Port Name

• Establishing contact via a "port"
  port name system dependent, e.g. "IP-name:port-number"
• Server publishes its port name (f.i. writes it to a file)
  client gets the port name explicitly (f.i. as command line parameter)
• Examples:
  • server writes port name to the terminal
    user reads port name and starts client with port name as parameter
    "third party" = user
  • server writes port name to file
    client reads port name from file
    "third party" = file system/file
• corresponding MPI routines:
  MPI_Open_port

  • gets a valid port from the system
  MPI_Close_port

  • releases port name
  MPI_Comm_accept

  • server waits for clients under port name,
  • returns intercommunicator
  MPI_Comm_connect

  • client establishes contact with server using port name
  • returns intercommunicator
  MPI_Comm_disconnect

  • client and server disconnect
  • they are independent afterwards