[Mpi3-rma] MPI_Win_allocate_shared and synchronization functions

[Torsten Hoefler]

Hubert,

This is what I was referring to. I'm in favor of this proposal.

Torsten

On Tue, Sep 11, 2012 at 05:26:23PM +0000, Hubert Ritzdorf wrote:
>    Hi,
> 
>    it's quite unclear what Page 410, Lines 17-19
> 
>    A consistent view can be created in the uni?fied
>    memory model (see Section 11.4) by utilizing the window synchronization
>    functions (see
>    Section 11.5)
> 
>    really means. Section 11.5 doesn't mention any (load/store) access to
>    shared memory.
>    Thus, must
> 
>    (*) RMA communication calls and RMA operations
>         be interpreted   as RMA communication calls (MPI_GET, MPI_PUT, ...)
>    and
>                                    ANY load/store access to shared window
>    (*) put call             as put call and any store to shared memory
>    (*) get call             as get call and any load from shared memory
>    (*) accumulate call as accumulate call and any load or store access to
>    shared window ?
> 
>    Example: Assertion MPI_MODE_NOPRECEDE
> 
>    Does
> 
>    the fence does not complete any sequence of locally issued RMA calls
> 
>    mean for windows created by MPI_Win_Allocate_shared ()
> 
>    the fence does not complete any sequence of locally issued RMA calls or
>    any load/store access to the window memory ?
> 
>    It's not clear to me. I will be probably not clear for the standard MPI
>    user.
>    RMA operations are defined only MPI functions for window objects
>    (as far as I can see).
>    But possibly I'm totally wrong and the synchronization functions
>    synchronize
>    only the RMA communication calls (MPI_GET, MPI_PUT, ...).
> 
>    Hubert

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