Super EDIT:
Adding the broadcast step, will result in ncols to get printed by the two processes by the master node (from which I can check the output). But why? I mean, all variables that are broadcast have already a value in the line of their declaration!!! (off-topic image).
I have some code based on this example.
I checked that cluster configuration is OK, with this simple program, which also printed the IP of the machine that it would run onto:
int main (int argc, char *argv[])
{
int rank, size;
MPI_Init (&argc, &argv); /* starts MPI */
MPI_Comm_rank (MPI_COMM_WORLD, &rank); /* get current process id */
MPI_Comm_size (MPI_COMM_WORLD, &size); /* get number of processes */
printf( "Hello world from process %d of %d\n", rank, size );
// removed code that printed IP address
MPI_Finalize();
return 0;
}
which printed every machine's IP twice.
EDIT_2
If I print (only) the grid, like in the example, I am getting for one computer:
Processes grid pattern:
0 1
2 3
and for two:
Processes grid pattern:
