Grid Interoperation with ARC middleware for the CMS experiment

Abstract

The Compact Muon Solenoid (CMS) is one of the general purpose experiments at the CERN Large Hadron Collider (LHC). CMS computing relies on different grid infrastructures to provide computational and storage resources. The major grid middleware stacks used for CMS computing are gLite, Open Science Grid (OSG) and ARC (Advanced Resource Connector). Helsinki Institute of Physics (HIP) hosts one of the Tier-2 centers for CMS computing. CMS Tier-2 centers operate software systems for data transfers (PhEDEx), Monte Carlo production (ProdAgent) and data analysis (CRAB). In order to provide the Tier-2 services for CMS, HIP uses tools and components from both ARC and gLite grid middleware stacks. Interoperation between grid systems is a challenging problem and HIP uses two different solutions to provide the needed services. The first solution is based on gLite-ARC grid level interoperability. This allows to use ARC resources in CMS without modifying the CMS application software. The second solution is based on developing specific ARC plugins in CMS software.

UNICORE EMI-Execution Service realization towards improved open standards

“…Hence, several of these concepts can be improved to facilitate an efficient execution and management of Grid applications on distributed computing infrastructures today. But in order to suggest several improvements for open standards, EMI [5] followed an approach to cover a set of concepts to be supported by ARC [11], gLite [9], and UNICORE [1], thus resulting in the EMI-ES specification. It consists of job management and monitoring interfaces, state model, activity description schema, and resource and activity representations.…”