[R-SIG-Mac] disabling threads when using Accelerate BLAS

[Kasper Daniel Hansen]

Thanks for the extremely helpful pointers on this.  Clearly I need to
remove --with-lapack in my configure step.

On Sun, Sep 9, 2018 at 4:12 AM Prof Brian Ripley <ripley using stats.ox.ac.uk>
wrote:

> On 08/09/2018 22:01, Kasper Daniel Hansen wrote:
> > For timing purposes, is it possible to control the number of threads /
> > cores when I have compiled R to use the BLAS in the Accelerate framework
> > (by building R using
> >    ./configure --with-blas="-framework Accelerate" --with-lapack
> > )
> >
> > ? (The alternative is of course to build R using the supplied
> > single-threaded BLAS)
>
> This is a question about Accelerate not R.  But the R-admin manual does say
>
> 'In recent versions of macOS, threading in Accelerate is controlled by
> ‘Grand Central Dispatch’ and is said not to need user control.'
>
> It has quite a few other caveats about Accelerate, not least that it
> uses an LAPACK which is missing many bug fixes, some serious.
>
> --
> Brian D. Ripley,                  ripley using stats.ox.ac.uk
> Emeritus Professor of Applied Statistics, University of Oxford
>

	[[alternative HTML version deleted]]