I appreciate your replies but my question has to do with the function MPI_Allreduce of OpenMPI built on a Mac OSX 10.6 with ifort (intel fortran compiler). -- Hugo Gagnon
On Tue, 27 Jul 2010 13:23 +0100, "Anton Shterenlikht" <me...@bristol.ac.uk> wrote: > On Tue, Jul 27, 2010 at 08:11:39AM -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 > > http://gcc.gnu.org/onlinedocs/gcc-3.4.6/g77/Kind-Notation.html, kind(2) is > > double precision (but that's for a different compiler, and I don't quite > > grok the ".d0" notation). > > *quote* > kind (x) has type default integer and value equal to the kind > type parameter value of x. > *end quote* > > p. 161 from Metcalf et al (2007) Fortran 95/2003 explained. > > % cat tmp.f90 > program z > > integer, parameter :: dp = kind(1.d0) > real(kind=dp) :: inside(5), outside(5) > > write(*,*)dp > > end program z > % g95 -L/usr/local/lib tmp.f90 > % ./a.out > 8 > % > > Kind 8 is (on most arch) 8-byte real, i.e. typically > double precision. > > -- > Anton Shterenlikht > Room 2.6, Queen's Building > Mech Eng Dept > Bristol University > University Walk, Bristol BS8 1TR, UK > Tel: +44 (0)117 331 5944 > Fax: +44 (0)117 929 4423 > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > -- Hugo Gagnon
