dsada

#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char** argv) {
// Initialize the MPI environment
 MPI_Init(NULL, NULL);
// Find out rank, size
int world_rank;
MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
int world_size;
int size = 1000000;
float tab[1000000];
int p;
for(p=0; p<size; p++)
   tab[p] = 1;
MPI_Comm_size(MPI_COMM_WORLD, &world_size);
double t1,t2;
int i;
for (i = 0; i<20; i++){
t1 = MPI_Wtime();
MPI_Bcast(tab, size, MPI_FLOAT, 0, MPI_COMM_WORLD);
//MPI_Scatter( tab, size/4, MPI_FLOAT,tab,size/4,MPI_FLOAT,0,MPI_COMM_WORLD);

MPI_Barrier(MPI_COMM_WORLD);
t2 = MPI_Wtime();
if(world_rank == 0){
printf("%lf\n",t2-t1);
}

}
MPI_Finalize();
}