Paulo Pinto:
Java Azul VM GC was already handling 1 TB in 2010.
http://qconsf.com/sf2010/dl/qcon-sanfran-2010/slides/GilTene_GCNirvanaHighThroughputAndLowLatencyTogether.pdf
GC is not the only way of doing automatic memory management, but
this ongoing discussion steams more from D's current GC status
and respective phobia in C world, and less from what a modern GC
is capable of.
On the other hand I don't think you will have available in the D
world the amount of work done on the Azul GC. This is the problem
with looking at Java.
Bye,
bearophile