JVM garbage collection and a paging memory architecture

Question

In the recent 10 year when discussing java and/or garbage collection, the only performance penalty that I have not been able to defend is that garbage collection algorithms more

Answer 1

You are correct, the garbage collector and the virtual memory manager have to collaborate otherwise the GC will trash the system. Such a GC/kernel collaboration has been investigated by Matthew Hertz, Yi Feng and Emery D. Berger. In order to obtain good performance, they had to extend the kernel slightly and also tweak the garbage collector.

Under high memory pressure, their benchmark took something like 160x longer using the GenMS Java GC. With the new, page-aware GC, the benchmark was only 1.6 times slower. In other words, with a properly tuned GC, there is a 100x performance gain.

http://lambda-the-ultimate.org/node/2391