starpu-max/tests/datawizard/commute2.c

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2014 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 <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#ifdef STARPU_USE_CUDA
#include <starpu_cuda.h>
#endif

static unsigned cnt;

static void cpu_memcpy(void *descr[], void *cl_arg)
{
	double *res = (double *)STARPU_VECTOR_GET_PTR(descr[0]);
	double *dst = (double *)STARPU_VECTOR_GET_PTR(descr[1]);
	int n = (int) STARPU_VECTOR_GET_NX(descr[0]);
	int me = (uintptr_t)cl_arg;

	if (me == 0)
	{
		sleep(1);
		STARPU_ASSERT(STARPU_ATOMIC_ADD(&cnt,1) == 1);
	}
	else
		STARPU_ASSERT(STARPU_ATOMIC_ADD(&cnt,1) != 1);

	memcpy(dst, res, n*sizeof(double));
}


static struct starpu_codelet my_cl = {
	.where =  STARPU_CPU,
	.cpu_funcs = {cpu_memcpy, NULL}, 
	.nbuffers = STARPU_VARIABLE_NBUFFERS
};

int 
main()
{
	double *res, *a;
	unsigned n=100000, i;
	starpu_data_handle_t res_handle, a_handle;
	unsigned nb_tasks = 10, worker;

	if (starpu_init(NULL)) 
		exit(-1);

	starpu_malloc((void**)&res, n*sizeof(double));
	starpu_malloc((void**)&a,   n*sizeof(double));

	for(i=0; i < n; i++)
		res[i] = a[i] = 1.0;
		
	starpu_vector_data_register(&res_handle, 0, (uintptr_t)res, (uint32_t)n, sizeof(double));
	starpu_vector_data_register(&a_handle,   0, (uintptr_t)a,   (uint32_t)n, sizeof(double));

	for (i = 0; i < nb_tasks; i++) {
		struct starpu_task *task = starpu_task_create();
		task->cl=&my_cl;
		task->nbuffers = 2;
		task->handles[0] = res_handle;

		if (i == 0)
			task->modes[0]   = STARPU_RW;
		else
			task->modes[0]   = STARPU_RW | STARPU_COMMUTE;
		
		task->handles[1] = a_handle;
		task->modes[1]   = STARPU_R;
		task->cl_arg = (void*)(uintptr_t)i;
		
		if (starpu_task_submit(task)) {
			fprintf(stderr,"taks submmition failed!");
			exit(EXIT_FAILURE);
		}
	}

	starpu_task_wait_for_all ();

	starpu_data_unregister(res_handle);
	starpu_data_unregister(a_handle);

	starpu_free(res);
	starpu_free(a);

	starpu_shutdown();
	return EXIT_SUCCESS;
}