Relative Performance of Java's Garbage First (G1) Garbage Collector?

Question

Does anyone know of any performance benchmarks of Java\'s new Garbage First (G1) Garbage Collector (as compared to the \"old\" GCs)?

In terms of GC pause times, Sun sta

Answer 1

We have just finished a series of testing over CMS and G1, using comparable ergonomics. This is product specific and very subjective, AND we're using Java 6 (so G1 is in the "preview" build) but...

A system using CMS is 20% faster than G1. This was tested with 8GB and 12GB heap space, with 1GB and 1.5GB young space (respectively).

Again - subjective, single system, specific load - but that's our experience.