infso-ri-508833 enabling grids for e-science experience of using glite for analysis of atlas...
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INFSO-RI-508833
Enabling Grids for E-sciencE
www.eu-egee.org
Experience of using gLite for
analysis of ATLAS combinedtest beam data A. Zalite / PNPI
Enabling Grids for E-sciencE
INFSO-RI-508833
Overview
• EGEE project (Enabling Grid for E-sciencE)
• ARDA (A Realisation of Distributed Analysis for LHC)
• Experience with gLite prototype
Enabling Grids for E-sciencE
INFSO-RI-508833
The EGEE project
• Create a European-wide Grid production quality infrastructure for multiple sciences
• Profit from current and planned national and regional Grid programmes, building on– the results of existing projects such as DataGrid
(EDG), LCG and others
– EU Research Network and industrial Grid developers
• Support Grid computing needs common to the different communities– integrate the computing infrastructures and agree on
common access policies
• Exploit International connections (US)
• 70 leading institutions in 27 countries(including Russia and US)
Enabling Grids for E-sciencE
INFSO-RI-508833
ARDA
• ARDA is an LCG project– main activity is to enable LHC analysis on the grid
• ARDA is contributing to EGEE NA4 – uses the entire CERN NA4-HEP resource
• Work is based on last years experience/components – Grid projects (LCG, VDT, EDG …) – Experiments tools (Alien, Dirac, GAE, Octopus, Ganga, Dial,…)
• Interface with the new EGEE middleware (gLite)– Key player in the evolution from LCG2 to the EGEE
infrastructure– Verify the components in an analysis environments
Enabling Grids for E-sciencE
INFSO-RI-508833
ARDA & HEP experiments
EGEE middleware (gLite)
LHCbGanga,Dirac,
Gaudi, DaVinci…
AliceROOT,AliRoot,
Proof…
CMSCobra,Orca,OCTOPUS…
AtlasDial,Ganga,
Athena, Don Quijote
ARDA
LCG2
ARDA is an LCG project whose main task is to enable LHC analysis on the GRID
Enabling Grids for E-sciencE
INFSO-RI-508833
Prototype overview
LHC
Experiment
Main focus Basic prototype component
Experiment analysis
application framework
Middleware
GUI to Grid GANGA DaVinci
Interactive analysis
PROOF
ROOT
AliROOT
High level service
DIAL Athena
Exploit native gLite
functionalityAligned with
APROM ORCA
Enabling Grids for E-sciencE
INFSO-RI-508833
Future EGEE Middleware - gLite
• Intended to replace LCG-2
• Starts with existing components
• Aims to address LCG-2 shortcoming and advanced needs from applications (in particular feedback from DCs)
• Prototyping short development cycles for fast user feedback
• Initial web-services based prototypes being tested
Globus 2 based Web services based
gLite-2gLite-1LCG-2LCG-1
Enabling Grids for E-sciencE
INFSO-RI-508833
Basic Principles
• Lightweight (existing) services – Easily and quickly deployable– Use existing services where possible as
basis for re-engineering – be pragmatic
• Interoperability– Allow for multiple implementations
• Portable– Being built on Scientific Linux and Windows
• Co-existence with deployed infrastructure– Reduce requirements on participating sites– Flexible service deployment
Multiple services running on the same physical machine (if possible)– Co-existence with LCG-2 and OSG (US) are essential for the EGEE Grid
service
Enabling Grids for E-sciencE
INFSO-RI-508833
Middleware Prototype
Source: http://egee-jra1.web.cern.ch/egee-jra1/Prototype/testbed.htm
CE (lxn5210)VOMS/myProxy
(lxn5210)
WN (lxn5211)
SE dCache(lxn5208)
SE Castor(lxn5209)
Core services (lxn5219)
Database, proxy, ldap (lxn5220)
GAS (lxn5216)
Enabling Grids for E-sciencE
INFSO-RI-508833
ATLAS Combined Test Beam
Example:
ATLAS TRT data analysis done together with ARDA team
Number of straw hits per layer
Real data processed at gLiteStandard Athena for testbeam
Data from CASTOR
Processed on gLite worker node