3.1. Version Number

In order to cope with changes to the MPI Standard, there are both compile-time and run-time ways to determine which version of the standard is in use in the environment one is using.

The ``version'' will be represented by two separate integers, for the version and subversion:

In C and C++,

#define MPI_VERSION    1 
    #define MPI_SUBVERSION 2 

INTEGER MPI_VERSION, MPI_SUBVERSION 
    PARAMETER (MPI_VERSION    = 1) 
    PARAMETER (MPI_SUBVERSION = 2) 

For runtime determination,

MPI_GET_VERSION( version, subversion )
[ OUT version] version number (integer)
[ OUT subversion] subversion number (integer)

int MPI_Get_version(int *version, int *subversion)

MPI_GET_VERSION(VERSION, SUBVERSION, IERROR)
INTEGER VERSION, SUBVERSION, IERROR

MPI_GET_VERSION is one of the few functions that can be called before MPI_INIT and after MPI_FINALIZE. Its C++ binding can be found in the Annex, Section C++ Bindings for New 1.2 Functions .