starpu-max/examples/basic_examples/multiformat_conversion_codelets_cuda.cu

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2011-2020  Université de Bordeaux, CNRS (LaBRI UMR 5800), Inria
 *
 * StarPU is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * StarPU is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU Lesser General Public License in COPYING.LGPL for more details.
 */

#include <starpu.h>
#include "multiformat_types.h"

static __global__ void cpu_to_cuda_cuda(struct point *src,
	struct struct_of_arrays *dst, unsigned n)
{
        unsigned i =  blockIdx.x*blockDim.x + threadIdx.x;

	if (i < n)
	{
		dst->x[i] = src[i].x;
		dst->y[i] = src[i].y;
	}

}

extern "C" void cpu_to_cuda_cuda_func(void *buffers[], void *_args)
{
	struct point *src;
	struct struct_of_arrays *dst;

	src = (struct point *) STARPU_MULTIFORMAT_GET_CPU_PTR(buffers[0]);
	dst = (struct struct_of_arrays *) STARPU_MULTIFORMAT_GET_CUDA_PTR(buffers[0]);

	int n = STARPU_MULTIFORMAT_GET_NX(buffers[0]);

	unsigned threads_per_block = 64;
	unsigned nblocks = (n + threads_per_block-1) / threads_per_block;

        cpu_to_cuda_cuda<<<nblocks,threads_per_block,2,starpu_cuda_get_local_stream()>>>(src, dst, n);
}