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MPI_Group_translate_ranks - Translates the ranks of processes in one
group to those in another group.
#include <mpi.h>
int MPI_Group_translate_ranks(MPI_Group group1, int n,
int *ranks1, MPI_Group group2, int *ranks2)
INCLUDE ’mpif.h’
MPI_GROUP_TRANSLATE_RANKS(GROUP1, N, RANKS1, GROUP2, RANKS2,
IERROR)
INTEGER GROUP1, N, RANKS1(*), GROUP2, RANKS2(*), IERROR
#include <mpi.h>
static void Group::Translate_ranks (const Group& group1, int n,
const int ranks1[], const Group& group2, int ranks2[])
- group1
- First group (handle).
- n
- Number of ranks in ranks1
and ranks2 arrays (integer).
- ranks1
- Array of zero or more valid ranks in
group1.
- group2
- Second group (handle).
- ranks2
- Array of corresponding
ranks in group2, MPI_UNDEFINED when no correspondence exists.
- IERROR
- Fortran
only: Error status (integer).
This function is important for
determining the relative numbering of the same processes in two different
groups. For instance, if one knows the ranks of certain processes in the
group of MPI_COMM_WORLD, one might want to know their ranks in a subset
of that group.
Almost all MPI routines return an error value; C routines
as the value of the function and Fortran routines in the last argument.
C++ functions do not return errors. If the default error handler is set
to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
will be used to throw an MPI:Exception object.
Before the error value is
returned, the current MPI error handler is called. By default, this error
handler aborts the MPI job, except for I/O function errors. The error handler
may be changed with MPI_Comm_set_errhandler; the predefined error handler
MPI_ERRORS_RETURN may be used to cause error values to be returned. Note
that MPI does not guarantee that an MPI program can continue past an error.
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