[mpich-discuss] (no subject)

[Chafik sanaa]

when I execute the "A" program the result is displayed , but when i trying
to add a piece "B" of code aims to read a .txt file  nothing appear:

program A:
---------------------------------------
#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "math.h"
#include "mpi.h"

#define MAX_LIGNE 20   /* au maximum, 10 lignes */
#define MAX_COL    20   /* au maximum 8 colonnes */
#define NOM_A_LIRE "fichier1.txt" /*matrice a lire*/
typedef int Matrice[MAX_LIGNE][MAX_COL];
int main(int argc, char** argv)
{
int          taskid, ntasks;
int          ierr, i, itask;
int         sendcounts[2048], displs[2048], recvcount;
double       **sendbuff, *recvbuff, buffsum, buffsums[2048];
double       inittime, totaltime;
const int nbr_etat = 10;
double tab[nbr_etat];



for (int i = 0; i < nbr_etat; i++)
tab[i] = i;

for (int i = 0; i < nbr_etat; i++)
printf("%0.0f ", tab[i]);
printf("\n");
int nbr_elm[2] = { 4, 6 };
int dpl[2] = { 0, 4 };

MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &taskid);
MPI_Comm_size(MPI_COMM_WORLD, &ntasks);

recvbuff = (double *)malloc(sizeof(double)*nbr_etat);
if (taskid == 0)
{
sendbuff = (double **)malloc(sizeof(double *)*ntasks);// on execute pour
deux proc
sendbuff[0] = (double *)malloc(sizeof(double)*ntasks*nbr_etat);
for (i = 1; i < ntasks; i++)
{
sendbuff[i] = sendbuff[i - 1] + nbr_etat;
}
}
else
{
sendbuff = (double **)malloc(sizeof(double *)* 1);
sendbuff[0] = (double *)malloc(sizeof(double)* 1);
}

if (taskid == 0){

srand((unsigned)time(NULL) + taskid);
for (itask = 0; itask<ntasks; itask++)
{
int k;
displs[itask] = itask*nbr_etat;
int s = dpl[itask];
sendcounts[itask] = nbr_elm[itask];


for (i = 0; i<sendcounts[itask]; i++)
{
k = i + s;
sendbuff[itask][i] = tab[k];
printf("+ %0.0f  ", sendbuff[itask][i]);
}
printf("\n");
}
}

recvcount = nbr_elm[taskid];

inittime = MPI_Wtime();

ierr = MPI_Scatterv(sendbuff[0], sendcounts, displs, MPI_DOUBLE,
recvbuff, recvcount, MPI_DOUBLE,
0, MPI_COMM_WORLD);

totaltime = MPI_Wtime() - inittime;

printf("\n >>>> \n");
buffsum = 0.0;
printf("\n > %d < \n", taskid);
for (i = 0; i<recvcount; i++)
{
buffsum = buffsum + recvbuff[i];
printf("* %0.0f ", recvbuff[i]);
}
printf("\n");
printf("(%d) %0.3f ", taskid, buffsum);

ierr = MPI_Gather(&buffsum, 1, MPI_DOUBLE,
buffsums, 1, MPI_DOUBLE,
0, MPI_COMM_WORLD);
if (taskid == 0)
{
printf("\n");
printf("##########################################################\n\n");
printf("                --> APReS COMMUNICATION <-- \n\n");
for (itask = 0; itask<ntasks; itask++)
{
printf("Processus %d : Somme du vecteur reçu : %0.0f\n",
itask, buffsums[itask]);
}
printf("\n");
printf("##########################################################\n\n");
printf(" Temps total de communication : %f secondes\n\n", totaltime);
printf("##########################################################\n\n");
}

 /* Libération de la mémoire                                      */
if (taskid == 0)
{
free(sendbuff[0]);
free(sendbuff);
}
else
{
free(sendbuff[0]);
free(sendbuff);
free(recvbuff);
}

 /* Finalisation de MPI                                           */
MPI_Finalize();
}

program B:
-------------------------
#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "math.h"
#include "mpi.h"

#define MAX_LIGNE 20   /* au maximum, 10 lignes */
#define MAX_COL    20   /* au maximum 8 colonnes */
#define NOM_A_LIRE "fichier1.txt" /*matrice a lire*/
typedef int Matrice[MAX_LIGNE][MAX_COL];
int main(int argc, char** argv)
{
int          taskid, ntasks;
int          ierr, i, itask;
int         sendcounts[2048], displs[2048], recvcount;
double       **sendbuff, *recvbuff, buffsum, buffsums[2048];
double       inittime, totaltime;
const int nbr_etat = 10;
double tab[nbr_etat];



for (int i = 0; i < nbr_etat; i++)
tab[i] = i;

for (int i = 0; i < nbr_etat; i++)
printf("%0.0f ", tab[i]);
printf("\n");
int nbr_elm[2] = { 4, 6 };
int dpl[2] = { 0, 4 };

MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &taskid);
MPI_Comm_size(MPI_COMM_WORLD, &ntasks);

recvbuff = (double *)malloc(sizeof(double)*nbr_etat);
if (taskid == 0)
{
sendbuff = (double **)malloc(sizeof(double *)*ntasks);// on execute pour
deux proc
sendbuff[0] = (double *)malloc(sizeof(double)*ntasks*nbr_etat);
for (i = 1; i < ntasks; i++)
{
sendbuff[i] = sendbuff[i - 1] + nbr_etat;
}
}
else
{
sendbuff = (double **)malloc(sizeof(double *)* 1);
sendbuff[0] = (double *)malloc(sizeof(double)* 1);
}

if (taskid == 0){

srand((unsigned)time(NULL) + taskid);
for (itask = 0; itask<ntasks; itask++)
{
int k;
displs[itask] = itask*nbr_etat;
int s = dpl[itask];
sendcounts[itask] = nbr_elm[itask];


for (i = 0; i<sendcounts[itask]; i++)
{
k = i + s;
sendbuff[itask][i] = tab[k];
printf("+ %0.0f  ", sendbuff[itask][i]);
}
printf("\n");
}
}

recvcount = nbr_elm[taskid];

inittime = MPI_Wtime();

ierr = MPI_Scatterv(sendbuff[0], sendcounts, displs, MPI_DOUBLE,
recvbuff, recvcount, MPI_DOUBLE,
0, MPI_COMM_WORLD);

totaltime = MPI_Wtime() - inittime;

printf("\n >>>> \n");
buffsum = 0.0;
printf("\n > %d < \n", taskid);
for (i = 0; i<recvcount; i++)
{
buffsum = buffsum + recvbuff[i];
printf("* %0.0f ", recvbuff[i]);
}
printf("\n");
printf("(%d) %0.3f ", taskid, buffsum);

ierr = MPI_Gather(&buffsum, 1, MPI_DOUBLE,
buffsums, 1, MPI_DOUBLE,
0, MPI_COMM_WORLD);
if (taskid == 0)
{
printf("\n");
printf("##########################################################\n\n");
printf("                --> APReS COMMUNICATION <-- \n\n");
for (itask = 0; itask<ntasks; itask++)
{
printf("Processus %d : Somme du vecteur reçu : %0.0f\n",
itask, buffsums[itask]);
}
printf("\n");
printf("##########################################################\n\n");
printf(" Temps total de communication : %f secondes\n\n", totaltime);
printf("##########################################################\n\n");
}

/*===============================================================*/
/* Libération de la mémoire                                      */
if (taskid == 0)
{
free(sendbuff[0]);
free(sendbuff);
}
else
{
free(sendbuff[0]);
free(sendbuff);
free(recvbuff);
}

/*===============================================================*/
/* Finalisation de MPI                                           */
MPI_Finalize();
Matrice A;
int  m, n;
/* ouvrir le fichier Matrices.dta sur le disque réseau pour la lecture */
FILE * aLire = fopen(NOM_A_LIRE, "r");
if (aLire == NULL)
{
printf("Le fichier n'existe pas");
}
else
{
fscanf(aLire, "%d%d\n", &m, &n);
////void lire(FILE * aLire, Matrice mat, int nbLigne, int nbCol)
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++)
fscanf(aLire, "%d", &A[i][j]);
fscanf(aLire, "\n");
}
////void afficher(Matrice mat, char nom[], int nbLigne, int nbCol)

printf("\nContenu de la matrice de %d ligne(s) et %d colonne(s) :\n", m, n);
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++)
printf("%d ", A[i][j]);
printf("\n");
}
printf("\n");


}
fclose(aLire);

}
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