The Great and Terrible implementation of MPI-2

function index


Return the version number of MPI
int MPI_Get_version(
  int *version,
  int *subversion


[out] Version of MPI
[out] Subversion of MPI


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 
in Fortran,

For runtime determination, MPI_GET_VERSION returns these two numbers.

MPI_GET_VERSION is one of the few functions that can be called before MPI_INIT and after MPI_FINALIZE.

Thread and Interrupt Safety

This routine is both thread- and interrupt-safe. This means that this routine may safely be used by multiple threads and from within a signal handler.

Notes for Fortran

All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement.

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.


All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.

No error; MPI routine completed successfully.

Example Code

The following sample code illustrates MPI_Get_version.


int main(int argc, char *argv[])
int version, sub_version;
    MPI_Init(&argc, &argv);
    MPI_Get_version(&version, &sub_version);
    printf("MPI Version %d.%d\n", version, sub_version);fflush(stdout);
return 0;