forked from rbonvall/fox
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fox.c
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fox.c
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <mpi.h>
#include "matrix.h"
enum {FALSE = 0, TRUE = 1};
struct grid_info {
int nr_world_processes;
MPI_Comm comm;
MPI_Comm row_comm;
MPI_Comm col_comm;
int ppside;
int my_row, my_col, my_rank, my_world_rank;
};
void grid_setup(struct grid_info *grid);
void grid_info_print(struct grid_info *grid);
void Fox(struct grid_info *grid, int n,
matrix_type** local_A, matrix_type** local_B, matrix_type** local_C);
int intsqrt(int x);
int main(int argc, char *argv[]) {
struct grid_info grid;
MPI_Init(&argc, &argv);
grid_setup(&grid);
grid_info_print(&grid);
/* lado de una submatriz */
int n = 4;
int local_n = n / grid.ppside;
char A_filename[50], B_filename[50];
sprintf(A_filename, "data_localn2_side2/A_localn2_row%d_col%d", grid.my_row, grid.my_col);
sprintf(B_filename, "data_localn2_side2/B_localn2_row%d_col%d", grid.my_row, grid.my_col);
matrix_type **local_A, **local_B, **local_C;
local_A = matrix_new_from_file(local_n, local_n, A_filename);
local_B = matrix_new_from_file(local_n, local_n, B_filename);
local_C = matrix_new(local_n, local_n);
Fox(&grid, local_n, local_A, local_B, local_C);
printf("A%d%d =\n", grid.my_row, grid.my_col);
matrix_print(stdout, local_A, local_n, local_n);
printf("B%d%d =\n", grid.my_row, grid.my_col);
matrix_print(stdout, local_B, local_n, local_n);
printf("C%d%d =\n", grid.my_row, grid.my_col);
matrix_print(stdout, local_C, local_n, local_n);
MPI_Finalize();
return 0;
}
/* algoritmo de Fox para multiplicar matrices cuadradas de n x n */
void Fox(struct grid_info *grid, int local_n,
matrix_type** local_A, matrix_type** local_B, matrix_type** local_C)
{
int stage;
int i, j;
const int local_n_sq = local_n * local_n;
const int src = (grid->my_row + 1) % grid->ppside;
const int dest = (grid->my_row + grid->ppside - 1) % grid->ppside;
int bcast_root;
MPI_Status status;
matrix_type **temp_A = matrix_new(local_n, local_n);
for (stage = 0; stage < grid->ppside; ++stage) {
bcast_root = (grid->my_row + stage) % grid->ppside;
if (bcast_root == grid->my_col) {
MPI_Bcast(*local_A, local_n * local_n, MPI_FLOAT, bcast_root, grid->row_comm);
matrix_multiply_and_add(local_A, local_B, local_C, local_n, local_n, local_n);
}
else {
MPI_Bcast(*temp_A, local_n_sq, MPI_FLOAT, bcast_root, grid->row_comm);
matrix_multiply_and_add(temp_A, local_B, local_C, local_n, local_n, local_n);
}
MPI_Sendrecv_replace(*local_B, local_n_sq, MPI_FLOAT, dest, 0, src, 0, grid->col_comm, &status);
}
}
void grid_setup(struct grid_info *grid) {
/* obtener datos globales */
MPI_Comm_size(MPI_COMM_WORLD, &(grid->nr_world_processes));
MPI_Comm_rank(MPI_COMM_WORLD, &(grid->my_world_rank));
/* calcular cuantos procesos por lado tendra la grilla */
grid->ppside = intsqrt(grid->nr_world_processes);
/* crear comunicador para topologia de grilla */
int dimensions[2] = {grid->ppside, grid->ppside};
int wrap_around[2] = {TRUE, TRUE};
int reorder = TRUE;
MPI_Cart_create(MPI_COMM_WORLD, 2, dimensions, wrap_around, reorder, &(grid->comm));
MPI_Comm_rank(grid->comm, &(grid->my_rank));
/* obtener coordenadas grillisticas del proceso */
int coordinates[2];
MPI_Cart_coords(grid->comm, grid->my_rank, 2, coordinates);
grid->my_row = coordinates[0];
grid->my_col = coordinates[1];
/* obtener comunicadores para la fila y la columna del proceso */
int free_coords_for_rows[] = {FALSE, TRUE};
int free_coords_for_cols[] = {TRUE, FALSE};
MPI_Cart_sub(grid->comm, free_coords_for_rows, &(grid->row_comm));
MPI_Cart_sub(grid->comm, free_coords_for_cols, &(grid->col_comm));
}
void grid_info_print(struct grid_info *grid) {
printf("nr_world_processes: %d\n", grid->nr_world_processes);
printf("ppside: %d\n", grid->ppside);
}
int intsqrt(int x) {
/* TODO: implementacion mas eficiente */
return (int) sqrt((double) x);
}