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