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 <robl@mcs.anl.gov> 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.

==rob
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