ICALEPCS2013 - List of Authors (Cardoso, L.G.)

Paper

Title

Page

Control and Monitoring of the Online Computer Farm for Offline Processing in LHCb

721

L.G. Cardoso, P. Charpentier, J. Closier, M. Frank, C. Gaspar, B. Jost, G. Liu, N. Neufeld
CERN, Geneva, Switzerland
O. Callot
LAL, Orsay, France

LHCb, one of the 4 experiments at the LHC accelerator at CERN, uses approximately 1500 PCs (averaging 12 cores each) for processing the High Level Trigger (HLT) during physics data taking. During periods when data acquisition is not required most of these PCs are idle. In these periods it is possible to profit from the unused processing capacity to run offline jobs, such as Monte Carlo simulation. The LHCb offline computing environment is based on LHCbDIRAC (Distributed Infrastructure with Remote Agent Control). In LHCbDIRAC, job agents are started on Worker Nodes, pull waiting tasks from the central WMS (Workload Management System) and process them on the available resources. A Control System was developed which is able to launch, control and monitor the job agents for the offline data processing on the HLT Farm. This control system is based on the existing Online System Control infrastructure, the PVSS SCADA and the FSM toolkit. It has been extensively used launching and monitoring 22.000+ agents simultaneously and more than 850.000 jobs have already been processed in the HLT Farm. This paper describes the deployment and experience with the Control System in the LHCb experiment.

Poster TUPPC063 [2.430 MB]

Paper	Title	Page
TUPPC063	Control and Monitoring of the Online Computer Farm for Offline Processing in LHCb	721
	L.G. Cardoso, P. Charpentier, J. Closier, M. Frank, C. Gaspar, B. Jost, G. Liu, N. Neufeld CERN, Geneva, Switzerland O. Callot LAL, Orsay, France
	LHCb, one of the 4 experiments at the LHC accelerator at CERN, uses approximately 1500 PCs (averaging 12 cores each) for processing the High Level Trigger (HLT) during physics data taking. During periods when data acquisition is not required most of these PCs are idle. In these periods it is possible to profit from the unused processing capacity to run offline jobs, such as Monte Carlo simulation. The LHCb offline computing environment is based on LHCbDIRAC (Distributed Infrastructure with Remote Agent Control). In LHCbDIRAC, job agents are started on Worker Nodes, pull waiting tasks from the central WMS (Workload Management System) and process them on the available resources. A Control System was developed which is able to launch, control and monitor the job agents for the offline data processing on the HLT Farm. This control system is based on the existing Online System Control infrastructure, the PVSS SCADA and the FSM toolkit. It has been extensively used launching and monitoring 22.000+ agents simultaneously and more than 850.000 jobs have already been processed in the HLT Farm. This paper describes the deployment and experience with the Control System in the LHCb experiment.
	Poster TUPPC063 [2.430 MB]