What does the startup parameter documentation have to do with "monitoring r-code activity"?
When I hear "monitoring r-code activity" I think of the profiler. Line by line execution statistics. How often each line of code was run and how long it took.
Or, perhaps, a subset of that data: what procedures were called.
Or, maybe, something about how much memory a bit of r-code consumes.
Possibly some information about dynamic objects created and deleted at runtime by your code?