[MPIWG Fortran] Questions on the F08 subarray format

[Rolf Rabenseifner]

I expect (after midnight) that clarifications are needed.
On 1. MPI_WIN_CREATE: the goal should be contigues window,
i.e., no strided subarrays.

Rolf

----- Original Message -----
> From: "Pavan Balaji" <balaji at anl.gov>
> To: mpiwg-fortran at lists.mpi-forum.org
> Sent: Saturday, March 1, 2014 11:29:59 PM
> Subject: [MPIWG Fortran] Questions on the F08 subarray format
> 
> Folks,
> 
> I had a few questions on the MPI-3 F08 bindings, which I couldn’t
> find answers to in the standard.  Can someone point me to the place
> where these are defined?
> 
> 1. How does the subarray format work for functions that have a void*
> argument, but no datatype to describe them (e.g., MPI_WIN_CREATE)?
>  In this case, What C function will MPI_WIN_CREATE_F08TS call?  Do
> we need to create an separate internal MPIR_WIN_CREATE_NEW function
> in our implementation that takes a datatype argument?  Does this
> mean that now MPI_WIN_CREATE can allow for noncontiguous buffers on
> each process?
> 
> 2. How does the subarray format work for functions that have a
> datatype argument, but no void* corresponding to that datatype?  For
> example, the target buffer in MPI_PUT is described using an MPI_AINT
> (offset), rather than a void*.
> 
> 3. How does the subarray format work for functions that have two
> void* arguments corresponding to the same datatype (e.g.,
> MPI_REDUCE)?
> 
> Thanks,
> 
>   — Pavan
> 
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-- 
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at hlrs.de
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307)