1. MonteCarlo production for the BaBar experiment on the Italian grid
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MonteCarlo production for the BaBar experiment on the Italian grid
Fourth INFN Grid Workshop
Bari, October

2. MonteCarlo production for the BaBar experiment on the Italian grid
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Introduction
The production of simulated events for the BaBar experiment is a
distributed task involving several computing farms spread around
the world:
production of Monte-Carlo events distributed over 25 sites
data transferred to SLAC
each remote farm is managed by a local production manager
on each farm the whole BaBar software release installation is required (~1.5 GBytes.)
an object-oriented database, Objectivity, is used to read detector conditions and calibration constants, while ROOT I/O is used to mix real background triggers with the simulated events
MonteCarlo production for the BaBar experiment on the Italian grid

3. MonteCarlo production for the BaBar experiment on the Italian grid
BaBar-Grid
A new approach for MonteCarlo production in
BaBar:
Spread the software for MonteCarlo simulation over grid sites
Install data needed for simulation on a dedicated host
MonteCarlo production for the BaBar experiment on the Italian grid

4. MonteCarlo production for the BaBar experiment on the Italian grid
BaBar-Grid
Data needed for simulation are both installed on the
same host:
Conditions data are stored in a object oriented database (~30GBytes) and supplied by an AMS server. Each simulation job reads about 1/50 of the total amount.
Background triggers are provided by an Xrootd server and stored as ROOT files (about 2 GBytes each).
A typical production job consists of 2000 events
MonteCarlo production for the BaBar experiment on the Italian grid

5. MonteCarlo production for the BaBar experiment on the Italian grid
BaBar-Grid
BaBar software dedicated to event simulation has been extracted from the whole release (~130 MB) and installed on several sites of the grid. A special tag has been created for those sites used for production
Objectivity databases for conditions data and background triggers have been installed in Ferrara, Padua and Naples
A dedicated RB has been installed in Ferrara and used to submit production jobs
MonteCarlo production for the BaBar experiment on the Italian grid

6. BaBar resources on the grid
MonteCarlo production for the BaBar experiment on the Italian grid

7. MonteCarlo production for the BaBar experiment on the Italian grid
BaBar-Grid
Jobs submitted on sites which published the special tag created for the BaBar software
Data shipped to the SE located in Ferrara
Standard BaBar software tools for simulation production, needed to merge and transfer data to SLAC, are installed on the UI
MonteCarlo production for the BaBar experiment on the Italian grid

8. MonteCarlo production for the BaBar experiment on the Italian grid
Production schema
MonteCarlo production for the BaBar experiment on the Italian grid

9. MonteCarlo production for the BaBar experiment on the Italian grid
Results
Pre-production tests perfomed:
Executed 200 jobs for each test
About 140 parallel jobs on a single Objy database
Jobs successful completed: 98%
MonteCarlo production for the BaBar experiment on the Italian grid

10. MonteCarlo production for the BaBar experiment on the Italian grid
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Conclusions
Performances are quite satisfying
Scalability depends on data location
Close to real production
MonteCarlo production for the BaBar experiment on the Italian grid