Hi, Two processes run the following program:
request = MPI_Irecv MPI_Send (to the other process) MPI_Barrier flag = MPI_Test(request)Without the barrier, there's a race and MPI_Test may or may not return true, indicating whether the message has been received. With the barrier, is it guaranteed that the message will have been received, and MPI_Test will return true?
Cheers, Shaun
