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MPI_Comm_dup_with_info - Duplicates an existing communicator
using provided info.
#include <mpi.h>
int MPI_Comm_dup_with_info(MPI_Comm comm, MPI_Info info, MPI_Comm *newcomm)
INCLUDE ’mpif.h’
MPI_COMM_DUP_WITH_INFO(COMM, INFO, NEWCOMM, IERROR)
INTEGER COMM, INFO, NEWCOMM, IERROR
- comm
- Communicator (handle).
- info
- Info argument (handle).
- newcomm
- Copy of comm (handle).
- IERROR
- Fortran only: Error
status (integer).
MPI_Comm_dup_with_info acts exactly like MPI_Comm_dup
except that the info hints associated with the communicator comm are not
duplicated in newcomm. The hints provided by the argument info are associated
with the output communicator newcomm instead.
This operation is used
to provide a parallel library call with a duplicate communication space
that has the same properties as the original communicator. This includes
any attributes (see below) and topologies (see Chapter 6, "Process Topologies,"
in the MPI-1 Standard). This call is valid even if there are pending point-to-point
communications involving the communicator comm. A typical call might involve
an MPI_Comm_dup_with_info at the beginning of the parallel call, and an
MPI_Comm_free of that duplicated communicator at the end of the call. Other
models of communicator management are also possible.
This call applies to
both intra- and intercommunicators.
Note that it is not defined by the MPI
standard what happens if the attribute copy callback invokes other MPI
functions. In Open MPI, it is not valid for attribute copy callbacks (or
any of their children) to add or delete attributes on the same object on
which the attribute copy callback is being invoked.
Almost all MPI
routines return an error value; C routines as the value of the function
and Fortran routines in the last argument.
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_Comm_dup
MPI_Comm_idup
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