A little clearer: The value returned is the address, relative to MPI_BOTTOM, resulting from the sum of base and disp. ~Jim. On 3/14/13 9:42 AM, Jim Dinan wrote:

Hi Hubert,

My apologies, the ticket is light on details. The proposed function is:

MPI_Aint MPI_Aint_index(MPI_Aint base, MPI_Aint disp);

This function interprets the base argument as an address relative to MPI_BOTTOM and the disp argument as a signed integer displacement. The value returned is the sum of these two values.

~Jim.

On 3/13/13 7:12 AM, Hubert Ritzdorf wrote:

...

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: [email protected] [[email protected]] on behalf of Jim Dinan [[email protected]] Sent: Tuesday, March 12, 2013 9:08 PM To: [email protected] 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: [email protected] [[email protected]] on behalf of Jim Dinan [[email protected]] 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. _______________________________________________ mpi3-rma mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma

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