[R] auditing R's memory usage

[Alexander Shenkin]

Hi Folks,

I'm running 32-bit R 2.14 in RStudio on my Win 7 x64 system with 8GB
RAM.  I'm getting memory problems as R wants to swallow more than the
4GB limit.

I think I'm stuck at 4GB as I have to use 32-bit R for a number of
packages (ODBC, etc).  However, I doubt I really need to be using that
much memory - I'm probably being very sloppy in my memory management,
leaving lots of temporary dataframes around, etc.

I'm looking for suggestions about how to audit R's memory usage.  Yes, I
could go around my code and tie up every loose end.  But in the interest
of efficiency, I'm wondering about ways I might more intelligently audit
R's memory usage.  Are there any tools that can tell me what objects are
swallowing what amounts of memory?  Armed with that information, I can
go track down the worst culprits.

Thanks,
Allie