Enabling Grids for E-sciencE Experience Supporting the Integration of LHC Experiments Computing Systems with the LCG Middleware Simone Campana LCG Experiment Integration and Support CERN-IT / INFN-CNAF

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 2 Mandate of the LCG/EIS Team  EIS Experiment Integration and Support  EIS : Experiment Integration and Support Team integrating Help LHC Experiments integrating their production environment with the Grid Middleware and utilities. support Offer support during all steps of integration process  understanding of the middleware functionality  testing new prototypal components  getting on the LCG Infrastructure. One person dedicated to each LHC Experiment  Production  Production is the main focus. User Support Experiment Support does not mean User Support. GOC Experiment Support does not mean GOC.

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 3 Main Tasks  Integration Middleware functionality and usage Functionality tests Customized distributions and missing tools Discuss requirements  And bring them to the attention of the developers  Experiment and User Support Documentation: Manuals, Guides, FAQ First line User Support Monitoring experiment specific production system  Provide infrastructure expertise Monitoring/Managing Services  GRID and Experiment Specific Solving site-related problems Service Challenge Second Level Support (on shift)

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 4 Tools… Tools… Tools…  Data Management Customized version of LCG Data Management clients  Workload Management Monitoring of the job “standard error” and “standard output”  g-peek Estimate job normalized CPU and Wall Clock time left on CPU  Information System C++ Generic API (with ldap and R-GMA backends) User friendly querying tools  Generic Framework for Job Submission Intensively used by GEANT4  Many others …  Several functionalitiesintegrated in the Middleware  Several functionalities provided by the tools have been integrated in the Middleware See the g-peek functionality

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 5 Monitoring Tools ATLAS SC3 Service Monitor LHCb specific Site Functional Tests

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 6 Experiment Software Installation Lcg-ManageSoftware Lcg-ManageVOTag Tank&Spark gssklog Lcg-asis UI WN CE

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 7 VO-BOX developed and packaged  First prototype developed and packaged by EIS.  Evaluation of the Globus GSI-enabled ssh server and relative configuration  Development of a ad-hoc proxy renewal server with relative user level tool  Overall configuration of the node type Inclusion of UI clients and gssklog installation issues discussions on possible evolution  Following up installation issues and further discussions on possible evolution

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 8 EIS on ALICE Data Challenges 04 and 05  EIS For Data Challenges 04 and 05 Offered support for the integration of ALICE framework with LCG services  Integration with existing LCG services  Development of new tools Follow up of production exercise  Provided solution for site specific problems  Follow up of services deployment at the sites Collected ALICE requirements for middleware developers

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 9 EIS on ALICE ALICE specific user level tools  Development ALICE specific user level tools Integration of Monalisa monitoring system with LCG  Later, the tools have been generalized for other use-cases FTS transfer handling client  Then integrated in the ALICE framework Publication of VO specific services in the Information System  Included as part of the VO-BOX middleware component

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 10 Some Results of the last PDC04  ◘ Statistics after phase 1 (ended April 4, 2004): ➸ ALICE::CERN::LCG is the interface to LCG-2 ➸ ALICE::Torino::LCG is the interface to GRID.IT 4 ~ 1.3 million files, 26 TB data volume S. Bagnasco. SC3 Detailed Planning Workshop, CERN 13.June, 05 )

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 11 EIS in ATLAS  Support in the development of ATLAS framework Data Management Workload management  Operational support Exclusion of problematic sites Follow up of site configuration problems Understanding of failures and suggestion of solutions Number of jobs per day Data Challenge 2 Rome Production production Large event production for Rome workshop Physics Rome workshop EIS support activities

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 12 Rome Production experience on LCG  Jobs distributed to 45 different computing resources  Ratio generally proportional to the size of the cluster indicates an overall good job distribution.  No site in particular ran large majority of jobs. The site with the largest number of CPU resources (CERN), contributed for about 11% of the ATLAS production. Other major sites ran between 5% and 8% of the jobs each. robust and fault-tolerant system  Achievement toward a more robust and fault-tolerant system does not rely on a small number of large computing centers. The percentage of ATLAS jobs run at each LCG site

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 13 EIS in ATLAS  Service Challenge 3 Support to the ATLAS Data Management System  File Transfer Service (FTS) and LCG File Catalog (LFC)  Prototype Data Location Interface (DLI) developed ATLAS WMS and DDM integration. Role in the technical coordination of the ATLAS Service Challenge activities  ensuring the readiness of the sites before and during the exercise  following up issues with the different services.  Testing Several new glite components (WMS, gpbox, FTS …) In the context of the task force and in collaboration with ARDA  User Support Analysis on LCG produced data

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 14 EIS in CMS  LFCPOOL file catalog  LFC evaluation as a POOL file catalog use case: local file catalog performance tests Results: LFC and POOL_LFC interface issues discovered and fixed  LFCData Location System  LFC evaluation as a Data Location System implementation of a Python API performance tests Results: LFC was found to be an valid implementation of a DLS; performance issues discovered and fixed

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 15 EIS in CMS  Service Challenge 3 fake analysis job submission analysis of job failures and related statistics Results: much better understanding of the stability of the LCG infrastructure when intensively used  Support active in the solution of Grid-related problems for the MC production and user analysis (CRAB) activities VO management  CMS VO management

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 16 The CMS Analysis Jobs Taken from the CMS Dashboard (ARDA)

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 17 EIS in LHCb  EIS supported LHCb along many activities: Data Challenge 04 Data Challenge 04 Service Challenge 3 Service Challenge 3 Analysis exercise Analysis exercise  Operation support chasing/tackling sites and middleware related problems developing experiment specific monitoring tools  T1-T1 transfer monitor for SC3  VO oriented plug-ins for SFT

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 18 EIS in LHCb  Integration of LHCb framework and LCG middleware Offering suggestions for an optimized middleware usage Development of user level tools  Query the information system, interactions with SRM, LFC, DLI. Repackaging or customized version of existing tools  lcg_utils and GFAL  User Support Especially for analysis users Using the GGUS portal  Testing of new components CREAM CE, g-pbox, WMS …

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 19 The LHCb Data Challenge DIRAC alone LCG in action /day LCG paused Phase 1 Completed /day LCG restarted 187 M Produced Events 61% efficiency for LCG Number of Jobs run versus time Jobs run in LCG and Dirac-only sites

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 20  WISDOM: research on malaria medical care Major success in EGEE  1 million of potential medicines tested in 1 week  1000 CPUs employed in EGEE/LCG Support to Biomedical community and the WISDOM project no-HEP  First no-HEP VO supported by EIS Different needs, access pattern, user scenarios Scattered and heterogeneous community  Main support activities for Biomed: Improvement of Job submission strategy Adaptation of application to Grid Environment Oparational support User Support Data Challenge  Biomedical Data Challenge in July - August 2005 ~70000 jobs run 1 TB of data produced equivalent of ~70 CPU years computed.

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 21 GEANT4  GEANT4simulation of particle interactions with matter  GEANT4: simulation of particle interactions with matter. HEP and nuclear experiments, medical, accelerator, space physics 3 major productions on LCG  First 2 hosted by dteam and alice, third as a real VO Aimed to test new version of software “Gridification” process  EIS support in GEANT “Gridification” process Development of tools for job submission an handling  Then extended and generalized for other VOs Creation and administration of the GEANT VO  Contact point for the EGEE ROC managers Operational support during production

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 22 Relief Projects of UNOSAT  Case Study  Case Study: Indian Ocean Tsunami Relief and Development 29 th Dec 2004: First Map distributed online to field users January 2005: 200,000 tsunami maps downloaded in total UNOSAT has a huge amount of data to be stored Good amount of storage provided by CERN Running and storing data in LCG/EGEE can certainly assist UNOSAT in their purposes In Summer 2005 the collaboration with LCG started Gridification prcess similar to GEANT4 experience Gridification prcess similar to GEANT4 experience

Enabling Grids for E-sciencE CHEP06 – February 2006 – Mumbay (India) 23 Summary Our mailing list: Our WEB site: integratingVOsoftware environment GRID middleware  EIS provides help integrating VO specific software environment with GRID middleware Direct experiment support via a contact persons Special middleware distributions documentation User support Data Challenges, Service Challenges and Distributed Productions  Data Challenges, Service Challenges and Distributed Productions Follow up of operational issues  maintaing experiment specific services  assisting sites with configuration problems Not anymore “sporadic” exercises. interesting a productive experience  Overall a very interesting a productive experience LHC experiments and other VOs seem to find EIS team very supportive