[Mpi3-bwcompat] MPI Backward Compatibility Working Group

[Jeff Squyres]

On Mar 11, 2011, at 6:06 PM, Solt, David George wrote:

> 2.5.8 Last sentence change to:
>  
> The size of the MPI_Count type is determined by the MPI implementation
> with the restriction that it must be minimally capable of encoding a C int and Fortran INTEGER
> and any value that may be stored in an MPI_Aint type.

"...and any value that may be stored in a variable of type MPI_Aint."

> Rational thingy:

Rationale.  Potatoes.  :-)

> MPI_Count is used to communicate both the number of elements in a datatype and the bounds of a datatype.
> The number of elements in a datatype is specified at creation time using a C int or Fortran INTEGER.   The bounds
> may be specified using an MPI_Aint. 

This is good.  I would change the wording slightly -- let's not use the verb "communicate" here:

"MPI_Count explicitly specifies the number of elements in a datatype, and therefore implicitly specifies the bounds of that datatype.  The number of elements in a datatype is specified at creation time using a C int or Fortran INTEGER.  The extent of a datatype is expressed using an MPI_Aint.

How's that?


-- 
Jeff Squyres
jsquyres_at_[hidden]
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