Newsgroups: comp.parallel.mpi
From: lfm@pgroup.com (Larry Meadows)
Subject: Re: real*4, T3D, MPI_REAL
Organization: The Portland Group, Inc.
Date: 12 Oct 1995 13:42:23 -0700
Message-ID: <45jujf$94r@indy.pgroup.com>

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



>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

I'm pretty sure real*4 is still 64-bits using cf77 on the t3d. However,
float in C is 32-bits. You can get 32 bits in fortran with cf90.

Correct me if I'm wrong.

lfm

