R SIG Debian - Jul 2017 - Using Openblas with R in Reproducible R container

Good morning
Since im using R for a reproducible scientific machine learing &
hyperparamter optimizations i stumble upon the fact that other
implementations of blas such openblas/atlas/klm can speedup this costly
 optimizarion but results  are slightly different using each each blas even
if optimization is forced on single thread results deviate from default R.
So since im using docker to contain the experiment is good to:
1.compile from source instead of binaries.
2.if i compile from source using default will lead to same configuration as
debian binaries.
3.since results are different for each blas which blas i have to
use..theres a something called reproblas from Berkley  is it good idea to
use it with R.
4.when you compile R using "--with-blas=-lopenblas" in this case
openblas
is single threaded or multithreaded?

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