[Mpi3-bwcompat] MPI_Count mixing with int...

[Fab Tillier]

Quincey Koziol wrote on Thu, 8 Jul 2010 at 06:44:37

> 
> On Jul 7, 2010, at 8:16 AM, Rajeev Thakur wrote:
> 
>> Can we define both (to be the same) since we are familiar with count
>> for messages (it is a count of datatypes) and size for others.
> 
> 	I agree - we shouldn't conflate counts and sizes, they are
> totally different things.  Defining them both makes sense to me.

But they are the same for the MPI_PACKED datatype, so really shouldn't be different.

As an aside, can count ever be larger than size_t?

-Fab

>>> -----Original Message----- From: mpi3-bwcompat-bounces_at_[hidden]
>>> [mailto:mpi3-bwcompat-bounces_at_[hidden]] On Behalf Of Jeff Squyres
>>> Sent: Wednesday, July 07, 2010 7:24 AM To: MPI-3 backwards
>>> compatability WG Subject: Re: [Mpi3-bwcompat] MPI_Count mixing with
>>> int...
>>> 
>>> On Jul 7, 2010, at 2:23 AM, Fab Tillier wrote:
>>> 
>>>> Would anyone object if we defined MPI_Size rather than
>>> MPI_Count, and used it for count, position, and size
>>> parameters?  We could then tackle the issues with
>>> MPI_Pack/Unpack/Pack_size/Type_size at the same time as
>>> counts.  We can't use MPI_Aint here since we want to be able
>>> to be backward compatible, so must provide a separate type
>>> that can be defined as a standard integer.
>>> 
>>> I agree that tackling them all at the same time is the Right
>>> Thing to do.  I also agree with all your other points.
>>> 
>>> I still am a little uncomfortable with the name "MPI_Size"
>>> because sizes and counts are theoretically different things.
>>> But then again, I can't think of a better name offhand...
>>> 
>>> --
>>> Jeff Squyres
>>> jsquyres_at_[hidden]
>>> For corporate legal information go to:
>>> http://www.cisco.com/web/about/doing_business/legal/cri/
>>> 
>>> 
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>> 
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