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/* StarPU --- Runtime system for heterogeneous multicore architectures.
*
* Copyright (C) 2011, 2012 Centre National de la Recherche Scientifique
*
* 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_mpi.h>
#include <math.h>
#include "helper.h"
void func_cpu(void *descr[], __attribute__ ((unused)) void *_args)
{
unsigned *x = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[0]);
unsigned *y = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[1]);
FPRINTF(stdout, "VALUES: %d %d\n", *x, *y);
*x = (*x + *y) / 2;
}
struct starpu_codelet mycodelet =
{
.where = STARPU_CPU,
.cpu_funcs = {func_cpu, NULL},
.nbuffers = 2,
.modes = {STARPU_RW, STARPU_R}
};
#define X 4
#define Y 5
/* Returns the MPI node number where data indexes index is */
int my_distrib(int x, int y, int nb_nodes)
{
return x % nb_nodes;
}
int main(int argc, char **argv)
{
int rank, size, x, y;
int ret,value=0;
unsigned matrix[X][Y];
starpu_data_handle_t data_handles[X][Y];
ret = starpu_init(NULL);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
ret = starpu_mpi_initialize_extended(&rank, &size);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_mpi_initialize_extended");
for(x = 0; x < X; x++)
{
for (y = 0; y < Y; y++)
{
matrix[x][y] = (rank+1)*10 + value;
value++;
}
}
#if 0
for(x = 0; x < X; x++)
{
FPRINTF(stdout, "[%d] ", rank);
for (y = 0; y < Y; y++)
{
FPRINTF(stdout, "%3d ", matrix[x][y]);
}
FPRINTF(stdout, "\n");
}
#endif
for(x = 0; x < X; x++)
{
for (y = 0; y < Y; y++)
{
int mpi_rank = my_distrib(x, y, size);
if (mpi_rank == rank)
{
//FPRINTF(stderr, "[%d] Owning data[%d][%d]\n", rank, x, y);
starpu_variable_data_register(&data_handles[x][y], 0, (uintptr_t)&(matrix[x][y]), sizeof(unsigned));
}
else if (rank == mpi_rank+1 || rank == mpi_rank-1)
{
/* I don't own that index, but will need it for my computations */
//FPRINTF(stderr, "[%d] Neighbour of data[%d][%d]\n", rank, x, y);
starpu_variable_data_register(&data_handles[x][y], -1, (uintptr_t)NULL, sizeof(unsigned));
}
else
{
/* I know it's useless to allocate anything for this */
data_handles[x][y] = NULL;
}
if (data_handles[x][y])
{
starpu_data_set_rank(data_handles[x][y], mpi_rank);
starpu_data_set_tag(data_handles[x][y], (y*X)+x);
}
}
}
ret = starpu_mpi_insert_task(MPI_COMM_WORLD, &mycodelet, STARPU_RW, data_handles[1][1], STARPU_R, data_handles[0][1], 0);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_mpi_insert_task");
ret = starpu_mpi_insert_task(MPI_COMM_WORLD, &mycodelet, STARPU_RW, data_handles[3][1], STARPU_R, data_handles[0][1], 0);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_mpi_insert_task");
ret = starpu_mpi_insert_task(MPI_COMM_WORLD, &mycodelet, STARPU_RW, data_handles[0][1], STARPU_R, data_handles[0][0], 0);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_mpi_insert_task");
ret = starpu_mpi_insert_task(MPI_COMM_WORLD, &mycodelet, STARPU_RW, data_handles[3][1], STARPU_R, data_handles[0][1], 0);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_mpi_insert_task");
FPRINTF(stderr, "Waiting ...\n");
starpu_task_wait_for_all();
for(x = 0; x < X; x++)
{
for (y = 0; y < Y; y++)
{
if (data_handles[x][y])
starpu_data_unregister(data_handles[x][y]);
}
}
starpu_mpi_shutdown();
starpu_shutdown();
#if 0
for(x = 0; x < X; x++)
{
FPRINTF(stdout, "[%d] ", rank);
for (y = 0; y < Y; y++)
{
FPRINTF(stdout, "%3d ", matrix[x][y]);
}
FPRINTF(stdout, "\n");
}
#endif
return 0;
}
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