On Nov 3, 2010, at 4:49 PM, Michael Spiegel wrote: > Thank you, I can run off and do some more tests with this information. I > think the culprit on my development machine is that Xcode needs to be > upgraded and then I can use -mtune=core2.
That alone could explain you performance issue since you gcc is apparently way too old - possibly nothing to do with flags but just gcc capabilities. > I have one small follow-up question. I thought the compilation flags for > building src/extra/blas had changed from version 2.12.0 to 2.11.1. But you > suggest maybe they haven't changed? > I did not change anything as far as the configure flags go. Cheers, Simon > On Wed, Nov 3, 2010 at 6:31 AM, Simon Urbanek > <simon.urba...@r-project.org> wrote: >> >> The current build flags for i386 are listed in >> https://svn.r-project.org/R-dev-web/trunk/QA/Simon/R-build/conf.leopard-i386 >> >> They did not change recently so they were the same for 2.11.1. The compiler >> used is gcc-4.2 from Xcode 3.1.4 (R is built on OS X 10.5.8) with the >> corresponding Fortran form the tools page. >> > >> To get back to your problem - did you try the single threaded ATLAS for your >> problem? > > I did try ATLAS and did not see performance improvements. But that > attempt was without -mtune=core2. > > _______________________________________________ > R-SIG-Mac mailing list > R-SIG-Mac@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-mac > > _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-mac
