[Rd] crossprod(): g77 versus gfortran

Benjamin Tyner btyner at gmail.com
Tue Mar 5 02:45:20 CET 2013


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.


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