Zing does not do you any good if you are selling software. Your income is reduced by the license cost of Zing in addition to the additional sales and deployment friction.

The reality is that you have to build software that works on the Oracle JVM.

ah, understood. have you been tracking shenandoah? http://openjdk.java.net/jeps/189

I have heard of it but haven't read up. I think it's great that someone is stepping up to address the issue. Interesting that both the authors listed in the JEP work for Red Hat.

Shenandoah is unlikely to see the light of production release until Java 10. I ran a very early piece on this - http://www.jclarity.com/2014/03/12/shenandoah-experiment-1-w... - really glad to see more experiments in this space. I'll add that G1 from Java 8u5 onwards is pretty darn good out of the box.

If Zing performs as well as you say, why have neither Google nor Oracle purchased it? I imagine that even Microsoft would be interested because they could try adapting it to .NET.

It seems that they published a description of how their algorithm works: http://www.azulsystems.com/sites/default/files/images/c4_pap... My cursory read of the paper suggests that it increases memory requirements by a factor of 100 over the working set and if it cannot get that much memory, the garbage collection will run slower than a standard garbage collector.