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Subject: Re: [OMPI devel] RFC: add support for large counts using derived datatypes
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2013-07-16 17:07:21

On Jul 16, 2013, at 5:03 PM, George Bosilca <bosilca_at_[hidden]> 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.

Jeff Squyres
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