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1.
Testing on a Large Scale : running the ATLAS Data Acquisition and High Level Trigger Software on 700 PC Nodes / Burckhart-Chromek, Doris (CERN) ; Abolins, M ; Adragna, P ; Albuquerque-Portes, M ; Alexandrov, L ; Amorim, A ; Armstrong, S ; Badescu, E ; Baines, J T M ; Barros, N et al.
The ATLAS Data Acquisition (DAQ) and High Level Trigger (HLT) software system will be comprised initially of 2000 PC nodes which take part in the control, event readout, second level trigger and event filter operations. [...]
ATL-DAQ-CONF-2006-002 ; ATL-COM-DAQ-2006-008 ; CERN-ATL-DAQ-CONF-2006-002.
- 2006. - 6 p.
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2.
Testing on a Large Scale : Running the ATLAS Data Acquisition and High Level Trigger Software on 700 PC Nodes / Burckhart-Chromek, Doris (CERN) ; Abolins, M ; Adragna, P ; Alexandrov, L ; Amorim, A ; Armstrong, S ; Badescu, E ; Baines, J T M ; Barros, N ; Beck, H P et al.
The ATLAS Data Acquisition (DAQ) and High Level Trigger (HLT) software system will be comprised initially of 2000 PC nodes which take part in the control, event readout, second level trigger and event filter operations. [...]
ATL-DAQ-CONF-2006-002 ; ATL-COM-DAQ-2006-008 ; CERN-ATL-DAQ-CONF-2006-002.
- 2006. - 6 p.
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3.
ATLAS DAQ/HLT infrastructure / Ermoline, Yuri
CERN, 2005 Published version from CERN: PDF; External link: Fulltext
In : 11th Workshop on Electronics for LHC and Future Experiments, Heidelberg, Germany, 12 - 16 Sep 2005, pp.327-330 (CERN-2005-011)
4.
Report about the ATLAS TDAQ Data Challenge Support by IT-FIO/FS / Lefébure, V (CERN)
From 6th of June 2005 till 22nd of July 2005, ATLAS has been running its TDAQ Large Scale Tests on part of the IT LXBATCH cluster at CERN. [...]
CERN-IT-Note-2005-001.
- 2005. - 11 p.
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5.
The operational performance of the ATLAS trigger and data acquisition system and its possible evolution / Negri, Andrea (speaker) (Universita e INFN (IT))
The ATLAS experiment at the Large Hadron Collider at CERN relies on a complex and highly distributed Trigger and Data Acquisition (TDAQ) system to gather and select particle collision data at unprecedented energy and rates. The TDAQ is composed of three levels which reduces the event rate from the design bunch-crossing rate of 40 MHz to an average event recording rate of about 200 Hz. The first part of this presentation will give an overview of the operational performance of the DAQ system during 2011 and the first months of data taking in 2012. [...]
2012 - 1447. Conferences; Computing in High Energy and Nuclear Physics (CHEP) 2012 External links: Talk details; Event details In : Computing in High Energy and Nuclear Physics (CHEP) 2012
6.
LHCb: The LHCb off-Site HLT Farm Demonstration
Reference: Poster-2012-238
Keywords:  high level trigger
Created: 2012. -1 p
Creator(s): Liu, Guoming; Neufeld, Niko

The LHCb High Level Trigger (HLT) farm consists of about 1300 nodes, which are housed in the underground server room of the experiment point. Due to the constraints of the power supply and cooling system, it is difficult to install more servers in this room for the future. Off-site computing farm is a solution to enlarge the computing capacity. In this paper, we will demonstrate the LHCb off-site HLT farm which locate in the CERN computing center. Since we use private IP addresses for the HLT farm, we would need virtual private network (VPN) to bridge both sites. There are two kinds of traffic in the event builder: control traffic for the control and monitoring of the farm and the Data Acquisition (DAQ) traffic. We adopt IP tunnel for the control traffic and Network Address Translate (NAT) for the DAQ traffic. The performance of the off-site farm have been tested and compared with the on-site farm. The effect of the network latency has been studied. To employ a large off-site farm, one of the potential bottleneck is IP tunnel and NAT gateway. To eliminate the bottleneck, we will deploy an FPGA card NetFPGA on the gateway to perform the IP tunneling and NATing.

Related links:
Conference: 18th IEEE Real-Time Conference 2012
© CERN Geneva

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7.
The DAQ/HLT system of the ATLAS experiment / Dos Anjos, André (Wisconsin U., Madison)
The DAQ/HLT system of the ATLAS experiment at CERN, Switzerland, is being commissioned for first collisions in 2009. [...]
ATL-DAQ-PROC-2009-006 ; ATL-COM-DAQ-2009-003.
- 2009. - 13 p.
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8.
ATLAS DAQ/HLT rack DCS / Ermolin, Yu ; Burckhart, H ; Francis, D ; Wickens, F J
2007 - Published in : Nucl. Instrum. Methods Phys. Res., A 572 (2007) 59-61
9.
The ATLAS Trigger : Commissioning with cosmic rays / Abolins, M ; Achenbach, R ; Adragna, P ; Aielli, G ; Aleksandrov, E ; Aleksandrov, I ; Aloisio, A ; Alviggi, M G ; Amorim, A ; Anderson, K et al.
The ATLAS detector at CERN's LHC will be exposed to proton-proton collisions from beams crossing at 40 MHz. [...]
ATL-DAQ-CONF-2007-024 ; ATL-COM-DAQ-2007-029.
- 2008. - 12 p.
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10.
Portable Gathering System for Monitoring and Online Calibration at ATLAS / Conde-Muíño, P ; Armstrong, S ; Dos Anjos, A ; Baines, J T M ; Bee, C P ; Biglietti, M ; Bogaerts, J A C (CERN) ; Boisvert, V ; Bosman, M ; Caron, B et al.
During the runtime of any experiment, a central monitoring system that detects problems as soon as they appear has an essential role. [...]
ATL-DAQ-2004-014 ; CERN-ATL-DAQ-2004-014 ; ATL-COM-DAQ-2004-020 ; CERN-ATL-COM-DAQ-2004-020.
- CERN, 2005. - 4 p.
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