JVM stops at 2GB under windows Server 2008 R2

Question

I have a problem with a java application. Using a 64bit JVM (1.60.0_20) under windows server 2008 r2 (64bit), the application hangs at 2GB allocated memory, it will not go beyond that mark even after changing the JVM settings to allocate more (-Xmx5000m) and waiting for more than 12 hours. This is on an EC2 instance with 7.5GB available memory.

Answer 1

Hangs? Not throws 'OutOfMemoryError'? What happens if you start out with the heap at 2GB ("-Xms2g -Xmx2g"), can you start the app?

I wonder if you are running up against the memory available to your instance. Is it a small instance? It will start thrashing, due to swap, as the amount of memory in use well exceeds the physical memory available. Maybe you need a large-memory instance instead.