On 05/03/2013 01:45, Benjamin Tyner wrote:> Hi
>
> I've got two builds of R, one using g77 (version 3.4.6) and the other
> using gfortran (version 4.1.2). The two builds are otherwise identical
> as far as I can tell. The one which used g77 performs crossprod()s
> roughly twice as fast as the gfortran one. I'm wondering if this rings
a
> bell with anyone, and if so, are you aware of any configure settings
> which will improve the performance when using gfortran. This is on RHEL 5.
Note that recent versions of R do not build with g77, and have
performance improvements in linear algebra. So please follow the
posting guide and give up the 'at a minimum' information requested and a
reproducible example.
Also, check what BLAS is in use: an optimized BLAS can make a lot of
difference on such simple operations.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595