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LOCATION:Flüela
DTSTART;TZID=Europe/Stockholm:20230626T120000
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UID:submissions.pasc-conference.org_PASC23_sess176_pap115@linklings.com
SUMMARY:Towards Lattice QCD+QED Simulations on GPUs
DESCRIPTION:Paper\n\nRoman Gruber (ETH Zurich), Anton Kozhevnikov (ETH Zur
 ich / CSCS), Marina Marinkovic (ETH Zurich), and Thomas Schulthess and Raf
 faele Solca (ETH Zurich / CSCS)\n\nImproving the precision in particle phy
 sics predictions obtained from lattice simulations of quantum chromodynami
 cs (QCD) requires extension of the interactions considered thus far, leadi
 ng to additional computational demands. Most commonly used publicly availa
 ble program packages for efficient simulations of Wilson discretization of
  the Dirac operator are highly scalable on CPU hardware. In order to be ab
 le to run efficiently on existing and upcoming hybrid architectures, one n
 eeds to rethink the current strategy for data types used at different stag
 es of the simulation, most notably in frequent solves of the Dirac equatio
 n. We perform the first steps towards porting on GPUs of the three type of
  solvers used in the simulations of clover improved Wilson fermions: Conju
 gate Gradient, Schwarz preconditioned GCR solver, and a variant of the def
 lated solver. The analysis of the reduced precision data types' impact on 
 the convergence of each solver indicates several possibilities for overall
  performance improvement.\n\nDomain: Physics\n\nSession Chair: Sinéad Ryan
  (Trinity College, Hamilton Mathematics Institute)
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