Github user redbaron commented on the pull request:
https://github.com/apache/spark/pull/5096#issuecomment-85612736
@oscaroboto, @davies I am working on integrating sparkR into our workflow +
integrating it with packrat.
To make things smooth, I had to drop custom .Rprofile which sets necessary
options to limit CPU and RAM (drop Rscript override into /usr/local/bin which
call real Rscript but ignoring any --vanilla option passed sparkR, otherwise
your custom .Rprofile won't be loaded).
Unfortunately there is no standard way for R to limit CPUs as any library
can use multithreading as it pleases. Currently I set mc.cores for mcapply and
OMP_NUM_THREADS for OpenBLAS to match executor cores.
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