Home > Publications database > Portable CPU implementation of Wilson, Brillouin and Susskind fermions in lattice QCD > print

001     1019542
005     20240109115103.0
024 7 _ |a 10.1016/j.cpc.2022.108555
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024 7 _ |a 1386-9485
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024 7 _ |a 1879-2944
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024 7 _ |a 10.34734/FZJ-2023-05489
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082 _ _ |a 530
100 1 _ |a Durr, Stephan
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245 _ _ |a Portable CPU implementation of Wilson, Brillouin and Susskind fermions in lattice QCD
260 _ _ |a Amsterdam
|c 2023
|b North Holland Publ. Co.
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520 _ _ |a A modern Fortran implementation of three Dirac operators (Wilson, Brillouin, Susskind) in lattice QCD is presented, based on OpenMP shared-memory parallelization and SIMD pragmas.The main idea is to apply a Dirac operator to $N_v$ vectors simultaneously, to ease the memory bandwidth bottleneck.All index computations are left to the compiler and maximum weight is given to portability and flexibility.The lattice volume, $N_x N_y N_z N_t$, the number of colors, $N_c$, and the number of right-hand sides, $N_v$, are parameters defined at compile time.Several memory layout options are compared.The code performs well on modern many-core architectures (480\,Gflop/s, 880\,Gflop/s, and 780\,Gflop/s with $N_v=12$for the three operators in single precision on a 72-core KNL processor, a $2 \times 24$-core Skylake node yields similar results).Explicit run-time tests with CG/BiCGstab inverters confirm that the memory layout is relevant for the KNL, but less so for the Skylake architecture.The ancillary code distribution contains all routines, including the single, double, and mixed precision Krylov space solvers, to render it self-contained and ready-to-use.
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536 _ _ |a DFG project 448374536 - Fortschritte bei einer präzisen ab initio Bestimmung der Partonen-Struktur von Hadronen (448374536)
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856 4 _ |y Published on 2022-09-26. Available in OpenAccess from 2024-09-26.
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856 4 _ |y Published on 2022-09-26. Available in OpenAccess from 2024-09-26.
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856 4 _ |y Published on 2022-09-26. Available in OpenAccess from 2024-09-26.
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