Oct 12 – 16, 2015
Brookhaven National Laboratory
America/New_York timezone

Simulating 5 Trillion Events on the Open Science Grid

Oct 12, 2015, 2:00 PM
Bldg. 510 - Physics Department Large Seminar Room (Brookhaven National Laboratory)

Bldg. 510 - Physics Department Large Seminar Room

Brookhaven National Laboratory

Upton, NY 11973
Grid, Cloud & Virtualisation Grid, Cloud and Virtualization


Martin Lothar Purschke (Brookhaven National Laboratory (US))


We report on a simulation effort using the Open Science Grid which utilized a large fraction of the available OSG resources for about 13 weeks in the first half of 2015. sPHENIX is a proposed upgrade of the PHENIX experiment at the Relativistic Heavy Ion Collider. We have collected large data sets of proton-proton collision data in 2012 and 2013, and plan to carry out a similar study with upgraded sPHENIX detector further into the 2020s. One important aspect of the study is to understand the different contributions for the forward production of muons that are measured in the detector. This requires a large-scale PYTHIA simulation that matches the integrated luminosity of the PHENIX 2013 data set (about 5000 Billion collisions). Since there is no way to pre-select the different parton-level collision types, the simulation selects minimum-bias collisions and then discards those which are not of the desired topology, leading to an acceptable I/O-to-CPU ratio. This made this simulation ideal to be run on the Grid. The Open Science Grid opened up the possibility of carrying out this simulation in a reasonable time frame. The project used about 5 million CPU hours total. We will report on the experience running the jobs on the OSG, and describe the steps there were taken to automate the production in such a way that the entire simulation could be run by one person.
Length of presentation (max. 20 minutes) 15

Primary author

Martin Lothar Purschke (Brookhaven National Laboratory (US))

Presentation materials