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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.
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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