[R-pkg-devel] callr and CRAN policy on the max number of cores

[Shu Fai Cheung]

Hil,

I am exploring the use of callr in a package. I know that for packages
that do parallel computing, we should not use more than two cores in
examples, tests, etc. when being checked on CRAN.

I believe I can use callr in tests and examples. How should I use
callr in compliance with CRAN policy? Because even just one call to
callr will start a new R session, should I limit the use of callr such
that at any one time, only one background R session created by callr
is active?

Regards,
Shu Fai