Point-to-point communication directs information flow from one process to a designated receiving process. We first describe the methods and features by considering a ping-pong situation and a telephone-chain situation and explain the notion of blocking.
Point-to-point communication is applied in scientific computing, for instance in random-walk or particle-tracing applications on domains that are divided into a number of subdomains corresponding to the number of processes that can be carried out in parallel.
The ping-pong example assumes that we have two processors sending an integer back and forth to each other and increasing its value by one.
We start by creating a communicator object and checking that we have two processes available:
from mpi4py import MPI
comm=MPI.COMM_WORLD # making a communicator instance
rank=comm.Get_rank() # querying for the numeric identifier of the core
size=comm.Get_size() # the total number of cores assigned
if not (size...
