[mpich2-dev] MPI_CHAR vs. MPI_SIGNED_CHAR in reductions

[William Gropp]

Yes, this is a bug based on the MPI-1 reading (where there was no  
SIGNED_CHAR).

Bill

On Apr 2, 2008, at 11:45 AM, David Gingold wrote:

> MPICH2 folks --
>
> My MPI book says that MPI_SIGNED_CHAR is a valid datatype for the  
> arithmetic reduction operations, and that MPI_CHAR is not.
>
> The MPICH2 code, e.g. in opmax.c, seems to allow MPI_CHAR but not  
> MPI_SIGNED_CHAR for these operations.
>
> Is this a bug in the code?
>
> -dg
>
> --
> David Gingold
> Principal Software Engineer
> SiCortex
> Three Clock Tower Place, Suite 210
> Maynard MA 01754
> (978) 897-0214 x224
>
>
>

William Gropp
Paul and Cynthia Saylor Professor of Computer Science
University of Illinois Urbana-Champaign


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