Set hints for the I/O system.

Set hints (e.g. filesystem hints, MPI hints) for the I/O system. This is a collective call on the I/O system

Parameters

[in]	iosys	The handle to the I/O system. IO system descriptor structure. This structure contains the general IO subsystem data and MPI structure
[in]	hint	The name of the hint
[in]	hval	The value of the hint
[out]	ierr	(Optional) : The error return code. Set to PIO_NOERR on success, or an error code otherwise (See PIO_seterrorhandling for more information on how to customize/set error handling)