[This is preliminary documentation and is subject to change.]

The "world" communicator contains all of the processes that were originally created by MPI.

Namespace:  MPI
Assembly:  MPI (in MPI.dll)
Version: (


public static Intracommunicator world
Visual Basic (Declaration)
Public Shared world As Intracommunicator
Visual C++
static Intracommunicator^ world


Use the "world" communicator to determine how many processes the user started for your MPI job, and as the basis for creating the other communicators in your program. Many simple programs will use only the "world" communicator.

See Also