21 october 2010 dietrich liko grid tier-2 hephy scientific advisory board

21 October 2010

Dietrich Liko

Grid Tier-2HEPHY Scientific Advisory Board

Computing

Computing Group

• Leader: G. Walzel• Group: S. Fichtinger, U. Kwapil, D. Liko,

N. Hörmann, B. Wimmer

• Grid Effort: 2.5 FTE General Computing: 3 FTE

2Dietrich Liko21 October 2011

Computing

Overview

• Status– CMS Operations

– Other Activities

• Current issues– Operational Costs

– EGI Membership

• New Developments– Austrian Center for Scientific Computing (ACSC)

– Hosting at HPC Site of TU Vienna

• Summary


Computing

Status of CMS Tier-2 Operation

• With the start of LHC physics operation, the grid has been challenged with the real use case – it was a success !

– The data could be transported out of CERN

– The users could perform their analysis on the Tier-2 clusters


Week

Up to 500 concurrent users On average 134000 jobs/day

134000 jobs/day134000 jobs/day

Computing

Tier-2 in Vienna


• Vienna is 2% of overall CMS Tier-2 capacity

• 450 CPU cores with Linux SLC5– Average Tier-2 site

• About 3000 jobs/day• Availability always close to

98 %– Among the best sites

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Datatransfers

• About 1 TB/day incoming and outgoing

• 300 TB Storage capacity


1 TB/day

Spikes due to fast link to CERNPowercut

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Vienna CMS Center

• Commissioned and approved for computing shifts from Vienna

• First shifts have been done from Vienna


Open Day at LHC Startup Computing Shift

Computing

Why is the Tier-2 important for CMS Vienna Group

• Contributes to the overall CMS Computing– 2% of the CMS Tier-2 Capacity

• Part of the CMS SUSY Cluster– RWTH Aachen, Bari, London Imperial College, U Florida– We can influence how the common disk-space is used– We are a partner on the same level as our colleagues

• Our own specific analysis– Example: Development of OSET analysis required 40 TB of disk-space– A very visible contribution to CMS; without Tier-2 not possible

• Gives us resources we can control– In case of important findings and conferences– Competition between the institutes is severe

• All Vienna contributions to the physics publications profited from the Tier-2 resources


Computing

Other activities: Theory group

• Collaboration with HEPHY Theory Group

• Scan of CP Violation parameters of a BSM Model – Two Higgs Doublet

• Could this model explain the Matter/Antimatter asymmetrie observed in the Universe ?

• Full scan would involve 122 Mill. points, actual scan ~1%

• 1 point uses ~9.5 h CPU time -> distributed jobs

• Publication in preparation


CP Violating effects have been found to be small

Computing

Other activity: Radiobiology

• Collaboration with MedUni Vienna• Study of Linear Energy Transfer of

various Ions– Optimisation of cancer treatment at

new radiation facilities

• More then 108 particles have to be simulated

• Submitted to Z Med Phys


Example of LET with different ions as simulated

Computing

Current Issues

• Electricity costs charged to the Institute since 2010– Significant load to our stretched budget– We are not able to operate all our equipment– In 2011 we will not operate at foreseen size – We have asked the Academy to retender our electricity contract; discussions are

ongoing

• EGEE has been replaced by a new structure, the European Grid Initiative EGI

– Other partners in grid computing left the field in Austria– No National Grid Initiative has been established– EGI membership fee is prohibitive for us (40 K Euro/year)– We are in discussion with EGI and CERN

• Current Hardware will take us until 2011/2012– End of lifetime


Computing

Regional WLCG Tier-2 Workshop

• Innsbruck, Vienna, Budapest, Debrezin

• About 30 participants• Intense discussion on

the future

• Requirements and plans for the next years were presented


Computing

Future requirements

• CMS requirements will be growing over the years• Belle II will require also computing• Main Assumption: constant budget, 30% increase of

capacity each year (given by Moore‘s law)


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Consolidations in the Austrian Computing Landscape

• Vienna Super Computer (VSC)– Univ., Univ. Of Technology, Boku Vienna

• Austrian Center for Scientific Computing (ACSC)– Univ. Innsbruck, Linz and Salzburg

• ACSC aims to be common framework– We joined ACSC as guests, aim for membership– Relation of VSC and ACSC has still to be clarified– I lead the Grid & Cloud Working Group


Computing

Consolidation

• High Energy Physics requires somehow different setups then HPC– Large Data Storage

– Collaboration with international partners (grid)

• Nevertheless many common aspects– We aim to integrate our Tier-2 in a larger HPC Center

• We are looking for partners– Stefan Maier Institiute: PANDA Experiment at the FAIR Collider

– Others might be possible

• Specific funding for particle physics computing will be required


Computing

Hosting at the VSC

• We have discussed a hosting scenario with the VSC group from the Technical University

• Place, Energy, Networking, Cooling would be available– 5 racks– Up to 50 kW Power– 10 Gbit Network (2 to 3 Gbit sustained)

• With new hardware we could move there by 2012– The open issue is the funding


Computing

Summary

• Tier-2 is operational and allows us to participate in the analysis of data– Important for our physics analysis

– Important for our position in the CMS collaboration

• Electricity costs prohibitive to operate Tier-2 at available size

• We need a new solution for 2012, when the hardware gets obsolete

• We study the issue in the context of the ACSC

• VSC could be an ideal place to host a particle physics cluster


21 october 2010 dietrich liko grid tier-2 hephy scientific advisory board

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