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    Porting a Hall MHD Code to a Graphic Processing Unit (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We present our experience porting a Hall MHD code to a Graphics Processing Unit (GPU). The code is a 2nd order accurate MUSCL-Hancock scheme which makes use of an HLL Riemann solver to compute numerical fluxes and second-order finite differences to compute the Hall contribution to the electric field. The divergence of the magnetic field is controlled with Dedner?s hyperbolic divergence cleaning method. Preliminary benchmark tests indicate a speedup (relative to a single Nehalem core) of 58x for a double precision calculation. We discuss scaling issues which arise when distributing work across multiple GPUs in a CPU-GPU cluster.
    Keywords: Computer Programming and Software
    Type: GSFC.ABS.4778.2011 , 10th International School/Symposium for Space Simulations ISSS-10; Jul 24, 2011 - Jul 31, 2011; Banff, Alberta; Canada
    Format: application/pdf
    Location Call Number Expected Availability
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  • 2
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    A Simple GPU-Accelerated Two-Dimensional MUSCL-Hancock Solver for Ideal Magnetohydrodynamics (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: We describe our experience using NVIDIA's CUDA (Compute Unified Device Architecture) C programming environment to implement a two-dimensional second-order MUSCL-Hancock ideal magnetohydrodynamics (MHD) solver on a GTX 480 Graphics Processing Unit (GPU). Taking a simple approach in which the MHD variables are stored exclusively in the global memory of the GTX 480 and accessed in a cache-friendly manner (without further optimizing memory access by, for example, staging data in the GPU's faster shared memory), we achieved a maximum speed-up of approx. = 126 for a sq 1024 grid relative to the sequential C code running on a single Intel Nehalem (2.8 GHz) core. This speedup is consistent with simple estimates based on the known floating point performance, memory throughput and parallel processing capacity of the GTX 480.
    Keywords: Computer Programming and Software
    Type: GSFC-E-DAA-TN8735
    Format: application/pdf
    Location Call Number Expected Availability
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