In R how to control multi-threading in BLAS parallel matrix product

Question

I have a question regarding the use of BLAS parallelized matrix product in R (being the default matrix product at least since R-3.4, maybe earlier).

The default beha

Answer 1

The package RhpcBLASctl does just that.

From its DESCRIPTION:

Control the number of threads on 'BLAS' (Aka 'GotoBLAS', 'ACML' and 'MKL'). and possible to control the number of threads in 'OpenMP'. get a number of logical cores and physical cores if feasible.

We mention it in the CRAN Task View on HPC.