[Mpi-22] [Mpi-forum] Call for MPI 2.2 agenda items

[George Bosilca]

I would like to propose an extension to the collective operators to  
allow them to be applied on non contiguous types, if and only if these  
types are composed by a single predefined type. The original matching  
rules (which operator support a specific predefined type) will  
continue to apply.

As an example, this will allow users to apply a reduction operation on  
a trapezoidal matrix without having to define their own operator. As a  
result the reduction operation can benefit from all internal  
optimizations (such as pipelining) that usually are allowed only on  
contiguous types.

   george.

On May 13, 2008, at 8:54 AM, Jesper Larsson Traeff wrote:

>
> Here are some items that are perhaps suitable for MPI-2.2
>
> * MPI_Reduce_scatter_block
>
> * (possibly) built-in segmented Scan operations (new binary operators)
>
> * Correction/clarification to semantics of one-sided synchronization
>  when switching between modes (NOTE: the proposal I posted some months
>  back is deficient, as Rolf pointed out to me, and will have to be  
> modified)
>
> I will try to make final proposals before the next meeting
>
> Jesper
>
> On Mon, May 05, 2008 at 03:36:01PM -0500, Rajeev Thakur wrote:
>> Now that MPI 2.1 is close to completion, it is time to look at  
>> issues for
>> MPI 2.2. Please send any items you may have for 2.2 to
>> mpi-22_at_[hidden] and/or upload them to the wiki (and let  
>> us know).
>> I had made a note of the following items from the last meeting that  
>> were
>> deferred to 2.2:
>>
>> * support for long long in maxloc, minloc
>>
>> * fix meaning of first two sentences in intercommunicator barrier
>>
>> * Ex 5.8 uses old style MPI_UB
>>
>> * Many functions say "integer" instead of "nonnegative integer"
>>
>> * const in C++ bindings
>>
>> * IN, OUT, and INOUT handle types broken
>>
>> * MPI_CHAR, MPI::CHAR should be signed char or char?
>>
>> * Need 64-bit sizes for count in messages
>>
>> * Sizes of MPI_Aint and MPI_Offset should not be different
>>
>> * New predefined types MPI_AINT and MPI_OFFSET
>>
>> * New predefined types corresponding to new types in C99, Fortran  
>> 2003, and
>> C++ some year
>>
>>
>>
>>
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