Newsgroups: comp.parallel.mpi
From: A Gordon Smith <smith>
Subject: Re: real*4, T3D, MPI_REAL
Organization: Department of Computer Science, Edinburgh University
Date: Wed, 11 Oct 1995 12:34:20 GMT
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <DGAAxA.Auq.0.staffin.dcs.ed.ac.uk@dcs.ed.ac.uk>

impellus@ames.ucsd.edu (Tom Impelluso) wrote:

>Hi, on the Cray T3D, I am using real*4 to ensure ieee 32 bit floats.
>Now I must decide if I pass things as MPI_REAL or MPI_DOUBLE_PRECISION.
>
>But first, I must find out if MPI_REAL is 32 or 64 bit *IF*
>I have overridden the default with real*4
>
>
>Please let me know.
>
>Thanks

The MPI standard provides an optional basic datatype MPI_REAL4
to match the REAL*4 Fortran type; see top of p.19 of the 12/June/95
MPI Standard. This has been implemented in the CRI/EPCC MPI for
Cray T3D software.

-- 
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 -=-=- A. Gordon Smith -=- Edinburgh Parallel Computing Centre -=-=-
 =-= Email <smith@epcc.ed.ac.uk> -=- Phone {+44 (0)131 650 6712} =-=
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


