Future Software Needs HDGeant4 project status MC simulation on the OSG Exploiting cheap GPUs for PWA Richard Jones – University of Connecticut GlueX Collaboration Meeting, Newport News, May 21-23, 2012

2 HDGeant4 project: work plan 1. Download and install a recent stable release of G4 2. Create a template from one of the standard examples 3. Design classes for geometry import from hdds 4. Implement geometry import from hdds 5. Make a set of scripts to generate some standard views of GlueX 6. Implement the particle gun event generator 7. Design classes for reading Monte Carlo events from hddm stream 8. Implement Monte Carlo event input 9. Design classes for internal cobrems generator 10. Implement and test the internal cobrems generator 11. Create and document a standard input control file for a few common scenarios 12. Set up mechanisms for verbose tracking output 13. Design classes for hits collection and output 14. Implement hits collection and output to hddm 15. Implement the history mechanism for generating useful truth information 16. Begin the process of porting hits code from hdgeant to hdgeant4 progress so far

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : first look with G4 vis

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : first look with G4 vis

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : upstream closeup addCutawayPlane

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : more cutaway views

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : more cutaway views

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : more cutaway views

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : more cutaway views

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : views of the pair spectrometer

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : views of the pair spectrometer old asymmetric readout design is still in the simulation geoemtry

GlueX Collaboration Meeting, Newport News, May 21-23, HDGeant4 : next steps The geometry has accumulated defects since the original implementation in hdds readout cables from CDC are completely outside of their mother volume! example: readout cables from CDC are completely outside of their mother volume! although the results are affected by them. Geant3 is largely blind to such defects, although the results are affected by them. Geant4 gets very worried by inconsistencies in the geometry – and crashes. time consuming but essential. Next step: work through geometry defects and fix them one by one – time consuming but essential. Remaining steps: 5 – 10 days of work Remaining steps: 5 – 10 days of work

GlueX Collaboration Meeting, Newport News, May 21-23, MC simulation on the OSG Total OSG capacity GlueX usage past and present GlueX in-kind contribution (UConn-OSG) Historical usage patterns: supply & demand

GlueX Collaboration Meeting, Newport News, May 21-23, OSG Weekly Usage by all VO’s

GlueX Collaboration Meeting, Newport News, May 21-23, Date range: OSG Usage History by GlueX

GlueX Collaboration Meeting, Newport News, May 21-23, Date range: UConn Site Usage History by OSG

GlueX Collaboration Meeting, Newport News, May 21-23, Date range: OSG Usage History by Gluex wallclock hours

GlueX Collaboration Meeting, Newport News, May 21-23, OSG All-Hands Meeting – Gluex slide Gluex VO Gluex VO created 9/2009 construction phase until 2014 Experiment is in construction phase until 2014 Usage increasing with demand for Monte Carlo Growth has slowed as work increases to digest the results Task: Task: simulation of background QCD photoproduction (Pythia) Purpose Purpose: develop cuts to suppress background, measure leakage from minimum-bias events into signal sample after cuts, requires very large statistics MC samples, shared between analysis tasks. Plans: saturate at the level 5-10M cpu.hr/yr until physics data collection begins ca Strategy: glideinWMS – support from OSG admins outstanding ! run periodusage 9/2009 – 9/ khr 9/2010 – 9/ Mhr 9/2011 – present2.1 Mhr

GlueX Collaboration Meeting, Newport News, May 21-23, Exploiting cheap GPUs for PWA The short story of what has been learned at UConn applying gpu’s to the PWA study of b1,p final state Igor Senderovich Jon Rifkin, UConn UITS

GlueX Collaboration Meeting, Newport News, May 21-23, Exploiting cheap GPUs for PWA factor x100 for amplitudes NVIDIA GTX-580 gamer gpu $420 on Newegg What about double precision?

GlueX Collaboration Meeting, Newport News, May 21-23, Exploiting cheap GPUs for PWA Latest news: development at UConn of a new 5p PWA generator based on Matt Shepherd’s AmpTools package with considerable customization is required… hooks for GPU – considerable customization is required… Question: Are there any hidden gotchas with amplitude generation in SP? ABS. ERROR REL. ERROR CPU AMPLITUDE GPU AMPLITUDE ============ ========== ======================== ======================== e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-08 Event selection is essentially identical using either CPU (dp) or GPU (sp)