CERN Accelerating science

Internal Note and Article
Report number	hep-ex/0305093 ; CHEP-2003-TUGT009 ; ATL-DAQ-2003-010 ; ATL-DAQ-2003-010
Title	Supervision of the ATLAS High Level Trigger System
Related title	A TOROIDAL LHC APPARATUS LARGE HADRON COLLIDER
Author(s)	Wheeler, S. (Alberta U.) ; Flammer, J. (CERN) ; Meessen, C. (Marseille, CPPM) ; Qian, Z. (Marseille, CPPM) ; Touchard, F. (Marseille, CPPM) ; Negri, France A. (Pavia U. ; INFN, Pavia) ; Zobernig, H. (Wisconsin U., Madison)
Publication	2003
Imprint	28 May 2003
Number of pages	6
Note	Comments: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 6 pages, PDF (from MS Word). PSN TUGT009 Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 6 pages, PDF (from MS Word). PSN TUGT009
In:	eConf C0303241 (2003) pp.TUGT009
In:	2003 Conference for Computing in High-Energy and Nuclear Physics, La Jolla, CA, USA, 24 - 28 Mar 2003, pp.TUGT009
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	ATLAS ; Supervision ; Trigger
Abstract	The ATLAS High Level Trigger (HLT) system provides software-based event selection after the initial LVL1 hardware trigger. It is composed of two stages, the LVL2 trigger and the Event Filter. The HLT is implemented as software tasks running on large processor farms. An essential part of the HLT is the supervision system, which is responsible for configuring, coordinating, controlling and monitoring the many hundreds of processes running in the HLT. A prototype implementation of the supervision system, using tools from the ATLAS Online Software system is presented. Results from scalability tests are also presented where the supervision system was shown to be capable of controlling over 1000 HLT processes running on 230 nodes.
Copyright/License	Preprint: (License: CC-BY-4.0)

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