[R] Profiler for R ?

[Ralf B]

Hi,

is there such a thing as a profiler for R that informs about a) how
much processing time is used by particular functions and commands and
b) how much memory is used for creating how many objects (or types of
data structures)? In a way I am looking for something similar to the
java profiler (which is started by command line and provides profiling
information collected from the run of a particular program). Is there
such a tool through the R command line or RGUI ? Are there profilers
available for the Eclipse StatET or though another package or
extension?

Thanks,
Ralf