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MPI_Info_get_nkeys - Gets the number of keys currently defined
in an info object.
#include <mpi.h>
int MPI_Info_get_nkeys(MPI_Info info, int *nkeys)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_INFO_GET_NKEYS(INFO, NKEYS, IERROR)
INTEGER INFO, NKEYS, IERROR
USE mpi_f08
MPI_Info_get_nkeys(info, nkeys, ierror)
TYPE(MPI_Info), INTENT(IN) :: info
INTEGER, INTENT(OUT) :: nkeys
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- info
- Info object (handle).
- nkeys
- Number
of defined keys (integer).
- IERROR
- Fortran only: Error status (integer).
MPI_Info_get_nkeys returns the number of currently defined keys
in info.
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_Info_get
MPI_Info_get_nthkey
MPI_Info_get_valuelen
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