On Jul 16, 2013, at 23:07 , "Jeff Squyres (jsquyres)" <[email protected]> 
wrote:

> On Jul 16, 2013, at 5:03 PM, George Bosilca <[email protected]> wrote:
> 
>>> Yes, it can -- it has to be the largest integer type (i.e., it even has to 
>>> be able to handle an MPI_Offset).
>> 
>> Technicalities! In the entire standard MPI_Offset is only used to access 
>> files, not to build datatypes. As such there is no way to have the extent of 
>> an datatype bigger than MPI_Aint.
> 
> Datatypes are used in FILE_SET_VIEW.

Doesn't matter. There you don't create a datatype, you force one on the view 
you have of the file. I guess the forum was a little overzealous …

  George.


> 
> -- 
> Jeff Squyres
> [email protected]
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