Seyed,
you probably want to use MPI_Bcast instead of your code (see
http://mpitutorial.com/tutorials/mpi-broadcast-and-collective-communication/)
Best,
Bruno
On Wednesday, March 8, 2017 at 9:51:50 AM UTC-5, Seyed Ali Mohseni wrote:
>
> Dear all,
>
> I was able to solve the MPI variable problem.
>
> For the users who may have the same issue once:
>
> if ( this_mpi_process == max_rank )
> {
> for (unsigned int i = 0; i < n_mpi_processes; ++i)
> {
> if ( i != max_rank )
> MPI_Send(&position, 1, MPI_DOUBLE, i, 0, mpi_com);
> }
> }
> else
> {
> MPI_Recv(&position, 1, MPI_DOUBLE, max_rank, 0, mpi_com,
> MPI_STATUS_IGNORE);
> printf("Process %d received number from process %d\n",
> this_mpi_process, max_rank);
> }
>
> A double variable called position (just as an example here, you have to
> pass x,y,z, so 3 variables) can be defined earlier which has then to be
> filled on the rank equal to max_rank.
>
> Finally, I can proceed. The code was tested for ranks 1 to 16 and works
> perfectly. Every time the maximum value and position remains correct and
> unchanged, but the maximum rank (max_rank) changes dependent on the core
> numbers.
>
> Thank you a lot.
> The community here is extraordinary. ;)
>
> Best regards,
> S. A. Mohseni
>
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