On Mar 5, 2013, at 10:38 PM, Benjamin Tyner wrote: > Thank you Brian. So it sounds like appendix B.6 of > > http://cran.r-project.org/doc/manuals/R-admin.html > > should be updated to reflect that g77 is no longer supported; I will > notify c...@r-project.org of this unless you suggest a different recipient. >
I think you misunderstood - you can use g77 but you will also need F90-capable Fortran - typically gfortran - unless you have other source for LAPACK and that's what B.6 says explicitly. Cheers, Simon > In any case, I tried again but using gfortran version 4.4.0, and now the > timings are back to what they were under g77. > > As for BLAS, was using the one that ships with R, as wanted to keep > things simple for benchmarking purposes. > > Thanks again. > >> 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 >> <https://stat.ethz.ch/mailman/listinfo/r-devel> >> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ >> <http://www.stats.ox.ac.uk/%7Eripley/> >> University of Oxford, Tel: +44 1865 272861 (self) >> 1 South Parks Road, +44 1865 272866 (PA) >> Oxford OX1 3TG, UK Fax: +44 1865 272595 > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
