Data Base and Computing Resources Management
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1 Data Base and Computing Resources Management Harut Avakian(JLab) "CLAS12 Ready for Science" Review September Clas12 databases(ccdb/rcdb) Policies for clas12 dbases ccdb rcdb Sharing resources between groups Summary 1
2 From clas6 to clas12 Lessons learnt from ~20 years of clas6 data analysis most relevant for resources management: Most of the clas12 experiments continue clas6 physics program (clas6 data analysis may continue) The role of MC simulation has increased significantly in planning and analysis of experiments (also hardest to control) Detailed Geant simulation is crucial for clas12 studies in general, and studies of the nucleon 3D structure in particular Standardizing user software (calibration, DST production, data analysis), requiring significant initial efforts will pay back in future Compromise between user freedom and strict control of storing and retrieving and recording of the relevant data is critical to optimize the data analysis 2
3 Requirements for storing the critical content All relevant constants related to detector geometry, simulation, calibration and reconstruction should be stored in the corresponding databases (online or offline) All database access programs should be from official library using standard programs from JLab git (projects, teams with clas12). Monitoring of integrity of constant sets is important Policies should clearly state who can write what and where, limiting input of critical content (ex. calibration constants for production cooking) to limited number of people (analysis coordinators or people assigned by them). H. Avakian, Ready for Science Review 3
4 Database requirements clas12 uses databases developed and tested by Hall-D: ccdb (offline) and rcdb (online) Simulation and reconstruction programs should use sets of geometry, calibration constants and online info from ccdb/rcdb ONLY! Production cooking use run group frozen variations from ccdb (under development) The run information from online provided by the offline mirror of the online rcdb Updating the online dbase only by manager Monitoring of integrity of constant sets -> rungroup responsibility H. Avakian, Ready for Science Review 4
5 clas12 databases H. Avakian, Ready for Science Review 5
6 Basic Information about the CLAS12 Constants Database mysql server host: clasdb.jlab.org user: clas12reader database: clas12 web viewer: ccdb (calibration constants database) calibration constants geometry parameters DAQ tables 6
7 Accessing sets from different sources 7
8 CLAS12 Run Condition Database 8
9 CLAS12 Run Condition Database RCDB (mirrored offline) with web interface available at 9
10 CLAS12 Requirements Values used in estimate calculations: event rate 10 khz 24-hr duty cycle 60% core efficiency 90% data MC calibra,on data MC reconstruction processing time per event per core 120 ms * number of reconstruction passes 2 ratio of simulated to data events 6 simulation time per event per core 500 ms * number of MC passes 1.5 o fraction of data for calibration 5 % o calibration processing time per event per core 50 ms o number of calibration passes 5 If we keep everything if raw event (Mode 1) size 80 kbyte decoded raw event size ~raw mode size / 10 = 8 kbyte reconstructed event size ~decoded size * 4 = 32 kbyte evio event size 20 kbyte hipo event size ~ evio event size / 4 = 5 kbyte reconstructed event size ~ converted size * 4 = 20 kbyte * un-optimized values (depends on B-field swimming step size, nb of tracks and Bkg.) Core Requirements Number of Cores Days for Data Cooking 1600 Number of Cores Days for Simula,on 7500 Number of Cores Days for MC Cooking 1800 Number of Cores Days for Calibra,on 83 Total for 1 day Storage Requirements [in TB per day of running] DAQ data volume 41 Raw data volume 4 Cooked data volume 17 Simulated evio data volume 16 Simulated hipo data volume 4 Cooked Simulated data volume 16 Calibrated data volume 1 Total data volume in TB for 1 day 97 10
11 From clas6 to clas12 Scicomp Work Disk (Gb) prad: hps: 9001 clasg12: 7851 claseg1dvcs: 4282 clase1dvcs: Sharing of resources done using quotas and priorities done by cc upon request Should try better scheduling to use farm more efficiently 11
12 From clas6 to clas12 Two decades of clas6 data analysis: /mss/clas/bonus /mss/clas/dvcs /mss/clas/e1-6 /mss/clas/e1a/ /mss/clas/e1b/ /mss/clas/e1c/ /mss/clas/e1d/ /mss/clas/e1e/ /mss/clas/e1f/ /mss/clas/e1g/ /mss/clas/e2a/ /mss/clas/e2b/ /mss/clas/e5a/ /mss/clas/e6a/ /mss/clas/eg1a /mss/clas/eg1b /mss/clas/eg1d /mss/clas/eg2a /mss/clas/eg3a /mss/clas/eg4a /mss/clas/eg6/ /mss/clas/g10a /mss/clas/g11/ /mss/clas/g11a /mss/clas/g12/ /mss/clas/g13/ /mss/clas/g14a /mss/clas/g14b /mss/clas/g1a/ /mss/clas/g1b/ /mss/clas/g1c/ /mss/clas/g2a/ /mss/clas/g2b/ /mss/clas/g3a/ /mss/clas/g6b/ /mss/clas/g6c/ /mss/clas/g7a/ /mss/clas/g8a/ /mss/clas/g8b/ /mss/clas/g9a/ /mss/clas/g9fr /mss/clas/prim /mss/clas/tpe/ /mss/clas/caa /mss/clas/eg1dvcs /mss/clas12/clas12-testing /mss/clas12/rg-a /mss/clas12/rg-b /mss/clas12/rg-c /mss/clas12/kpp /mss/clas12/detectors /mss/clas12/calibration in Run Group A: 7 PAC-approved experiments (+ 4 run-group proposals + CAAs) With x10 Lumi, better control/monitoring over usage of resources will be needed 12
13 Summary ccdb implemented by CLAS12 collaboration and worked successfully in 2017 for data calibration and simulation/ reconstruction chain rcdb has been implemented in online, and mirror in offline has been used to get the relevant online data Due to large number of sub-groups monitoring of constants integrity is crucial Clear policy for quotas and priorities for access to farm resources will be important, in particular in case of limited online resources (disk, tapes, cores) Plans: Finalize ccdb access, and rcdb API (java) 13
14 Support slides 14
15 CLAS12 Data Flow (online farm proposed) Computer Center ROCs (~110) E 40Gb ET ER Disk Disk/Tape B Data monitoring (2 servers) 40Gb Data Monitoring Results 40Gb Farm Online Farm Counting House
16 Dbase structure CLAS6 (clasdb) main run index run index TOF-A run index TOF-B CLAS12(ccdb) variation-tof-a System/subS#1.. System/subS#2.. System/subS#1.. System/subS#2.. System/subS#1.. System/subS#2.. System/subS#1.. System/subS#2.. System/subS-TOF version-a System/subS-TOF default System/subS-TOF version-a System/subS-TOF version-b System/subS-TOF default variation-tof-b System/subS#N.. System/subS#N.. System/subS#N.. System/subS#N.. System/subS-TOF version-b More efficient organiza,on: run indexes vs varia,ons Requires bemer monitoring to avoid confusion
17 ccdb: constant monitoring Java - API for CLAS12 Calibration database ex. from clas6:monitoring tools..
18 TODO list develop the high level Java-API develop the high level C++ API finalize database writing policies define the variation lock procedure develop the scripts for ccdb input..
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