I am not really sure the current state of things, but to "get real" I feel any GC needs to be able to handle:

- multicore/multithreaded - heap sizes of 20-200GB and larger ideally

Think about it this way... We have the same goal, of diminishing the use of manually allocated ram to the smallest possible place. Think of the GC vs malloc as compilers vs assembly language. Assembly has it's place, but it's no longer because compilers cannot generate efficient object code in a vast number of circumstances. Lets do the same for GC!