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Future Software Needs

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

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Future Software Needs

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

  2. progress so far HDGeant4 project: work plan • Download and install a recent stable release of G4 • Create a template from one of the standard examples • Design classes for geometry import from hdds • Implement geometry import from hdds • Make a set of scripts to generate some standard views of GlueX • Implement the particle gun event generator • Design classes for reading Monte Carlo events from hddm stream • Implement Monte Carlo event input • Design classes for internal cobrems generator • Implement and test the internal cobrems generator • Create and document a standard input control file for a few common scenarios • Set up mechanisms for verbose tracking output • Design classes for hits collection and output • Implement hits collection and output to hddm • Implement the history mechanism for generating useful truth information • Begin the process of porting hits code from hdgeant to hdgeant4 GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  3. HDGeant4 : first look with G4 vis GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  4. HDGeant4 : first look with G4 vis GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  5. HDGeant4 : upstream closeup addCutawayPlane GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  6. HDGeant4 : more cutaway views GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  7. HDGeant4 : more cutaway views GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  8. HDGeant4 : more cutaway views GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  9. HDGeant4 : more cutaway views GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  10. HDGeant4 : views of the pair spectrometer GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  11. HDGeant4 : views of the pair spectrometer old asymmetric readout design is still in the simulation geoemtry GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  12. HDGeant4 : next steps • The geometry has accumulated defects since the original implementation in hdds • example: readout cables from CDC are completely outside of their mother volume! • 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. • Next step: work through geometry defects and fix them one by one – time consuming but essential. • Remaining steps: 5 – 10 days of work GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  13. 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, 2012

  14. OSG Weekly Usage by all VO’s GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  15. OSG Usage History by GlueX Date range: 2009-9-1 - 2012-05-21 GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  16. UConn Site Usage History by OSG Date range: 2009-9-1 - 2012-05-21 GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  17. OSG Usage History by Gluex Date range: 2009-9-1 - 2012-05-21 wallclock hours GlueX Collaboration Meeting, Newport News, May 21-23, 2012

  18. OSG All-Hands Meeting – Gluex slide run periodusage 9/2009 – 9/2010 26.4 khr 9/2010 – 9/2011 1.1 Mhr 9/2011 – present 2.1 Mhr GlueX Collaboration Meeting, Newport News, May 21-23, 2012 Gluex VO created 9/2009 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: simulation of background QCD photoproduction (Pythia) 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. 2015. Strategy: glideinWMS – support from OSG admins outstanding !

  19. 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, 2012

  20. 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, 2012

  21. Exploiting cheap GPUs for PWA Latest news: development at UConn of a new 5p PWA generator based on Matt Shepherd’s AmpTools package with 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============  ==========  ========================  ========================   2.800000e-13  0.0000080    -2.298916e-08    2.625512e-08   -2.298916e-08    2.625484e-08  1.166190e-12  0.0000030    -3.518453e-07   -1.532152e-07   -3.518443e-07   -1.532146e-07  1.648423e-12  0.0001306     7.594444e-09   -1.008245e-08    7.593624e-09   -1.008102e-08  2.239863e-12  0.0005734    -3.334717e-09   -2.034811e-09   -3.336553e-09   -2.036094e-09  3.032227e-12  0.0000156    -1.841378e-07   -6.039711e-08   -1.841351e-07   -6.039573e-08  1.040433e-11  0.0000043    -2.394655e-06    1.663630e-07   -2.394661e-06    1.663715e-07  1.204159e-11  0.0000058    -1.260541e-06    1.662465e-06   -1.260529e-06    1.662466e-06  1.352122e-11  0.0000101    -1.337222e-06   -9.173907e-09   -1.337235e-06   -9.177625e-09  1.414214e-11  0.0000020     6.550594e-06    2.532435e-06    6.550580e-06    2.532437e-06  1.469193e-11  0.0000991     1.477365e-07   -1.291444e-08    1.477507e-07   -1.291821e-08 Event selection is essentially identical using either CPU (dp) or GPU (sp) GlueX Collaboration Meeting, Newport News, May 21-23, 2012

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