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

[Kasper Daniel Hansen]

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)

Best,
Kasper

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