A simple “Hello World” needs 10G virtual memory on a 64-bit machine vs 1G at 32-bit?

Question

Running a simple Java program on our production machine, I noticed that this program eats up more 10G virt. I know that virtual memory is not that relevant, but at least I would

Answer 1

This is not the amount of physical memory the application is actually using. A virtual memory used by all processes can be orders of magnitude more than the amount of physical RAM on the machine, without any obvious problems.