MPI_Group_translate_ranks

 Translates the ranks of processes in one group to those in another group

Synopsis

int MPI_Group_translate_ranks(MPI_Group group1, int n, const int ranks1[],
                            MPI_Group group2, int ranks2[])

Input Parameters

group1
group1 (handle)
n
number of ranks in ranks1 and ranks2 arrays (integer)
ranks1
array of zero or more valid ranks in group1
group2
group2 (handle)

Output Parameters

ranks2
array of corresponding ranks in group2, MPI_UNDEFINED when no correspondence exists.

As a special case (see the MPI-2 errata), if the input rank is MPI_PROC_NULL, MPI_PROC_NULL is given as the output rank.

Thread and Interrupt Safety

This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

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.

Errors

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.

MPI_SUCCESS
No error; MPI routine completed successfully.