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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>
void stencil5_cpu(void *descr[], __attribute__ ((unused)) void *_args)
{
unsigned *xy = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[0]);
unsigned *xm1y = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[1]);
unsigned *xp1y = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[2]);
unsigned *xym1 = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[3]);
unsigned *xyp1 = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[4]);
// fprintf(stdout, "VALUES: %d %d %d %d %d\n", *xy, *xm1y, *xp1y, *xym1, *xyp1);
*xy = (*xy + *xm1y + *xp1y + *xym1 + *xyp1) / 5;
}
struct starpu_codelet stencil5_cl =
{
.where = STARPU_CPU,
.cpu_funcs = {stencil5_cpu, NULL},
.nbuffers = 5,
.modes = {STARPU_RW, STARPU_R, STARPU_R, STARPU_R, STARPU_R}
};
#define NITER_DEF 500
#define X 20
#define Y 20
int display = 0;
int niter = NITER_DEF;
/* Returns the MPI node number where data indexes index is */
int my_distrib(int x, int y, int nb_nodes)
{
/* Block distrib */
return ((int)(x / sqrt(nb_nodes) + (y / sqrt(nb_nodes)) * sqrt(nb_nodes))) % nb_nodes;
}
static void parse_args(int argc, char **argv)
{
int i;
for (i = 1; i < argc; i++)
{
if (strcmp(argv[i], "-iter") == 0)
{
char *argptr;
niter = strtol(argv[++i], &argptr, 10);
}
if (strcmp(argv[i], "-display") == 0)
{
display = 1;
}
}
}
int main(int argc, char **argv)
{
int my_rank, size, x, y, loop;
int value=0, mean=0;
unsigned matrix[X][Y];
starpu_data_handle_t data_handles[X][Y];
int ret = starpu_init(NULL);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
starpu_mpi_initialize_extended(&my_rank, &size);
parse_args(argc, argv);
for(x = 0; x < X; x++)
{
for (y = 0; y < Y; y++)
{
matrix[x][y] = (my_rank+1)*10 + value;
value++;
mean += matrix[x][y];
}
}
mean /= value;
for(x = 0; x < X; x++)
{
for (y = 0; y < Y; y++)
{
int mpi_rank = my_distrib(x, y, size);
if (mpi_rank == my_rank)
{
//fprintf(stderr, "[%d] Owning data[%d][%d]\n", my_rank, x, y);
starpu_variable_data_register(&data_handles[x][y], 0, (uintptr_t)&(matrix[x][y]), sizeof(unsigned));
}
else if (my_rank == my_distrib(x+1, y, size) || my_rank == my_distrib(x-1, y, size)
|| my_rank == my_distrib(x, y+1, size) || my_rank == my_distrib(x, y-1, size))
{
/* I don't own that index, but will need it for my computations */
//fprintf(stderr, "[%d] Neighbour of data[%d][%d]\n", my_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);
}
}
}
for(loop=0 ; loop<niter; loop++)
{
for (x = 1; x < X-1; x++)
{
for (y = 1; y < Y-1; y++)
{
starpu_mpi_insert_task(MPI_COMM_WORLD, &stencil5_cl, STARPU_RW, data_handles[x][y],
STARPU_R, data_handles[x-1][y], STARPU_R, data_handles[x+1][y],
STARPU_R, data_handles[x][y-1], STARPU_R, data_handles[x][y+1],
0);
}
}
}
fprintf(stderr, "Waiting ...\n");
starpu_task_wait_for_all();
starpu_mpi_shutdown();
starpu_shutdown();
if (display)
{
fprintf(stdout, "[%d] mean=%d\n", my_rank, mean);
for(x = 0; x < X; x++)
{
fprintf(stdout, "[%d] ", my_rank);
for (y = 0; y < Y; y++)
{
fprintf(stdout, "%3d ", matrix[x][y]);
}
fprintf(stdout, "\n");
}
}
return 0;
}
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