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Re: gfortran vs ifort
On Wed, May 27, 2009 at 07:33:42PM +0530, Girish Kulkarni wrote:
> Hi Paul,
>
> On Fri, 22 May 2009, Paul Richard Thomas wrote:
> >Without knowing which version of gfortran, which compiler flags you
> >are using nor some indication of what your code contains there is no
> >way in which we can answer your questions.
>
> I use gfortran 4.1.2 on an Intel Xeon 5260 machine and the ifort I
> wrote about was 10.1. Factor of five enhancement was with default
> compiler options.
>
(snip)
> Although factor of two is far better than five I am now trying to
> understand if I could modify the code and/or use smarter compiler
> flags and improve. A lesson learnt nonetheless!
4.1.2 is too old. Get 4.4.0 and see if the factor of 2 gap
is reduced.
--
Steve