[Rcpp-devel] RcppArmadillo BLAS/LAPACK force number of threads to 1

[Scott Ritchie]

Hi Everyone,

I'm having trouble with restricting the Armadillo function "svd_econ" to
run on a single thread.

I am able to restrict it if I `export OPENBLAS_NUM_THREADS=1` before
opening an R session, but not from within R
(`Sys.setenv(OPENBLAS_NUM_THREADS=1)` has no effect).

I'm wondering if theirs an option native to armadillo/RcppArmadillo that
I'm missing to enable me to:

   - Restrict the number of threads used to 1
   - In a library agnostic manner (i.e. if the user has a different LAPACK
   or BLAS library installed).

or if I can "trick" Rcpp into thinking the machine only has 1 core?

Regards,

Scott Ritchie
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