Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

Subject: Re: [OMPI users] MPI_Allreduce on local machine
From: Terry Frankcombe (terry_at_[hidden])
Date: 2010-07-27 08:17:44

On Tue, 2010-07-27 at 08:11 -0400, Jeff Squyres wrote:
> On Jul 26, 2010, at 11:06 PM, Hugo Gagnon wrote:
> > 8 integer, parameter :: dp = kind(1.d0)
> > 9 real(kind=dp) :: inside(5), outside(5)
> I'm not a fortran expert -- is kind(1.d0) really double precision? According to, kind(2) is double precision (but that's for a different compiler, and I don't quite grok the ".d0" notation).

Urgh! Thank heavens gcc have moved away from that stupid idea.

kind=8 is normally double precision (and is with gfortran). kind(1.0d0)
is always double precision.

The d (as opposed to e) means DP.