R build processes use all the available cores

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One participant

Ludovic Courtès wrote 1 years ago

Recipients:(address . bug-guix@gnu.org)

Message-ID:878r8ougyf.fsf@inria.fr

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:

Toggle snippet (6 lines)

<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)

Maybe we should set that ‘Ncpus’ option to what ‘parallel-job-count’

returns?

Ludo’.

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