MPI_Graph_map(3) MPI MPI_Graph_map(3)NAMEMPI_Graph_map - Maps process to graph topology information
SYNOPSIS
int MPI_Graph_map(MPI_Comm comm_old, int nnodes, int *indx, int *edges,
int *newrank)
INPUT PARAMETERS
comm - input communicator (handle)
nnodes - number of graph nodes (integer)
indx - integer array specifying the graph structure, see
MPI_GRAPH_CREATE
edges - integer array specifying the graph structure
OUTPUT PARAMETER
newrank
- reordered rank of the calling process; MPI_UNDEFINED if the
calling process does not belong to graph (integer)
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.
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 com‐
municators), 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 prede‐
fined 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.
MPI_ERR_TOPOLOGY
- Invalid topology. Either there is no topology associated with
this communicator, or it is not the correct type (e.g., MPI_CART
when expecting MPI_GRAPH ).
MPI_ERR_COMM
- Invalid communicator. A common error is to use a null commu‐
nicator in a call (not even allowed in MPI_Comm_rank ).
MPI_ERR_ARG
- Invalid argument. Some argument is invalid and is not identi‐
fied by a specific error class (e.g., MPI_ERR_RANK ).
LOCATION
graph_map.c
3/24/2011 MPI_Graph_map(3)
