[Rd] boneheaded BLAS questions

[Dirk Eddelbuettel]

On 18 March 2021 at 09:15, Tomas Kalibera wrote:
| This is documented in R Admin manual, section A.3, and there is also 
| "configure --help".
| 
| On my Ubuntu 20.04, using "--with-blas --with-lapack" when a BLAS/LAPACK 
| implementation is installed via "apt" works for me:
| 
| with libblas3, liblapack3 I get in R via sessionInfo()
| 
| BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.9.0
| LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.9.0
| 
| then I install libopenblas0 and get, after re-starting R (not rebuilding):
| 
| BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
| LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/liblapack.so.3

Yes, thank you, that is exactly what I use and recommend too. And ...

On 18 March 2021 at 09:34, Tomas Kalibera wrote:
| and to install say MKL, this works for me:
| 
| apt-get install intel-mkl-full
| 
| and then:
| 
| env MKL_INTERFACE_LAYER=GNU,LP64 MKL_THREADING_LAYER=GNU R
| 
| gives me:
| 
| BLAS/LAPACK: /usr/lib/x86_64-linux-gnu/libmkl_rt.so
| 
| This is following documentation in A.3.1.3 of R Admin manual.

... which is what the (surprisingly popular, 139 stars) simple two-year old
script at GitHub has been automated.

   https://github.com/eddelbuettel/mkl4deb

I may need to update the recommendation for the two MKL_* variables.

Dirk

-- 
https://dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org