First, the response time variation is an important observation, thanks for that. To make sure, that it is caused by V8's CG, we need a GC log from the benchmark

First, the response time variation is an important observation, thanks for that. To make sure, that it is caused by V8's CG, we need a GC log from the benchmark. Second to make this a fair comparison, you need to use a similar sized heap. It could be, that the JVM heap was large enough to run the whole test without a major CG. We need a GC log also for this part of the test. Sun was aware of the different CG strategies needed for server and client use and let us choose between them. V8 however seems the be optimized for the client side.