[Mpi-forum] MPI Count proposal from today's meeting

[Jeff Squyres]

On Jun 16, 2010, at 2:16 PM, N.M. Maclaren wrote:

> I hope nobody is insane enough to define it as a 64-bit integer in ANY
> implementation.  The alternative to 'int' should be the integer suitable
> for array indexing, which might be of any size from 16 bits (due to MPI
> tag and other constraints) upwards.  This is not just a nit-pick.


Can you explain why?

I ask because the primary purpose for "count" arguments is not for array indexing.  One of the use cases that users have asked for is to be able to send more than 2B elements without needing to build a datatype.

-- 
Jeff Squyres
jsquyres at cisco.com
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