[petsc-users] MPI-IO

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:
>    Yes the correct PetscViewerFormat is limited in that there is only
>    one supported at a time. We could go the horrible bit oring of
>    options or we could collect multiple options instead of just one.

I think we should collect multiple options.

>> Uh, MPI_Pack_external and MPI_Unpack_external?
>
>    Ok, so maybe the finally implemented them. We don’t use this BTW
>    because Rajev told me (a long time ago) that MPICH doesn’t support
>    it.

Must have been prior to MPI-2.1.  Shall we test for MPI_Pack_external
and use MPI-IO by default if it's available?
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