MPI_Barrier

Blocks until all processes in the communicator have reached this routine.

📝Syntax

r = MPI_Barrier(Comm)

📥Input Arguments

Parameter	Description
Comm	a MPI_Comm object.

📤Output Arguments

Parameter	Description
r	integer value: MPI_SUCCESS (0) or MPI_ERR_COMM (5).

📄Description

This function is used as a synchronization point for all processes in a group. All processes are blocked until every process calls MPI_Barrier.

💡Examples

mpiexec([modulepath('mpi'), '/examples/help_examples/MPI_Barrier.m'], 4)

if ~MPI_Initialized()
  MPI_Init();
end
my_rank = MPI_Comm_rank ();
num_ranks = MPI_Comm_size();
comm = MPI_Comm_object('MPI_COMM_WORLD');
sleep(my_rank);
MPI_Barrier(comm);
disp(['I am ', int2str(my_rank), ' of ', int2str(num_ranks)]);
if MPI_Initialized()
  MPI_Finalize();
end

🔗See Also

MPI_Initialized

🕔Version History

Version	Description
1.0.0	initial version

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