[Mpi3-rma] Disp_unit in allocate_shared should be returned by win_shared_query?

Torsten Hoefler htor at illinois.edu
Wed Jul 18 13:06:22 CDT 2012

On Wed, Jul 18, 2012 at 01:08:43PM -0500, Pavan Balaji wrote:
> On 07/18/2012 01:02 PM, Torsten Hoefler wrote:
>> Jim,
>>> Is one process' disp_unit meaningful at another process?  I thought that
>>> this is not the case.  MPI provides no other routines to query another
>>> process' disp_unit.
>> It is something that the user is passing in. I don't know of a
>> particular use-case but we can query all other arguments that each
>> process passed. One more integer seemed safe to me.
>>> Also, what meaning does a disp_unit have in the context of load/store
>>> operations that will result from win_shared_query?
>> Nothing.
>>> Maybe I'm missing something, but this doesn't seem necessary.
>> Well, it's better to have it than to introduce it with a different name
>> later. That was my main motivation. One could also use it in a library
>> context to query. But that's weak, I know.
> This doesn't seem critical, and can always be added in MPI-3.1 if we  
> find it necessary.  No reason to rush it.
It cannot be added without a new function name. That was the concern
here. Adding it seems less risk than not adding it. In addition, it is
already added ;-).


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Torsten Hoefler         | Performance Modeling and Simulation Lead
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