[R-SIG-Mac] disabling threads when using Accelerate BLAS
Kasper Daniel Hansen
k@@perd@nielh@n@en @ending from gm@il@com
Sun Sep 9 16:53:26 CEST 2018
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>
> 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
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