Are you asking about MPICH_MPIIO_HINTS_DISPLAY? That should display the hints at file open.

man intro_mpi

MPICH_MPIIO_HINTS_DISPLAY If set, causes rank 0 in the participating communicator to display the names and values of all MPI-IO hints that are set for the file being opened with the MPI_File_open call. Default: not enabled. The MPICH_MPIIO_HINTS is used to set hints.

MPICH_MPIIO_HINTS_DISPLAY=1 MPICH_MPIIO_HINTS=*:romio_no_indep_rw=true ....run a program

PE 0: MPIIO hints for testdir/file: ... cb_nodes = 1 romio_no_indep_rw = true cb_config_list = *:* romio_filesystem_type = CRAY ADIO: On Thu, May 5, 2016 at 8:35 PM, Rob Latham <[email protected]> wrote:

On 05/05/2016 07:27 PM, Jaln wrote:

...

Hi, I'm using the environmental variable MPICH_MPIIO_HINTS, to dump the mpiio configuration, but apparently, many layers(HDF5, Filesystems, etc) can overwrite the hints that passed in by the user. I think MPICH_MPIIO_HINTS can only grab the static information, not the runtime info. I'm wondering if there is anyway to accurately print out the MPIIO information without hacking the source codes? Thanks,

First off, I don't have any idea what Cray is doing with their MPI implementation. They don't share their code with us, so you'd better contact them for support.

I'm going to guess that MPICH_MPIIO_HINTS is really doing what you want -- if it's not, that's a bug and you should contact cray about that.

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