[R-SIG-Mac] BLAS benchmarks on R 2.12.0

Simon Urbanek simon.urbanek at r-project.org
Wed Nov 3 17:29:34 CET 2010

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.


> On Wed, Nov 3, 2010 at 6:31 AM, Simon Urbanek
> <simon.urbanek at 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.
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