starpu-max/tests/opt/datawizard/wt_broadcast.c

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2011  Université de Bordeaux 1
 *
 * 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>

#ifdef STARPU_USE_CUDA
#include <starpu_cuda.h>
#endif
#ifdef STARPU_USE_OPENCL
#include <starpu_opencl.h>
#endif


static unsigned var = 0;
static starpu_data_handle handle;
/*
 *	Increment codelet
 */

#ifdef STARPU_USE_OPENCL
/* dummy OpenCL implementation */
static void increment_opencl_kernel(void *descr[], void *cl_arg __attribute__((unused)))
{
	cl_mem d_token = (cl_mem)STARPU_VARIABLE_GET_PTR(descr[0]);
	unsigned h_token;

	cl_command_queue queue;
	starpu_opencl_get_current_queue(&queue);

	clEnqueueReadBuffer(queue, d_token, CL_TRUE, 0, sizeof(unsigned), (void *)&h_token, 0, NULL, NULL);
	h_token++;
	clEnqueueWriteBuffer(queue, d_token, CL_TRUE, 0, sizeof(unsigned), (void *)&h_token, 0, NULL, NULL); 
}
#endif


#ifdef STARPU_USE_CUDA
static void increment_cuda_kernel(void *descr[], void *arg)
{
	unsigned *tokenptr = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[0]);
	unsigned host_token;

	/* This is a dummy technique of course */
	cudaMemcpy(&host_token, tokenptr, sizeof(unsigned), cudaMemcpyDeviceToHost);
	cudaThreadSynchronize();

	host_token++;

	cudaMemcpy(tokenptr, &host_token, sizeof(unsigned), cudaMemcpyHostToDevice);
	cudaThreadSynchronize();
}
#endif

static void increment_cpu_kernel(void *descr[], void *arg)
{
	unsigned *tokenptr = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[0]);
	*tokenptr = *tokenptr + 1;
}

static starpu_codelet increment_cl = {
	.where = STARPU_CPU|STARPU_CUDA|STARPU_OPENCL,
#ifdef STARPU_USE_CUDA
	.cuda_func = increment_cuda_kernel,
#endif
#ifdef STARPU_USE_OPENCL
	.opencl_func = increment_opencl_kernel,
#endif
	.cpu_func = increment_cpu_kernel,
	.nbuffers = 1
};

int main(int argc, char **argv)
{
	starpu_init(NULL);

	unsigned nworkers = starpu_worker_get_count();

	starpu_variable_data_register(&handle, 0, (uintptr_t)&var, sizeof(unsigned));

	/* Create a mask with all the memory nodes, so that we can ask StarPU
	 * to broadcast the handle whenever it is modified. */
	uint32_t wt_mask = 0;

	int id;
	for (id = 0; id < nworkers; id++)
	{
		unsigned node = starpu_worker_get_memory_node(id);
		wt_mask |= (1<<node);
	}

	starpu_data_set_wt_mask(handle, wt_mask);

	unsigned ntasks = 1024;
	unsigned nloops = 16;

	unsigned loop;
	unsigned t;

	for (loop = 0; loop < nloops; loop++)
	{
		for (t = 0; t < ntasks; t++)
		{
			struct starpu_task *task = starpu_task_create();
	
			task->cl = &increment_cl;
	
			task->buffers[0].mode = STARPU_RW;
			task->buffers[0].handle = handle;
	
			int ret = starpu_task_submit(task);
			STARPU_ASSERT(!ret);

		}
	}

	starpu_data_unregister(handle);
	STARPU_ASSERT(var == ntasks*nloops);
	
	starpu_shutdown();

	return 0;
}