Let's all just agree to use Perl. It's just dynamic, functional, OOPy C isn't it?
J/K. I think this is an interesting problem in that its a sandbox for allocation and GC in pretty much any dynamic interpreter's implementation. My qualm is that it would be "easy" to tune for the test. Consider the difference between dynamic blocks of a small but fixed size, getting alloc'd/freed in an asynchronous way (a network stack?) versus a pool of variable byte length strings getting shuffled around (a key/value store?). Those are simple, but drastically different, strategies for your heap. There won't be a "best" answer besides the limits of your problem domain.