[petsc-users] MPI-IO

[Barry Smith]

On Jul 21, 2014, at 11:50 AM, Jed Brown <jed at jedbrown.org> wrote:

> 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?

  I don’t care