For a collective operation, indicates that this process is the same group as the root but is not the root (and thus is not receiving any data). These processes should pass this is as the root for calls to collective communication procedures. Processes in the group sending to the root should use the root process' local rank. The root process should pass in Root.

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


public const int Null
Visual Basic (Declaration)
Public Const Null As Integer
Visual C++
literal int Null

See Also