Accelerating QDP++/Chroma on GPUs

Details Accelerating QDP++/Chroma on GPUs Accelerating QDP++/Chroma on GPUs

2011-11-23

arxiv.org/abs/1111.5596v1

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 4 figures; Talk given at the XXIX International Symposium on Lattice Field Theory - Lattice 2011, Lake Tahoe, Califor

Scientific paper

Extensions to the C++ implementation of the QCD Data Parallel Interface are provided enabling acceleration of expression evaluation on NVIDIA GPUs. Single expressions are off-loaded to the device memory and execution domain leveraging the Portable Expression Template Engine and using Just-in-Time compilation techniques. Memory management is automated by a software implementation of a cache controlling the GPU's memory. Interoperability with existing Krylov space solvers is demonstrated and special attention is paid on 'Chroma readiness'. Non-kernel routines in lattice QCD calculations typically not subject of hand-tuned optimisations are accelerated which can reduce the effects otherwise suffered from Amdahl's Law.

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