1. Belle II Computing Fabrizio Bianchi INFN and University of Torino Meeting Belle2 Italia 17/12/2014

2. Computing Summary Status of Belle II Computing (FB) – Belle II computing model – Resorce estimate – Computing and activities in Italy Collaborative Tools (F. Forti) Networking and Belle II Computing at Napoli- ReCaS ( S. Pardi) Belle II computing at Pisa (E. Mazzoni) 2014/07/18F. Bianchi2

3. Belle II Computing Model (1) Outline of central production: – Raw data permanently stored on tape – Calibrated and processed to produce mDST – MC events processed in the same way – Detector and MC data skimmed to create subset of events (skims) targeting a set of physical analysis – Data challenges to test the system before the data taking Tiered structure: – Raw Data Centers (KEK, PNNL, GridKa, CNAF, KISTI, etc.): where the raw data are stored and processed. “Raw Data Centers” also serve as "Regional Data Centers" and "MC Production Sites". – Regional Data Centers (DESY, INFN Tier2 Federation, etc.): large computing centers where a (partial) copy of the mDST data is stored. "Regional Data Centers" also serves as "MC Production Sites". – MC Production Sites: where MC production/reconstruction and physics analysis is performed 2014/07/18F. Bianchi3

4. Belle II Computing Model (2) Two copies of raw data – First copy at KEK – Second copy distributed: 30% PNNL, 20% each Italy and Germany, 30% Asia (?) 4 copies of miniDST for Data – KEK, America, Europe and eventually Asia 3 copy of miniDST for MC – Where it was produced + two replicas (one in Europe) Processing: 60% at KEK, 40% distributed Reprocessing: were second copy of raw data is. – Plan: until 2019 included, second copy and reprocessing only at PNNL MC Production & Analysis: everywhere according to PhD fraction 2014/07/18F. Bianchi4

5. Assumptions to Estimate Resources Luminosity Cross section: 7.5 nb (5.0 nb) for data (MC) Sizes of event in raw data from DAQ people: 300 KB Size of event in miniDST from estimate/measurement: 45 KB CPU for Reco (MC generation and reconstruction) from current code: 45 (90) HEPSpec x sec /evt for data (MC) Storage and CPU for Analysis from scaled Belle experience – Storage as a mDST copy – CPU power as half of a raw data processing Two versions of mDST on disk – The one under production plus previous one Reprocessing: – 4 in first and second year of data taking – 2 in third year – One reprocessing every 2 years after that 2014/07/18F. Bianchi5

6. Stima Risorse (inizio Presa Dati 01/2018) 2014/07/18F. Bianchi6

7. Tuning dei Parametri (1) 2014/07/18F. Bianchi7

8. Tuning dei Parametri (2) 2014/07/18F. Bianchi8

9. Stima Risorse (inizio Presa Dati 01/2018) Tuning Parametri 2014/07/18F. Bianchi9

10. 2014/07/18F. Bianchi10

11. 2014/07/18F. Bianchi11

12. Analysis Data Model BaBar vs Belle II 2014/07/18F. Bianchi12 BaBarBelle II Input AnalisiMicro-DSTMini-DST Skimmed EventsMicro-DST + User DataMiniDST + User Data = Micro-DST Output AnalysisN-tuple Analysis Data (BelleII) = Skims + user n-tuples

13. 2014/07/18F. Bianchi13

14. Stima Risorse (inizio Presa Dati 01/2018) Tuning Parametri Analisi BaBar-like 2014/07/18F. Bianchi14

15. Stima Risorse (inizio Presa Dati 01/2018) Tuning Parametri Analisi BaBar-like 2014/07/18F. Bianchi15

16. Change in the Italian PhD Fraction 2014/07/18F. Bianchi16

17. Proposed Belle II Computing Infrastructure in Italy Our request: resources at CNAF and in a Tier2 Federation (Napoli - ReCaS, Pisa and Torino) Roles according to Belle II computing model: – Raw Data Center: CNAF – Regional Data Center: CNAF + Tier2 Federation – MC Production Sites: CNAF + Tier2 Federation + opportunistic use of available resources At CNAF: – 40% of resources for MC production and analysis – Starting in 2020: INFN share of raw data (including CPU to process them) In the Tier2 Federation: – 60% of resources for MC production and analysis shared between Napoli, Pisa and Torino – Resources allocate to Belle II in different Tier2 sites should be comparable – Add resources only in a site each year and rotate among sites. 2014/07/18F. Bianchi17

18. What We Have Done So Far Web site: https://web2.infn.it/Belle-II/https://web2.infn.it/Belle-II/ Belle VO active at CNAF, Frascati, Legnaro-Padova, Napoli, Pisa, Roma3, Torino. – Will add Roma3 and other ReCaS site. MoU on quality of Grid services has been signed. Contributing to the MC production and to network bandwidth test (S. Pardi, Napoli) 2014/07/18F. Bianchi18

19. Fall 2014 MC Campaign Pisa 7.0% Napoli 4.7% CNAF 3.1% Frascati 2.6% Legnaro 0.5% Torino 0.5 % 2014/07/18F. Bianchi19

20. Outlook BelleII computing model is still evolving – Injection of realism + experience from non- KEK experiments Additional manpower on computing tools is much needed Increase the Italian participation to software quality shifts and to MC production shift 2014/07/18F. Bianchi20

21. Backup 2014/07/18F. Bianchi21