[Mpi3-rma] Conflicting PUT/GET accesses clarification

[James Dinan]

I think that this is not forbidden by ARMCI, but the result of such an 
operation is undefined.  The only situation in which GA would generate a 
call to ARMCI like this is when the programmer has messed something up. 
  And I think that the only place where the programmer would have this 
opportunity to mess up is with the leading dimensions on the local buffer.

  ~Jim.

On 04/28/2011 03:00 PM, Jeff Hammond wrote:
> I think that Pavan's question was motivated by the fact that ARMCI
> seems to allow this.  However, just because ARMCI does this does not
> make it right.  If a user reported this as a problem with an
> MPI-compliant ARMCI implementation, I would tell him or her to write a
> better application.  NWChem definitely does not need this.
>
> I suspect that the only reason ARMCI allows this is because they
> didn't have a reason to prohibit it, but it requires a séance to know
> for sure :-(
>
> Jeff
>
> On Thu, Apr 28, 2011 at 1:08 PM, William Gropp<wgropp at illinois.edu>  wrote:
>> I agree - I don't think this is an issue for users, including middleware, of
>> the RMA, and I would not want it to be different than the send/recv case.
>>
>> Bill
>>
>> On Apr 28, 2011, at 7:57 AM, Torsten Hoefler wrote:
>>
>>> On Thu, Apr 28, 2011 at 12:36:39AM -0500, Pavan Balaji wrote:
>>>>
>>>> Do these need to be relaxed in MPI-3 as well to make them undefined for
>>>> Put/Get? It might be OK to make it undefined in Accumulate as well.
>>>
>>> I don't think so because it's also erroneous for send/recv.
>>>
>>> All the Best,
>>>   Torsten
>>>
>>> --
>>> bash$ :(){ :|:&};: --------------------- http://www.unixer.de/ -----
>>> Torsten Hoefler         | Performance Modeling and Simulation Lead
>>> Blue Waters Directorate | University of Illinois (UIUC)
>>> 1205 W Clark Street     | Urbana, IL, 61801
>>> NCSA Building           | +01 (217) 244-7736
>>> _______________________________________________
>>> mpi3-rma mailing list
>>> mpi3-rma at lists.mpi-forum.org
>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma
>>
>> William Gropp
>> Director, Parallel Computing Institute
>> Deputy Director for Research
>> Institute for Advanced Computing Applications and Technologies
>> Paul and Cynthia Saylor Professor of Computer Science
>> University of Illinois Urbana-Champaign
>>
>>
>>
>> _______________________________________________
>> mpi3-rma mailing list
>> mpi3-rma at lists.mpi-forum.org
>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma
>>
>
>
>