[Mpi3-rma] Ticket for WG discussion

[Hubert Ritzdorf]

Hi Jim,

Sorry, I have some problems with the interpretation of function MPI_Aint_index().

(*) What does MPI_Aint_index() return ? 
      A target displacement which can be used in RMA functions such as MPI Put/Get or
      does it return an address such as MPI_Get_address () ?

(*) What is argument "base" ?
       An address returned by MPI_Get_address() of any address or 
       a window base returned by 
       MPI_Win_get_attr(win, MPI_WIN_BASE, &base, &flag) ?
       May "base" (as MPI_Aint) be transferred from a different process ?

Hubert
________________________________________
From: mpi3-rma-bounces at lists.mpi-forum.org [mpi3-rma-bounces at lists.mpi-forum.org] on behalf of Jim Dinan [dinan at mcs.anl.gov]
Sent: Tuesday, March 12, 2013 9:08 PM
To: mpi3-rma at lists.mpi-forum.org
Subject: Re: [Mpi3-rma] Ticket for WG discussion

Hubert,

We have added a solution #3 to the ticket based on discussion in the
working group today.  That's our current proposal.  Could you take a
look and see if that will be Fortran compatible?

Thanks,
  ~Jim.

On 3/12/13 2:28 PM, Hubert Ritzdorf wrote:
> Hi,
>
> concerning Ticket 349.
> (*) In Fortran, the displacement for dynamic windows may be signed
>        since MPI_BOTTOM of Fortran is not (void *) NULL..
> (*) Fortran doesn't have unsigned integers, thus you cannot use
>        a Fortran version of MPI_Disp for arithmetics (such as disp++).
> (*) MPI Displacements in general may be signed.
>        They might be relative to any address.
>
>
> Therefore, I can't see that the Proposed Solution 2 solves the problem.
>
> Hubert
>
> ________________________________________
> From: mpi3-rma-bounces at lists.mpi-forum.org [mpi3-rma-bounces at lists.mpi-forum.org] on behalf of Jim Dinan [dinan at mcs.anl.gov]
> Sent: Tuesday, March 12, 2013 5:12 PM
> To: MPI 3.0 Remote Memory Access working group
> Subject: [Mpi3-rma] Ticket for WG discussion
>
> Hi All,
>
> I would like to propose the following two tickets for discussion in
> today's WG meeting:
>
> https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/349
> https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/344
>
> #349 is a bugfix that definitely needs to be addressed.  #344 is an
> "elegance of the interface" ticket where I would like to poll the WG to
> determine the level of support and determine if this should be pursued.
>
> I unfortunately need to duck out at 4pm today, so if possible, I propose
> that we discuss these at the beginning of the meeting.
>
> Thanks!
>    ~Jim.
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