A CUDA implementation of the High Performance Conjugate Gradient benchmark

Everett Phillips, Massimiliano Fatica
NVIDIA Corporation, Santa Clara, CA 95050, USA
5th International Workshop on Performance Modeling, Benchmarking and Simulation of High Performance Computer Systems (PMBS14), 2014


   title={A CUDA implementation of the High Performance Conjugate Gradient benchmark},

   author={Phillips, Everett and Fatica, Massimiliano},



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The High Performance Conjugate Gradient (HPCG) benchmark has been recently proposed as a complement to the High Performance Linpack (HPL) benchmark currently used to rank supercomputers in the Top500 list. This new benchmark solves a large sparse linear system using a multigrid preconditioned conjugate gradient (PCG) algorithm. The PCG algorithm contains the computational and communication patterns prevalent in the numerical solution of partial differential equations and is designed to better represent modern application workloads which rely more heavily on memory system and network performance than HPL. GPU accelerated supercomputers have proved to be very effective, especially with regard to power efficiency, for accelerating compute intensive applications like HPL. This paper will present the details of a CUDA implementation of HPCG, and the results obtained at full scale on the largest GPU supercomputers available: the Cray XK7 at ORNL and the Cray XC30 at CSCS. The results indicate that GPU accelerated supercomputers are also very effective for this type of workload.
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