/* Split current communicator in half */
myColor = myid >= (size / 2);
newComm = comm.Split(myColor, 0);

/* Create intercommunicators over the gap */
peerid = myColor ? (myid - size / 2) : (myid + size / 2);
interComm = newComm.Create_intercomm(0, comm, peerid, 1);