Florida)
Oliver Gutsche
(FERMILAB)
