Predefined attribute key that can be used to determine the rank of the process than can perform I/O via the language-standard I/O mechanism. If every process can provided language-standard I/O, the resulting value will be MPI_ANY_SOURCE; if no process can support language-standard I/O, the result will be MPI_PROC_NULL. See IORank.

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


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

See Also