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grid_potential_GPU.cu
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Thu, Oct 10, 19:47

grid_potential_GPU.cu
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/**
* @Author Christoph Schaefer, EPFL (christophernstrerne.schaefer@epfl.ch), Gilles Fourestey (gilles.fourestey@epfl.ch)
* @date July 2017
* @version 0,1
*
*/
#include <fstream>
#include "grid_gradient2_GPU.cuh"
#include "gradient2_GPU.cuh"
#include <structure_hpc.hpp>
#define BLOCK_SIZE_X 32
#define BLOCK_SIZE_Y 16
//#define ROT
#define _SHARED_MEM
#ifdef _SHARED_MEM
#define SHARED __shared__
#warning "shared memory"
extern __shared__ type_t shared[];
#else
#define SHARED
#endif
#define Nx 1
#define Ny 0
#define cudasafe
extern "C"
{
type_t myseconds();
}
__global__ void
module_potential_totalPotential_SOA_GPU(type_t *potential_GPU, const struct Potential_SOA *lens, const struct grid_param *frame, int nhalos, type_t dx, type_t dy, int nbgridcells_x, int nbgridcells_y, int istart, int jstart);
////
void
module_potential_SOA_CPU_GPU(type_t *grid_potential, const struct grid_param *frame, const struct Potential_SOA *lens_gpu, int nhalos, type_t dx, type_t dy, int nbgridcells_x, int nbgridcells_y, int istart, int jstart);
void
potential_grid_GPU(type_t *grid_potential, const struct grid_param *frame, const struct Potential_SOA *lens, int nhalos, type_t dx, type_t dy, int nbgridcells_x, int nbgridcells_y, int istart, int jstart);
//
//void
//module_potentialDerivatives_totalGradient_SOA_CPU_GPU_v2(double *grid_grad_x, double *grid_grad_y, const struct grid_param *frame, const struct Potential_SOA *lens_cpu, const struct Potential_SOA *lens_gpu, int nbgridcells, int nhalos);
//
//
//
void potential_grid_GPU(type_t *grid_potential, const struct grid_param *frame, const struct Potential_SOA *lens, int nhalos ,int nbgridcells)
{
type_t dx = (frame->xmax - frame->xmin)/(nbgridcells - 1);
type_t dy = (frame->ymax - frame->ymin)/(nbgridcells - 1);
//
potential_grid_GPU(grid_potential, frame, lens, nhalos, dx, dy, nbgridcells, nbgridcells, 0, 0);
}
//
//
//
void potential_grid_GPU(type_t *grid_potential, const struct grid_param *frame, const struct Potential_SOA *lens, int nhalos, type_t dx, type_t dy, int nbgridcells_x, int nbgridcells_y, int istart, int jstart)
{
int nBlocks_gpu = 0;
// Define the number of threads per block the GPU will use
cudaDeviceProp properties_gpu;
cudaGetDeviceProperties(&properties_gpu, 0); // Get properties of 0th GPU in use
grid_param *frame_gpu;
Potential_SOA *lens_gpu,*lens_kernel;
int *type_gpu;
type_t *lens_x_gpu, *lens_y_gpu, *b0_gpu, *angle_gpu, *epot_gpu, *rcore_gpu, *rcut_gpu, *anglecos_gpu, *anglesin_gpu;
type_t *grid_potential_gpu;
lens_gpu = (Potential_SOA *) malloc(sizeof(Potential_SOA));
lens_gpu->type = (int *) malloc(sizeof(int));
// Allocate variables on the GPU
cudasafe(cudaMalloc( (void**)&(lens_kernel), sizeof(Potential_SOA)),"grid_potential_GPU.cu : Alloc Potential_SOA: " );
cudasafe(cudaMalloc( (void**)&(type_gpu), nhalos*sizeof(int)),"grid_potential_GPU.cu : Alloc type_gpu: " );
cudasafe(cudaMalloc( (void**)&(lens_x_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc x_gpu: " );
cudasafe(cudaMalloc( (void**)&(lens_y_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc y_gpu: " );
cudasafe(cudaMalloc( (void**)&(b0_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc b0_gpu: " );
cudasafe(cudaMalloc( (void**)&(angle_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc angle_gpu: " );
cudasafe(cudaMalloc( (void**)&(epot_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc epot_gpu: " );
cudasafe(cudaMalloc( (void**)&(rcore_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc rcore_gpu: " );
cudasafe(cudaMalloc( (void**)&(rcut_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc rcut_gpu: " );
cudasafe(cudaMalloc( (void**)&(anglecos_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc anglecos_gpu: " );
cudasafe(cudaMalloc( (void**)&(anglesin_gpu), nhalos*sizeof(type_t)),"grid_potential_GPU.cu : Alloc anglesin_gpu: " );
cudasafe(cudaMalloc( (void**)&(frame_gpu), sizeof(grid_param)),"grid_potential_GPU.cu : Alloc frame_gpu: " );
cudasafe(cudaMalloc( (void**)&(grid_potential_gpu), (nbgridcells_x) * (nbgridcells_y) *sizeof(type_t)),"grid_potential_GPU.cu : Alloc source_a_gpu: " );
// Copy values to the GPU
//
cudasafe(cudaMemcpy(type_gpu,lens->type , nhalos*sizeof(int),cudaMemcpyHostToDevice ),"grid_potential_GPU.cu : Copy type_gpu: " );
cudasafe(cudaMemcpy(lens_x_gpu,lens->position_x , nhalos*sizeof(type_t),cudaMemcpyHostToDevice ),"grid_potential_GPU.cu : Copy x_gpu: " );
cudasafe(cudaMemcpy(lens_y_gpu,lens->position_y , nhalos*sizeof(type_t), cudaMemcpyHostToDevice),"grid_potential_GPU.cu : Copy y_gpu: " );
cudasafe(cudaMemcpy(b0_gpu,lens->b0 , nhalos*sizeof(type_t), cudaMemcpyHostToDevice),"grid_potential_GPU.cu : Copy b0_gpu: " );
cudasafe(cudaMemcpy(angle_gpu,lens->ellipticity_angle , nhalos*sizeof(type_t), cudaMemcpyHostToDevice),"grid_potential_GPU.cu : Copy angle_gpu: " );
cudasafe(cudaMemcpy(epot_gpu, lens->ellipticity_potential, nhalos*sizeof(type_t),cudaMemcpyHostToDevice ),"grid_potential_GPU.cu : Copy epot_gpu: " );
cudasafe(cudaMemcpy(rcore_gpu, lens->rcore, nhalos*sizeof(type_t),cudaMemcpyHostToDevice ),"grid_potential_GPU.cu : Copy rcore_gpu: " );
cudasafe(cudaMemcpy(rcut_gpu, lens->rcut, nhalos*sizeof(type_t), cudaMemcpyHostToDevice),"grid_potential_GPU.cu : Copy rcut_gpu: " );
cudasafe(cudaMemcpy(anglecos_gpu, lens->anglecos, nhalos*sizeof(type_t),cudaMemcpyHostToDevice ),"grid_potential_GPU.cu : Copy anglecos: " );
cudasafe(cudaMemcpy(anglesin_gpu, lens->anglesin, nhalos*sizeof(type_t), cudaMemcpyHostToDevice),"grid_potential_GPU.cu : Copy anglesin: " );
cudasafe(cudaMemcpy(frame_gpu, frame, sizeof(grid_param), cudaMemcpyHostToDevice),"grid_potential_GPU.cu : Copy frame_gpu: " );
//
lens_gpu->type = type_gpu;
lens_gpu->position_x = lens_x_gpu;
lens_gpu->position_y = lens_y_gpu;
lens_gpu->b0 = b0_gpu;
lens_gpu->ellipticity_angle = angle_gpu;
lens_gpu->ellipticity_potential = epot_gpu;
lens_gpu->rcore = rcore_gpu;
lens_gpu->rcut = rcut_gpu;
lens_gpu->anglecos = anglecos_gpu;
lens_gpu->anglesin = anglesin_gpu;
//
cudaMemcpy(lens_kernel, lens_gpu, sizeof(Potential_SOA), cudaMemcpyHostToDevice);
//
type_t time = -myseconds();
//
module_potential_SOA_CPU_GPU(grid_potential_gpu, frame_gpu, lens_kernel, nhalos, dx, dy, nbgridcells_x, nbgridcells_y, istart, jstart);
//
//cudasafe(cudaGetLastError(), "module_potentialDerivative_totalGradient_SOA_CPU_GPU");
cudaDeviceSynchronize();
time += myseconds();
//std::cout << " kernel time = " << time << " s." << std::endl;
//
cudasafe(cudaMemcpy( grid_potential, grid_potential_gpu, (nbgridcells_x)*(nbgridcells_y)*sizeof(type_t), cudaMemcpyDeviceToHost )," --- grid_potential_GPU.cu : Copy source_a_gpu: " ); //
//printf("-----> %f %f \n",grid_grad_x[Nx], grid_grad_y[Ny]);
// Free GPU memory
cudaFree(lens_kernel);
cudaFree(type_gpu);
cudaFree(lens_x_gpu);
cudaFree(lens_y_gpu);
cudaFree(b0_gpu);
cudaFree(angle_gpu);
cudaFree(epot_gpu);
cudaFree(rcore_gpu);
cudaFree(rcut_gpu);
cudaFree(anglecos_gpu);
cudaFree(anglesin_gpu);
cudaFree(grid_potential_gpu);
}
void
module_potential_SOA_CPU_GPU(type_t *grid_potential, const struct grid_param *frame, const struct Potential_SOA *lens_gpu, int nhalos, type_t dx, type_t dy, int nbgridcells_x, int nbgridcells_y, int istart, int jstart)
{
int GRID_SIZE_X = (nbgridcells_x + BLOCK_SIZE_X - 1)/BLOCK_SIZE_X; // number of blocks
int GRID_SIZE_Y = (nbgridcells_y + BLOCK_SIZE_Y - 1)/BLOCK_SIZE_Y;
//
printf("grid_size_x = %d, grid_size_y = %d, nbgridcells_x = %d, nbgridcells_y = %d, istart = %d, jstart = %d (split)\n", GRID_SIZE_X, GRID_SIZE_Y, nbgridcells_x, nbgridcells_y, istart, jstart);
//
dim3 threads(BLOCK_SIZE_X, BLOCK_SIZE_Y/1);
dim3 grid (GRID_SIZE_X , GRID_SIZE_Y);
//printf("nhalos = %d, size of shared memory = %lf\n", nhalos, (double) (8*nhalos + BLOCK_SIZE_X*nbgridcells/BLOCK_SIZE_Y)*sizeof(double));
printf("nhalos = %d, size of shared memory = %lf (split)\n", nhalos, (type_t) (8*nhalos + BLOCK_SIZE_X*BLOCK_SIZE_Y)*sizeof(type_t));
//
cudaMemset(grid_potential, 0, nbgridcells_x*nbgridcells_y*sizeof(type_t));
//
//module_potentialDerivatives_totalGradient_SOA_GPU<<<grid, threads>>> (grid_grad_x, grid_grad_y, lens, frame, nhalos, nbgridcells_x);
module_potential_totalPotential_SOA_GPU<<<grid, threads>>> (grid_potential, lens_gpu, frame, nhalos, dx, dy, nbgridcells_x, nbgridcells_y, istart, jstart);
cudasafe(cudaGetLastError(), "module_potential_totalPotential_SOA_GPU");
//
cudaDeviceSynchronize();
printf("GPU kernel done...\n");
}
//

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