This is a copy of my SO post that was closed as off-topic because it was asking for a software recommendation. I only hope it wouldn't get closed at Software Recommendations SE for being a copy of the above SO post...
I'm looking for an R optimization package that is:
Capable of non-linear global optimization with linear constraints for a non-linear function of 20-ish variables.
Scalable to a cluster.
I know from answers to similar questions that non-linear optimization packages for R are available; I don't know which ones are scalable.
Could you recommend one?