starpu-max/tests/datawizard/interfaces/vector/test_vector_cuda.cu

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2011,2012                                Inria
 * Copyright (C) 2011,2012,2015,2017                      CNRS
 *
 * 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 "../test_interfaces.h"

extern struct test_config vector_config;

__global__ void framework_cuda(int *val, unsigned n, int *err, int factor)
{
        unsigned i =  blockIdx.x*blockDim.x + threadIdx.x;

	if (i >= n)
		return;

	if (val[i] != i*factor)
		*err = 1;
	else
		val[i] = -val[i];
}

extern "C" void test_vector_cuda_func(void *buffers[], void *args)
{
	cudaError_t error;
	int *ret;

	error = cudaMalloc(&ret, sizeof(int));
	if (error != cudaSuccess)
	{
		fprintf(stderr, "cudaMalloc failed...\n");
		return;
	}

	error = cudaMemcpyAsync(ret, &vector_config.copy_failed, sizeof(int), cudaMemcpyHostToDevice, starpu_cuda_get_local_stream());
	if (error != cudaSuccess)
		return;

        unsigned n = STARPU_VECTOR_GET_NX(buffers[0]);
        int *val = (int *)STARPU_VECTOR_GET_PTR(buffers[0]);
	int factor = *(int*) args;

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

        framework_cuda<<<nblocks,threads_per_block,0,starpu_cuda_get_local_stream()>>>(val, n, ret, factor);
	error = cudaMemcpyAsync(&vector_config.copy_failed, ret, sizeof(int), cudaMemcpyDeviceToHost, starpu_cuda_get_local_stream());
	if (error != cudaSuccess)
	{
		return;
	}

	cudaFree(ret);
	cudaStreamSynchronize(starpu_cuda_get_local_stream());
}