[Mpi3-rma] MPI_Fetch_and_op and predefined datatypes

[Jeff Hammond]

I don't want to wait for 3.1.  Are we seriously going to require
MPI_WCHAR support in F&Op to be MPI-3 compliant?  That makes no sense.

Jeff

On Fri, Oct 26, 2012 at 3:47 PM, Torsten Hoefler <htor at illinois.edu> wrote:
> Agreed. This wording change makes things more clear and correct. I would
> not suggest this as an errata item, rather directly fix it in 3.1. We
> should make a decision on this at the next meeting!
>
> Thanks Hubert!
>
> Torsten
>
> On Fri, Oct 26, 2012 at 02:39:20PM +0000, Hubert Ritzdorf wrote:
>>    Hi,
>>
>>    Page 429, Line 41-42 specifies for MPI_Fetch_and_op:
>>
>>    The datatype argument must be a predefi?ned datatype.
>>
>>    I think it should be:
>>
>>    The datatype argument must be a MPI basic datatype (cf. Section 5.9.2 on
>>    page 176).
>>
>>    Reasons:
>>
>>    (*) This would be consistent to the reduce functions and
>>    MPI_Compare_and_swap
>>         and would allow handles returned by MPI_TYPE_CREATE_F90_INTEGER,
>>         MPI_TYPE_CREATE_F90_REAL, or MPI_TYPE_F90_COMPLEX.
>>
>>    (*) MPI_Compare_and_swap accepts handles created by
>>         MPI_TYPE_CREATE_F90_INTEGER ( they are contained in Fortran integer
>>    category).
>>
>>    (*) Predefined datatypes such as MPI_WCHAR or MPI_PACKED are useless in
>>        MPI_Fetch_and_op.
>>
>>    Additionally, on   Page 430, Line 39:
>>                   predefined datatypes
>>    should be replaced by
>>                   basic datatypes
>>    since Section 5.9.2 defines the  MPI basic datatypes and not the
>>    predefined
>>    datatypes (which are defined in Tables 3.x).
>>
>>    Hubert
>
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-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
http://www.linkedin.com/in/jeffhammond
https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond