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MPI_Intercomm_merge - Creates an intracommunicator from an intercommunicator.
#include <mpi.h>
int MPI_Intercomm_merge(MPI_Comm intercomm, int high,
MPI_Comm *newintracomm)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_INTERCOMM_MERGE(INTERCOMM, HIGH, NEWINTRACOMM, IERROR)
INTEGER INTERCOMM, NEWINTRACOMM, IERROR
LOGICAL HIGH
USE mpi_f08
MPI_Intercomm_merge(intercomm, high, newintracomm, ierror)
TYPE(MPI_Comm), INTENT(IN) :: intercomm
LOGICAL, INTENT(IN) :: high
TYPE(MPI_Comm), INTENT(OUT) :: newintracomm
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- intercomm
- Intercommunicator (type indicator).
- high
- Used
to order the groups of the two intracommunicators within comm when creating
the new communicator (type indicator).
- newintracomm
- Created
intracommunicator (type indicator).
- IERROR
- Fortran only: Error status (integer).
This function creates an intracommunicator from the union of
the two groups that are associated with intercomm. All processes should
provide the same high value within each of the two groups. If processes
in one group provide the value high = false and processes in the other
group provide the value high = true, then the union orders the "low" group
before the "high" group. If all processes provide the same high argument,
then the order of the union is arbitrary. This call is blocking and collective
within the union of the two groups.
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.
MPI_Intercomm_create
MPI_Comm_free
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