MPI_Intercomm_create

create an intercommunicator

Synopsis

int MPI_Intercomm_create(MPI_Comm local_comm, int local_leader, 
                       MPI_Comm peer_comm, int remote_leader, int tag, 
                       MPI_Comm *newintercomm)

Arguments

MPI_Comm local_comm
local communicator
int local_leader
local leader
MPI_Comm peer_comm
peer communicator
int remote_leader
remote leader
int tag
tag
MPI_Comm *newintercomm
new intercommunicator

Notes

peer_comm is significant only for the process designated the local_leader in the local_comm.

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_Errhandler_set; 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.

MPI_SUCCESS
No error; MPI routine completed successfully.

Location:intercomm_create.c