NAME¶
MPI_Graph_map - Maps process to graph topology information.
C Syntax¶
#include <mpi.h>
int MPI_Graph_map(MPI_Comm comm, int nnodes, const int index[],
const int edges[], int *newrank)
Fortran Syntax¶
INCLUDE 'mpif.h'
MPI_GRAPH_MAP(COMM, NNODES, INDEX, EDGES, NEWRANK, IERROR)
INTEGER COMM, NNODES, INDEX(*), EDGES(*), NEWRANK, IERROR
C++ Syntax¶
#include <mpi.h>
int Graphcomm::Map(int nnodes, const int index[],
const int edges[]) const
- comm
- Input communicator (handle).
- nnodes
- Number of graph nodes (integer).
- index
- Integer array specifying the graph structure, see MPI_Graph_ create.
- edges
- Integer array specifying the graph structure.
OUTPUT PARAMETERS¶
- newrank
- Reordered rank of the calling process; MPI_UNDEFINED if the calling
process does not belong to graph (integer).
- IERROR
- Fortran only: Error status (integer).
DESCRIPTION¶
MPI_Cart_map and MPI_Graph_map can be used to implement all other topology
functions. In general they will not be called by the user directly, unless he
or she is creating additional virtual topology capability other than that
provided by MPI.
ERRORS¶
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.