Presentation is loading. Please wait.

Presentation is loading. Please wait.

Normal text - click to edit CHEP 2006 - Mumbai ALICE High Level Trigger Interfaces … 1/22 ALICE High Level Trigger Interfaces.

Published byAllison Malone Modified over 8 years ago

Similar presentations

Presentation on theme: "Normal text - click to edit CHEP 2006 - Mumbai ALICE High Level Trigger Interfaces … 1/22 ALICE High Level Trigger Interfaces."— Presentation transcript:

1 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 1/22 ALICE High Level Trigger Interfaces and Data Organisation CHEP 2006 – Mumbai (13.02. – 17.02.2006) Sebastian Robert Bablok, Matthias Richter, Dieter Roehrich, Kjetil Ullaland (Department of Physics and Technology, University of Bergen, Norway) Torsten Alt, Volker Lindenstruth, Timm M. Steinbeck, Heinz Tilsner (Kirchhoff Institute of Physics, Ruprecht-Karls-University Heidelberg, Germany) Harald Appelshaeuser (Institute for Nuclear Physics, University of Frankfurt, Germany) Haavard Helstrup (Faculty of Engineering, Bergen University College, Norway) Bernhard Skaali, Thomas Vik (Department of Physics, University of Oslo, Norway) Cvetan Cheshkov (CERN, Geneva, Switzerland) for the ALICE Collaboration

2 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 2/22 Outline HLT Overview HLT - ECS Interface HLT - DAQ Data Format HLT - GRID Interface Summary & Outlook

3 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 3/22 Outline HLT Overview HLT - ECS Interface HLT - DAQ Data Format HLT - GRID Interface Summary & Outlook

4 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 4/22 HLT Overview Purpose: online event reconstruction and analysis providing of trigger decisions to DAQ monitoring and performance analysis of the ALICE detectors usage of its spare computer power (HLT cluster) for GRID Architecture: ca 500 node cluster (similar to Tier 2) dual SMP board with dual core CPUs (  up to 2000 processing units in sum) Gigabit Ethernet includes up to 300 FEP (Front-End-Processing) nodes receiving data from detectors dynamic software data transport framework (PubSub- and TaskManager system)

5 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 5/22 HLT Overview (300 FEP) (DDL)

6 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 6/22 HLT Overview Interfaces: raw data input copied via D-RORC from DAQ output of processed data and trigger decisions to the DAQ LDCs ECS interface as integration into the ALICE controlling system DCS interface to receive configuration data AliRoot interface to analysis code and for online monitoring AliEn interface to use idle nodes for GRID computing internal node interfaces using the PubSub - and TaskManager system HLT – cluster Detector Event Building / DAQ Trigger GRID DCS Online / Offline Software ECS Monitoring, Logging L2 Accept HLT Accept

7 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 7/22 Outline HLT Overview HLT - ECS Interface HLT - DAQ Data Format HLT - GRID Interface Summary & Outlook

8 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 8/22 Control of HLT through Experiment Control System (ECS) for initialisation and runtime operations Interface: represented as well defined states and transitions managed by Finite State Machines (FSM) ECS controls the HLT via HLT proxy implemented in SMI++ (external communication via DIM) internal communication is using interface library of TaskManager control system HLT - ECS Interface

9 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 9/22 HLT - ECS Interface HLT proxy states and transitions: subdivided into two type of states “stable” states (OFF, INITIALIZED, CONFIGURED, READY, RUNNING, ERROR): transitions only via well defined commands intermediate states (RAMPING_UP_&_INITIALIZING, CONFIGURING, ENGAGING, DISENGAGING, RAMPING_DOWN): longer procedure of transition – implicit transition, when procedure is finished configuration is passed as parameters of configure command mode of the HLT: “A” (no HLT)  no output to DAQ “B” (data processing only)  processed event data to DAQ, HLT trigger decisions ignored by DAQ “C” (full HLT functionality)  HLT trigger and pre-processed event data provided to DAQ output data format: output format version number of data sent back to DAQ trigger classes: tag identifying the desired physics triggers list of DDLs: on which H-RORCs receive event data for the HLT

10 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 10/22 HLT proxy - States ERROR OFF RAMPING_UP_&_INITIALIZING > RAMPING_DOWN > INITIALIZED CONFIGURED READY RUNNING CONFIGURING > ENGAGING > DISENGAGING > initialize implicit transtion shutdown reset shutdown configure reset engage disengage start stop implicit transtion

11 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 11/22 HLT - ECS Interface Implementation: SMI++ (common among all ALICE systems) single instance not partitioned HLT proxy is only active during (de-) initialisation- and configuration phase, in RUNNING state the cluster processes event data autonomously internal communication: interface library of TaskManager (TM) control system HLT proxy contacts to multiple master TMs of the cluster (majority vote – fault tolerance, avoiding single-point-of-failure) master TMs are networked with all slave TMs slave TMs control the PubSub system (RORC publisher and others)

12 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 12/22

13 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 13/22 Outline HLT Overview HLT - ECS Interface HLT - DAQ Data Format HLT - GRID Interface Summary & Outlook

14 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 14/22 HLT - DAQ Data Format HLT – output to DAQ DAQ handles HLT output like data from any other detector (except for the trigger decision). HLT output is received by the DDLs on D-RORCs (DAQ - ReadOut Receiver Cards) located on the LDCs (Local Data Concentrators).

15 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 15/22 HLT - DAQ Data Format Output data format: trigger decision: list of DDLs to read (detector DDLs [e.g. RoI] and HLT DDLs) Event Summary Data (ESD) in case of an accept candidate ID (ID from used trigger class) preprocessed event data [optional]: (partially) reconstructed event compressed raw data preprocessed detector specific data (e.g. Photon Spectrometer pulse shape analysis) Start-Of-Data (SOD) and End-Of-Data (EOD)

16 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 16/22 Outline HLT Overview HLT - ECS Interface HLT - DAQ Data Format HLT - GRID Interface Summary & Outlook

17 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 17/22 HLT - GRID Interface HLT cluster is similar to Tier 2 center:  up to 2000 processing units Cluster usage: HLT processing (ALICE data taking periods) GRID job execution (non data taking periods and unused nodes during data taking)  priority lies on the HLT functionality GRID middleware in ALICE is AliEn (Alice Environment)  HLT cluster offers Computing Element (CE) functionality to AliEn  due to priority in HLT tasks no (permanent) Storage Element (SE)

18 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 18/22 HLT - GRID Interface Dedicated node acts as GRID portal node: has AliEn installed contacts AliEn master takes care of certificates and authentication administration of GRID nodes includes unused nodes into GRID informs AliEn master about estimated Time-To-Live of included nodes (TTL) excludes HLT required nodes from GRID uses Condor as batch system underneath  Condor also installed on each node sharing of GRID applications inside cluster via network

19 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 19/22 HLT - GRID Interface GRID usage Free nodes administration (1): unused nodes (for HLT) are collected in “buffered” pool pool consists of three regions divided by two thresholds: GRID usage: nodes above the soft reserve threshold are offered for GRID jobs. below soft reserve: no more nodes are offered for GRID, unused nodes from the HLT are only collected in reserve, nodes finishing GRID jobs are recollected to reserve (  “soft” stop), nodes needed for HLT are taken from the pool. below hard reserve: amount of reserve nodes is below the safety minimum, GRID nodes are immediately recollected (GRID jobs are canceled) to the reserve (  “hard” stop) until hard reserve threshold is exceeded again. pool soft reserve hard reserve reserve

20 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 20/22 HLT - GRID Interface Free nodes administration (2):  aim of the hard reserve: immediately available spare nodes for HLT  aim of the soft reserve: avoiding “hard” stops as far as possible a sophisticated algorithm will estimate TTL of free nodes (this will develop together with the experience gathered during the use of the HLT cluster)  non data taking periods in this context are just special cases of the normal pool administration

21 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 21/22 Outline HLT Overview HLT - ECS Interface HLT - DAQ Data Format HLT - GRID Interface Summary & Outlook

22 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 22/22 Summary & Outlook HLT: will consist of a large PC cluster (similar to Tier 2) internally managed by TaskManager control system overall system to be configured and controlled by ECS  via well defined states and transitions (commands)  interface implemented in SMI++  internal communication to multiple master TaskManagers via own interface library will provide (pre-) processed data and trigger decisions to DAQ planned to offer unused nodes for GRID computing  organised in “buffered” pool (three regions divided by two thresholds)  interface to AliEn, Condor as batch system  utilisation of significant computing power for multiple applications

23 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 23/22 HLT proxy – States (additional slide)

24 Normal text - click to edit CHEP 2006 - Mumbai Sebastian.Bablok@ift.uib.no ALICE High Level Trigger Interfaces … 24/22 HLT - GRID Interface (additional slide)

Download ppt "Normal text - click to edit CHEP 2006 - Mumbai ALICE High Level Trigger Interfaces … 1/22 ALICE High Level Trigger Interfaces."

Similar presentations

HLT Collaboration; www.ti.uni-hd.de/HLT High Level Trigger HLT PRR Computer Architecture Volker Lindenstruth Kirchhoff Institute for Physics Chair of Computer.

HLT Collaboration; High Level Trigger HLT PRR Computer Architecture Volker Lindenstruth Kirchhoff Institute for Physics Chair of Computer.
CWG10 Control, Configuration and Monitoring Status and plans for Control, Configuration and Monitoring 16 December 2014 ALICE O 2 Asian Workshop

CWG10 Control, Configuration and Monitoring Status and plans for Control, Configuration and Monitoring 16 December 2014 ALICE O 2 Asian Workshop
Setting up of condor scheduler on computing cluster Raman Sehgal NPD-BARC.

Setting up of condor scheduler on computing cluster Raman Sehgal NPD-BARC.
André Augustinus ALICE Detector Control System  ALICE DCS is responsible for safe, stable and efficient operation of the experiment  Central monitoring.

André Augustinus ALICE Detector Control System  ALICE DCS is responsible for safe, stable and efficient operation of the experiment  Central monitoring.
1 Databases in ALICE L.Betev LCG Database Deployment and Persistency Workshop Geneva, October 17, 2005.

1 Databases in ALICE L.Betev LCG Database Deployment and Persistency Workshop Geneva, October 17, 2005.
Peter Chochula, January 31, 2006  Motivation for this meeting: Get together experts from different fields See what do we know See what is missing See.

Peter Chochula, January 31, 2006  Motivation for this meeting: Get together experts from different fields See what do we know See what is missing See.
HLT & Calibration.

HLT & Calibration.
CHEP04 - Interlaken - Sep. 27th - Oct. 1st 2004T. M. Steinbeck for the Alice Collaboration1/20 New Experiences with the ALICE High Level Trigger Data Transport.

CHEP04 - Interlaken - Sep. 27th - Oct. 1st 2004T. M. Steinbeck for the Alice Collaboration1/20 New Experiences with the ALICE High Level Trigger Data Transport.
CHEP04 - Interlaken - Sep. 27th - Oct. 1st 2004T. M. Steinbeck for the Alice Collaboration1/27 A Control Software for the ALICE High Level Trigger Timm.

CHEP04 - Interlaken - Sep. 27th - Oct. 1st 2004T. M. Steinbeck for the Alice Collaboration1/27 A Control Software for the ALICE High Level Trigger Timm.
> IRTG – Heidelberg 2007 < Jochen Thäder – University of Heidelberg 1/18 ALICE HLT in the TPC Commissioning IRTG Seminar Heidelberg – January 2008 Jochen.

> IRTG – Heidelberg 2007 < Jochen Thäder – University of Heidelberg 1/18 ALICE HLT in the TPC Commissioning IRTG Seminar Heidelberg – January 2008 Jochen.
Timm M. Steinbeck - Kirchhoff Institute of Physics - University Heidelberg - DPG 2005 – HK 41.2 1 New Test Results for the ALICE High Level Trigger.

Timm M. Steinbeck - Kirchhoff Institute of Physics - University Heidelberg - DPG 2005 – HK New Test Results for the ALICE High Level Trigger.
HLT Collaboration (23-Jun-15) 1 High Level Trigger HLT PRR Planning Volker Lindenstruth Kirchhoff Institute for Physics Chair of Computer Science University.

HLT Collaboration (23-Jun-15) 1 High Level Trigger HLT PRR Planning Volker Lindenstruth Kirchhoff Institute for Physics Chair of Computer Science University.
1 HLT – ECS, DCS and DAQ interfaces Sebastian Bablok UiB.

1 HLT – ECS, DCS and DAQ interfaces Sebastian Bablok UiB.
The Publisher-Subscriber Interface Timm Morten Steinbeck, KIP, University Heidelberg Timm Morten Steinbeck Technical Computer Science Kirchhoff Institute.

The Publisher-Subscriber Interface Timm Morten Steinbeck, KIP, University Heidelberg Timm Morten Steinbeck Technical Computer Science Kirchhoff Institute.
Timm M. Steinbeck - Kirchhoff Institute of Physics - University Heidelberg 1 Tag Database for HLT Micro-ESDs.

Timm M. Steinbeck - Kirchhoff Institute of Physics - University Heidelberg 1 Tag Database for HLT Micro-ESDs.
CHEP03 - UCSD - March 24th-28th 2003 T. M. Steinbeck, V. Lindenstruth, H. Tilsner, for the Alice Collaboration Timm Morten Steinbeck, Computer Science.

CHEP03 - UCSD - March 24th-28th 2003 T. M. Steinbeck, V. Lindenstruth, H. Tilsner, for the Alice Collaboration Timm Morten Steinbeck, Computer Science.
Normal text - click to edit Status of implementation of Detector Algorithms in the HLT framework Calibration Session – OFFLINE week (16-03-2007) M. Richter,

Normal text - click to edit Status of implementation of Detector Algorithms in the HLT framework Calibration Session – OFFLINE week ( ) M. Richter,
Timm M. Steinbeck - Kirchhoff Institute of Physics - University Heidelberg 1 Timm M. Steinbeck HLT Data Transport Framework.

Timm M. Steinbeck - Kirchhoff Institute of Physics - University Heidelberg 1 Timm M. Steinbeck HLT Data Transport Framework.
Clara Gaspar, May 2010 The LHCb Run Control System An Integrated and Homogeneous Control System.

Clara Gaspar, May 2010 The LHCb Run Control System An Integrated and Homogeneous Control System.
Normal text - click to edit HLT – Interfaces (ECS, DCS, Offline) (Alice week – HLT workshop 06-03-2007) S. Bablok (IFT, University of Bergen)

Normal text - click to edit HLT – Interfaces (ECS, DCS, Offline) (Alice week – HLT workshop ) S. Bablok (IFT, University of Bergen)

Similar presentations

Ads by Google