[Mpi3-rma] MPI_NO_OP and origin buffer

[Jim Dinan]

MPI_Accumulate with MPI_REPLACE accomplishes a put.  NO_OP is not 
permitted in MPI_Accumulate.

On 9/7/12 5:23 PM, Torsten Hoefler wrote:
> All,
>
> So it may be fine for some accumulate ops but not for all because
> MPI_Accumulate with MPI_NO_OP was our back-door to get an atomic put.
> Thanks to Keith for pointing this out!
>
> Thanks,
>    Torsten
>
> On Fri, Sep 07, 2012 at 04:40:54PM -0500, Torsten Hoefler wrote:
>> Hi Jim,
>>
>> I agree, that is a reasonable change.
>>
>> Best,
>>    Torsten
>>
>> On Thu, Sep 06, 2012 at 10:48:47AM -0500, James Dinan wrote:
>>> Hi All,
>>>
>>> It looks like we forgot to specify that for MPI_NO_OP in the new
>>> accumulate ops, the origin buffer is ignored (i.e. it's acceptable to
>>> pass NULL).  We can add this text on page 441, line 30:
>>>
>>> When MPI_NO_OP is specified, the origin buffer is ignored.
>>>
>>> We already have such a use case in the linked list example.
>>>
>>>   ~Jim.
>>> _______________________________________________
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>>>
>>
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>> Torsten Hoefler           | Assistant Professor
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>