Topologies and data shifts

Topologies and Data Shifts

• Consider the following two types of shift for group of size N:
  • Circular shift by J. Data in process K is sent to process
    
    
  • End-off shift by J. Data in process K is sent to process J+K if this is between 0 and N-1. Otherwise, no data are sent.
• Topological shifts are performed using mpi_sendrecv.
• mpi_cart_shift returns the ranks of the processes that a process must send to and receive from when performing a shift on a topological group.