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, rip...@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
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