Download - Mihnea Dulea, IFIN-HH
20.10.2011 1Mihnea Dulea, IFIN-HH
Efficient Handling and Processing ofPetaByte-Scale Data for the Grid Centers
within the FR Cloud
1ST JOINT SYMPOSIUM CEA-IFA
HaPPSDaG
- PROJECT PRESENTATION -
- FIRST YEAR PROGRESS REPORT -
M. Dulea
National Institute for Nuclear Physics and Engineering 'Horia Hulubei' (IFIN-HH)
20.10.2011 2Mihnea Dulea, IFIN-HH
Computing support for LHC
Project topics
Project objectives and work planning
Framework agreements
General information
Project teams and infrastructure
First year results
OVERVIEW
20.10.2011 3Mihnea Dulea, IFIN-HH
COMPUTING SUPPORT for LHC - LCG
LHC COMPUTING GRID
LCG is a wide distributed array of computing resources that provides the computing support required for the storage, processing, simulation and analysis of the data gathered by the four major experiments performed at LHC.
It consists of more than 140 computing centres and federations of centres from 35 countries.
The resource centres are classified accordingto their size and functionality as Tier-0 (CC@ CERN), Tier-1 (11 centres), and Tier-2.
The centres are interconnected through a high-speed network (GEANT2 in EU).
Current and 2012-2014 activity related to LHC.
20.10.2011 4Mihnea Dulea, IFIN-HH
COMPUTING SUPPORT - FR
ATLAS FRENCH CLOUD
Grid sites:
CC-IN2P3 (Tier-1)
Tier-2 centres: ... (many)
GRIF
Grille de Recherche d'Ile de Francecomputing grid in Paris region, jointinitiative of CEA/IRFU + labs ofCNRS/IN2P3 (6 sites)
The sites are interconnected through dedicated 10 Gbps links; connected to the FR NREN:
RENATER: Réseau national de télécommunications pour la technologie, l'enseignement et la recherche
FR Cloud includes foreign grid centres from China, Japan, Romania
20.10.2011 5Mihnea Dulea, IFIN-HH
COMPUTING SUPPORT - RO
ROMANIAN TIER-2 FEDERATION RO-LCG
Grid sites:
IFIN-HH, 5 Grid sites (resource centres)ISS - Inst. for Space Sciences (2 sites)UPB - Univ. 'Politehnica' of Bucharest ITIM - NIRD in Molecular & Isotopic Technologies - ClujUAIC, Alex. Ioan Cuza University - Iasi
The sites are connected to the 10 Gbpsbackbone of the RO NREN - the Romanian Educational and Research Network RoEduNet
4 grid sites currently support ATLAS vo: RO-07-NIPNE, RO-02-NIPNE (IFIN-HH);
RO-14-ITIM (Cluj), RO-16-UAIC (Iasi)
20.10.2011 6Mihnea Dulea, IFIN-HH
PROJECT TOPIC
Computing support for LHC experiments = provision of grid resources + services
The overall support of LCG
deployment and operation is
provided from other funds (e.g.
CONDEGRID project in RO).
HAPPSDAG addressess specific ATLAS issues
in order to optimize resource usage
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ATLAS ISSUES
Generic requirements regarding
- data transfer from Tier-1 to the associated Tier-2 sites (CC-IN2P3 => RO-LCG)
- transfer of large files from SE to WN for each analysis job; consider many simultaneous jobs
- transfer of log and results files from WN to SE; immediate transfer of log file to UI
RO specific needs at the beginning of the project Grid cluster
- analysis of the causes of the lower performance of
RO-LCG sites before Oct. 2010
- elaborate and test technical solutions for performance
improvement
- ensure better communication and coordination
between the RO sites and the FR-cloud partners
- general measures for improving Tier1 - Tier2 interaction
- elaborate general guidelines regarding the
improvement in efficiency of the grid centers which are
associated to ATLAS clouds Transfer paths from/to the Storage Element (SE)
15.11.2010 8Mihnea Dulea, IFIN-HH
Improve communication and coordination between GRIF/IN2P3 and RO sites (RO/FR)
Testing & improving quality of the FR - RO data link for large dataset transfers (RO/FR)
Implementation of specific measures for increasing ATLAS job load and storage
performance on sites (RO) Improving large dataset transfer between FR - RO and data analysis (RO/FR)
Contributing to grid monitoring and technical support within FR-cloud (RO)
Training regarding grid monitoring and support (FR => RO)
Dissemination (RO/FR)
Strategic objective: provide means for improvement of the processing and handling of large data sets at the Tier2 centers which participate in the ATLAS experiment at the LHC computing support. (RO - case study)
Specific objectives and partner contributions:
PROJECT OBJECTIVES
20.10.2011 9Mihnea Dulea, IFIN-HH
PLANNING of WORK
Stage 1 (01.10.2010 - 10.12.2010)
Analysis of Tier1-Tier2 communication
Stage 2 (01.01.2011 - 30.09.2011)
Studies and software tools for monitoring and operation of the FR Cloud - RO grid connection and job loading. Testing of data handling and processing.
Stage 3 (01.10.2011 - 30.09.2012)
Methods and procedures for improving the performance of the RO sites within the FR Cloud
20.10.2011 10Mihnea Dulea, IFIN-HH
General Cooperation Agreement for Scientific Research
between CEA and IFA, signed in December 2009
- Field of cooperation: Technologies for Information and Health
- Topic proposed for 2010: Grid Technologies
Joint Call for proposals of joint R&D projects (May 2010)
- IFIN-HH and IRFU submitted a proposal for a Joint Research and
Development Projects
Cooperation Agreement in the Field of Scientific Research (AS)
between CEA and IFIN-HH, (01.10.2010)
- General Coordinators: Gerard Cognet (FR), Ioan Ursu (RO)
- leading and coordinating the cooperation activities
Project Agreement (CEA, IFIN-HH)
FRAMEWORK AGREEMENTS
20.10.2011 11Mihnea Dulea, IFIN-HH
RO Contract n° C1-06/2010, between IFA and IFIN-HH Start date: 01/10/2010 Duration: 24 months Funding of the RO part of the project: 400 000 lei (~ 94.000 €) Funding of the FR part of the project: 133 000 €
GENERAL INFORMATION
BUDGET 2010 2011 2012RO (lei) CEA (Eur) RO (lei) CEA (Eur) RO (lei) CEA (Eur)
Manpower 25.333 6000 120.133 48000 82.000 22000Travels 8.000 4000 3.200 14000 8.000 14000Others (Romanian Engineer staying at Saclay )
5000 10000 10000
Others (French guests staying in Romania )
0 10.000 10.000
Others (equipment) 0 40.000 40.000Others (indirect costs) 6.667 26.667 20.000
Total: 40.000 15.000 200.000 72.000 160.000 46.000
20.10.2011 12Mihnea Dulea, IFIN-HH
PROJECT TEAMS
Project coordinators: Jean-Pierre Meyer (FR), Mihnea Dulea (RO)
Technical correspondents: Pierrick Micout (FR), Gabriel Stoicea (RO)
FR team (CEA/IRFU)Eric LANÇONPierrick MICOUTChristine LEROYFrédéric SCHAERZoulikha GEORGETTEAdelino GOMEZ
RO team (IFIN-HH)
Serban Constantinescu
Mihai Ciubancan
Ionut Traian Vasile
Camelia Mihaela Visan
INFRASTRUCTURE @ CTI/DPETI1200 (grid) + 960 (hpc) cores, 270 TB
Centre for Informational Technologies (CTI) - IFIN-HH
20.10.2011 14Mihnea Dulea, IFIN-HH
ANALYSIS of NETWORK INFRASTRUCTURE
Objective: identify the weak points of the FR-RO data connection and adoption of measures for improving the transfer capacity of large datasets.
Network structure: complex, various owners and administrators => more difficult to act
Activities (RO+FR) Testing connectivity & transport capacity with various tools Finding routing paths and points of data traffic delay Comparing performances of RO-CERN link with those of RO-IN2P3
Section Centres Administrator Owner LocationIFIN-HH LAN RO-02-NIPNE
RO-07-NIPNECTI/DPETI IFIN-HH Magurele
IFIN - UPB UPB ICOMM IFIN-HH UPBRoEduNet RO-14-ITIM
RO-16-UAICAARNIEC MECTS Romania
GEANT2 In 34 EU states
DANTE EU NRENs EU
RENATER GRIF, IN2P3 GIP RENATER GIP RENATER
France
Conclusions: a) performance degradation at RoEduNet / GEANT2 interface
b) bottlenecks on some of the RoEduNet routers
20.10.2011 15Mihnea Dulea, IFIN-HH
IMPROVING POINT-TO-POINT TRAFFIC PERFORMANCES
Requires close collaboration with network administrators along the RO-FR path
Example: following bandwidth capacity and traffic analysis, a RoEduNet router was found, responsible of bottlneck. AARNIEC's intervention rised the available bandwidth to 700 Mbps (fig. below).
Permanent monitoring required
20.10.2011 16Mihnea Dulea, IFIN-HH
MONITORING TOOLS forDATA TRANSFER and STORAGE PERFORMANCE - 1
Development of software tools for monitoring of SE traffic (in/out) (adding data sent by daemons running on storage servers in a database + web interface for display)
Tools developed in IFIN-HH; useful for FR partners too for monitoring RO sites.
Traffic from/to WNs and from/to external network
Max at 5 Gbps Max at > 3 Gbps
20.10.2011 17Mihnea Dulea, IFIN-HH
MONITORING TOOLS forDATA TRANSFER and STORAGE PERFORMANCE - 2
Traffic on gateway (in/out); SE extern throughput
Monitoring groups of running or pending jobs
20.10.2011 18Mihnea Dulea, IFIN-HH
MONITORING TOOLS forDATA TRANSFER and STORAGE PERFORMANCE - 3
Accounting of running or pending jobs on CE or CREAM-CE
20.10.2011 19Mihnea Dulea, IFIN-HH
IMPROVEMENT of SITE MONITORING and TECHNICAL SUPPORT
Implementation of its own SAM (Service Availability Monitoring) system, that uses IFIN-HH grid infrastructure and a new monitoring vo - ifops. Results published using Nagios.
Early notification of technical staff leads to improvement of availability of grid services
Monitoring of CREAM-CE, tbit03.nipne.ro
20.10.2011 20Mihnea Dulea, IFIN-HH
IMPROVEMENT and TESTS of SE-WN THROUGHPUT
Adding more resources (WNs) doesn't always mean better results. Scalability is required
Improvement of file transfer speed from SE to WN, required by analysis jobs (4-6 files 2-4 GB)
Replacing the transfer to disk servers through Network File System (NFS) protocole by new DPM (Disk Pool Manager) disk storage servers.
Higher transfer speed => no job exceeds the time limit => no cancellation
Tests of the new configuration
Time representation of the transfer speed (in Mbps) for 70 quasi-simultaneous jobs
20.10.2011 21Mihnea Dulea, IFIN-HH
GLOBAL IMPROVEMENT of EFFICIENCY
Mean efficiency of ATLAS job execution in 2011: 91%
Monthly number of ATLAS jobs and number of ATLAS events processed in RO-LCG
20.10.2011 22Mihnea Dulea, IFIN-HH
TRAINING REGARDING MONITORING AND TECHNICAL SUPPORT
20.06.11 - 04.07.11: training stage of C. Visan at CEA/IRFU, preparing later participation to monitoring and support activities for FR Cloud sites.
Topics:
- CEA/IRFU monitoring methods at site, VO, project levels; EGI/WLCG and LHC
monitoring (Christine Leroy, Pierrick Micout )
- grid site usage (Georgette Zoulikha)
- NAGIOS installing/configuration on virtual machines (Frederic Schaer)
- job submission through Pathena (PanDA Athena), at LAL-Orsay (Laurent Duflot)
- CACTI site monitoring (Victor Mendoza, Université Pierre et Marie Curie (UPMC))
- instructions for site and job monitoring in ADCoS (ATLAS Distributed Computing
Operations Shift) and for support team of FR Cloud (Squad). (Sabine Crepe)
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MOBILITY
Kick-off meeting (15-16.11 2010, Saclay)
Participation at the RO-LCG 2010 Conference, Bucharest (Christine Leroy, Sabine
Crepe - IN2P3)
Participation of Gabriel Stoicea to the spring meeting of LCG-France (30-31.05.2011)
Training - monitoring and support (20.06.11 - 04.07.11, Saclay), C.M. Visan
20.10.2011 24Mihnea Dulea, IFIN-HH
BENEFITS
CEA/IRFU
The results of the project contribute to global improvement of FR Cloud efficiency
Elaboration, in collaboration, of general guidelines for interaction between grid centres
in ATLAS clouds, and
Using FR-RO interaction as a representative case study for sharing best practices with
smaller sites
IFIN-HH
General efficiency improvement of the activity of the RO sites
Better integration and visibility in the framework of the computing support for ATLAS
collaboration
High-level training of RO technical staff
20.10.2011 25Mihnea Dulea, IFIN-HH
PROSPECTS
Further development of methods and procedures for improving the performance of the RO sites within the FR Cloud
General guidelines regarding the improvement in efficiency of the grid centers which are associated to ATLAS clouds
HAPPSDAG workshop and technical meeting in Bucharest (28-30.11.2011)
Participation of IFIN-HH to site and job monitoring in ADC shifts (ATLAS Distributed Computing) or in the monitoring team of FR Cloud.
Dissemination of results
20.10.2011 26Mihnea Dulea, IFIN-HH
THANK YOU FOR YOUR ATTENTION !
Questions?