Hi! I noticed on guix.bordeaux.inria.fr, which builds guix-cran, that R build processes would unconditionally use all the available cores (specifically, launching one R process per core), ignoring the value of ‘parallel-job-count’.
I believe all r-* packages are affected. On IRC, Ricardo wrote: --8<---------------cut here---------------start------------->8--- <rekado> the build system uses R CMD INSTALL, which in turn uses install.packages(); that procedure takes an argument Ncpus, which by default is whatever getOption("Ncpus") returns (or 1). [16:16] <rekado> that’s used as an argument to ‘make‘ (if it needs to be called) --8<---------------cut here---------------end--------------->8--- Maybe we should set that ‘Ncpus’ option to what ‘parallel-job-count’ returns? Ludo’.