Azul's garbage collector is patented and until recently required specialized hardware: http://www.azulsystems.com/products/vega/processor http://www.azulsystems

Azul's garbage collector is patented and until recently required specialized hardware: http://www.azulsystems.com/products/vega/processor http://www.azulsystems.com/products/vega/processor Recent advances in Intel CPUs have allowed them to run on commodity hardware, but last I looked, it still required a custom kernel module.