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Subject: Re: [OMPI devel] RFC: add support for large counts using derived datatypes
From: George Bosilca (bosilca_at_[hidden])
Date: 2013-07-16 16:48:12

It's a typo, MPI_Aint is of course unsigned.


On Jul 16, 2013, at 22:37 , David Goodell (dgoodell) <dgoodell_at_[hidden]> wrote:

> On Jul 16, 2013, at 3:22 PM, George Bosilca <bosilca_at_[hidden]> wrote:
>> I read your code and it's definitively looking good. I have however few minor issues with your patch.
>> 1. MPI_Aint is unsigned as it must represent the difference between two memory arbitrary locations. In your MPI_Type_get_[true_]extent_x you go through size_t possibly reducing it's extent. I would suggest you used ssize_t instead.
> MPI_Aint must be signed for Fortran compatibility (among other reasons). If OMPI's MPI_Aint is unsigned then that's a bug in OMPI.
> -Dave
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